mirror of
https://github.com/KhronosGroup/SPIRV-Tools
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529 lines
20 KiB
C++
529 lines
20 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 "aggressive_dead_code_elim_pass.h"
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#include "cfa.h"
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#include "iterator.h"
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#include "latest_version_glsl_std_450_header.h"
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#include <stack>
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namespace spvtools {
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namespace opt {
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namespace {
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const uint32_t kTypePointerStorageClassInIdx = 0;
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const uint32_t kEntryPointFunctionIdInIdx = 1;
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const uint32_t kSelectionMergeMergeBlockIdInIdx = 0;
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const uint32_t kLoopMergeMergeBlockIdInIdx = 0;
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const uint32_t kLoopMergeContinueBlockIdInIdx = 1;
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} // namespace
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bool AggressiveDCEPass::IsVarOfStorage(uint32_t varId, uint32_t storageClass) {
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if (varId == 0) return false;
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const ir::Instruction* varInst = get_def_use_mgr()->GetDef(varId);
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const SpvOp op = varInst->opcode();
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if (op != SpvOpVariable) return false;
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const uint32_t varTypeId = varInst->type_id();
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const ir::Instruction* varTypeInst = get_def_use_mgr()->GetDef(varTypeId);
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if (varTypeInst->opcode() != SpvOpTypePointer) return false;
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return varTypeInst->GetSingleWordInOperand(kTypePointerStorageClassInIdx) ==
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storageClass;
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}
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bool AggressiveDCEPass::IsLocalVar(uint32_t varId) {
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return IsVarOfStorage(varId, SpvStorageClassFunction) ||
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(IsVarOfStorage(varId, SpvStorageClassPrivate) && private_like_local_);
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}
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void AggressiveDCEPass::AddStores(uint32_t ptrId) {
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get_def_use_mgr()->ForEachUser(ptrId, [this](ir::Instruction* user) {
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switch (user->opcode()) {
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case SpvOpAccessChain:
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case SpvOpInBoundsAccessChain:
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case SpvOpCopyObject:
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this->AddStores(user->result_id());
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break;
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case SpvOpLoad:
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break;
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// If default, assume it stores e.g. frexp, modf, function call
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case SpvOpStore:
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default:
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if (!IsLive(user)) AddToWorklist(user);
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break;
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}
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});
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}
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bool AggressiveDCEPass::AllExtensionsSupported() const {
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// If any extension not in whitelist, return false
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for (auto& ei : get_module()->extensions()) {
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const char* extName =
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reinterpret_cast<const char*>(&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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bool AggressiveDCEPass::IsTargetDead(ir::Instruction* inst) {
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const uint32_t tId = inst->GetSingleWordInOperand(0);
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const ir::Instruction* tInst = get_def_use_mgr()->GetDef(tId);
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if (dead_insts_.find(tInst) != dead_insts_.end()) {
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return true;
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}
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return false;
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}
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void AggressiveDCEPass::ProcessLoad(uint32_t varId) {
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// Only process locals
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if (!IsLocalVar(varId)) return;
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// Return if already processed
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if (live_local_vars_.find(varId) != live_local_vars_.end()) return;
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// Mark all stores to varId as live
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AddStores(varId);
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// Cache varId as processed
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live_local_vars_.insert(varId);
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}
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bool AggressiveDCEPass::IsStructuredIfOrLoopHeader(ir::BasicBlock* bp,
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ir::Instruction** mergeInst,
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ir::Instruction** branchInst,
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uint32_t* mergeBlockId) {
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ir::Instruction* mi = bp->GetMergeInst();
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if (mi == nullptr) return false;
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ir::Instruction* bri = &*bp->tail();
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// Make sure it is not a Switch
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if (mi->opcode() == SpvOpSelectionMerge &&
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bri->opcode() != SpvOpBranchConditional)
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return false;
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if (branchInst != nullptr) *branchInst = bri;
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if (mergeInst != nullptr) *mergeInst = mi;
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if (mergeBlockId != nullptr) *mergeBlockId = mi->GetSingleWordInOperand(0);
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return true;
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}
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void AggressiveDCEPass::ComputeBlock2HeaderMaps(
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std::list<ir::BasicBlock*>& structuredOrder) {
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block2headerBranch_.clear();
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branch2merge_.clear();
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std::stack<ir::Instruction*> currentHeaderBranch;
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currentHeaderBranch.push(nullptr);
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uint32_t currentMergeBlockId = 0;
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for (auto bi = structuredOrder.begin(); bi != structuredOrder.end(); ++bi) {
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// If this block is the merge block of the current control construct,
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// we are leaving the current construct so we must update state
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if ((*bi)->id() == currentMergeBlockId) {
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currentHeaderBranch.pop();
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ir::Instruction* chb = currentHeaderBranch.top();
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if (chb != nullptr)
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currentMergeBlockId = branch2merge_[chb]->GetSingleWordInOperand(0);
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}
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ir::Instruction* mergeInst;
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ir::Instruction* branchInst;
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uint32_t mergeBlockId;
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bool is_header =
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IsStructuredIfOrLoopHeader(*bi, &mergeInst, &branchInst, &mergeBlockId);
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// If this is a loop header, update state first so the block will map to
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// the loop.
