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SPIRV-Tools/source/opt/aggressive_dead_code_elim_pass.cpp

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Add AggressiveDCEPass Create aggressive dead code elimination pass This pass eliminates unused code from functions. In addition, it detects and eliminates code which may have spurious uses but which do not contribute to the output of the function. The most common cause of such code sequences is summations in loops whose result is no longer used due to dead code elimination. This optimization has additional compile time cost over standard dead code elimination. This pass only processes entry point functions. It also only processes shaders with logical addressing. It currently will not process functions with function calls. It currently only supports the GLSL.std.450 extended instruction set. It currently does not support any extensions. This pass will be made more effective by first running passes that remove dead control flow and inlines function calls. This pass can be especially useful after running Local Access Chain Conversion, which tends to cause cycles of dead code to be left after Store/Load elimination passes are completed. These cycles cannot be eliminated with standard dead code elimination. Additionally: This transform uses a whitelist of instructions that it knows do have side effects, (a.k.a. combinators). It assumes other instructions have side effects: it will not remove them, and assumes they have side effects via their ID operands.
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// Copyright (c) 2017 The Khronos Group Inc.
// Copyright (c) 2017 Valve Corporation
// Copyright (c) 2017 LunarG Inc.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
#include "aggressive_dead_code_elim_pass.h"
ADCE: Dead if elimination Mark structured conditional branches live only if one or more instructions in their associated construct is marked live. After closure, replace dead structured conditional branches with a branch to its merge and remove dead blocks. ADCE: Dead If Elim: Remove duplicate StructuredOrder code Also generalize ComputeStructuredOrder so that the caller can specify the root block for the order. Phi insertion uses pseudo_entry_block and adce and dead branch elim use the first block of the function. ADCE: Dead If Elim: Pull redundant code out of InsertPhiInstructions ADCE: Dead If Elim: Encapsulate CFG Cleanup Initialization ADCE: Dead If Elim: Remove redundant code from ADCE initialization ADCE: Dead If: Use CFGCleanup to eliminate newly dead blocks Moved bulk of CFG Cleanup code into MemPass.
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#include "cfa.h"
Add AggressiveDCEPass Create aggressive dead code elimination pass This pass eliminates unused code from functions. In addition, it detects and eliminates code which may have spurious uses but which do not contribute to the output of the function. The most common cause of such code sequences is summations in loops whose result is no longer used due to dead code elimination. This optimization has additional compile time cost over standard dead code elimination. This pass only processes entry point functions. It also only processes shaders with logical addressing. It currently will not process functions with function calls. It currently only supports the GLSL.std.450 extended instruction set. It currently does not support any extensions. This pass will be made more effective by first running passes that remove dead control flow and inlines function calls. This pass can be especially useful after running Local Access Chain Conversion, which tends to cause cycles of dead code to be left after Store/Load elimination passes are completed. These cycles cannot be eliminated with standard dead code elimination. Additionally: This transform uses a whitelist of instructions that it knows do have side effects, (a.k.a. combinators). It assumes other instructions have side effects: it will not remove them, and assumes they have side effects via their ID operands.
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#include "iterator.h"
#include "spirv/1.0/GLSL.std.450.h"
ADCE: Dead if elimination Mark structured conditional branches live only if one or more instructions in their associated construct is marked live. After closure, replace dead structured conditional branches with a branch to its merge and remove dead blocks. ADCE: Dead If Elim: Remove duplicate StructuredOrder code Also generalize ComputeStructuredOrder so that the caller can specify the root block for the order. Phi insertion uses pseudo_entry_block and adce and dead branch elim use the first block of the function. ADCE: Dead If Elim: Pull redundant code out of InsertPhiInstructions ADCE: Dead If Elim: Encapsulate CFG Cleanup Initialization ADCE: Dead If Elim: Remove redundant code from ADCE initialization ADCE: Dead If: Use CFGCleanup to eliminate newly dead blocks Moved bulk of CFG Cleanup code into MemPass.
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#include <stack>
Add AggressiveDCEPass Create aggressive dead code elimination pass This pass eliminates unused code from functions. In addition, it detects and eliminates code which may have spurious uses but which do not contribute to the output of the function. The most common cause of such code sequences is summations in loops whose result is no longer used due to dead code elimination. This optimization has additional compile time cost over standard dead code elimination. This pass only processes entry point functions. It also only processes shaders with logical addressing. It currently will not process functions with function calls. It currently only supports the GLSL.std.450 extended instruction set. It currently does not support any extensions. This pass will be made more effective by first running passes that remove dead control flow and inlines function calls. This pass can be especially useful after running Local Access Chain Conversion, which tends to cause cycles of dead code to be left after Store/Load elimination passes are completed. These cycles cannot be eliminated with standard dead code elimination. Additionally: This transform uses a whitelist of instructions that it knows do have side effects, (a.k.a. combinators). It assumes other instructions have side effects: it will not remove them, and assumes they have side effects via their ID operands.
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namespace spvtools {
namespace opt {
namespace {
const uint32_t kTypePointerStorageClassInIdx = 0;
const uint32_t kExtInstSetIdInIndx = 0;
const uint32_t kExtInstInstructionInIndx = 1;
ADCE: Treat privates like locals in entry point with no calls This is needed for ongoing legalization of HLSL. It allows removal of accesses to textures/buffers that are not used.
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const uint32_t kEntryPointFunctionIdInIdx = 1;
ADCE: Dead if elimination Mark structured conditional branches live only if one or more instructions in their associated construct is marked live. After closure, replace dead structured conditional branches with a branch to its merge and remove dead blocks. ADCE: Dead If Elim: Remove duplicate StructuredOrder code Also generalize ComputeStructuredOrder so that the caller can specify the root block for the order. Phi insertion uses pseudo_entry_block and adce and dead branch elim use the first block of the function. ADCE: Dead If Elim: Pull redundant code out of InsertPhiInstructions ADCE: Dead If Elim: Encapsulate CFG Cleanup Initialization ADCE: Dead If Elim: Remove redundant code from ADCE initialization ADCE: Dead If: Use CFGCleanup to eliminate newly dead blocks Moved bulk of CFG Cleanup code into MemPass.
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const uint32_t kSelectionMergeMergeBlockIdInIdx = 0;
const uint32_t kLoopMergeMergeBlockIdInIdx = 0;
Add AggressiveDCEPass Create aggressive dead code elimination pass This pass eliminates unused code from functions. In addition, it detects and eliminates code which may have spurious uses but which do not contribute to the output of the function. The most common cause of such code sequences is summations in loops whose result is no longer used due to dead code elimination. This optimization has additional compile time cost over standard dead code elimination. This pass only processes entry point functions. It also only processes shaders with logical addressing. It currently will not process functions with function calls. It currently only supports the GLSL.std.450 extended instruction set. It currently does not support any extensions. This pass will be made more effective by first running passes that remove dead control flow and inlines function calls. This pass can be especially useful after running Local Access Chain Conversion, which tends to cause cycles of dead code to be left after Store/Load elimination passes are completed. These cycles cannot be eliminated with standard dead code elimination. Additionally: This transform uses a whitelist of instructions that it knows do have side effects, (a.k.a. combinators). It assumes other instructions have side effects: it will not remove them, and assumes they have side effects via their ID operands.
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} // namespace anonymous
Re-format files in source, source/opt, source/util, source/val and tools. NFC. This just makes sure every file is formatted following the formatting definition in .clang-format. Re-formatted with: $ clang-format -i $(find source tools include -name '*.cpp') $ clang-format -i $(find source tools include -name '*.h')
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bool AggressiveDCEPass::IsVarOfStorage(uint32_t varId, uint32_t storageClass) {
Re-factor Phi insertion code out of LocalMultiStoreElimPass Including a re-factor of common behaviour into class Pass: The following functions are now in class Pass: - IsLoopHeader. - ComputeStructuredOrder - ComputeStructuredSuccessors (annoyingly, I could not re-factor all instances of this function, the copy in common_uniform_elim_pass.cpp is slightly different and fails with the common implementation). - GetPointeeTypeId - TakeNextId - FinalizeNextId - MergeBlockIdIfAny This is a NFC (non-functional change)
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const ir::Instruction* varInst = get_def_use_mgr()->GetDef(varId);
Opt: Have "size" passes process full entry point call tree. Includes code to deal correctly with OpFunctionParameter. This is needed by opaque propagation which may not exhaustively inline entry point functions. Adds ProcessEntryPointCallTree: a method to do work on the functions in the entry point call trees in a deterministic order.
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const SpvOp op = varInst->opcode();
Re-format files in source, source/opt, source/util, source/val and tools. NFC. This just makes sure every file is formatted following the formatting definition in .clang-format. Re-formatted with: $ clang-format -i $(find source tools include -name '*.cpp') $ clang-format -i $(find source tools include -name '*.h')
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if (op != SpvOpVariable) return false;
Add AggressiveDCEPass Create aggressive dead code elimination pass This pass eliminates unused code from functions. In addition, it detects and eliminates code which may have spurious uses but which do not contribute to the output of the function. The most common cause of such code sequences is summations in loops whose result is no longer used due to dead code elimination. This optimization has additional compile time cost over standard dead code elimination. This pass only processes entry point functions. It also only processes shaders with logical addressing. It currently will not process functions with function calls. It currently only supports the GLSL.std.450 extended instruction set. It currently does not support any extensions. This pass will be made more effective by first running passes that remove dead control flow and inlines function calls. This pass can be especially useful after running Local Access Chain Conversion, which tends to cause cycles of dead code to be left after Store/Load elimination passes are completed. These cycles cannot be eliminated with standard dead code elimination. Additionally: This transform uses a whitelist of instructions that it knows do have side effects, (a.k.a. combinators). It assumes other instructions have side effects: it will not remove them, and assumes they have side effects via their ID operands.
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const uint32_t varTypeId = varInst->type_id();
Re-factor Phi insertion code out of LocalMultiStoreElimPass Including a re-factor of common behaviour into class Pass: The following functions are now in class Pass: - IsLoopHeader. - ComputeStructuredOrder - ComputeStructuredSuccessors (annoyingly, I could not re-factor all instances of this function, the copy in common_uniform_elim_pass.cpp is slightly different and fails with the common implementation). - GetPointeeTypeId - TakeNextId - FinalizeNextId - MergeBlockIdIfAny This is a NFC (non-functional change)
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const ir::Instruction* varTypeInst = get_def_use_mgr()->GetDef(varTypeId);
Re-format files in source, source/opt, source/util, source/val and tools. NFC. This just makes sure every file is formatted following the formatting definition in .clang-format. Re-formatted with: $ clang-format -i $(find source tools include -name '*.cpp') $ clang-format -i $(find source tools include -name '*.h')
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if (varTypeInst->opcode() != SpvOpTypePointer) return false;
Add AggressiveDCEPass Create aggressive dead code elimination pass This pass eliminates unused code from functions. In addition, it detects and eliminates code which may have spurious uses but which do not contribute to the output of the function. The most common cause of such code sequences is summations in loops whose result is no longer used due to dead code elimination. This optimization has additional compile time cost over standard dead code elimination. This pass only processes entry point functions. It also only processes shaders with logical addressing. It currently will not process functions with function calls. It currently only supports the GLSL.std.450 extended instruction set. It currently does not support any extensions. This pass will be made more effective by first running passes that remove dead control flow and inlines function calls. This pass can be especially useful after running Local Access Chain Conversion, which tends to cause cycles of dead code to be left after Store/Load elimination passes are completed. These cycles cannot be eliminated with standard dead code elimination. Additionally: This transform uses a whitelist of instructions that it knows do have side effects, (a.k.a. combinators). It assumes other instructions have side effects: it will not remove them, and assumes they have side effects via their ID operands.
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return varTypeInst->GetSingleWordInOperand(kTypePointerStorageClassInIdx) ==
Re-format files in source, source/opt, source/util, source/val and tools. NFC. This just makes sure every file is formatted following the formatting definition in .clang-format. Re-formatted with: $ clang-format -i $(find source tools include -name '*.cpp') $ clang-format -i $(find source tools include -name '*.h')
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storageClass;
ADCE: Treat privates like locals in entry point with no calls This is needed for ongoing legalization of HLSL. It allows removal of accesses to textures/buffers that are not used.
2017-10-10 20:35:53 +00:00
}
bool AggressiveDCEPass::IsLocalVar(uint32_t varId) {
Re-format files in source, source/opt, source/util, source/val and tools. NFC. This just makes sure every file is formatted following the formatting definition in .clang-format. Re-formatted with: $ clang-format -i $(find source tools include -name '*.cpp') $ clang-format -i $(find source tools include -name '*.h')
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return IsVarOfStorage(varId, SpvStorageClassFunction) ||
(IsVarOfStorage(varId, SpvStorageClassPrivate) && private_like_local_);
Add AggressiveDCEPass Create aggressive dead code elimination pass This pass eliminates unused code from functions. In addition, it detects and eliminates code which may have spurious uses but which do not contribute to the output of the function. The most common cause of such code sequences is summations in loops whose result is no longer used due to dead code elimination. This optimization has additional compile time cost over standard dead code elimination. This pass only processes entry point functions. It also only processes shaders with logical addressing. It currently will not process functions with function calls. It currently only supports the GLSL.std.450 extended instruction set. It currently does not support any extensions. This pass will be made more effective by first running passes that remove dead control flow and inlines function calls. This pass can be especially useful after running Local Access Chain Conversion, which tends to cause cycles of dead code to be left after Store/Load elimination passes are completed. These cycles cannot be eliminated with standard dead code elimination. Additionally: This transform uses a whitelist of instructions that it knows do have side effects, (a.k.a. combinators). It assumes other instructions have side effects: it will not remove them, and assumes they have side effects via their ID operands.
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}
void AggressiveDCEPass::AddStores(uint32_t ptrId) {
Re-factor Phi insertion code out of LocalMultiStoreElimPass Including a re-factor of common behaviour into class Pass: The following functions are now in class Pass: - IsLoopHeader. - ComputeStructuredOrder - ComputeStructuredSuccessors (annoyingly, I could not re-factor all instances of this function, the copy in common_uniform_elim_pass.cpp is slightly different and fails with the common implementation). - GetPointeeTypeId - TakeNextId - FinalizeNextId - MergeBlockIdIfAny This is a NFC (non-functional change)
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const analysis::UseList* uses = get_def_use_mgr()->GetUses(ptrId);
Re-format files in source, source/opt, source/util, source/val and tools. NFC. This just makes sure every file is formatted following the formatting definition in .clang-format. Re-formatted with: $ clang-format -i $(find source tools include -name '*.cpp') $ clang-format -i $(find source tools include -name '*.h')
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if (uses == nullptr) return;
Add AggressiveDCEPass Create aggressive dead code elimination pass This pass eliminates unused code from functions. In addition, it detects and eliminates code which may have spurious uses but which do not contribute to the output of the function. The most common cause of such code sequences is summations in loops whose result is no longer used due to dead code elimination. This optimization has additional compile time cost over standard dead code elimination. This pass only processes entry point functions. It also only processes shaders with logical addressing. It currently will not process functions with function calls. It currently only supports the GLSL.std.450 extended instruction set. It currently does not support any extensions. This pass will be made more effective by first running passes that remove dead control flow and inlines function calls. This pass can be especially useful after running Local Access Chain Conversion, which tends to cause cycles of dead code to be left after Store/Load elimination passes are completed. These cycles cannot be eliminated with standard dead code elimination. Additionally: This transform uses a whitelist of instructions that it knows do have side effects, (a.k.a. combinators). It assumes other instructions have side effects: it will not remove them, and assumes they have side effects via their ID operands.
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for (const auto u : *uses) {
const SpvOp op = u.inst->opcode();
switch (op) {
case SpvOpAccessChain:
case SpvOpInBoundsAccessChain:
case SpvOpCopyObject: {
AddStores(u.inst->result_id());
} break;
case SpvOpLoad:
break;
Opt: Have "size" passes process full entry point call tree. Includes code to deal correctly with OpFunctionParameter. This is needed by opaque propagation which may not exhaustively inline entry point functions. Adds ProcessEntryPointCallTree: a method to do work on the functions in the entry point call trees in a deterministic order.
