mirror of
https://github.com/KhronosGroup/SPIRV-Tools
synced 2024-10-19 03:20:14 +00:00
82663f34c9
Merge return assumes that the only unreachable blocks are those needed to keep the structured cfg valid. Even those must be essentially empty blocks. If this is not the case, we get unpredictable behaviour. This commit add a check in merge return, and emits an error if it is not the case. Added a pass of dead branch elimination before merge return in both the performance and size passes. It is a precondition of merge return. Fixes #1962.
655 lines
24 KiB
C++
655 lines
24 KiB
C++
// Copyright (c) 2017 Google 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 "source/opt/ir_context.h"
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#include <cstring>
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#include "source/latest_version_glsl_std_450_header.h"
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#include "source/opt/log.h"
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#include "source/opt/mem_pass.h"
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#include "source/opt/reflect.h"
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namespace spvtools {
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namespace opt {
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void IRContext::BuildInvalidAnalyses(IRContext::Analysis set) {
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if (set & kAnalysisDefUse) {
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BuildDefUseManager();
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}
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if (set & kAnalysisInstrToBlockMapping) {
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BuildInstrToBlockMapping();
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}
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if (set & kAnalysisDecorations) {
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BuildDecorationManager();
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}
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if (set & kAnalysisCFG) {
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BuildCFG();
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}
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if (set & kAnalysisDominatorAnalysis) {
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ResetDominatorAnalysis();
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}
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if (set & kAnalysisLoopAnalysis) {
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ResetLoopAnalysis();
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}
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if (set & kAnalysisNameMap) {
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BuildIdToNameMap();
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}
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if (set & kAnalysisScalarEvolution) {
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BuildScalarEvolutionAnalysis();
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}
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if (set & kAnalysisRegisterPressure) {
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BuildRegPressureAnalysis();
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}
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if (set & kAnalysisValueNumberTable) {
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BuildValueNumberTable();
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}
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if (set & kAnalysisStructuredCFG) {
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BuildStructuredCFGAnalysis();
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}
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}
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void IRContext::InvalidateAnalysesExceptFor(
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IRContext::Analysis preserved_analyses) {
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uint32_t analyses_to_invalidate = valid_analyses_ & (~preserved_analyses);
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InvalidateAnalyses(static_cast<IRContext::Analysis>(analyses_to_invalidate));
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}
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void IRContext::InvalidateAnalyses(IRContext::Analysis analyses_to_invalidate) {
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if (analyses_to_invalidate & kAnalysisDefUse) {
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def_use_mgr_.reset(nullptr);
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}
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if (analyses_to_invalidate & kAnalysisInstrToBlockMapping) {
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instr_to_block_.clear();
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}
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if (analyses_to_invalidate & kAnalysisDecorations) {
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decoration_mgr_.reset(nullptr);
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}
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if (analyses_to_invalidate & kAnalysisCombinators) {
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combinator_ops_.clear();
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}
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if (analyses_to_invalidate & kAnalysisCFG) {
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cfg_.reset(nullptr);
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}
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if (analyses_to_invalidate & kAnalysisDominatorAnalysis) {
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dominator_trees_.clear();
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post_dominator_trees_.clear();
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}
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if (analyses_to_invalidate & kAnalysisNameMap) {
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id_to_name_.reset(nullptr);
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}
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if (analyses_to_invalidate & kAnalysisValueNumberTable) {
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vn_table_.reset(nullptr);
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}
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if (analyses_to_invalidate & kAnalysisStructuredCFG) {
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struct_cfg_analysis_.reset(nullptr);
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}
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valid_analyses_ = Analysis(valid_analyses_ & ~analyses_to_invalidate);
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}
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Instruction* IRContext::KillInst(Instruction* inst) {
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if (!inst) {
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return nullptr;
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}
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KillNamesAndDecorates(inst);
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if (AreAnalysesValid(kAnalysisDefUse)) {
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get_def_use_mgr()->ClearInst(inst);
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}
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if (AreAnalysesValid(kAnalysisInstrToBlockMapping)) {
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instr_to_block_.erase(inst);
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}
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if (AreAnalysesValid(kAnalysisDecorations)) {
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if (inst->IsDecoration()) {
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decoration_mgr_->RemoveDecoration(inst);
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}
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}
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if (type_mgr_ && IsTypeInst(inst->opcode())) {
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type_mgr_->RemoveId(inst->result_id());
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}
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if (constant_mgr_ && IsConstantInst(inst->opcode())) {
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constant_mgr_->RemoveId(inst->result_id());
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}
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RemoveFromIdToName(inst);
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Instruction* next_instruction = nullptr;
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if (inst->IsInAList()) {
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next_instruction = inst->NextNode();
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inst->RemoveFromList();
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delete inst;
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} else {
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// Needed for instructions that are not part of a list like OpLabels,
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// OpFunction, OpFunctionEnd, etc..