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if (is_header && mergeInst->opcode() == SpvOpLoopMerge) {
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currentHeaderBranch.push(branchInst);
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branch2merge_[branchInst] = mergeInst;
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currentMergeBlockId = mergeBlockId;
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}
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// Map the block to the current construct.
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block2headerBranch_[*bi] = currentHeaderBranch.top();
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// If this is an if header, update state so following blocks map to the if.
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if (is_header && mergeInst->opcode() == SpvOpSelectionMerge) {
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currentHeaderBranch.push(branchInst);
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branch2merge_[branchInst] = mergeInst;
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currentMergeBlockId = mergeBlockId;
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}
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}
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}
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void AggressiveDCEPass::ComputeInst2BlockMap(ir::Function* func) {
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for (auto& blk : *func) {
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blk.ForEachInst(
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[&blk, this](ir::Instruction* ip) { inst2block_[ip] = &blk; });
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}
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}
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void AggressiveDCEPass::AddBranch(uint32_t labelId, ir::BasicBlock* bp) {
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std::unique_ptr<ir::Instruction> newBranch(new ir::Instruction(
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context(), SpvOpBranch, 0, 0,
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{{spv_operand_type_t::SPV_OPERAND_TYPE_ID, {labelId}}}));
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get_def_use_mgr()->AnalyzeInstDefUse(&*newBranch);
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bp->AddInstruction(std::move(newBranch));
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}
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void AggressiveDCEPass::AddBreaksAndContinuesToWorklist(
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ir::Instruction* loopMerge) {
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const uint32_t mergeId =
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loopMerge->GetSingleWordInOperand(kLoopMergeMergeBlockIdInIdx);
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get_def_use_mgr()->ForEachUser(
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mergeId, [&loopMerge, this](ir::Instruction* user) {
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// A branch to the merge block can only be a break if it is nested in
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// the current loop
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SpvOp op = user->opcode();
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if (op != SpvOpBranchConditional && op != SpvOpBranch) return;
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ir::Instruction* branchInst = user;
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while (true) {
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ir::BasicBlock* blk = inst2block_[branchInst];
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ir::Instruction* hdrBranch = block2headerBranch_[blk];
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if (hdrBranch == nullptr) return;
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ir::Instruction* hdrMerge = branch2merge_[hdrBranch];
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if (hdrMerge == loopMerge) break;
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branchInst = hdrBranch;
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}
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if (!IsLive(user)) {
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AddToWorklist(user);
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// Add branch's merge if there is one
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ir::Instruction* userMerge = branch2merge_[user];
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if (userMerge != nullptr) AddToWorklist(userMerge);
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}
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});
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const uint32_t contId =
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loopMerge->GetSingleWordInOperand(kLoopMergeContinueBlockIdInIdx);
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get_def_use_mgr()->ForEachUser(contId, [&contId,
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this](ir::Instruction* user) {
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SpvOp op = user->opcode();
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if (op == SpvOpBranchConditional) {
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// A conditional branch can only be a continue if it does not have a merge
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// instruction or its merge block is not the continue block.
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ir::Instruction* hdrMerge = branch2merge_[user];
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if (hdrMerge != nullptr && hdrMerge->opcode() == SpvOpSelectionMerge) {
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uint32_t hdrMergeId =
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hdrMerge->GetSingleWordInOperand(kSelectionMergeMergeBlockIdInIdx);
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if (hdrMergeId == contId) return;
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// Need to mark merge instruction too
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if (!IsLive(hdrMerge)) AddToWorklist(hdrMerge);
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}
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} else if (op == SpvOpBranch) {
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// An unconditional branch can only be a continue if it is not
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// branching to its own merge block.