2017-08-10 22:42:16 +00:00
// If default, assume it stores eg frexp, modf, function call
Add AggressiveDCEPass Create aggressive dead code elimination pass This pass eliminates unused code from functions. In addition, it detects and eliminates code which may have spurious uses but which do not contribute to the output of the function. The most common cause of such code sequences is summations in loops whose result is no longer used due to dead code elimination. This optimization has additional compile time cost over standard dead code elimination. This pass only processes entry point functions. It also only processes shaders with logical addressing. It currently will not process functions with function calls. It currently only supports the GLSL.std.450 extended instruction set. It currently does not support any extensions. This pass will be made more effective by first running passes that remove dead control flow and inlines function calls. This pass can be especially useful after running Local Access Chain Conversion, which tends to cause cycles of dead code to be left after Store/Load elimination passes are completed. These cycles cannot be eliminated with standard dead code elimination. Additionally: This transform uses a whitelist of instructions that it knows do have side effects, (a.k.a. combinators). It assumes other instructions have side effects: it will not remove them, and assumes they have side effects via their ID operands.
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case SpvOpStore:
default: {
Re-format files in source, source/opt, source/util, source/val and tools. NFC. This just makes sure every file is formatted following the formatting definition in .clang-format. Re-formatted with: $ clang-format -i $(find source tools include -name '*.cpp') $ clang-format -i $(find source tools include -name '*.h')
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if (!IsLive(u.inst)) AddToWorklist(u.inst);
Add AggressiveDCEPass Create aggressive dead code elimination pass This pass eliminates unused code from functions. In addition, it detects and eliminates code which may have spurious uses but which do not contribute to the output of the function. The most common cause of such code sequences is summations in loops whose result is no longer used due to dead code elimination. This optimization has additional compile time cost over standard dead code elimination. This pass only processes entry point functions. It also only processes shaders with logical addressing. It currently will not process functions with function calls. It currently only supports the GLSL.std.450 extended instruction set. It currently does not support any extensions. This pass will be made more effective by first running passes that remove dead control flow and inlines function calls. This pass can be especially useful after running Local Access Chain Conversion, which tends to cause cycles of dead code to be left after Store/Load elimination passes are completed. These cycles cannot be eliminated with standard dead code elimination. Additionally: This transform uses a whitelist of instructions that it knows do have side effects, (a.k.a. combinators). It assumes other instructions have side effects: it will not remove them, and assumes they have side effects via their ID operands.
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} break;
}
}
}
bool AggressiveDCEPass::IsCombinator(uint32_t op) const {
return combinator_ops_shader_.find(op) != combinator_ops_shader_.end();
}
bool AggressiveDCEPass::IsCombinatorExt(ir::Instruction* inst) const {
assert(inst->opcode() == SpvOpExtInst);
if (inst->GetSingleWordInOperand(kExtInstSetIdInIndx) == glsl_std_450_id_) {
uint32_t op = inst->GetSingleWordInOperand(kExtInstInstructionInIndx);
return combinator_ops_glsl_std_450_.find(op) !=
Re-format files in source, source/opt, source/util, source/val and tools. NFC. This just makes sure every file is formatted following the formatting definition in .clang-format. Re-formatted with: $ clang-format -i $(find source tools include -name '*.cpp') $ clang-format -i $(find source tools include -name '*.h')
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combinator_ops_glsl_std_450_.end();
} else
Add AggressiveDCEPass Create aggressive dead code elimination pass This pass eliminates unused code from functions. In addition, it detects and eliminates code which may have spurious uses but which do not contribute to the output of the function. The most common cause of such code sequences is summations in loops whose result is no longer used due to dead code elimination. This optimization has additional compile time cost over standard dead code elimination. This pass only processes entry point functions. It also only processes shaders with logical addressing. It currently will not process functions with function calls. It currently only supports the GLSL.std.450 extended instruction set. It currently does not support any extensions. This pass will be made more effective by first running passes that remove dead control flow and inlines function calls. This pass can be especially useful after running Local Access Chain Conversion, which tends to cause cycles of dead code to be left after Store/Load elimination passes are completed. These cycles cannot be eliminated with standard dead code elimination. Additionally: This transform uses a whitelist of instructions that it knows do have side effects, (a.k.a. combinators). It assumes other instructions have side effects: it will not remove them, and assumes they have side effects via their ID operands.
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return false;
}
Add extension whitelists to size-reduction passes. Currently only SPV_KHR_variable_pointers is disallowed in passes which do pointer analysis. Positive and negative tests of the general extensions mechanism were added to aggressive_dce but cover all passes.
2017-07-19 00:57:26 +00:00
bool AggressiveDCEPass::AllExtensionsSupported() const {
// If any extension not in whitelist, return false
Re-factor Phi insertion code out of LocalMultiStoreElimPass Including a re-factor of common behaviour into class Pass: The following functions are now in class Pass: - IsLoopHeader. - ComputeStructuredOrder - ComputeStructuredSuccessors (annoyingly, I could not re-factor all instances of this function, the copy in common_uniform_elim_pass.cpp is slightly different and fails with the common implementation). - GetPointeeTypeId - TakeNextId - FinalizeNextId - MergeBlockIdIfAny This is a NFC (non-functional change)
2017-10-25 17:26:25 +00:00
for (auto& ei : get_module()->extensions()) {
Re-format files in source, source/opt, source/util, source/val and tools. NFC. This just makes sure every file is formatted following the formatting definition in .clang-format. Re-formatted with: $ clang-format -i $(find source tools include -name '*.cpp') $ clang-format -i $(find source tools include -name '*.h')
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const char* extName =
reinterpret_cast<const char*>(&ei.GetInOperand(0).words[0]);
Add extension whitelists to size-reduction passes. Currently only SPV_KHR_variable_pointers is disallowed in passes which do pointer analysis. Positive and negative tests of the general extensions mechanism were added to aggressive_dce but cover all passes.
2017-07-19 00:57:26 +00:00
if (extensions_whitelist_.find(extName) == extensions_whitelist_.end())
return false;
Add AggressiveDCEPass Create aggressive dead code elimination pass This pass eliminates unused code from functions. In addition, it detects and eliminates code which may have spurious uses but which do not contribute to the output of the function. The most common cause of such code sequences is summations in loops whose result is no longer used due to dead code elimination. This optimization has additional compile time cost over standard dead code elimination. This pass only processes entry point functions. It also only processes shaders with logical addressing. It currently will not process functions with function calls. It currently only supports the GLSL.std.450 extended instruction set. It currently does not support any extensions. This pass will be made more effective by first running passes that remove dead control flow and inlines function calls. This pass can be especially useful after running Local Access Chain Conversion, which tends to cause cycles of dead code to be left after Store/Load elimination passes are completed. These cycles cannot be eliminated with standard dead code elimination. Additionally: This transform uses a whitelist of instructions that it knows do have side effects, (a.k.a. combinators). It assumes other instructions have side effects: it will not remove them, and assumes they have side effects via their ID operands.
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}
Add extension whitelists to size-reduction passes. Currently only SPV_KHR_variable_pointers is disallowed in passes which do pointer analysis. Positive and negative tests of the general extensions mechanism were added to aggressive_dce but cover all passes.
2017-07-19 00:57:26 +00:00
return true;
Add AggressiveDCEPass Create aggressive dead code elimination pass This pass eliminates unused code from functions. In addition, it detects and eliminates code which may have spurious uses but which do not contribute to the output of the function. The most common cause of such code sequences is summations in loops whose result is no longer used due to dead code elimination. This optimization has additional compile time cost over standard dead code elimination. This pass only processes entry point functions. It also only processes shaders with logical addressing. It currently will not process functions with function calls. It currently only supports the GLSL.std.450 extended instruction set. It currently does not support any extensions. This pass will be made more effective by first running passes that remove dead control flow and inlines function calls. This pass can be especially useful after running Local Access Chain Conversion, which tends to cause cycles of dead code to be left after Store/Load elimination passes are completed. These cycles cannot be eliminated with standard dead code elimination. Additionally: This transform uses a whitelist of instructions that it knows do have side effects, (a.k.a. combinators). It assumes other instructions have side effects: it will not remove them, and assumes they have side effects via their ID operands.
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}
ADCE: Add support for function calls ADCE will now generate correct code in the presence of function calls. This is needed for opaque type optimization needed by glslang. Currently all function calls are marked as live. TODO: mark calls live only if they write a non-local.
2017-08-04 21:04:37 +00:00
bool AggressiveDCEPass::KillInstIfTargetDead(ir::Instruction* inst) {
Add AggressiveDCEPass Create aggressive dead code elimination pass This pass eliminates unused code from functions. In addition, it detects and eliminates code which may have spurious uses but which do not contribute to the output of the function. The most common cause of such code sequences is summations in loops whose result is no longer used due to dead code elimination. This optimization has additional compile time cost over standard dead code elimination. This pass only processes entry point functions. It also only processes shaders with logical addressing. It currently will not process functions with function calls. It currently only supports the GLSL.std.450 extended instruction set. It currently does not support any extensions. This pass will be made more effective by first running passes that remove dead control flow and inlines function calls. This pass can be especially useful after running Local Access Chain Conversion, which tends to cause cycles of dead code to be left after Store/Load elimination passes are completed. These cycles cannot be eliminated with standard dead code elimination. Additionally: This transform uses a whitelist of instructions that it knows do have side effects, (a.k.a. combinators). It assumes other instructions have side effects: it will not remove them, and assumes they have side effects via their ID operands.
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const uint32_t tId = inst->GetSingleWordInOperand(0);
Re-factor Phi insertion code out of LocalMultiStoreElimPass Including a re-factor of common behaviour into class Pass: The following functions are now in class Pass: - IsLoopHeader. - ComputeStructuredOrder - ComputeStructuredSuccessors (annoyingly, I could not re-factor all instances of this function, the copy in common_uniform_elim_pass.cpp is slightly different and fails with the common implementation). - GetPointeeTypeId - TakeNextId - FinalizeNextId - MergeBlockIdIfAny This is a NFC (non-functional change)
2017-10-25 17:26:25 +00:00
const ir::Instruction* tInst = get_def_use_mgr()->GetDef(tId);
ADCE: Add support for function calls ADCE will now generate correct code in the presence of function calls. This is needed for opaque type optimization needed by glslang. Currently all function calls are marked as live. TODO: mark calls live only if they write a non-local.
2017-08-04 21:04:37 +00:00
if (dead_insts_.find(tInst) != dead_insts_.end()) {
Add the IRContext (part 2): Add def-use manager This change will move the instances of the def-use manager to the IRContext. This allows it to persists across optimization, and does not have to be rebuilt multiple times. Added test to ensure that the IRContext is validating and invalidating the analyses correctly.
2017-11-02 18:25:48 +00:00
context()->KillInst(inst);
ADCE: Add support for function calls ADCE will now generate correct code in the presence of function calls. This is needed for opaque type optimization needed by glslang. Currently all function calls are marked as live. TODO: mark calls live only if they write a non-local.
2017-08-04 21:04:37 +00:00
return true;
}
return false;
}
void AggressiveDCEPass::ProcessLoad(uint32_t varId) {
// Only process locals
Re-format files in source, source/opt, source/util, source/val and tools. NFC. This just makes sure every file is formatted following the formatting definition in .clang-format. Re-formatted with: $ clang-format -i $(find source tools include -name '*.cpp') $ clang-format -i $(find source tools include -name '*.h')
2017-11-08 17:40:02 +00:00
if (!IsLocalVar(varId)) return;
ADCE: Add support for function calls ADCE will now generate correct code in the presence of function calls. This is needed for opaque type optimization needed by glslang. Currently all function calls are marked as live. TODO: mark calls live only if they write a non-local.
2017-08-04 21:04:37 +00:00
// Return if already processed
Re-format files in source, source/opt, source/util, source/val and tools. NFC. This just makes sure every file is formatted following the formatting definition in .clang-format. Re-formatted with: $ clang-format -i $(find source tools include -name '*.cpp') $ clang-format -i $(find source tools include -name '*.h')
2017-11-08 17:40:02 +00:00
if (live_local_vars_.find(varId) != live_local_vars_.end()) return;
ADCE: Add support for function calls ADCE will now generate correct code in the presence of function calls. This is needed for opaque type optimization needed by glslang. Currently all function calls are marked as live. TODO: mark calls live only if they write a non-local.
2017-08-04 21:04:37 +00:00
// Mark all stores to varId as live
AddStores(varId);
// Cache varId as processed
live_local_vars_.insert(varId);
Add AggressiveDCEPass Create aggressive dead code elimination pass This pass eliminates unused code from functions. In addition, it detects and eliminates code which may have spurious uses but which do not contribute to the output of the function. The most common cause of such code sequences is summations in loops whose result is no longer used due to dead code elimination. This optimization has additional compile time cost over standard dead code elimination. This pass only processes entry point functions. It also only processes shaders with logical addressing. It currently will not process functions with function calls. It currently only supports the GLSL.std.450 extended instruction set. It currently does not support any extensions. This pass will be made more effective by first running passes that remove dead control flow and inlines function calls. This pass can be especially useful after running Local Access Chain Conversion, which tends to cause cycles of dead code to be left after Store/Load elimination passes are completed. These cycles cannot be eliminated with standard dead code elimination. Additionally: This transform uses a whitelist of instructions that it knows do have side effects, (a.k.a. combinators). It assumes other instructions have side effects: it will not remove them, and assumes they have side effects via their ID operands.
2017-06-08 16:37:21 +00:00
}
ADCE: Dead if elimination Mark structured conditional branches live only if one or more instructions in their associated construct is marked live. After closure, replace dead structured conditional branches with a branch to its merge and remove dead blocks. ADCE: Dead If Elim: Remove duplicate StructuredOrder code Also generalize ComputeStructuredOrder so that the caller can specify the root block for the order. Phi insertion uses pseudo_entry_block and adce and dead branch elim use the first block of the function. ADCE: Dead If Elim: Pull redundant code out of InsertPhiInstructions ADCE: Dead If Elim: Encapsulate CFG Cleanup Initialization ADCE: Dead If Elim: Remove redundant code from ADCE initialization ADCE: Dead If: Use CFGCleanup to eliminate newly dead blocks Moved bulk of CFG Cleanup code into MemPass.
2017-10-17 22:33:43 +00:00
bool AggressiveDCEPass::IsStructuredIfHeader(ir::BasicBlock* bp,
Re-format files in source, source/opt, source/util, source/val and tools. NFC. This just makes sure every file is formatted following the formatting definition in .clang-format. Re-formatted with: $ clang-format -i $(find source tools include -name '*.cpp') $ clang-format -i $(find source tools include -name '*.h')
2017-11-08 17:40:02 +00:00
ir::Instruction** mergeInst,
ir::Instruction** branchInst,
uint32_t* mergeBlockId) {
ADCE: Dead if elimination Mark structured conditional branches live only if one or more instructions in their associated construct is marked live. After closure, replace dead structured conditional branches with a branch to its merge and remove dead blocks. ADCE: Dead If Elim: Remove duplicate StructuredOrder code Also generalize ComputeStructuredOrder so that the caller can specify the root block for the order. Phi insertion uses pseudo_entry_block and adce and dead branch elim use the first block of the function. ADCE: Dead If Elim: Pull redundant code out of InsertPhiInstructions ADCE: Dead If Elim: Encapsulate CFG Cleanup Initialization ADCE: Dead If Elim: Remove redundant code from ADCE initialization ADCE: Dead If: Use CFGCleanup to eliminate newly dead blocks Moved bulk of CFG Cleanup code into MemPass.