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inst->ToNop();
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}
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return next_instruction;
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}
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bool IRContext::KillDef(uint32_t id) {
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Instruction* def = get_def_use_mgr()->GetDef(id);
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if (def != nullptr) {
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KillInst(def);
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return true;
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}
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return false;
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}
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bool IRContext::ReplaceAllUsesWith(uint32_t before, uint32_t after) {
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if (before == after) return false;
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// Ensure that |after| has been registered as def.
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assert(get_def_use_mgr()->GetDef(after) &&
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"'after' is not a registered def.");
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std::vector<std::pair<Instruction*, uint32_t>> uses_to_update;
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get_def_use_mgr()->ForEachUse(
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before, [&uses_to_update](Instruction* user, uint32_t index) {
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uses_to_update.emplace_back(user, index);
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});
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Instruction* prev = nullptr;
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for (auto p : uses_to_update) {
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Instruction* user = p.first;
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uint32_t index = p.second;
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if (prev == nullptr || prev != user) {
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ForgetUses(user);
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prev = user;
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}
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const uint32_t type_result_id_count =
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(user->result_id() != 0) + (user->type_id() != 0);
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if (index < type_result_id_count) {
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// Update the type_id. Note that result id is immutable so it should
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// never be updated.
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if (user->type_id() != 0 && index == 0) {
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user->SetResultType(after);
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} else if (user->type_id() == 0) {
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SPIRV_ASSERT(consumer_, false,
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"Result type id considered as use while the instruction "
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"doesn't have a result type id.");
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(void)consumer_; // Makes the compiler happy for release build.
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} else {
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SPIRV_ASSERT(consumer_, false,
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"Trying setting the immutable result id.");
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}
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} else {
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// Update an in-operand.
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uint32_t in_operand_pos = index - type_result_id_count;
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// Make the modification in the instruction.
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user->SetInOperand(in_operand_pos, {after});
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}
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AnalyzeUses(user);
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}
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return true;
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}
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bool IRContext::IsConsistent() {
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#ifndef SPIRV_CHECK_CONTEXT
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return true;
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#endif
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if (AreAnalysesValid(kAnalysisDefUse)) {
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analysis::DefUseManager new_def_use(module());
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if (*get_def_use_mgr() != new_def_use) {
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return false;
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}
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}
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if (AreAnalysesValid(kAnalysisInstrToBlockMapping)) {
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for (auto& func : *module()) {
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for (auto& block : func) {
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if (!block.WhileEachInst([this, &block](Instruction* inst) {
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if (get_instr_block(inst) != &block) {
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return false;
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}
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return true;
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}))
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return false;
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}
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}
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}
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if (!CheckCFG()) {
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return false;
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}
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return true;
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}
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void IRContext::ForgetUses(Instruction* inst) {
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if (AreAnalysesValid(kAnalysisDefUse)) {
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get_def_use_mgr()->EraseUseRecordsOfOperandIds(inst);
