mirror of
https://github.com/KhronosGroup/SPIRV-Tools
synced 2024-12-18 06:01:03 +00:00
b4c4da3e76
* No longer blindly add global non-semantic info instructions to global
types and values
* functions now have a list of non-semantic instructions that succeed
them in the global scope
* global non-semantic instructions go in global types and values if
they appear before any function, otherwise they are attached to the
immediate function predecessor in the module
* changed ADCE to use the function removal utility
* Modified EliminateFunction to have special handling for non-semantic
instructions in the global scope
* non-semantic instructions are moved to an earlier function (or full
global set) if the function they are attached to is eliminated
* Added IRContext::KillNonSemanticInfo to remove the tree of
non-semantic instructions that use an instruction
* this is used in function elimination
* There is still significant work in the optimizer to handle
non-semantic instructions fully in the optimizer
59 lines
2.1 KiB
C++
59 lines
2.1 KiB
C++
// Copyright (c) 2019 Google LLC
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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#include "eliminate_dead_functions_util.h"
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namespace spvtools {
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namespace opt {
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namespace eliminatedeadfunctionsutil {
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Module::iterator EliminateFunction(IRContext* context,
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Module::iterator* func_iter) {
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bool first_func = *func_iter == context->module()->begin();
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bool seen_func_end = false;
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(*func_iter)
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->ForEachInst(
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[context, first_func, func_iter, &seen_func_end](Instruction* inst) {
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if (inst->opcode() == SpvOpFunctionEnd) {
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seen_func_end = true;
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}
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// Move non-semantic instructions to the previous function or
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// global values if this is the first function.
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if (seen_func_end && inst->opcode() == SpvOpExtInst) {
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assert(inst->IsNonSemanticInstruction());
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std::unique_ptr<Instruction> clone(inst->Clone(context));
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context->ForgetUses(inst);
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context->AnalyzeDefUse(clone.get());
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if (first_func) {
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context->AddGlobalValue(std::move(clone));
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} else {
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auto prev_func_iter = *func_iter;
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--prev_func_iter;
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prev_func_iter->AddNonSemanticInstruction(std::move(clone));
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}
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inst->ToNop();
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} else {
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context->KillNonSemanticInfo(inst);
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context->KillInst(inst);
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}
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},
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true, true);
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return func_iter->Erase();
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}
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} // namespace eliminatedeadfunctionsutil
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} // namespace opt
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} // namespace spvtools
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