2017-10-17 22:33:43 +00:00
auto ii = bp->end();
--ii;
Re-format files in source, source/opt, source/util, source/val and tools. NFC. This just makes sure every file is formatted following the formatting definition in .clang-format. Re-formatted with: $ clang-format -i $(find source tools include -name '*.cpp') $ clang-format -i $(find source tools include -name '*.h')
2017-11-08 17:40:02 +00:00
if (ii->opcode() != SpvOpBranchConditional) return false;
if (ii == bp->begin()) return false;
ADCE: Dead if elimination Mark structured conditional branches live only if one or more instructions in their associated construct is marked live. After closure, replace dead structured conditional branches with a branch to its merge and remove dead blocks. ADCE: Dead If Elim: Remove duplicate StructuredOrder code Also generalize ComputeStructuredOrder so that the caller can specify the root block for the order. Phi insertion uses pseudo_entry_block and adce and dead branch elim use the first block of the function. ADCE: Dead If Elim: Pull redundant code out of InsertPhiInstructions ADCE: Dead If Elim: Encapsulate CFG Cleanup Initialization ADCE: Dead If Elim: Remove redundant code from ADCE initialization ADCE: Dead If: Use CFGCleanup to eliminate newly dead blocks Moved bulk of CFG Cleanup code into MemPass.
2017-10-17 22:33:43 +00:00
if (branchInst != nullptr) *branchInst = &*ii;
--ii;
Re-format files in source, source/opt, source/util, source/val and tools. NFC. This just makes sure every file is formatted following the formatting definition in .clang-format. Re-formatted with: $ clang-format -i $(find source tools include -name '*.cpp') $ clang-format -i $(find source tools include -name '*.h')
2017-11-08 17:40:02 +00:00
if (ii->opcode() != SpvOpSelectionMerge) return false;
if (mergeInst != nullptr) *mergeInst = &*ii;
ADCE: Dead if elimination Mark structured conditional branches live only if one or more instructions in their associated construct is marked live. After closure, replace dead structured conditional branches with a branch to its merge and remove dead blocks. ADCE: Dead If Elim: Remove duplicate StructuredOrder code Also generalize ComputeStructuredOrder so that the caller can specify the root block for the order. Phi insertion uses pseudo_entry_block and adce and dead branch elim use the first block of the function. ADCE: Dead If Elim: Pull redundant code out of InsertPhiInstructions ADCE: Dead If Elim: Encapsulate CFG Cleanup Initialization ADCE: Dead If Elim: Remove redundant code from ADCE initialization ADCE: Dead If: Use CFGCleanup to eliminate newly dead blocks Moved bulk of CFG Cleanup code into MemPass.
2017-10-17 22:33:43 +00:00
if (mergeBlockId != nullptr)
*mergeBlockId =
ii->GetSingleWordInOperand(kSelectionMergeMergeBlockIdInIdx);
return true;
}
void AggressiveDCEPass::ComputeBlock2HeaderMaps(
Re-format files in source, source/opt, source/util, source/val and tools. NFC. This just makes sure every file is formatted following the formatting definition in .clang-format. Re-formatted with: $ clang-format -i $(find source tools include -name '*.cpp') $ clang-format -i $(find source tools include -name '*.h')
2017-11-08 17:40:02 +00:00
std::list<ir::BasicBlock*>& structuredOrder) {
ADCE: Dead if elimination Mark structured conditional branches live only if one or more instructions in their associated construct is marked live. After closure, replace dead structured conditional branches with a branch to its merge and remove dead blocks. ADCE: Dead If Elim: Remove duplicate StructuredOrder code Also generalize ComputeStructuredOrder so that the caller can specify the root block for the order. Phi insertion uses pseudo_entry_block and adce and dead branch elim use the first block of the function. ADCE: Dead If Elim: Pull redundant code out of InsertPhiInstructions ADCE: Dead If Elim: Encapsulate CFG Cleanup Initialization ADCE: Dead If Elim: Remove redundant code from ADCE initialization ADCE: Dead If: Use CFGCleanup to eliminate newly dead blocks Moved bulk of CFG Cleanup code into MemPass.
2017-10-17 22:33:43 +00:00
block2headerMerge_.clear();
block2headerBranch_.clear();
std::stack<ir::Instruction*> currentMergeInst;
std::stack<ir::Instruction*> currentBranchInst;
std::stack<uint32_t> currentMergeBlockId;
currentMergeInst.push(nullptr);
currentBranchInst.push(nullptr);
currentMergeBlockId.push(0);
for (auto bi = structuredOrder.begin(); bi != structuredOrder.end(); ++bi) {
if ((*bi)->id() == currentMergeBlockId.top()) {
currentMergeBlockId.pop();
currentMergeInst.pop();
currentBranchInst.pop();
}
block2headerMerge_[*bi] = currentMergeInst.top();
block2headerBranch_[*bi] = currentBranchInst.top();
ir::Instruction* mergeInst;
ir::Instruction* branchInst;
uint32_t mergeBlockId;
if (IsStructuredIfHeader(*bi, &mergeInst, &branchInst, &mergeBlockId)) {
currentMergeBlockId.push(mergeBlockId);
currentMergeInst.push(mergeInst);
currentBranchInst.push(branchInst);
}
}
}
void AggressiveDCEPass::ComputeInst2BlockMap(ir::Function* func) {
for (auto& blk : *func) {
Re-format files in source, source/opt, source/util, source/val and tools. NFC. This just makes sure every file is formatted following the formatting definition in .clang-format. Re-formatted with: $ clang-format -i $(find source tools include -name '*.cpp') $ clang-format -i $(find source tools include -name '*.h')
2017-11-08 17:40:02 +00:00
blk.ForEachInst(
[&blk, this](ir::Instruction* ip) { inst2block_[ip] = &blk; });
ADCE: Dead if elimination Mark structured conditional branches live only if one or more instructions in their associated construct is marked live. After closure, replace dead structured conditional branches with a branch to its merge and remove dead blocks. ADCE: Dead If Elim: Remove duplicate StructuredOrder code Also generalize ComputeStructuredOrder so that the caller can specify the root block for the order. Phi insertion uses pseudo_entry_block and adce and dead branch elim use the first block of the function. ADCE: Dead If Elim: Pull redundant code out of InsertPhiInstructions ADCE: Dead If Elim: Encapsulate CFG Cleanup Initialization ADCE: Dead If Elim: Remove redundant code from ADCE initialization ADCE: Dead If: Use CFGCleanup to eliminate newly dead blocks Moved bulk of CFG Cleanup code into MemPass.
2017-10-17 22:33:43 +00:00
}
}
void AggressiveDCEPass::AddBranch(uint32_t labelId, ir::BasicBlock* bp) {
Re-format files in source, source/opt, source/util, source/val and tools. NFC. This just makes sure every file is formatted following the formatting definition in .clang-format. Re-formatted with: $ clang-format -i $(find source tools include -name '*.cpp') $ clang-format -i $(find source tools include -name '*.h')
2017-11-08 17:40:02 +00:00
std::unique_ptr<ir::Instruction> newBranch(new ir::Instruction(
Adding an unique id to Instruction generated by IRContext Each instruction is given an unique id that can be used for ordering purposes. The ids are generated via the IRContext. Major changes: * Instructions now contain a uint32_t for unique id and a cached context pointer * Most constructors have been modified to take a context as input * unfortunately I cannot remove the default and copy constructors, but developers should avoid these * Added accessors to parents of basic block and function * Removed the copy constructors for BasicBlock and Function and replaced them with Clone functions * Reworked BuildModule to return an IRContext owning the built module * Since all instructions require a context, the context now becomes the basic unit for IR * Added a constructor to context to create an owned module internally * Replaced uses of Instruction's copy constructor with Clone whereever I found them * Reworked the linker functionality to perform clones into a different context instead of moves * Updated many tests to be consistent with the above changes * Still need to add new tests to cover added functionality * Added comparison operators to Instruction * Added an internal option to LinkerOptions to verify merged ids are unique * Added a test for the linker to verify merged ids are unique * Updated MergeReturnPass to supply a context * Updated DecorationManager to supply a context for cloned decorations * Reworked several portions of the def use tests in anticipation of next set of changes
2017-11-14 19:11:50 +00:00
context(), SpvOpBranch, 0, 0,
Re-format files in source, source/opt, source/util, source/val and tools. NFC. This just makes sure every file is formatted following the formatting definition in .clang-format. Re-formatted with: $ clang-format -i $(find source tools include -name '*.cpp') $ clang-format -i $(find source tools include -name '*.h')
2017-11-08 17:40:02 +00:00
{{spv_operand_type_t::SPV_OPERAND_TYPE_ID, {labelId}}}));
ADCE: Dead if elimination Mark structured conditional branches live only if one or more instructions in their associated construct is marked live. After closure, replace dead structured conditional branches with a branch to its merge and remove dead blocks. ADCE: Dead If Elim: Remove duplicate StructuredOrder code Also generalize ComputeStructuredOrder so that the caller can specify the root block for the order. Phi insertion uses pseudo_entry_block and adce and dead branch elim use the first block of the function. ADCE: Dead If Elim: Pull redundant code out of InsertPhiInstructions ADCE: Dead If Elim: Encapsulate CFG Cleanup Initialization ADCE: Dead If Elim: Remove redundant code from ADCE initialization ADCE: Dead If: Use CFGCleanup to eliminate newly dead blocks Moved bulk of CFG Cleanup code into MemPass.
2017-10-17 22:33:43 +00:00
get_def_use_mgr()->AnalyzeInstDefUse(&*newBranch);
bp->AddInstruction(std::move(newBranch));
}
Add AggressiveDCEPass Create aggressive dead code elimination pass This pass eliminates unused code from functions. In addition, it detects and eliminates code which may have spurious uses but which do not contribute to the output of the function. The most common cause of such code sequences is summations in loops whose result is no longer used due to dead code elimination. This optimization has additional compile time cost over standard dead code elimination. This pass only processes entry point functions. It also only processes shaders with logical addressing. It currently will not process functions with function calls. It currently only supports the GLSL.std.450 extended instruction set. It currently does not support any extensions. This pass will be made more effective by first running passes that remove dead control flow and inlines function calls. This pass can be especially useful after running Local Access Chain Conversion, which tends to cause cycles of dead code to be left after Store/Load elimination passes are completed. These cycles cannot be eliminated with standard dead code elimination. Additionally: This transform uses a whitelist of instructions that it knows do have side effects, (a.k.a. combinators). It assumes other instructions have side effects: it will not remove them, and assumes they have side effects via their ID operands.
2017-06-08 16:37:21 +00:00
bool AggressiveDCEPass::AggressiveDCE(ir::Function* func) {
ADCE: Dead if elimination Mark structured conditional branches live only if one or more instructions in their associated construct is marked live. After closure, replace dead structured conditional branches with a branch to its merge and remove dead blocks. ADCE: Dead If Elim: Remove duplicate StructuredOrder code Also generalize ComputeStructuredOrder so that the caller can specify the root block for the order. Phi insertion uses pseudo_entry_block and adce and dead branch elim use the first block of the function. ADCE: Dead If Elim: Pull redundant code out of InsertPhiInstructions ADCE: Dead If Elim: Encapsulate CFG Cleanup Initialization ADCE: Dead If Elim: Remove redundant code from ADCE initialization ADCE: Dead If: Use CFGCleanup to eliminate newly dead blocks Moved bulk of CFG Cleanup code into MemPass.
2017-10-17 22:33:43 +00:00
// Compute map from instruction to block
ComputeInst2BlockMap(func);
// Compute map from block to controlling conditional branch
std::list<ir::BasicBlock*> structuredOrder;
Add a new class opt::CFG to represent the CFG for the module. This class moves some of the CFG-related functionality into a new class opt::CFG. There is some other code related to the CFG in the inliner and in opt::LocalSingleStoreElimPass that should also be moved, but that require more changes than this pure restructuring. I will move those bits in a follow-up PR. Currently, the CFG is computed every time a pass is instantiated, but this should be later moved to the new IRContext class that @s-perron is working on. Other re-factoring: - Add BasicBlock::ContinueBlockIdIfAny. Re-factored out of MergeBlockIdIfAny - Rewrite IsLoopHeader in terms of GetLoopMergeInst. - Run clang-format on some files.
2017-10-30 21:42:26 +00:00
cfg()->ComputeStructuredOrder(func, &*func->begin(), &structuredOrder);
ADCE: Dead if elimination Mark structured conditional branches live only if one or more instructions in their associated construct is marked live. After closure, replace dead structured conditional branches with a branch to its merge and remove dead blocks. ADCE: Dead If Elim: Remove duplicate StructuredOrder code Also generalize ComputeStructuredOrder so that the caller can specify the root block for the order. Phi insertion uses pseudo_entry_block and adce and dead branch elim use the first block of the function. ADCE: Dead If Elim: Pull redundant code out of InsertPhiInstructions ADCE: Dead If Elim: Encapsulate CFG Cleanup Initialization ADCE: Dead If Elim: Remove redundant code from ADCE initialization ADCE: Dead If: Use CFGCleanup to eliminate newly dead blocks Moved bulk of CFG Cleanup code into MemPass.
2017-10-17 22:33:43 +00:00
ComputeBlock2HeaderMaps(structuredOrder);
Add AggressiveDCEPass Create aggressive dead code elimination pass This pass eliminates unused code from functions. In addition, it detects and eliminates code which may have spurious uses but which do not contribute to the output of the function. The most common cause of such code sequences is summations in loops whose result is no longer used due to dead code elimination. This optimization has additional compile time cost over standard dead code elimination. This pass only processes entry point functions. It also only processes shaders with logical addressing. It currently will not process functions with function calls. It currently only supports the GLSL.std.450 extended instruction set. It currently does not support any extensions. This pass will be made more effective by first running passes that remove dead control flow and inlines function calls. This pass can be especially useful after running Local Access Chain Conversion, which tends to cause cycles of dead code to be left after Store/Load elimination passes are completed. These cycles cannot be eliminated with standard dead code elimination. Additionally: This transform uses a whitelist of instructions that it knows do have side effects, (a.k.a. combinators). It assumes other instructions have side effects: it will not remove them, and assumes they have side effects via their ID operands.
2017-06-08 16:37:21 +00:00
bool modified = false;
ADCE: Dead if elimination Mark structured conditional branches live only if one or more instructions in their associated construct is marked live. After closure, replace dead structured conditional branches with a branch to its merge and remove dead blocks. ADCE: Dead If Elim: Remove duplicate StructuredOrder code Also generalize ComputeStructuredOrder so that the caller can specify the root block for the order. Phi insertion uses pseudo_entry_block and adce and dead branch elim use the first block of the function. ADCE: Dead If Elim: Pull redundant code out of InsertPhiInstructions ADCE: Dead If Elim: Encapsulate CFG Cleanup Initialization ADCE: Dead If Elim: Remove redundant code from ADCE initialization ADCE: Dead If: Use CFGCleanup to eliminate newly dead blocks Moved bulk of CFG Cleanup code into MemPass.
2017-10-17 22:33:43 +00:00
// Add instructions with external side effects to worklist. Also add branches
// EXCEPT those immediately contained in an "if" selection construct.
Add AggressiveDCEPass Create aggressive dead code elimination pass This pass eliminates unused code from functions. In addition, it detects and eliminates code which may have spurious uses but which do not contribute to the output of the function. The most common cause of such code sequences is summations in loops whose result is no longer used due to dead code elimination. This optimization has additional compile time cost over standard dead code elimination. This pass only processes entry point functions. It also only processes shaders with logical addressing. It currently will not process functions with function calls. It currently only supports the GLSL.std.450 extended instruction set. It currently does not support any extensions. This pass will be made more effective by first running passes that remove dead control flow and inlines function calls. This pass can be especially useful after running Local Access Chain Conversion, which tends to cause cycles of dead code to be left after Store/Load elimination passes are completed. These cycles cannot be eliminated with standard dead code elimination. Additionally: This transform uses a whitelist of instructions that it knows do have side effects, (a.k.a. combinators). It assumes other instructions have side effects: it will not remove them, and assumes they have side effects via their ID operands.