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}
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if (AreAnalysesValid(kAnalysisDecorations)) {
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if (inst->IsDecoration()) {
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get_decoration_mgr()->RemoveDecoration(inst);
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}
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}
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RemoveFromIdToName(inst);
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}
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void IRContext::AnalyzeUses(Instruction* inst) {
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if (AreAnalysesValid(kAnalysisDefUse)) {
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get_def_use_mgr()->AnalyzeInstUse(inst);
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}
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if (AreAnalysesValid(kAnalysisDecorations)) {
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if (inst->IsDecoration()) {
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get_decoration_mgr()->AddDecoration(inst);
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}
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}
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if (id_to_name_ &&
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(inst->opcode() == SpvOpName || inst->opcode() == SpvOpMemberName)) {
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id_to_name_->insert({inst->GetSingleWordInOperand(0), inst});
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}
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}
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void IRContext::KillNamesAndDecorates(uint32_t id) {
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analysis::DecorationManager* dec_mgr = get_decoration_mgr();
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dec_mgr->RemoveDecorationsFrom(id);
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std::vector<Instruction*> name_to_kill;
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for (auto name : GetNames(id)) {
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name_to_kill.push_back(name.second);
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}
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for (Instruction* name_inst : name_to_kill) {
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KillInst(name_inst);
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}
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}
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void IRContext::KillNamesAndDecorates(Instruction* inst) {
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const uint32_t rId = inst->result_id();
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if (rId == 0) return;
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KillNamesAndDecorates(rId);
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}
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void IRContext::AddCombinatorsForCapability(uint32_t capability) {
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if (capability == SpvCapabilityShader) {
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combinator_ops_[0].insert({SpvOpNop,
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SpvOpUndef,
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SpvOpConstant,
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SpvOpConstantTrue,
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SpvOpConstantFalse,
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SpvOpConstantComposite,
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SpvOpConstantSampler,
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SpvOpConstantNull,
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SpvOpTypeVoid,
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SpvOpTypeBool,
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SpvOpTypeInt,
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SpvOpTypeFloat,
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SpvOpTypeVector,
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SpvOpTypeMatrix,
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SpvOpTypeImage,
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SpvOpTypeSampler,
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SpvOpTypeSampledImage,
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SpvOpTypeArray,
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SpvOpTypeRuntimeArray,
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SpvOpTypeStruct,
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SpvOpTypeOpaque,
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SpvOpTypePointer,
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SpvOpTypeFunction,
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SpvOpTypeEvent,
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SpvOpTypeDeviceEvent,
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SpvOpTypeReserveId,
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SpvOpTypeQueue,
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SpvOpTypePipe,
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SpvOpTypeForwardPointer,
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SpvOpVariable,
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SpvOpImageTexelPointer,
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SpvOpLoad,
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SpvOpAccessChain,
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SpvOpInBoundsAccessChain,
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SpvOpArrayLength,
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SpvOpVectorExtractDynamic,
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SpvOpVectorInsertDynamic,
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SpvOpVectorShuffle,
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SpvOpCompositeConstruct,
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SpvOpCompositeExtract,
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SpvOpCompositeInsert,
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SpvOpCopyObject,
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SpvOpTranspose,
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SpvOpSampledImage,
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SpvOpImageSampleImplicitLod,
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SpvOpImageSampleExplicitLod,
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SpvOpImageSampleDrefImplicitLod,
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SpvOpImageSampleDrefExplicitLod,
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SpvOpImageSampleProjImplicitLod,
