mirror of
https://github.com/KhronosGroup/SPIRV-Tools
synced 2024-11-30 15:00:06 +00:00
235 lines
7.4 KiB
C++
235 lines
7.4 KiB
C++
// Copyright (c) 2017 The Khronos Group Inc.
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// Copyright (c) 2017 Valve Corporation
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// Copyright (c) 2017 LunarG Inc.
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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 "local_single_block_elim_pass.h"
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#include "iterator.h"
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namespace spvtools {
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namespace opt {
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namespace {
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const uint32_t kStoreValIdInIdx = 1;
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} // anonymous namespace
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bool LocalSingleBlockLoadStoreElimPass::HasOnlySupportedRefs(uint32_t ptrId) {
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if (supported_ref_ptrs_.find(ptrId) != supported_ref_ptrs_.end())
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return true;
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analysis::UseList* uses = def_use_mgr_->GetUses(ptrId);
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assert(uses != nullptr);
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for (auto u : *uses) {
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SpvOp op = u.inst->opcode();
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if (IsNonPtrAccessChain(op) || op == SpvOpCopyObject) {
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if (!HasOnlySupportedRefs(u.inst->result_id())) return false;
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} else if (op != SpvOpStore && op != SpvOpLoad && op != SpvOpName &&
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!IsNonTypeDecorate(op))
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return false;
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}
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supported_ref_ptrs_.insert(ptrId);
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return true;
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}
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bool LocalSingleBlockLoadStoreElimPass::LocalSingleBlockLoadStoreElim(
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ir::Function* func) {
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// Perform local store/load and load/load elimination on each block
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bool modified = false;
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for (auto bi = func->begin(); bi != func->end(); ++bi) {
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var2store_.clear();
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var2load_.clear();
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pinned_vars_.clear();
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for (auto ii = bi->begin(); ii != bi->end(); ++ii) {
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switch (ii->opcode()) {
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case SpvOpStore: {
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// Verify store variable is target type
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uint32_t varId;
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ir::Instruction* ptrInst = GetPtr(&*ii, &varId);
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if (!IsTargetVar(varId))
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continue;
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if (!HasOnlySupportedRefs(varId))
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continue;
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// Register the store
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if (ptrInst->opcode() == SpvOpVariable) {
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// if not pinned, look for WAW
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if (pinned_vars_.find(varId) == pinned_vars_.end()) {
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auto si = var2store_.find(varId);
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if (si != var2store_.end()) {
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def_use_mgr_->KillInst(si->second);
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}
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}
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var2store_[varId] = &*ii;
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}
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else {
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assert(IsNonPtrAccessChain(ptrInst->opcode()));
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var2store_.erase(varId);
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}
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pinned_vars_.erase(varId);
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var2load_.erase(varId);
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} break;
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case SpvOpLoad: {
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// Verify store variable is target type
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uint32_t varId;
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ir::Instruction* ptrInst = GetPtr(&*ii, &varId);
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if (!IsTargetVar(varId))
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continue;
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if (!HasOnlySupportedRefs(varId))
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continue;
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// Look for previous store or load
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uint32_t replId = 0;
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if (ptrInst->opcode() == SpvOpVariable) {
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auto si = var2store_.find(varId);
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if (si != var2store_.end()) {
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replId = si->second->GetSingleWordInOperand(kStoreValIdInIdx);
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}
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else {
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auto li = var2load_.find(varId);
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if (li != var2load_.end()) {
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replId = li->second->result_id();
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}
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}
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}
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if (replId != 0) {
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// replace load's result id and delete load
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ReplaceAndDeleteLoad(&*ii, replId);
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modified = true;
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}
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else {
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if (ptrInst->opcode() == SpvOpVariable)
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var2load_[varId] = &*ii; // register load
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pinned_vars_.insert(varId);
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}
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} break;
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case SpvOpFunctionCall: {
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// Conservatively assume all locals are redefined for now.