2017-06-08 16:37:21 +00:00
// TODO(greg-lunarg): Handle Frexp, Modf more optimally
ADCE: Treat privates like locals in entry point with no calls This is needed for ongoing legalization of HLSL. It allows removal of accesses to textures/buffers that are not used.
2017-10-10 20:35:53 +00:00
call_in_func_ = false;
func_is_entry_point_ = false;
private_stores_.clear();
ADCE: Dead if elimination Mark structured conditional branches live only if one or more instructions in their associated construct is marked live. After closure, replace dead structured conditional branches with a branch to its merge and remove dead blocks. ADCE: Dead If Elim: Remove duplicate StructuredOrder code Also generalize ComputeStructuredOrder so that the caller can specify the root block for the order. Phi insertion uses pseudo_entry_block and adce and dead branch elim use the first block of the function. ADCE: Dead If Elim: Pull redundant code out of InsertPhiInstructions ADCE: Dead If Elim: Encapsulate CFG Cleanup Initialization ADCE: Dead If Elim: Remove redundant code from ADCE initialization ADCE: Dead If: Use CFGCleanup to eliminate newly dead blocks Moved bulk of CFG Cleanup code into MemPass.
2017-10-17 22:33:43 +00:00
// Stacks to keep track of when we are inside an if-construct. When not
Re-format files in source, source/opt, source/util, source/val and tools. NFC. This just makes sure every file is formatted following the formatting definition in .clang-format. Re-formatted with: $ clang-format -i $(find source tools include -name '*.cpp') $ clang-format -i $(find source tools include -name '*.h')
2017-11-08 17:40:02 +00:00
// immediately inside an in-construct, we must assume all branches are live.
ADCE: Dead if elimination Mark structured conditional branches live only if one or more instructions in their associated construct is marked live. After closure, replace dead structured conditional branches with a branch to its merge and remove dead blocks. ADCE: Dead If Elim: Remove duplicate StructuredOrder code Also generalize ComputeStructuredOrder so that the caller can specify the root block for the order. Phi insertion uses pseudo_entry_block and adce and dead branch elim use the first block of the function. ADCE: Dead If Elim: Pull redundant code out of InsertPhiInstructions ADCE: Dead If Elim: Encapsulate CFG Cleanup Initialization ADCE: Dead If Elim: Remove redundant code from ADCE initialization ADCE: Dead If: Use CFGCleanup to eliminate newly dead blocks Moved bulk of CFG Cleanup code into MemPass.
2017-10-17 22:33:43 +00:00
std::stack<bool> assume_branches_live;
std::stack<uint32_t> currentMergeBlockId;
// Push sentinel values on stack for when outside of any control flow.
assume_branches_live.push(true);
currentMergeBlockId.push(0);
for (auto bi = structuredOrder.begin(); bi != structuredOrder.end(); ++bi) {
if ((*bi)->id() == currentMergeBlockId.top()) {
assume_branches_live.pop();
currentMergeBlockId.pop();
}
for (auto ii = (*bi)->begin(); ii != (*bi)->end(); ++ii) {
SpvOp op = ii->opcode();
Add AggressiveDCEPass Create aggressive dead code elimination pass This pass eliminates unused code from functions. In addition, it detects and eliminates code which may have spurious uses but which do not contribute to the output of the function. The most common cause of such code sequences is summations in loops whose result is no longer used due to dead code elimination. This optimization has additional compile time cost over standard dead code elimination. This pass only processes entry point functions. It also only processes shaders with logical addressing. It currently will not process functions with function calls. It currently only supports the GLSL.std.450 extended instruction set. It currently does not support any extensions. This pass will be made more effective by first running passes that remove dead control flow and inlines function calls. This pass can be especially useful after running Local Access Chain Conversion, which tends to cause cycles of dead code to be left after Store/Load elimination passes are completed. These cycles cannot be eliminated with standard dead code elimination. Additionally: This transform uses a whitelist of instructions that it knows do have side effects, (a.k.a. combinators). It assumes other instructions have side effects: it will not remove them, and assumes they have side effects via their ID operands.
2017-06-08 16:37:21 +00:00
switch (op) {
case SpvOpStore: {
uint32_t varId;
Re-format files in source, source/opt, source/util, source/val and tools. NFC. This just makes sure every file is formatted following the formatting definition in .clang-format. Re-formatted with: $ clang-format -i $(find source tools include -name '*.cpp') $ clang-format -i $(find source tools include -name '*.h')
2017-11-08 17:40:02 +00:00
(void)GetPtr(&*ii, &varId);
ADCE: Treat privates like locals in entry point with no calls This is needed for ongoing legalization of HLSL. It allows removal of accesses to textures/buffers that are not used.
2017-10-10 20:35:53 +00:00
// Mark stores as live if their variable is not function scope
// and is not private scope. Remember private stores for possible
// later inclusion
if (IsVarOfStorage(varId, SpvStorageClassPrivate))
ADCE: Dead if elimination Mark structured conditional branches live only if one or more instructions in their associated construct is marked live. After closure, replace dead structured conditional branches with a branch to its merge and remove dead blocks. ADCE: Dead If Elim: Remove duplicate StructuredOrder code Also generalize ComputeStructuredOrder so that the caller can specify the root block for the order. Phi insertion uses pseudo_entry_block and adce and dead branch elim use the first block of the function. ADCE: Dead If Elim: Pull redundant code out of InsertPhiInstructions ADCE: Dead If Elim: Encapsulate CFG Cleanup Initialization ADCE: Dead If Elim: Remove redundant code from ADCE initialization ADCE: Dead If: Use CFGCleanup to eliminate newly dead blocks Moved bulk of CFG Cleanup code into MemPass.
2017-10-17 22:33:43 +00:00
private_stores_.push_back(&*ii);
ADCE: Treat privates like locals in entry point with no calls This is needed for ongoing legalization of HLSL. It allows removal of accesses to textures/buffers that are not used.
2017-10-10 20:35:53 +00:00
else if (!IsVarOfStorage(varId, SpvStorageClassFunction))
ADCE: Dead if elimination Mark structured conditional branches live only if one or more instructions in their associated construct is marked live. After closure, replace dead structured conditional branches with a branch to its merge and remove dead blocks. ADCE: Dead If Elim: Remove duplicate StructuredOrder code Also generalize ComputeStructuredOrder so that the caller can specify the root block for the order. Phi insertion uses pseudo_entry_block and adce and dead branch elim use the first block of the function. ADCE: Dead If Elim: Pull redundant code out of InsertPhiInstructions ADCE: Dead If Elim: Encapsulate CFG Cleanup Initialization ADCE: Dead If Elim: Remove redundant code from ADCE initialization ADCE: Dead If: Use CFGCleanup to eliminate newly dead blocks Moved bulk of CFG Cleanup code into MemPass.
2017-10-17 22:33:43 +00:00
AddToWorklist(&*ii);
Add AggressiveDCEPass Create aggressive dead code elimination pass This pass eliminates unused code from functions. In addition, it detects and eliminates code which may have spurious uses but which do not contribute to the output of the function. The most common cause of such code sequences is summations in loops whose result is no longer used due to dead code elimination. This optimization has additional compile time cost over standard dead code elimination. This pass only processes entry point functions. It also only processes shaders with logical addressing. It currently will not process functions with function calls. It currently only supports the GLSL.std.450 extended instruction set. It currently does not support any extensions. This pass will be made more effective by first running passes that remove dead control flow and inlines function calls. This pass can be especially useful after running Local Access Chain Conversion, which tends to cause cycles of dead code to be left after Store/Load elimination passes are completed. These cycles cannot be eliminated with standard dead code elimination. Additionally: This transform uses a whitelist of instructions that it knows do have side effects, (a.k.a. combinators). It assumes other instructions have side effects: it will not remove them, and assumes they have side effects via their ID operands.
2017-06-08 16:37:21 +00:00
} break;
case SpvOpExtInst: {
// eg. GLSL frexp, modf
Re-format files in source, source/opt, source/util, source/val and tools. NFC. This just makes sure every file is formatted following the formatting definition in .clang-format. Re-formatted with: $ clang-format -i $(find source tools include -name '*.cpp') $ clang-format -i $(find source tools include -name '*.h')
2017-11-08 17:40:02 +00:00
if (!IsCombinatorExt(&*ii)) AddToWorklist(&*ii);
ADCE: Dead if elimination Mark structured conditional branches live only if one or more instructions in their associated construct is marked live. After closure, replace dead structured conditional branches with a branch to its merge and remove dead blocks. ADCE: Dead If Elim: Remove duplicate StructuredOrder code Also generalize ComputeStructuredOrder so that the caller can specify the root block for the order. Phi insertion uses pseudo_entry_block and adce and dead branch elim use the first block of the function. ADCE: Dead If Elim: Pull redundant code out of InsertPhiInstructions ADCE: Dead If Elim: Encapsulate CFG Cleanup Initialization ADCE: Dead If Elim: Remove redundant code from ADCE initialization ADCE: Dead If: Use CFGCleanup to eliminate newly dead blocks Moved bulk of CFG Cleanup code into MemPass.
2017-10-17 22:33:43 +00:00
} break;
case SpvOpLoopMerge: {
// Assume loops live (for now)
// TODO(greg-lunarg): Add dead loop elimination
assume_branches_live.push(true);
currentMergeBlockId.push(
ii->GetSingleWordInOperand(kLoopMergeMergeBlockIdInIdx));
AddToWorklist(&*ii);
} break;
case SpvOpSelectionMerge: {
auto brii = ii;
++brii;
bool is_structured_if = brii->opcode() == SpvOpBranchConditional;
assume_branches_live.push(!is_structured_if);
currentMergeBlockId.push(
ii->GetSingleWordInOperand(kSelectionMergeMergeBlockIdInIdx));
Re-format files in source, source/opt, source/util, source/val and tools. NFC. This just makes sure every file is formatted following the formatting definition in .clang-format. Re-formatted with: $ clang-format -i $(find source tools include -name '*.cpp') $ clang-format -i $(find source tools include -name '*.h')
2017-11-08 17:40:02 +00:00
if (!is_structured_if) AddToWorklist(&*ii);
ADCE: Dead if elimination Mark structured conditional branches live only if one or more instructions in their associated construct is marked live. After closure, replace dead structured conditional branches with a branch to its merge and remove dead blocks. ADCE: Dead If Elim: Remove duplicate StructuredOrder code Also generalize ComputeStructuredOrder so that the caller can specify the root block for the order. Phi insertion uses pseudo_entry_block and adce and dead branch elim use the first block of the function. ADCE: Dead If Elim: Pull redundant code out of InsertPhiInstructions ADCE: Dead If Elim: Encapsulate CFG Cleanup Initialization ADCE: Dead If Elim: Remove redundant code from ADCE initialization ADCE: Dead If: Use CFGCleanup to eliminate newly dead blocks Moved bulk of CFG Cleanup code into MemPass.
2017-10-17 22:33:43 +00:00
} break;
case SpvOpBranch:
case SpvOpBranchConditional: {
Re-format files in source, source/opt, source/util, source/val and tools. NFC. This just makes sure every file is formatted following the formatting definition in .clang-format. Re-formatted with: $ clang-format -i $(find source tools include -name '*.cpp') $ clang-format -i $(find source tools include -name '*.h')
2017-11-08 17:40:02 +00:00
if (assume_branches_live.top()) AddToWorklist(&*ii);
Add AggressiveDCEPass Create aggressive dead code elimination pass This pass eliminates unused code from functions. In addition, it detects and eliminates code which may have spurious uses but which do not contribute to the output of the function. The most common cause of such code sequences is summations in loops whose result is no longer used due to dead code elimination. This optimization has additional compile time cost over standard dead code elimination. This pass only processes entry point functions. It also only processes shaders with logical addressing. It currently will not process functions with function calls. It currently only supports the GLSL.std.450 extended instruction set. It currently does not support any extensions. This pass will be made more effective by first running passes that remove dead control flow and inlines function calls. This pass can be especially useful after running Local Access Chain Conversion, which tends to cause cycles of dead code to be left after Store/Load elimination passes are completed. These cycles cannot be eliminated with standard dead code elimination. Additionally: This transform uses a whitelist of instructions that it knows do have side effects, (a.k.a. combinators). It assumes other instructions have side effects: it will not remove them, and assumes they have side effects via their ID operands.
2017-06-08 16:37:21 +00:00
} break;
default: {
ADCE: Dead if elimination Mark structured conditional branches live only if one or more instructions in their associated construct is marked live. After closure, replace dead structured conditional branches with a branch to its merge and remove dead blocks. ADCE: Dead If Elim: Remove duplicate StructuredOrder code Also generalize ComputeStructuredOrder so that the caller can specify the root block for the order. Phi insertion uses pseudo_entry_block and adce and dead branch elim use the first block of the function. ADCE: Dead If Elim: Pull redundant code out of InsertPhiInstructions ADCE: Dead If Elim: Encapsulate CFG Cleanup Initialization ADCE: Dead If Elim: Remove redundant code from ADCE initialization ADCE: Dead If: Use CFGCleanup to eliminate newly dead blocks Moved bulk of CFG Cleanup code into MemPass.
2017-10-17 22:33:43 +00:00
// Function calls, atomics, function params, function returns, etc.
ADCE: Add support for function calls ADCE will now generate correct code in the presence of function calls. This is needed for opaque type optimization needed by glslang. Currently all function calls are marked as live. TODO: mark calls live only if they write a non-local.
2017-08-04 21:04:37 +00:00
// TODO(greg-lunarg): function calls live only if write to non-local
Re-format files in source, source/opt, source/util, source/val and tools. NFC. This just makes sure every file is formatted following the formatting definition in .clang-format. Re-formatted with: $ clang-format -i $(find source tools include -name '*.cpp') $ clang-format -i $(find source tools include -name '*.h')
2017-11-08 17:40:02 +00:00
if (!IsCombinator(op)) AddToWorklist(&*ii);
ADCE: Treat privates like locals in entry point with no calls This is needed for ongoing legalization of HLSL. It allows removal of accesses to textures/buffers that are not used.
2017-10-10 20:35:53 +00:00
// Remember function calls
Re-format files in source, source/opt, source/util, source/val and tools. NFC. This just makes sure every file is formatted following the formatting definition in .clang-format. Re-formatted with: $ clang-format -i $(find source tools include -name '*.cpp') $ clang-format -i $(find source tools include -name '*.h')
2017-11-08 17:40:02 +00:00
if (op == SpvOpFunctionCall) call_in_func_ = true;
Add AggressiveDCEPass Create aggressive dead code elimination pass This pass eliminates unused code from functions. In addition, it detects and eliminates code which may have spurious uses but which do not contribute to the output of the function. The most common cause of such code sequences is summations in loops whose result is no longer used due to dead code elimination. This optimization has additional compile time cost over standard dead code elimination. This pass only processes entry point functions. It also only processes shaders with logical addressing. It currently will not process functions with function calls. It currently only supports the GLSL.std.450 extended instruction set. It currently does not support any extensions. This pass will be made more effective by first running passes that remove dead control flow and inlines function calls. This pass can be especially useful after running Local Access Chain Conversion, which tends to cause cycles of dead code to be left after Store/Load elimination passes are completed. These cycles cannot be eliminated with standard dead code elimination. Additionally: This transform uses a whitelist of instructions that it knows do have side effects, (a.k.a. combinators). It assumes other instructions have side effects: it will not remove them, and assumes they have side effects via their ID operands.
2017-06-08 16:37:21 +00:00
} break;
}
}
}
ADCE: Treat privates like locals in entry point with no calls This is needed for ongoing legalization of HLSL. It allows removal of accesses to textures/buffers that are not used.