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SpvOpImageSampleProjExplicitLod,
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SpvOpImageSampleProjDrefImplicitLod,
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SpvOpImageSampleProjDrefExplicitLod,
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SpvOpImageFetch,
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SpvOpImageGather,
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SpvOpImageDrefGather,
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SpvOpImageRead,
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SpvOpImage,
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SpvOpImageQueryFormat,
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SpvOpImageQueryOrder,
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SpvOpImageQuerySizeLod,
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SpvOpImageQuerySize,
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SpvOpImageQueryLevels,
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SpvOpImageQuerySamples,
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SpvOpConvertFToU,
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SpvOpConvertFToS,
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SpvOpConvertSToF,
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SpvOpConvertUToF,
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SpvOpUConvert,
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SpvOpSConvert,
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SpvOpFConvert,
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SpvOpQuantizeToF16,
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SpvOpBitcast,
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SpvOpSNegate,
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SpvOpFNegate,
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SpvOpIAdd,
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SpvOpFAdd,
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SpvOpISub,
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SpvOpFSub,
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SpvOpIMul,
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SpvOpFMul,
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SpvOpUDiv,
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SpvOpSDiv,
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SpvOpFDiv,
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SpvOpUMod,
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SpvOpSRem,
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SpvOpSMod,
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SpvOpFRem,
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SpvOpFMod,
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SpvOpVectorTimesScalar,
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SpvOpMatrixTimesScalar,
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SpvOpVectorTimesMatrix,
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SpvOpMatrixTimesVector,
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SpvOpMatrixTimesMatrix,
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SpvOpOuterProduct,
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SpvOpDot,
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SpvOpIAddCarry,
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SpvOpISubBorrow,
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SpvOpUMulExtended,
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SpvOpSMulExtended,
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SpvOpAny,
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SpvOpAll,
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SpvOpIsNan,
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SpvOpIsInf,
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SpvOpLogicalEqual,
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SpvOpLogicalNotEqual,
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SpvOpLogicalOr,
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SpvOpLogicalAnd,
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SpvOpLogicalNot,
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SpvOpSelect,
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SpvOpIEqual,
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SpvOpINotEqual,
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SpvOpUGreaterThan,
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SpvOpSGreaterThan,
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SpvOpUGreaterThanEqual,
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SpvOpSGreaterThanEqual,
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SpvOpULessThan,
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SpvOpSLessThan,
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SpvOpULessThanEqual,
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SpvOpSLessThanEqual,
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SpvOpFOrdEqual,
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SpvOpFUnordEqual,
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SpvOpFOrdNotEqual,
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SpvOpFUnordNotEqual,
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SpvOpFOrdLessThan,
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SpvOpFUnordLessThan,
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SpvOpFOrdGreaterThan,
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SpvOpFUnordGreaterThan,
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SpvOpFOrdLessThanEqual,
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SpvOpFUnordLessThanEqual,
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SpvOpFOrdGreaterThanEqual,
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SpvOpFUnordGreaterThanEqual,
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SpvOpShiftRightLogical,
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SpvOpShiftRightArithmetic,
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SpvOpShiftLeftLogical,
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SpvOpBitwiseOr,
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SpvOpBitwiseXor,
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SpvOpBitwiseAnd,
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SpvOpNot,
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SpvOpBitFieldInsert,
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SpvOpBitFieldSExtract,
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SpvOpBitFieldUExtract,
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SpvOpBitReverse,
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SpvOpBitCount,
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SpvOpPhi,
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SpvOpImageSparseSampleImplicitLod,
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SpvOpImageSparseSampleExplicitLod,