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// TODO(): Handle more optimally
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var2store_.clear();
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var2load_.clear();
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pinned_vars_.clear();
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} break;
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default:
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break;
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}
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}
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// Go back and delete useless stores in block
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// TODO(greg-lunarg): Consider moving DCE into separate pass
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for (auto ii = bi->begin(); ii != bi->end(); ++ii) {
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if (ii->opcode() != SpvOpStore)
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continue;
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if (IsLiveStore(&*ii))
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continue;
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DCEInst(&*ii);
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}
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}
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return modified;
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}
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void LocalSingleBlockLoadStoreElimPass::Initialize(ir::Module* module) {
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module_ = module;
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// Initialize Target Type Caches
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seen_target_vars_.clear();
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seen_non_target_vars_.clear();
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// Clear collections
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supported_ref_ptrs_.clear();
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// TODO(greg-lunarg): Reuse def/use from previous passes
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def_use_mgr_.reset(new analysis::DefUseManager(consumer(), module_));
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// Start new ids with next availablein module
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InitNextId();
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// Initialize extensions whitelist
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InitExtensions();
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};
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bool LocalSingleBlockLoadStoreElimPass::AllExtensionsSupported() const {
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// If any extension not in whitelist, return false
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for (auto& ei : module_->extensions()) {
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const char* extName = reinterpret_cast<const char*>(
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&ei.GetInOperand(0).words[0]);
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if (extensions_whitelist_.find(extName) == extensions_whitelist_.end())
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return false;
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}
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return true;
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}
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Pass::Status LocalSingleBlockLoadStoreElimPass::ProcessImpl() {
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// Assumes logical addressing only
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if (module_->HasCapability(SpvCapabilityAddresses))
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return Status::SuccessWithoutChange;
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// Do not process if module contains OpGroupDecorate. Additional
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// support required in KillNamesAndDecorates().
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// TODO(greg-lunarg): Add support for OpGroupDecorate
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for (auto& ai : module_->annotations())
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if (ai.opcode() == SpvOpGroupDecorate)
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return Status::SuccessWithoutChange;
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// If any extensions in the module are not explicitly supported,
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// return unmodified.
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if (!AllExtensionsSupported())
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return Status::SuccessWithoutChange;
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// Collect all named and decorated ids
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FindNamedOrDecoratedIds();
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// Process all entry point functions
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ProcessFunction pfn = [this](ir::Function* fp) {
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return LocalSingleBlockLoadStoreElim(fp);
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};
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bool modified = ProcessEntryPointCallTree(pfn, module_);
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FinalizeNextId();
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return modified ? Status::SuccessWithChange : Status::SuccessWithoutChange;
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}
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LocalSingleBlockLoadStoreElimPass::LocalSingleBlockLoadStoreElimPass() {}
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Pass::Status LocalSingleBlockLoadStoreElimPass::Process(ir::Module* module) {
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Initialize(module);
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return ProcessImpl();
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}
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void LocalSingleBlockLoadStoreElimPass::InitExtensions() {
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extensions_whitelist_.clear();
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extensions_whitelist_.insert({
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"SPV_AMD_shader_explicit_vertex_parameter",
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"SPV_AMD_shader_trinary_minmax",
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"SPV_AMD_gcn_shader",
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"SPV_KHR_shader_ballot",
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"SPV_AMD_shader_ballot",
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"SPV_AMD_gpu_shader_half_float",
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"SPV_KHR_shader_draw_parameters",
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"SPV_KHR_subgroup_vote",
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"SPV_KHR_16bit_storage",
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"SPV_KHR_device_group",
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"SPV_KHR_multiview",
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"SPV_NVX_multiview_per_view_attributes",
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"SPV_NV_viewport_array2",
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"SPV_NV_stereo_view_rendering",
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"SPV_NV_sample_mask_override_coverage",
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"SPV_NV_geometry_shader_passthrough",
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"SPV_AMD_texture_gather_bias_lod",
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"SPV_KHR_storage_buffer_storage_class",
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// SPV_KHR_variable_pointers
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// Currently do not support extended pointer expressions
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"SPV_AMD_gpu_shader_int16",
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"SPV_KHR_post_depth_coverage",
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"SPV_KHR_shader_atomic_counter_ops",
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});
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}
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} // namespace opt
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} // namespace spvtools
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