2017-10-10 20:35:53 +00:00
// See if current function is an entry point
Re-factor Phi insertion code out of LocalMultiStoreElimPass Including a re-factor of common behaviour into class Pass: The following functions are now in class Pass: - IsLoopHeader. - ComputeStructuredOrder - ComputeStructuredSuccessors (annoyingly, I could not re-factor all instances of this function, the copy in common_uniform_elim_pass.cpp is slightly different and fails with the common implementation). - GetPointeeTypeId - TakeNextId - FinalizeNextId - MergeBlockIdIfAny This is a NFC (non-functional change)
2017-10-25 17:26:25 +00:00
for (auto& ei : get_module()->entry_points()) {
ADCE: Treat privates like locals in entry point with no calls This is needed for ongoing legalization of HLSL. It allows removal of accesses to textures/buffers that are not used.
2017-10-10 20:35:53 +00:00
if (ei.GetSingleWordInOperand(kEntryPointFunctionIdInIdx) ==
func->result_id()) {
func_is_entry_point_ = true;
break;
}
}
// If the current function is an entry point and has no function calls,
// we can optimize private variables as locals
private_like_local_ = func_is_entry_point_ && !call_in_func_;
// If privates are not like local, add their stores to worklist
if (!private_like_local_)
Re-format files in source, source/opt, source/util, source/val and tools. NFC. This just makes sure every file is formatted following the formatting definition in .clang-format. Re-formatted with: $ clang-format -i $(find source tools include -name '*.cpp') $ clang-format -i $(find source tools include -name '*.h')
2017-11-08 17:40:02 +00:00
for (auto& ps : private_stores_) AddToWorklist(ps);
Add AggressiveDCEPass Create aggressive dead code elimination pass This pass eliminates unused code from functions. In addition, it detects and eliminates code which may have spurious uses but which do not contribute to the output of the function. The most common cause of such code sequences is summations in loops whose result is no longer used due to dead code elimination. This optimization has additional compile time cost over standard dead code elimination. This pass only processes entry point functions. It also only processes shaders with logical addressing. It currently will not process functions with function calls. It currently only supports the GLSL.std.450 extended instruction set. It currently does not support any extensions. This pass will be made more effective by first running passes that remove dead control flow and inlines function calls. This pass can be especially useful after running Local Access Chain Conversion, which tends to cause cycles of dead code to be left after Store/Load elimination passes are completed. These cycles cannot be eliminated with standard dead code elimination. Additionally: This transform uses a whitelist of instructions that it knows do have side effects, (a.k.a. combinators). It assumes other instructions have side effects: it will not remove them, and assumes they have side effects via their ID operands.
2017-06-08 16:37:21 +00:00
// Add OpGroupDecorates to worklist because they are a pain to remove
// ids from.
// TODO(greg-lunarg): Handle dead ids in OpGroupDecorate
Re-factor Phi insertion code out of LocalMultiStoreElimPass Including a re-factor of common behaviour into class Pass: The following functions are now in class Pass: - IsLoopHeader. - ComputeStructuredOrder - ComputeStructuredSuccessors (annoyingly, I could not re-factor all instances of this function, the copy in common_uniform_elim_pass.cpp is slightly different and fails with the common implementation). - GetPointeeTypeId - TakeNextId - FinalizeNextId - MergeBlockIdIfAny This is a NFC (non-functional change)
2017-10-25 17:26:25 +00:00
for (auto& ai : get_module()->annotations()) {
Re-format files in source, source/opt, source/util, source/val and tools. NFC. This just makes sure every file is formatted following the formatting definition in .clang-format. Re-formatted with: $ clang-format -i $(find source tools include -name '*.cpp') $ clang-format -i $(find source tools include -name '*.h')
2017-11-08 17:40:02 +00:00
if (ai.opcode() == SpvOpGroupDecorate) AddToWorklist(&ai);
Add AggressiveDCEPass Create aggressive dead code elimination pass This pass eliminates unused code from functions. In addition, it detects and eliminates code which may have spurious uses but which do not contribute to the output of the function. The most common cause of such code sequences is summations in loops whose result is no longer used due to dead code elimination. This optimization has additional compile time cost over standard dead code elimination. This pass only processes entry point functions. It also only processes shaders with logical addressing. It currently will not process functions with function calls. It currently only supports the GLSL.std.450 extended instruction set. It currently does not support any extensions. This pass will be made more effective by first running passes that remove dead control flow and inlines function calls. This pass can be especially useful after running Local Access Chain Conversion, which tends to cause cycles of dead code to be left after Store/Load elimination passes are completed. These cycles cannot be eliminated with standard dead code elimination. Additionally: This transform uses a whitelist of instructions that it knows do have side effects, (a.k.a. combinators). It assumes other instructions have side effects: it will not remove them, and assumes they have side effects via their ID operands.
2017-06-08 16:37:21 +00:00
}
Re-format files in source, source/opt, source/util, source/val and tools. NFC. This just makes sure every file is formatted following the formatting definition in .clang-format. Re-formatted with: $ clang-format -i $(find source tools include -name '*.cpp') $ clang-format -i $(find source tools include -name '*.h')
2017-11-08 17:40:02 +00:00
// Perform closure on live instruction set.
Add AggressiveDCEPass Create aggressive dead code elimination pass This pass eliminates unused code from functions. In addition, it detects and eliminates code which may have spurious uses but which do not contribute to the output of the function. The most common cause of such code sequences is summations in loops whose result is no longer used due to dead code elimination. This optimization has additional compile time cost over standard dead code elimination. This pass only processes entry point functions. It also only processes shaders with logical addressing. It currently will not process functions with function calls. It currently only supports the GLSL.std.450 extended instruction set. It currently does not support any extensions. This pass will be made more effective by first running passes that remove dead control flow and inlines function calls. This pass can be especially useful after running Local Access Chain Conversion, which tends to cause cycles of dead code to be left after Store/Load elimination passes are completed. These cycles cannot be eliminated with standard dead code elimination. Additionally: This transform uses a whitelist of instructions that it knows do have side effects, (a.k.a. combinators). It assumes other instructions have side effects: it will not remove them, and assumes they have side effects via their ID operands.
2017-06-08 16:37:21 +00:00
while (!worklist_.empty()) {
ir::Instruction* liveInst = worklist_.front();
// Add all operand instructions if not already live
liveInst->ForEachInId([this](const uint32_t* iid) {
Re-factor Phi insertion code out of LocalMultiStoreElimPass Including a re-factor of common behaviour into class Pass: The following functions are now in class Pass: - IsLoopHeader. - ComputeStructuredOrder - ComputeStructuredSuccessors (annoyingly, I could not re-factor all instances of this function, the copy in common_uniform_elim_pass.cpp is slightly different and fails with the common implementation). - GetPointeeTypeId - TakeNextId - FinalizeNextId - MergeBlockIdIfAny This is a NFC (non-functional change)
2017-10-25 17:26:25 +00:00
ir::Instruction* inInst = get_def_use_mgr()->GetDef(*iid);
Re-format files in source, source/opt, source/util, source/val and tools. NFC. This just makes sure every file is formatted following the formatting definition in .clang-format. Re-formatted with: $ clang-format -i $(find source tools include -name '*.cpp') $ clang-format -i $(find source tools include -name '*.h')
2017-11-08 17:40:02 +00:00
if (!IsLive(inInst)) AddToWorklist(inInst);
Add AggressiveDCEPass Create aggressive dead code elimination pass This pass eliminates unused code from functions. In addition, it detects and eliminates code which may have spurious uses but which do not contribute to the output of the function. The most common cause of such code sequences is summations in loops whose result is no longer used due to dead code elimination. This optimization has additional compile time cost over standard dead code elimination. This pass only processes entry point functions. It also only processes shaders with logical addressing. It currently will not process functions with function calls. It currently only supports the GLSL.std.450 extended instruction set. It currently does not support any extensions. This pass will be made more effective by first running passes that remove dead control flow and inlines function calls. This pass can be especially useful after running Local Access Chain Conversion, which tends to cause cycles of dead code to be left after Store/Load elimination passes are completed. These cycles cannot be eliminated with standard dead code elimination. Additionally: This transform uses a whitelist of instructions that it knows do have side effects, (a.k.a. combinators). It assumes other instructions have side effects: it will not remove them, and assumes they have side effects via their ID operands.
2017-06-08 16:37:21 +00:00
});
ADCE: Dead if elimination Mark structured conditional branches live only if one or more instructions in their associated construct is marked live. After closure, replace dead structured conditional branches with a branch to its merge and remove dead blocks. ADCE: Dead If Elim: Remove duplicate StructuredOrder code Also generalize ComputeStructuredOrder so that the caller can specify the root block for the order. Phi insertion uses pseudo_entry_block and adce and dead branch elim use the first block of the function. ADCE: Dead If Elim: Pull redundant code out of InsertPhiInstructions ADCE: Dead If Elim: Encapsulate CFG Cleanup Initialization ADCE: Dead If Elim: Remove redundant code from ADCE initialization ADCE: Dead If: Use CFGCleanup to eliminate newly dead blocks Moved bulk of CFG Cleanup code into MemPass.
2017-10-17 22:33:43 +00:00
// If in a structured if construct, add the controlling conditional branch
// and its merge. Any containing if construct is marked live when the
// the merge and branch are processed out of the worklist.
ir::BasicBlock* blk = inst2block_[liveInst];
ir::Instruction* branchInst = block2headerBranch_[blk];
if (branchInst != nullptr && !IsLive(branchInst)) {
AddToWorklist(branchInst);
AddToWorklist(block2headerMerge_[blk]);
}
Add AggressiveDCEPass Create aggressive dead code elimination pass This pass eliminates unused code from functions. In addition, it detects and eliminates code which may have spurious uses but which do not contribute to the output of the function. The most common cause of such code sequences is summations in loops whose result is no longer used due to dead code elimination. This optimization has additional compile time cost over standard dead code elimination. This pass only processes entry point functions. It also only processes shaders with logical addressing. It currently will not process functions with function calls. It currently only supports the GLSL.std.450 extended instruction set. It currently does not support any extensions. This pass will be made more effective by first running passes that remove dead control flow and inlines function calls. This pass can be especially useful after running Local Access Chain Conversion, which tends to cause cycles of dead code to be left after Store/Load elimination passes are completed. These cycles cannot be eliminated with standard dead code elimination. Additionally: This transform uses a whitelist of instructions that it knows do have side effects, (a.k.a. combinators). It assumes other instructions have side effects: it will not remove them, and assumes they have side effects via their ID operands.
2017-06-08 16:37:21 +00:00
// If local load, add all variable's stores if variable not already live
if (liveInst->opcode() == SpvOpLoad) {
uint32_t varId;
Re-format files in source, source/opt, source/util, source/val and tools. NFC. This just makes sure every file is formatted following the formatting definition in .clang-format. Re-formatted with: $ clang-format -i $(find source tools include -name '*.cpp') $ clang-format -i $(find source tools include -name '*.h')
2017-11-08 17:40:02 +00:00
(void)GetPtr(liveInst, &varId);
ADCE: Add support for function calls ADCE will now generate correct code in the presence of function calls. This is needed for opaque type optimization needed by glslang. Currently all function calls are marked as live. TODO: mark calls live only if they write a non-local.
2017-08-04 21:04:37 +00:00
ProcessLoad(varId);
}
// If function call, treat as if it loads from all pointer arguments
else if (liveInst->opcode() == SpvOpFunctionCall) {
liveInst->ForEachInId([this](const uint32_t* iid) {
// Skip non-ptr args
if (!IsPtr(*iid)) return;
uint32_t varId;
Re-format files in source, source/opt, source/util, source/val and tools. NFC. This just makes sure every file is formatted following the formatting definition in .clang-format. Re-formatted with: $ clang-format -i $(find source tools include -name '*.cpp') $ clang-format -i $(find source tools include -name '*.h')
2017-11-08 17:40:02 +00:00
(void)GetPtr(*iid, &varId);
ADCE: Add support for function calls ADCE will now generate correct code in the presence of function calls. This is needed for opaque type optimization needed by glslang. Currently all function calls are marked as live. TODO: mark calls live only if they write a non-local.
2017-08-04 21:04:37 +00:00
ProcessLoad(varId);
});
Add AggressiveDCEPass Create aggressive dead code elimination pass This pass eliminates unused code from functions. In addition, it detects and eliminates code which may have spurious uses but which do not contribute to the output of the function. The most common cause of such code sequences is summations in loops whose result is no longer used due to dead code elimination. This optimization has additional compile time cost over standard dead code elimination. This pass only processes entry point functions. It also only processes shaders with logical addressing. It currently will not process functions with function calls. It currently only supports the GLSL.std.450 extended instruction set. It currently does not support any extensions. This pass will be made more effective by first running passes that remove dead control flow and inlines function calls. This pass can be especially useful after running Local Access Chain Conversion, which tends to cause cycles of dead code to be left after Store/Load elimination passes are completed. These cycles cannot be eliminated with standard dead code elimination. Additionally: This transform uses a whitelist of instructions that it knows do have side effects, (a.k.a. combinators). It assumes other instructions have side effects: it will not remove them, and assumes they have side effects via their ID operands.
2017-06-08 16:37:21 +00:00
}
Opt: Have "size" passes process full entry point call tree. Includes code to deal correctly with OpFunctionParameter. This is needed by opaque propagation which may not exhaustively inline entry point functions. Adds ProcessEntryPointCallTree: a method to do work on the functions in the entry point call trees in a deterministic order.
2017-08-10 22:42:16 +00:00
// If function parameter, treat as if it's result id is loaded from
else if (liveInst->opcode() == SpvOpFunctionParameter) {
ProcessLoad(liveInst->result_id());
}
Add AggressiveDCEPass Create aggressive dead code elimination pass This pass eliminates unused code from functions. In addition, it detects and eliminates code which may have spurious uses but which do not contribute to the output of the function. The most common cause of such code sequences is summations in loops whose result is no longer used due to dead code elimination. This optimization has additional compile time cost over standard dead code elimination. This pass only processes entry point functions. It also only processes shaders with logical addressing. It currently will not process functions with function calls. It currently only supports the GLSL.std.450 extended instruction set. It currently does not support any extensions. This pass will be made more effective by first running passes that remove dead control flow and inlines function calls. This pass can be especially useful after running Local Access Chain Conversion, which tends to cause cycles of dead code to be left after Store/Load elimination passes are completed. These cycles cannot be eliminated with standard dead code elimination. Additionally: This transform uses a whitelist of instructions that it knows do have side effects, (a.k.a. combinators). It assumes other instructions have side effects: it will not remove them, and assumes they have side effects via their ID operands.
2017-06-08 16:37:21 +00:00
worklist_.pop();
}
ADCE: Dead if elimination Mark structured conditional branches live only if one or more instructions in their associated construct is marked live. After closure, replace dead structured conditional branches with a branch to its merge and remove dead blocks. ADCE: Dead If Elim: Remove duplicate StructuredOrder code Also generalize ComputeStructuredOrder so that the caller can specify the root block for the order. Phi insertion uses pseudo_entry_block and adce and dead branch elim use the first block of the function. ADCE: Dead If Elim: Pull redundant code out of InsertPhiInstructions ADCE: Dead If Elim: Encapsulate CFG Cleanup Initialization ADCE: Dead If Elim: Remove redundant code from ADCE initialization ADCE: Dead If: Use CFGCleanup to eliminate newly dead blocks Moved bulk of CFG Cleanup code into MemPass.