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SpvOpImageSparseSampleDrefImplicitLod,
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SpvOpImageSparseSampleDrefExplicitLod,
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SpvOpImageSparseSampleProjImplicitLod,
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SpvOpImageSparseSampleProjExplicitLod,
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SpvOpImageSparseSampleProjDrefImplicitLod,
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SpvOpImageSparseSampleProjDrefExplicitLod,
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SpvOpImageSparseFetch,
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SpvOpImageSparseGather,
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SpvOpImageSparseDrefGather,
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SpvOpImageSparseTexelsResident,
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SpvOpImageSparseRead,
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SpvOpSizeOf});
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}
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}
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void IRContext::AddCombinatorsForExtension(Instruction* extension) {
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assert(extension->opcode() == SpvOpExtInstImport &&
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"Expecting an import of an extension's instruction set.");
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const char* extension_name =
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reinterpret_cast<const char*>(&extension->GetInOperand(0).words[0]);
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if (!strcmp(extension_name, "GLSL.std.450")) {
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combinator_ops_[extension->result_id()] = {GLSLstd450Round,
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GLSLstd450RoundEven,
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GLSLstd450Trunc,
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GLSLstd450FAbs,
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GLSLstd450SAbs,
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GLSLstd450FSign,
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GLSLstd450SSign,
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GLSLstd450Floor,
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GLSLstd450Ceil,
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GLSLstd450Fract,
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GLSLstd450Radians,
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GLSLstd450Degrees,
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GLSLstd450Sin,
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GLSLstd450Cos,
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GLSLstd450Tan,
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GLSLstd450Asin,
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GLSLstd450Acos,
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GLSLstd450Atan,
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GLSLstd450Sinh,
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GLSLstd450Cosh,
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GLSLstd450Tanh,
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GLSLstd450Asinh,
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GLSLstd450Acosh,
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GLSLstd450Atanh,
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GLSLstd450Atan2,
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GLSLstd450Pow,
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GLSLstd450Exp,
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GLSLstd450Log,
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GLSLstd450Exp2,
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GLSLstd450Log2,
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GLSLstd450Sqrt,
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GLSLstd450InverseSqrt,
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GLSLstd450Determinant,
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GLSLstd450MatrixInverse,
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GLSLstd450ModfStruct,
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GLSLstd450FMin,
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GLSLstd450UMin,
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GLSLstd450SMin,
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GLSLstd450FMax,
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GLSLstd450UMax,
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GLSLstd450SMax,
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GLSLstd450FClamp,
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GLSLstd450UClamp,
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GLSLstd450SClamp,
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GLSLstd450FMix,
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GLSLstd450IMix,
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GLSLstd450Step,
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GLSLstd450SmoothStep,
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GLSLstd450Fma,
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GLSLstd450FrexpStruct,
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GLSLstd450Ldexp,
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GLSLstd450PackSnorm4x8,
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GLSLstd450PackUnorm4x8,
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GLSLstd450PackSnorm2x16,
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GLSLstd450PackUnorm2x16,
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GLSLstd450PackHalf2x16,
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GLSLstd450PackDouble2x32,
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GLSLstd450UnpackSnorm2x16,
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GLSLstd450UnpackUnorm2x16,
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GLSLstd450UnpackHalf2x16,
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GLSLstd450UnpackSnorm4x8,
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GLSLstd450UnpackUnorm4x8,
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GLSLstd450UnpackDouble2x32,
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GLSLstd450Length,
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GLSLstd450Distance,
|
|
GLSLstd450Cross,
|
|
GLSLstd450Normalize,
|
|
GLSLstd450FaceForward,
|
|
GLSLstd450Reflect,
|
|
GLSLstd450Refract,
|
|
GLSLstd450FindILsb,
|
|
GLSLstd450FindSMsb,
|
|
GLSLstd450FindUMsb,
|
|
GLSLstd450InterpolateAtCentroid,
|
|
GLSLstd450InterpolateAtSample,
|
|
GLSLstd450InterpolateAtOffset,
|
|
GLSLstd450NMin,
|
|
GLSLstd450NMax,
|
|
GLSLstd450NClamp};
|
|
} else {
|
|
// Map the result id to the empty set.