2017-10-17 22:33:43 +00:00
// Mark all non-live instructions dead, except branches which are not
// at the end of an if-header, which indicate a dead if.
for (auto bi = structuredOrder.begin(); bi != structuredOrder.end(); ++bi) {
for (auto ii = (*bi)->begin(); ii != (*bi)->end(); ++ii) {
Re-format files in source, source/opt, source/util, source/val and tools. NFC. This just makes sure every file is formatted following the formatting definition in .clang-format. Re-formatted with: $ clang-format -i $(find source tools include -name '*.cpp') $ clang-format -i $(find source tools include -name '*.h')
2017-11-08 17:40:02 +00:00
if (IsLive(&*ii)) continue;
ADCE: Dead if elimination Mark structured conditional branches live only if one or more instructions in their associated construct is marked live. After closure, replace dead structured conditional branches with a branch to its merge and remove dead blocks. ADCE: Dead If Elim: Remove duplicate StructuredOrder code Also generalize ComputeStructuredOrder so that the caller can specify the root block for the order. Phi insertion uses pseudo_entry_block and adce and dead branch elim use the first block of the function. ADCE: Dead If Elim: Pull redundant code out of InsertPhiInstructions ADCE: Dead If Elim: Encapsulate CFG Cleanup Initialization ADCE: Dead If Elim: Remove redundant code from ADCE initialization ADCE: Dead If: Use CFGCleanup to eliminate newly dead blocks Moved bulk of CFG Cleanup code into MemPass.
2017-10-17 22:33:43 +00:00
if (IsBranch(ii->opcode()) &&
!IsStructuredIfHeader(*bi, nullptr, nullptr, nullptr))
continue;
dead_insts_.insert(&*ii);
Add AggressiveDCEPass Create aggressive dead code elimination pass This pass eliminates unused code from functions. In addition, it detects and eliminates code which may have spurious uses but which do not contribute to the output of the function. The most common cause of such code sequences is summations in loops whose result is no longer used due to dead code elimination. This optimization has additional compile time cost over standard dead code elimination. This pass only processes entry point functions. It also only processes shaders with logical addressing. It currently will not process functions with function calls. It currently only supports the GLSL.std.450 extended instruction set. It currently does not support any extensions. This pass will be made more effective by first running passes that remove dead control flow and inlines function calls. This pass can be especially useful after running Local Access Chain Conversion, which tends to cause cycles of dead code to be left after Store/Load elimination passes are completed. These cycles cannot be eliminated with standard dead code elimination. Additionally: This transform uses a whitelist of instructions that it knows do have side effects, (a.k.a. combinators). It assumes other instructions have side effects: it will not remove them, and assumes they have side effects via their ID operands.
2017-06-08 16:37:21 +00:00
}
}
// Remove debug and annotation statements referencing dead instructions.
// This must be done before killing the instructions, otherwise there are
// dead objects in the def/use database.
Re-factor Phi insertion code out of LocalMultiStoreElimPass Including a re-factor of common behaviour into class Pass: The following functions are now in class Pass: - IsLoopHeader. - ComputeStructuredOrder - ComputeStructuredSuccessors (annoyingly, I could not re-factor all instances of this function, the copy in common_uniform_elim_pass.cpp is slightly different and fails with the common implementation). - GetPointeeTypeId - TakeNextId - FinalizeNextId - MergeBlockIdIfAny This is a NFC (non-functional change)
2017-10-25 17:26:25 +00:00
for (auto& di : get_module()->debugs2()) {
Re-format files in source, source/opt, source/util, source/val and tools. NFC. This just makes sure every file is formatted following the formatting definition in .clang-format. Re-formatted with: $ clang-format -i $(find source tools include -name '*.cpp') $ clang-format -i $(find source tools include -name '*.h')
2017-11-08 17:40:02 +00:00
if (di.opcode() != SpvOpName) continue;
if (KillInstIfTargetDead(&di)) modified = true;
Add AggressiveDCEPass Create aggressive dead code elimination pass This pass eliminates unused code from functions. In addition, it detects and eliminates code which may have spurious uses but which do not contribute to the output of the function. The most common cause of such code sequences is summations in loops whose result is no longer used due to dead code elimination. This optimization has additional compile time cost over standard dead code elimination. This pass only processes entry point functions. It also only processes shaders with logical addressing. It currently will not process functions with function calls. It currently only supports the GLSL.std.450 extended instruction set. It currently does not support any extensions. This pass will be made more effective by first running passes that remove dead control flow and inlines function calls. This pass can be especially useful after running Local Access Chain Conversion, which tends to cause cycles of dead code to be left after Store/Load elimination passes are completed. These cycles cannot be eliminated with standard dead code elimination. Additionally: This transform uses a whitelist of instructions that it knows do have side effects, (a.k.a. combinators). It assumes other instructions have side effects: it will not remove them, and assumes they have side effects via their ID operands.
2017-06-08 16:37:21 +00:00
}
Re-factor Phi insertion code out of LocalMultiStoreElimPass Including a re-factor of common behaviour into class Pass: The following functions are now in class Pass: - IsLoopHeader. - ComputeStructuredOrder - ComputeStructuredSuccessors (annoyingly, I could not re-factor all instances of this function, the copy in common_uniform_elim_pass.cpp is slightly different and fails with the common implementation). - GetPointeeTypeId - TakeNextId - FinalizeNextId - MergeBlockIdIfAny This is a NFC (non-functional change)
2017-10-25 17:26:25 +00:00
for (auto& ai : get_module()->annotations()) {
Add AggressiveDCEPass Create aggressive dead code elimination pass This pass eliminates unused code from functions. In addition, it detects and eliminates code which may have spurious uses but which do not contribute to the output of the function. The most common cause of such code sequences is summations in loops whose result is no longer used due to dead code elimination. This optimization has additional compile time cost over standard dead code elimination. This pass only processes entry point functions. It also only processes shaders with logical addressing. It currently will not process functions with function calls. It currently only supports the GLSL.std.450 extended instruction set. It currently does not support any extensions. This pass will be made more effective by first running passes that remove dead control flow and inlines function calls. This pass can be especially useful after running Local Access Chain Conversion, which tends to cause cycles of dead code to be left after Store/Load elimination passes are completed. These cycles cannot be eliminated with standard dead code elimination. Additionally: This transform uses a whitelist of instructions that it knows do have side effects, (a.k.a. combinators). It assumes other instructions have side effects: it will not remove them, and assumes they have side effects via their ID operands.
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if (ai.opcode() != SpvOpDecorate && ai.opcode() != SpvOpDecorateId)
continue;
Re-format files in source, source/opt, source/util, source/val and tools. NFC. This just makes sure every file is formatted following the formatting definition in .clang-format. Re-formatted with: $ clang-format -i $(find source tools include -name '*.cpp') $ clang-format -i $(find source tools include -name '*.h')
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if (KillInstIfTargetDead(&ai)) modified = true;
Add AggressiveDCEPass Create aggressive dead code elimination pass This pass eliminates unused code from functions. In addition, it detects and eliminates code which may have spurious uses but which do not contribute to the output of the function. The most common cause of such code sequences is summations in loops whose result is no longer used due to dead code elimination. This optimization has additional compile time cost over standard dead code elimination. This pass only processes entry point functions. It also only processes shaders with logical addressing. It currently will not process functions with function calls. It currently only supports the GLSL.std.450 extended instruction set. It currently does not support any extensions. This pass will be made more effective by first running passes that remove dead control flow and inlines function calls. This pass can be especially useful after running Local Access Chain Conversion, which tends to cause cycles of dead code to be left after Store/Load elimination passes are completed. These cycles cannot be eliminated with standard dead code elimination. Additionally: This transform uses a whitelist of instructions that it knows do have side effects, (a.k.a. combinators). It assumes other instructions have side effects: it will not remove them, and assumes they have side effects via their ID operands.
2017-06-08 16:37:21 +00:00
}
ADCE: Dead if elimination Mark structured conditional branches live only if one or more instructions in their associated construct is marked live. After closure, replace dead structured conditional branches with a branch to its merge and remove dead blocks. ADCE: Dead If Elim: Remove duplicate StructuredOrder code Also generalize ComputeStructuredOrder so that the caller can specify the root block for the order. Phi insertion uses pseudo_entry_block and adce and dead branch elim use the first block of the function. ADCE: Dead If Elim: Pull redundant code out of InsertPhiInstructions ADCE: Dead If Elim: Encapsulate CFG Cleanup Initialization ADCE: Dead If Elim: Remove redundant code from ADCE initialization ADCE: Dead If: Use CFGCleanup to eliminate newly dead blocks Moved bulk of CFG Cleanup code into MemPass.
2017-10-17 22:33:43 +00:00
// Kill dead instructions and remember dead blocks
for (auto bi = structuredOrder.begin(); bi != structuredOrder.end();) {
uint32_t mergeBlockId = 0;
for (auto ii = (*bi)->begin(); ii != (*bi)->end(); ++ii) {
Re-format files in source, source/opt, source/util, source/val and tools. NFC. This just makes sure every file is formatted following the formatting definition in .clang-format. Re-formatted with: $ clang-format -i $(find source tools include -name '*.cpp') $ clang-format -i $(find source tools include -name '*.h')
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if (dead_insts_.find(&*ii) == dead_insts_.end()) continue;
ADCE: Dead if elimination Mark structured conditional branches live only if one or more instructions in their associated construct is marked live. After closure, replace dead structured conditional branches with a branch to its merge and remove dead blocks. ADCE: Dead If Elim: Remove duplicate StructuredOrder code Also generalize ComputeStructuredOrder so that the caller can specify the root block for the order. Phi insertion uses pseudo_entry_block and adce and dead branch elim use the first block of the function. ADCE: Dead If Elim: Pull redundant code out of InsertPhiInstructions ADCE: Dead If Elim: Encapsulate CFG Cleanup Initialization ADCE: Dead If Elim: Remove redundant code from ADCE initialization ADCE: Dead If: Use CFGCleanup to eliminate newly dead blocks Moved bulk of CFG Cleanup code into MemPass.
2017-10-17 22:33:43 +00:00
// If dead instruction is selection merge, remember merge block
// for new branch at end of block
if (ii->opcode() == SpvOpSelectionMerge)
Re-format files in source, source/opt, source/util, source/val and tools. NFC. This just makes sure every file is formatted following the formatting definition in .clang-format. Re-formatted with: $ clang-format -i $(find source tools include -name '*.cpp') $ clang-format -i $(find source tools include -name '*.h')
2017-11-08 17:40:02 +00:00
mergeBlockId =
ADCE: Dead if elimination Mark structured conditional branches live only if one or more instructions in their associated construct is marked live. After closure, replace dead structured conditional branches with a branch to its merge and remove dead blocks. ADCE: Dead If Elim: Remove duplicate StructuredOrder code Also generalize ComputeStructuredOrder so that the caller can specify the root block for the order. Phi insertion uses pseudo_entry_block and adce and dead branch elim use the first block of the function. ADCE: Dead If Elim: Pull redundant code out of InsertPhiInstructions ADCE: Dead If Elim: Encapsulate CFG Cleanup Initialization ADCE: Dead If Elim: Remove redundant code from ADCE initialization ADCE: Dead If: Use CFGCleanup to eliminate newly dead blocks Moved bulk of CFG Cleanup code into MemPass.
2017-10-17 22:33:43 +00:00
ii->GetSingleWordInOperand(kSelectionMergeMergeBlockIdInIdx);
Add the IRContext (part 2): Add def-use manager This change will move the instances of the def-use manager to the IRContext. This allows it to persists across optimization, and does not have to be rebuilt multiple times. Added test to ensure that the IRContext is validating and invalidating the analyses correctly.
2017-11-02 18:25:48 +00:00
context()->KillInst(&*ii);
Add AggressiveDCEPass Create aggressive dead code elimination pass This pass eliminates unused code from functions. In addition, it detects and eliminates code which may have spurious uses but which do not contribute to the output of the function. The most common cause of such code sequences is summations in loops whose result is no longer used due to dead code elimination. This optimization has additional compile time cost over standard dead code elimination. This pass only processes entry point functions. It also only processes shaders with logical addressing. It currently will not process functions with function calls. It currently only supports the GLSL.std.450 extended instruction set. It currently does not support any extensions. This pass will be made more effective by first running passes that remove dead control flow and inlines function calls. This pass can be especially useful after running Local Access Chain Conversion, which tends to cause cycles of dead code to be left after Store/Load elimination passes are completed. These cycles cannot be eliminated with standard dead code elimination. Additionally: This transform uses a whitelist of instructions that it knows do have side effects, (a.k.a. combinators). It assumes other instructions have side effects: it will not remove them, and assumes they have side effects via their ID operands.
2017-06-08 16:37:21 +00:00
modified = true;
}
ADCE: Dead if elimination Mark structured conditional branches live only if one or more instructions in their associated construct is marked live. After closure, replace dead structured conditional branches with a branch to its merge and remove dead blocks. ADCE: Dead If Elim: Remove duplicate StructuredOrder code Also generalize ComputeStructuredOrder so that the caller can specify the root block for the order. Phi insertion uses pseudo_entry_block and adce and dead branch elim use the first block of the function. ADCE: Dead If Elim: Pull redundant code out of InsertPhiInstructions ADCE: Dead If Elim: Encapsulate CFG Cleanup Initialization ADCE: Dead If Elim: Remove redundant code from ADCE initialization ADCE: Dead If: Use CFGCleanup to eliminate newly dead blocks Moved bulk of CFG Cleanup code into MemPass.
2017-10-17 22:33:43 +00:00
// If a structured if was deleted, add a branch to its merge block,
// and traverse to the merge block, continuing processing there.
// The block still exists as the OpLabel at least is still intact.
if (mergeBlockId != 0) {
AddBranch(mergeBlockId, *bi);
for (++bi; (*bi)->id() != mergeBlockId; ++bi) {
}
Re-format files in source, source/opt, source/util, source/val and tools. NFC. This just makes sure every file is formatted following the formatting definition in .clang-format. Re-formatted with: $ clang-format -i $(find source tools include -name '*.cpp') $ clang-format -i $(find source tools include -name '*.h')
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} else {
ADCE: Dead if elimination Mark structured conditional branches live only if one or more instructions in their associated construct is marked live. After closure, replace dead structured conditional branches with a branch to its merge and remove dead blocks. ADCE: Dead If Elim: Remove duplicate StructuredOrder code Also generalize ComputeStructuredOrder so that the caller can specify the root block for the order. Phi insertion uses pseudo_entry_block and adce and dead branch elim use the first block of the function. ADCE: Dead If Elim: Pull redundant code out of InsertPhiInstructions ADCE: Dead If Elim: Encapsulate CFG Cleanup Initialization ADCE: Dead If Elim: Remove redundant code from ADCE initialization ADCE: Dead If: Use CFGCleanup to eliminate newly dead blocks Moved bulk of CFG Cleanup code into MemPass.
2017-10-17 22:33:43 +00:00
++bi;
}
Add AggressiveDCEPass Create aggressive dead code elimination pass This pass eliminates unused code from functions. In addition, it detects and eliminates code which may have spurious uses but which do not contribute to the output of the function. The most common cause of such code sequences is summations in loops whose result is no longer used due to dead code elimination. This optimization has additional compile time cost over standard dead code elimination. This pass only processes entry point functions. It also only processes shaders with logical addressing. It currently will not process functions with function calls. It currently only supports the GLSL.std.450 extended instruction set. It currently does not support any extensions. This pass will be made more effective by first running passes that remove dead control flow and inlines function calls. This pass can be especially useful after running Local Access Chain Conversion, which tends to cause cycles of dead code to be left after Store/Load elimination passes are completed. These cycles cannot be eliminated with standard dead code elimination. Additionally: This transform uses a whitelist of instructions that it knows do have side effects, (a.k.a. combinators). It assumes other instructions have side effects: it will not remove them, and assumes they have side effects via their ID operands.
2017-06-08 16:37:21 +00:00
}
ADCE: Dead if elimination Mark structured conditional branches live only if one or more instructions in their associated construct is marked live. After closure, replace dead structured conditional branches with a branch to its merge and remove dead blocks. ADCE: Dead If Elim: Remove duplicate StructuredOrder code Also generalize ComputeStructuredOrder so that the caller can specify the root block for the order. Phi insertion uses pseudo_entry_block and adce and dead branch elim use the first block of the function. ADCE: Dead If Elim: Pull redundant code out of InsertPhiInstructions ADCE: Dead If Elim: Encapsulate CFG Cleanup Initialization ADCE: Dead If Elim: Remove redundant code from ADCE initialization ADCE: Dead If: Use CFGCleanup to eliminate newly dead blocks Moved bulk of CFG Cleanup code into MemPass.
2017-10-17 22:33:43 +00:00
// Cleanup all CFG including all unreachable blocks
CFGCleanup(func);
Add AggressiveDCEPass Create aggressive dead code elimination pass This pass eliminates unused code from functions. In addition, it detects and eliminates code which may have spurious uses but which do not contribute to the output of the function. The most common cause of such code sequences is summations in loops whose result is no longer used due to dead code elimination. This optimization has additional compile time cost over standard dead code elimination. This pass only processes entry point functions. It also only processes shaders with logical addressing. It currently will not process functions with function calls. It currently only supports the GLSL.std.450 extended instruction set. It currently does not support any extensions. This pass will be made more effective by first running passes that remove dead control flow and inlines function calls. This pass can be especially useful after running Local Access Chain Conversion, which tends to cause cycles of dead code to be left after Store/Load elimination passes are completed. These cycles cannot be eliminated with standard dead code elimination. Additionally: This transform uses a whitelist of instructions that it knows do have side effects, (a.k.a. combinators). It assumes other instructions have side effects: it will not remove them, and assumes they have side effects via their ID operands.
2017-06-08 16:37:21 +00:00
return modified;
}
Add the IRContext (part 1) This is the first part of adding the IRContext. This class is meant to hold the extra data that is build on top of the module that it owns. The first part will simply create the IRContext class and get it passed to the passes in place of the module. For now it does not have any functionality of its own, but it acts more as a wrapper for the module. The functions that I added to the IRContext are those that either traverse the headers or add to them. I did this because we may decide to have other ways of dealing with these sections (for example adding a type pool, or use the decoration manager). I also added the function that add to the header because the IRContext needs to know when an instruction is added to update other data structures appropriately. Note that there is still lots of work that needs to be done. There are still many places that change the module, and do not inform the context. That will be the next step.
2017-10-30 15:13:24 +00:00
void AggressiveDCEPass::Initialize(ir::IRContext* c) {
InitializeProcessing(c);
Add AggressiveDCEPass Create aggressive dead code elimination pass This pass eliminates unused code from functions. In addition, it detects and eliminates code which may have spurious uses but which do not contribute to the output of the function. The most common cause of such code sequences is summations in loops whose result is no longer used due to dead code elimination. This optimization has additional compile time cost over standard dead code elimination. This pass only processes entry point functions. It also only processes shaders with logical addressing. It currently will not process functions with function calls. It currently only supports the GLSL.std.450 extended instruction set. It currently does not support any extensions. This pass will be made more effective by first running passes that remove dead control flow and inlines function calls. This pass can be especially useful after running Local Access Chain Conversion, which tends to cause cycles of dead code to be left after Store/Load elimination passes are completed. These cycles cannot be eliminated with standard dead code elimination. Additionally: This transform uses a whitelist of instructions that it knows do have side effects, (a.k.a. combinators). It assumes other instructions have side effects: it will not remove them, and assumes they have side effects via their ID operands.
2017-06-08 16:37:21 +00:00
Minor code review feedback on AggressiveDCE
2017-07-10 15:45:59 +00:00
// Clear collections
worklist_ = std::queue<ir::Instruction*>{};
live_insts_.clear();
live_local_vars_.clear();
dead_insts_.clear();
combinator_ops_shader_.clear();
combinator_ops_glsl_std_450_.clear();
Add extension whitelists to size-reduction passes. Currently only SPV_KHR_variable_pointers is disallowed in passes which do pointer analysis. Positive and negative tests of the general extensions mechanism were added to aggressive_dce but cover all passes.
2017-07-19 00:57:26 +00:00
// Initialize extensions whitelist
InitExtensions();
Add AggressiveDCEPass Create aggressive dead code elimination pass This pass eliminates unused code from functions. In addition, it detects and eliminates code which may have spurious uses but which do not contribute to the output of the function. The most common cause of such code sequences is summations in loops whose result is no longer used due to dead code elimination. This optimization has additional compile time cost over standard dead code elimination. This pass only processes entry point functions. It also only processes shaders with logical addressing. It currently will not process functions with function calls. It currently only supports the GLSL.std.450 extended instruction set. It currently does not support any extensions. This pass will be made more effective by first running passes that remove dead control flow and inlines function calls. This pass can be especially useful after running Local Access Chain Conversion, which tends to cause cycles of dead code to be left after Store/Load elimination passes are completed. These cycles cannot be eliminated with standard dead code elimination. Additionally: This transform uses a whitelist of instructions that it knows do have side effects, (a.k.a. combinators). It assumes other instructions have side effects: it will not remove them, and assumes they have side effects via their ID operands.
2017-06-08 16:37:21 +00:00
}
Pass::Status AggressiveDCEPass::ProcessImpl() {
Re-format files in source, source/opt, source/util, source/val and tools. NFC. This just makes sure every file is formatted following the formatting definition in .clang-format. Re-formatted with: $ clang-format -i $(find source tools include -name '*.cpp') $ clang-format -i $(find source tools include -name '*.h')
2017-11-08 17:40:02 +00:00
// Current functionality assumes shader capability
Add AggressiveDCEPass Create aggressive dead code elimination pass This pass eliminates unused code from functions. In addition, it detects and eliminates code which may have spurious uses but which do not contribute to the output of the function. The most common cause of such code sequences is summations in loops whose result is no longer used due to dead code elimination. This optimization has additional compile time cost over standard dead code elimination. This pass only processes entry point functions. It also only processes shaders with logical addressing. It currently will not process functions with function calls. It currently only supports the GLSL.std.450 extended instruction set. It currently does not support any extensions. This pass will be made more effective by first running passes that remove dead control flow and inlines function calls. This pass can be especially useful after running Local Access Chain Conversion, which tends to cause cycles of dead code to be left after Store/Load elimination passes are completed. These cycles cannot be eliminated with standard dead code elimination. Additionally: This transform uses a whitelist of instructions that it knows do have side effects, (a.k.a. combinators). It assumes other instructions have side effects: it will not remove them, and assumes they have side effects via their ID operands.
2017-06-08 16:37:21 +00:00
// TODO(greg-lunarg): Handle additional capabilities
Re-factor Phi insertion code out of LocalMultiStoreElimPass Including a re-factor of common behaviour into class Pass: The following functions are now in class Pass: - IsLoopHeader. - ComputeStructuredOrder - ComputeStructuredSuccessors (annoyingly, I could not re-factor all instances of this function, the copy in common_uniform_elim_pass.cpp is slightly different and fails with the common implementation). - GetPointeeTypeId - TakeNextId - FinalizeNextId - MergeBlockIdIfAny This is a NFC (non-functional change)
2017-10-25 17:26:25 +00:00
if (!get_module()->HasCapability(SpvCapabilityShader))
Add AggressiveDCEPass Create aggressive dead code elimination pass This pass eliminates unused code from functions. In addition, it detects and eliminates code which may have spurious uses but which do not contribute to the output of the function. The most common cause of such code sequences is summations in loops whose result is no longer used due to dead code elimination. This optimization has additional compile time cost over standard dead code elimination. This pass only processes entry point functions. It also only processes shaders with logical addressing. It currently will not process functions with function calls. It currently only supports the GLSL.std.450 extended instruction set. It currently does not support any extensions. This pass will be made more effective by first running passes that remove dead control flow and inlines function calls. This pass can be especially useful after running Local Access Chain Conversion, which tends to cause cycles of dead code to be left after Store/Load elimination passes are completed. These cycles cannot be eliminated with standard dead code elimination. Additionally: This transform uses a whitelist of instructions that it knows do have side effects, (a.k.a. combinators). It assumes other instructions have side effects: it will not remove them, and assumes they have side effects via their ID operands.
2017-06-08 16:37:21 +00:00
return Status::SuccessWithoutChange;
// Current functionality assumes logical addressing only
// TODO(greg-lunarg): Handle non-logical addressing
Re-factor Phi insertion code out of LocalMultiStoreElimPass Including a re-factor of common behaviour into class Pass: The following functions are now in class Pass: - IsLoopHeader. - ComputeStructuredOrder - ComputeStructuredSuccessors (annoyingly, I could not re-factor all instances of this function, the copy in common_uniform_elim_pass.cpp is slightly different and fails with the common implementation). - GetPointeeTypeId - TakeNextId - FinalizeNextId - MergeBlockIdIfAny This is a NFC (non-functional change)
2017-10-25 17:26:25 +00:00
if (get_module()->HasCapability(SpvCapabilityAddresses))
Add AggressiveDCEPass Create aggressive dead code elimination pass This pass eliminates unused code from functions. In addition, it detects and eliminates code which may have spurious uses but which do not contribute to the output of the function. The most common cause of such code sequences is summations in loops whose result is no longer used due to dead code elimination. This optimization has additional compile time cost over standard dead code elimination. This pass only processes entry point functions. It also only processes shaders with logical addressing. It currently will not process functions with function calls. It currently only supports the GLSL.std.450 extended instruction set. It currently does not support any extensions. This pass will be made more effective by first running passes that remove dead control flow and inlines function calls. This pass can be especially useful after running Local Access Chain Conversion, which tends to cause cycles of dead code to be left after Store/Load elimination passes are completed. These cycles cannot be eliminated with standard dead code elimination. Additionally: This transform uses a whitelist of instructions that it knows do have side effects, (a.k.a. combinators). It assumes other instructions have side effects: it will not remove them, and assumes they have side effects via their ID operands.
2017-06-08 16:37:21 +00:00
return Status::SuccessWithoutChange;
Minor code review feedback on AggressiveDCE
2017-07-10 15:45:59 +00:00
// If any extensions in the module are not explicitly supported,
Re-format files in source, source/opt, source/util, source/val and tools. NFC. This just makes sure every file is formatted following the formatting definition in .clang-format. Re-formatted with: $ clang-format -i $(find source tools include -name '*.cpp') $ clang-format -i $(find source tools include -name '*.h')
2017-11-08 17:40:02 +00:00
// return unmodified.
if (!AllExtensionsSupported()) return Status::SuccessWithoutChange;
Add extension whitelists to size-reduction passes. Currently only SPV_KHR_variable_pointers is disallowed in passes which do pointer analysis. Positive and negative tests of the general extensions mechanism were added to aggressive_dce but cover all passes.
2017-07-19 00:57:26 +00:00
// Initialize combinator whitelists
Add AggressiveDCEPass Create aggressive dead code elimination pass This pass eliminates unused code from functions. In addition, it detects and eliminates code which may have spurious uses but which do not contribute to the output of the function. The most common cause of such code sequences is summations in loops whose result is no longer used due to dead code elimination. This optimization has additional compile time cost over standard dead code elimination. This pass only processes entry point functions. It also only processes shaders with logical addressing. It currently will not process functions with function calls. It currently only supports the GLSL.std.450 extended instruction set. It currently does not support any extensions. This pass will be made more effective by first running passes that remove dead control flow and inlines function calls. This pass can be especially useful after running Local Access Chain Conversion, which tends to cause cycles of dead code to be left after Store/Load elimination passes are completed. These cycles cannot be eliminated with standard dead code elimination. Additionally: This transform uses a whitelist of instructions that it knows do have side effects, (a.k.a. combinators). It assumes other instructions have side effects: it will not remove them, and assumes they have side effects via their ID operands.
2017-06-08 16:37:21 +00:00
InitCombinatorSets();
Add extension whitelists to size-reduction passes. Currently only SPV_KHR_variable_pointers is disallowed in passes which do pointer analysis. Positive and negative tests of the general extensions mechanism were added to aggressive_dce but cover all passes.
2017-07-19 00:57:26 +00:00
// Process all entry point functions
Re-format files in source, source/opt, source/util, source/val and tools. NFC. This just makes sure every file is formatted following the formatting definition in .clang-format. Re-formatted with: $ clang-format -i $(find source tools include -name '*.cpp') $ clang-format -i $(find source tools include -name '*.h')
2017-11-08 17:40:02 +00:00
ProcessFunction pfn = [this](ir::Function* fp) { return AggressiveDCE(fp); };
Re-factor Phi insertion code out of LocalMultiStoreElimPass Including a re-factor of common behaviour into class Pass: The following functions are now in class Pass: - IsLoopHeader. - ComputeStructuredOrder - ComputeStructuredSuccessors (annoyingly, I could not re-factor all instances of this function, the copy in common_uniform_elim_pass.cpp is slightly different and fails with the common implementation). - GetPointeeTypeId - TakeNextId - FinalizeNextId - MergeBlockIdIfAny This is a NFC (non-functional change)
2017-10-25 17:26:25 +00:00
bool modified = ProcessEntryPointCallTree(pfn, get_module());
Add AggressiveDCEPass Create aggressive dead code elimination pass This pass eliminates unused code from functions. In addition, it detects and eliminates code which may have spurious uses but which do not contribute to the output of the function. The most common cause of such code sequences is summations in loops whose result is no longer used due to dead code elimination. This optimization has additional compile time cost over standard dead code elimination. This pass only processes entry point functions. It also only processes shaders with logical addressing. It currently will not process functions with function calls. It currently only supports the GLSL.std.450 extended instruction set. It currently does not support any extensions. This pass will be made more effective by first running passes that remove dead control flow and inlines function calls. This pass can be especially useful after running Local Access Chain Conversion, which tends to cause cycles of dead code to be left after Store/Load elimination passes are completed. These cycles cannot be eliminated with standard dead code elimination. Additionally: This transform uses a whitelist of instructions that it knows do have side effects, (a.k.a. combinators). It assumes other instructions have side effects: it will not remove them, and assumes they have side effects via their ID operands.
2017-06-08 16:37:21 +00:00
return modified ? Status::SuccessWithChange : Status::SuccessWithoutChange;
}
Add MemPass, move all shared functions to it.
2017-07-27 19:30:12 +00:00
AggressiveDCEPass::AggressiveDCEPass() {}
Add AggressiveDCEPass Create aggressive dead code elimination pass This pass eliminates unused code from functions. In addition, it detects and eliminates code which may have spurious uses but which do not contribute to the output of the function. The most common cause of such code sequences is summations in loops whose result is no longer used due to dead code elimination. This optimization has additional compile time cost over standard dead code elimination. This pass only processes entry point functions. It also only processes shaders with logical addressing. It currently will not process functions with function calls. It currently only supports the GLSL.std.450 extended instruction set. It currently does not support any extensions. This pass will be made more effective by first running passes that remove dead control flow and inlines function calls. This pass can be especially useful after running Local Access Chain Conversion, which tends to cause cycles of dead code to be left after Store/Load elimination passes are completed. These cycles cannot be eliminated with standard dead code elimination. Additionally: This transform uses a whitelist of instructions that it knows do have side effects, (a.k.a. combinators). It assumes other instructions have side effects: it will not remove them, and assumes they have side effects via their ID operands.
2017-06-08 16:37:21 +00:00
Add the IRContext (part 1) This is the first part of adding the IRContext. This class is meant to hold the extra data that is build on top of the module that it owns. The first part will simply create the IRContext class and get it passed to the passes in place of the module. For now it does not have any functionality of its own, but it acts more as a wrapper for the module. The functions that I added to the IRContext are those that either traverse the headers or add to them. I did this because we may decide to have other ways of dealing with these sections (for example adding a type pool, or use the decoration manager). I also added the function that add to the header because the IRContext needs to know when an instruction is added to update other data structures appropriately. Note that there is still lots of work that needs to be done. There are still many places that change the module, and do not inform the context. That will be the next step.