|
|
combinator_ops_[extension->result_id()];
|
|
}
|
|
}
|
|
|
|
void IRContext::InitializeCombinators() {
|
|
get_feature_mgr()->GetCapabilities()->ForEach(
|
|
[this](SpvCapability cap) { AddCombinatorsForCapability(cap); });
|
|
|
|
for (auto& extension : module()->ext_inst_imports()) {
|
|
AddCombinatorsForExtension(&extension);
|
|
}
|
|
|
|
valid_analyses_ |= kAnalysisCombinators;
|
|
}
|
|
|
|
void IRContext::RemoveFromIdToName(const Instruction* inst) {
|
|
if (id_to_name_ &&
|
|
(inst->opcode() == SpvOpName || inst->opcode() == SpvOpMemberName)) {
|
|
auto range = id_to_name_->equal_range(inst->GetSingleWordInOperand(0));
|
|
for (auto it = range.first; it != range.second; ++it) {
|
|
if (it->second == inst) {
|
|
id_to_name_->erase(it);
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
LoopDescriptor* IRContext::GetLoopDescriptor(const Function* f) {
|
|
if (!AreAnalysesValid(kAnalysisLoopAnalysis)) {
|
|
ResetLoopAnalysis();
|
|
}
|
|
|
|
std::unordered_map<const Function*, LoopDescriptor>::iterator it =
|
|
loop_descriptors_.find(f);
|
|
if (it == loop_descriptors_.end()) {
|
|
return &loop_descriptors_
|
|
.emplace(std::make_pair(f, LoopDescriptor(this, f)))
|
|
.first->second;
|
|
}
|
|
|
|
return &it->second;
|
|
}
|
|
|
|
// Gets the dominator analysis for function |f|.
|
|
DominatorAnalysis* IRContext::GetDominatorAnalysis(const Function* f) {
|
|
if (!AreAnalysesValid(kAnalysisDominatorAnalysis)) {
|
|
ResetDominatorAnalysis();
|
|
}
|
|
|
|
if (dominator_trees_.find(f) == dominator_trees_.end()) {
|
|
dominator_trees_[f].InitializeTree(*cfg(), f);
|
|
}
|
|
|
|
return &dominator_trees_[f];
|
|
}
|
|
|
|
// Gets the postdominator analysis for function |f|.
|
|
PostDominatorAnalysis* IRContext::GetPostDominatorAnalysis(const Function* f) {
|
|
if (!AreAnalysesValid(kAnalysisDominatorAnalysis)) {
|
|
ResetDominatorAnalysis();
|
|
}
|
|
|
|
if (post_dominator_trees_.find(f) == post_dominator_trees_.end()) {
|
|
post_dominator_trees_[f].InitializeTree(*cfg(), f);
|
|
}
|
|
|
|
return &post_dominator_trees_[f];
|
|
}
|
|
|
|
bool IRContext::CheckCFG() {
|
|
std::unordered_map<uint32_t, std::vector<uint32_t>> real_preds;
|
|
if (!AreAnalysesValid(kAnalysisCFG)) {
|
|
return true;
|
|
}
|
|
|
|
for (Function& function : *module()) {
|
|
for (const auto& bb : function) {
|
|
bb.ForEachSuccessorLabel([&bb, &real_preds](const uint32_t lab_id) {
|
|
real_preds[lab_id].push_back(bb.id());
|
|
});
|
|
}
|
|
|
|
for (auto& bb : function) {
|
|
std::vector<uint32_t> preds = cfg()->preds(bb.id());
|
|
std::vector<uint32_t> real = real_preds[bb.id()];
|
|
std::sort(preds.begin(), preds.end());
|
|
std::sort(real.begin(), real.end());
|
|
|
|
bool same = true;
|
|
if (preds.size() != real.size()) {
|
|
same = false;
|
|
}
|
|
|
|
for (size_t i = 0; i < real.size() && same; i++) {
|
|
if (preds[i] != real[i]) {
|
|
same = false;
|
|
}
|
|
}
|
|
|
|
if (!same) {
|
|
std::cerr << "Predecessors for " << bb.id() << " are different:\n";
|
|
|
|
std::cerr << "Real:";
|
|
for (uint32_t i : real) {
|
|
std::cerr << ' ' << i;
|
|
}
|
|
std::cerr << std::endl;
|
|
|
|
std::cerr << "Recorded:";
|
|
for (uint32_t i : preds) {
|
|
std::cerr << ' ' << i;
|
|
}
|
|
std::cerr << std::endl;
|
|
}
|
|
if (!same) return false;
|
|
}
|
|
}
|
|
|
|
return true;
|
|
}
|
|
} // namespace opt
|
|
} // namespace spvtools
|