2017-10-30 15:13:24 +00:00
Pass::Status AggressiveDCEPass::Process(ir::IRContext* c) {
Initialize(c);
Add AggressiveDCEPass Create aggressive dead code elimination pass This pass eliminates unused code from functions. In addition, it detects and eliminates code which may have spurious uses but which do not contribute to the output of the function. The most common cause of such code sequences is summations in loops whose result is no longer used due to dead code elimination. This optimization has additional compile time cost over standard dead code elimination. This pass only processes entry point functions. It also only processes shaders with logical addressing. It currently will not process functions with function calls. It currently only supports the GLSL.std.450 extended instruction set. It currently does not support any extensions. This pass will be made more effective by first running passes that remove dead control flow and inlines function calls. This pass can be especially useful after running Local Access Chain Conversion, which tends to cause cycles of dead code to be left after Store/Load elimination passes are completed. These cycles cannot be eliminated with standard dead code elimination. Additionally: This transform uses a whitelist of instructions that it knows do have side effects, (a.k.a. combinators). It assumes other instructions have side effects: it will not remove them, and assumes they have side effects via their ID operands.
2017-06-08 16:37:21 +00:00
return ProcessImpl();
}
void AggressiveDCEPass::InitCombinatorSets() {
combinator_ops_shader_ = {
Re-format files in source, source/opt, source/util, source/val and tools. NFC. This just makes sure every file is formatted following the formatting definition in .clang-format. Re-formatted with: $ clang-format -i $(find source tools include -name '*.cpp') $ clang-format -i $(find source tools include -name '*.h')
2017-11-08 17:40:02 +00:00
SpvOpNop,
SpvOpUndef,
SpvOpVariable,
SpvOpImageTexelPointer,
SpvOpLoad,
SpvOpAccessChain,
SpvOpInBoundsAccessChain,
SpvOpArrayLength,
SpvOpVectorExtractDynamic,
SpvOpVectorInsertDynamic,
SpvOpVectorShuffle,
SpvOpCompositeConstruct,
SpvOpCompositeExtract,
SpvOpCompositeInsert,
SpvOpCopyObject,
SpvOpTranspose,
SpvOpSampledImage,
SpvOpImageSampleImplicitLod,
SpvOpImageSampleExplicitLod,
SpvOpImageSampleDrefImplicitLod,
SpvOpImageSampleDrefExplicitLod,
SpvOpImageSampleProjImplicitLod,
SpvOpImageSampleProjExplicitLod,
SpvOpImageSampleProjDrefImplicitLod,
SpvOpImageSampleProjDrefExplicitLod,
SpvOpImageFetch,
SpvOpImageGather,
SpvOpImageDrefGather,
SpvOpImageRead,
SpvOpImage,
SpvOpConvertFToU,
SpvOpConvertFToS,
SpvOpConvertSToF,
SpvOpConvertUToF,
SpvOpUConvert,
SpvOpSConvert,
SpvOpFConvert,
SpvOpQuantizeToF16,
SpvOpBitcast,
SpvOpSNegate,
SpvOpFNegate,
SpvOpIAdd,
SpvOpFAdd,
SpvOpISub,
SpvOpFSub,
SpvOpIMul,
SpvOpFMul,
SpvOpUDiv,
SpvOpSDiv,
SpvOpFDiv,
SpvOpUMod,
SpvOpSRem,
SpvOpSMod,
SpvOpFRem,
SpvOpFMod,
SpvOpVectorTimesScalar,
SpvOpMatrixTimesScalar,
SpvOpVectorTimesMatrix,
SpvOpMatrixTimesVector,
SpvOpMatrixTimesMatrix,
SpvOpOuterProduct,
SpvOpDot,
SpvOpIAddCarry,
SpvOpISubBorrow,
SpvOpUMulExtended,
SpvOpSMulExtended,
SpvOpAny,
SpvOpAll,
SpvOpIsNan,
SpvOpIsInf,
SpvOpLogicalEqual,
SpvOpLogicalNotEqual,
SpvOpLogicalOr,
SpvOpLogicalAnd,
SpvOpLogicalNot,
SpvOpSelect,
SpvOpIEqual,
SpvOpINotEqual,
SpvOpUGreaterThan,
SpvOpSGreaterThan,
SpvOpUGreaterThanEqual,
SpvOpSGreaterThanEqual,
SpvOpULessThan,
SpvOpSLessThan,
SpvOpULessThanEqual,
SpvOpSLessThanEqual,
SpvOpFOrdEqual,
SpvOpFUnordEqual,
SpvOpFOrdNotEqual,
SpvOpFUnordNotEqual,
SpvOpFOrdLessThan,
SpvOpFUnordLessThan,
SpvOpFOrdGreaterThan,
SpvOpFUnordGreaterThan,
SpvOpFOrdLessThanEqual,
SpvOpFUnordLessThanEqual,
SpvOpFOrdGreaterThanEqual,
SpvOpFUnordGreaterThanEqual,
SpvOpShiftRightLogical,
SpvOpShiftRightArithmetic,
SpvOpShiftLeftLogical,
SpvOpBitwiseOr,
SpvOpBitwiseXor,
SpvOpBitwiseAnd,
SpvOpNot,
SpvOpBitFieldInsert,
SpvOpBitFieldSExtract,
SpvOpBitFieldUExtract,
SpvOpBitReverse,
SpvOpBitCount,
SpvOpDPdx,
SpvOpDPdy,
SpvOpFwidth,
SpvOpDPdxFine,
SpvOpDPdyFine,
SpvOpFwidthFine,
SpvOpDPdxCoarse,
SpvOpDPdyCoarse,
SpvOpFwidthCoarse,
SpvOpPhi,
SpvOpImageSparseSampleImplicitLod,
SpvOpImageSparseSampleExplicitLod,
SpvOpImageSparseSampleDrefImplicitLod,
SpvOpImageSparseSampleDrefExplicitLod,
SpvOpImageSparseSampleProjImplicitLod,
SpvOpImageSparseSampleProjExplicitLod,
SpvOpImageSparseSampleProjDrefImplicitLod,
SpvOpImageSparseSampleProjDrefExplicitLod,
SpvOpImageSparseFetch,
SpvOpImageSparseGather,
SpvOpImageSparseDrefGather,
SpvOpImageSparseTexelsResident,
SpvOpImageSparseRead,
SpvOpSizeOf
// TODO(dneto): Add instructions enabled by ImageQuery
Add AggressiveDCEPass Create aggressive dead code elimination pass This pass eliminates unused code from functions. In addition, it detects and eliminates code which may have spurious uses but which do not contribute to the output of the function. The most common cause of such code sequences is summations in loops whose result is no longer used due to dead code elimination. This optimization has additional compile time cost over standard dead code elimination. This pass only processes entry point functions. It also only processes shaders with logical addressing. It currently will not process functions with function calls. It currently only supports the GLSL.std.450 extended instruction set. It currently does not support any extensions. This pass will be made more effective by first running passes that remove dead control flow and inlines function calls. This pass can be especially useful after running Local Access Chain Conversion, which tends to cause cycles of dead code to be left after Store/Load elimination passes are completed. These cycles cannot be eliminated with standard dead code elimination. Additionally: This transform uses a whitelist of instructions that it knows do have side effects, (a.k.a. combinators). It assumes other instructions have side effects: it will not remove them, and assumes they have side effects via their ID operands.
2017-06-08 16:37:21 +00:00
};
// Find supported extension instruction set ids
Re-factor Phi insertion code out of LocalMultiStoreElimPass Including a re-factor of common behaviour into class Pass: The following functions are now in class Pass: - IsLoopHeader. - ComputeStructuredOrder - ComputeStructuredSuccessors (annoyingly, I could not re-factor all instances of this function, the copy in common_uniform_elim_pass.cpp is slightly different and fails with the common implementation). - GetPointeeTypeId - TakeNextId - FinalizeNextId - MergeBlockIdIfAny This is a NFC (non-functional change)
2017-10-25 17:26:25 +00:00
glsl_std_450_id_ = get_module()->GetExtInstImportId("GLSL.std.450");
Add AggressiveDCEPass Create aggressive dead code elimination pass This pass eliminates unused code from functions. In addition, it detects and eliminates code which may have spurious uses but which do not contribute to the output of the function. The most common cause of such code sequences is summations in loops whose result is no longer used due to dead code elimination. This optimization has additional compile time cost over standard dead code elimination. This pass only processes entry point functions. It also only processes shaders with logical addressing. It currently will not process functions with function calls. It currently only supports the GLSL.std.450 extended instruction set. It currently does not support any extensions. This pass will be made more effective by first running passes that remove dead control flow and inlines function calls. This pass can be especially useful after running Local Access Chain Conversion, which tends to cause cycles of dead code to be left after Store/Load elimination passes are completed. These cycles cannot be eliminated with standard dead code elimination. Additionally: This transform uses a whitelist of instructions that it knows do have side effects, (a.k.a. combinators). It assumes other instructions have side effects: it will not remove them, and assumes they have side effects via their ID operands.
2017-06-08 16:37:21 +00:00
Re-format files in source, source/opt, source/util, source/val and tools. NFC. This just makes sure every file is formatted following the formatting definition in .clang-format. Re-formatted with: $ clang-format -i $(find source tools include -name '*.cpp') $ clang-format -i $(find source tools include -name '*.h')
2017-11-08 17:40:02 +00:00
combinator_ops_glsl_std_450_ = {GLSLstd450Round,
GLSLstd450RoundEven,
GLSLstd450Trunc,
GLSLstd450FAbs,
GLSLstd450SAbs,
GLSLstd450FSign,
GLSLstd450SSign,
GLSLstd450Floor,
GLSLstd450Ceil,
GLSLstd450Fract,
GLSLstd450Radians,
GLSLstd450Degrees,
GLSLstd450Sin,
GLSLstd450Cos,
GLSLstd450Tan,
GLSLstd450Asin,
GLSLstd450Acos,
GLSLstd450Atan,
GLSLstd450Sinh,
GLSLstd450Cosh,
GLSLstd450Tanh,
GLSLstd450Asinh,
GLSLstd450Acosh,
GLSLstd450Atanh,
GLSLstd450Atan2,
GLSLstd450Pow,
GLSLstd450Exp,
GLSLstd450Log,
GLSLstd450Exp2,
GLSLstd450Log2,
GLSLstd450Sqrt,
GLSLstd450InverseSqrt,
GLSLstd450Determinant,
GLSLstd450MatrixInverse,
GLSLstd450ModfStruct,
GLSLstd450FMin,
GLSLstd450UMin,
GLSLstd450SMin,
GLSLstd450FMax,
GLSLstd450UMax,
GLSLstd450SMax,
GLSLstd450FClamp,
GLSLstd450UClamp,
GLSLstd450SClamp,
GLSLstd450FMix,
GLSLstd450IMix,
GLSLstd450Step,
GLSLstd450SmoothStep,
GLSLstd450Fma,
GLSLstd450FrexpStruct,
GLSLstd450Ldexp,
GLSLstd450PackSnorm4x8,
GLSLstd450PackUnorm4x8,
GLSLstd450PackSnorm2x16,
GLSLstd450PackUnorm2x16,
GLSLstd450PackHalf2x16,
GLSLstd450PackDouble2x32,
GLSLstd450UnpackSnorm2x16,
GLSLstd450UnpackUnorm2x16,
GLSLstd450UnpackHalf2x16,
GLSLstd450UnpackSnorm4x8,
GLSLstd450UnpackUnorm4x8,
GLSLstd450UnpackDouble2x32,
GLSLstd450Length,
GLSLstd450Distance,
GLSLstd450Cross,
GLSLstd450Normalize,
GLSLstd450FaceForward,
GLSLstd450Reflect,
GLSLstd450Refract,
GLSLstd450FindILsb,
GLSLstd450FindSMsb,
GLSLstd450FindUMsb,
GLSLstd450InterpolateAtCentroid,
GLSLstd450InterpolateAtSample,
GLSLstd450InterpolateAtOffset,
GLSLstd450NMin,
GLSLstd450NMax,
GLSLstd450NClamp};
Add AggressiveDCEPass Create aggressive dead code elimination pass This pass eliminates unused code from functions. In addition, it detects and eliminates code which may have spurious uses but which do not contribute to the output of the function. The most common cause of such code sequences is summations in loops whose result is no longer used due to dead code elimination. This optimization has additional compile time cost over standard dead code elimination. This pass only processes entry point functions. It also only processes shaders with logical addressing. It currently will not process functions with function calls. It currently only supports the GLSL.std.450 extended instruction set. It currently does not support any extensions. This pass will be made more effective by first running passes that remove dead control flow and inlines function calls. This pass can be especially useful after running Local Access Chain Conversion, which tends to cause cycles of dead code to be left after Store/Load elimination passes are completed. These cycles cannot be eliminated with standard dead code elimination. Additionally: This transform uses a whitelist of instructions that it knows do have side effects, (a.k.a. combinators). It assumes other instructions have side effects: it will not remove them, and assumes they have side effects via their ID operands.
2017-06-08 16:37:21 +00:00
}
Add extension whitelists to size-reduction passes. Currently only SPV_KHR_variable_pointers is disallowed in passes which do pointer analysis. Positive and negative tests of the general extensions mechanism were added to aggressive_dce but cover all passes.
2017-07-19 00:57:26 +00:00
void AggressiveDCEPass::InitExtensions() {
extensions_whitelist_.clear();
extensions_whitelist_.insert({
Re-format files in source, source/opt, source/util, source/val and tools. NFC. This just makes sure every file is formatted following the formatting definition in .clang-format. Re-formatted with: $ clang-format -i $(find source tools include -name '*.cpp') $ clang-format -i $(find source tools include -name '*.h')
2017-11-08 17:40:02 +00:00
"SPV_AMD_shader_explicit_vertex_parameter",
"SPV_AMD_shader_trinary_minmax", "SPV_AMD_gcn_shader",
"SPV_KHR_shader_ballot", "SPV_AMD_shader_ballot",
"SPV_AMD_gpu_shader_half_float", "SPV_KHR_shader_draw_parameters",
"SPV_KHR_subgroup_vote", "SPV_KHR_16bit_storage", "SPV_KHR_device_group",
"SPV_KHR_multiview", "SPV_NVX_multiview_per_view_attributes",
"SPV_NV_viewport_array2", "SPV_NV_stereo_view_rendering",
"SPV_NV_sample_mask_override_coverage",
"SPV_NV_geometry_shader_passthrough", "SPV_AMD_texture_gather_bias_lod",
"SPV_KHR_storage_buffer_storage_class",
// SPV_KHR_variable_pointers
// Currently do not support extended pointer expressions
"SPV_AMD_gpu_shader_int16", "SPV_KHR_post_depth_coverage",
"SPV_KHR_shader_atomic_counter_ops",
Add extension whitelists to size-reduction passes. Currently only SPV_KHR_variable_pointers is disallowed in passes which do pointer analysis. Positive and negative tests of the general extensions mechanism were added to aggressive_dce but cover all passes.
2017-07-19 00:57:26 +00:00
});
}
Add AggressiveDCEPass Create aggressive dead code elimination pass This pass eliminates unused code from functions. In addition, it detects and eliminates code which may have spurious uses but which do not contribute to the output of the function. The most common cause of such code sequences is summations in loops whose result is no longer used due to dead code elimination. This optimization has additional compile time cost over standard dead code elimination. This pass only processes entry point functions. It also only processes shaders with logical addressing. It currently will not process functions with function calls. It currently only supports the GLSL.std.450 extended instruction set. It currently does not support any extensions. This pass will be made more effective by first running passes that remove dead control flow and inlines function calls. This pass can be especially useful after running Local Access Chain Conversion, which tends to cause cycles of dead code to be left after Store/Load elimination passes are completed. These cycles cannot be eliminated with standard dead code elimination. Additionally: This transform uses a whitelist of instructions that it knows do have side effects, (a.k.a. combinators). It assumes other instructions have side effects: it will not remove them, and assumes they have side effects via their ID operands.
2017-06-08 16:37:21 +00:00
} // namespace opt
} // namespace spvtools
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