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ir::BasicBlock* blk = inst2block_[user];
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ir::Instruction* hdrBranch = block2headerBranch_[blk];
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if (hdrBranch == nullptr) return;
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ir::Instruction* hdrMerge = branch2merge_[hdrBranch];
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if (hdrMerge->opcode() == SpvOpLoopMerge) return;
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uint32_t hdrMergeId =
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hdrMerge->GetSingleWordInOperand(kSelectionMergeMergeBlockIdInIdx);
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if (contId == hdrMergeId) return;
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} else {
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return;
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}
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if (!IsLive(user)) AddToWorklist(user);
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});
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}
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bool AggressiveDCEPass::AggressiveDCE(ir::Function* func) {
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// Compute map from instruction to block
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ComputeInst2BlockMap(func);
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// Compute map from block to controlling conditional branch
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std::list<ir::BasicBlock*> structuredOrder;
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cfg()->ComputeStructuredOrder(func, &*func->begin(), &structuredOrder);
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ComputeBlock2HeaderMaps(structuredOrder);
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bool modified = false;
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// Add instructions with external side effects to worklist. Also add branches
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// EXCEPT those immediately contained in an "if" selection construct or a loop
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// or continue construct.
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// TODO(greg-lunarg): Handle Frexp, Modf more optimally
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call_in_func_ = false;
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func_is_entry_point_ = false;
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private_stores_.clear();
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// Stacks to keep track of when we are inside an if- or loop-construct.
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// When immediately inside an if- or loop-construct, we do not initially
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// mark branches live. All other branches must be marked live.
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std::stack<bool> assume_branches_live;
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std::stack<uint32_t> currentMergeBlockId;
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// Push sentinel values on stack for when outside of any control flow.
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assume_branches_live.push(true);
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currentMergeBlockId.push(0);
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for (auto bi = structuredOrder.begin(); bi != structuredOrder.end(); ++bi) {
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// If exiting if or loop, update stacks
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if ((*bi)->id() == currentMergeBlockId.top()) {
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assume_branches_live.pop();
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currentMergeBlockId.pop();
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}
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for (auto ii = (*bi)->begin(); ii != (*bi)->end(); ++ii) {
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SpvOp op = ii->opcode();
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switch (op) {
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case SpvOpStore: {
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uint32_t varId;
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(void)GetPtr(&*ii, &varId);
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// Mark stores as live if their variable is not function scope
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// and is not private scope. Remember private stores for possible
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// later inclusion
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if (IsVarOfStorage(varId, SpvStorageClassPrivate))
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private_stores_.push_back(&*ii);
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else if (!IsVarOfStorage(varId, SpvStorageClassFunction))
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AddToWorklist(&*ii);
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} break;
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case SpvOpLoopMerge: {
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assume_branches_live.push(false);
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currentMergeBlockId.push(
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ii->GetSingleWordInOperand(kLoopMergeMergeBlockIdInIdx));
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} break;
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case SpvOpSelectionMerge: {
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auto brii = ii;
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++brii;
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bool is_structured_if = brii->opcode() == SpvOpBranchConditional;
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assume_branches_live.push(!is_structured_if);
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currentMergeBlockId.push(
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ii->GetSingleWordInOperand(kSelectionMergeMergeBlockIdInIdx));
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if (!is_structured_if) AddToWorklist(&*ii);
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} break;
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case SpvOpBranch:
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case SpvOpBranchConditional: {
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if (assume_branches_live.top()) AddToWorklist(&*ii);
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} break;
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default: {
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// Function calls, atomics, function params, function returns, etc.
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// TODO(greg-lunarg): function calls live only if write to non-local
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if (!context()->IsCombinatorInstruction(&*ii)) {
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AddToWorklist(&*ii);
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}
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// Remember function calls
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if (op == SpvOpFunctionCall) call_in_func_ = true;
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} break;
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}
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}
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}
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// See if current function is an entry point
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for (auto& ei : get_module()->entry_points()) {
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if (ei.GetSingleWordInOperand(kEntryPointFunctionIdInIdx) ==
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func->result_id()) {
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func_is_entry_point_ = true;
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break;
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}
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}
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// If the current function is an entry point and has no function calls,
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// we can optimize private variables as locals
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private_like_local_ = func_is_entry_point_ && !call_in_func_;
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// If privates are not like local, add their stores to worklist
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if (!private_like_local_)
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for (auto& ps : private_stores_) AddToWorklist(ps);
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// Add OpGroupDecorates to worklist because they are a pain to remove
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// ids from.
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// TODO(greg-lunarg): Handle dead ids in OpGroupDecorate
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for (auto& ai : get_module()->annotations()) {
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if (ai.opcode() == SpvOpGroupDecorate) AddToWorklist(&ai);
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}
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// Perform closure on live instruction set.
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while (!worklist_.empty()) {
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ir::Instruction* liveInst = worklist_.front();
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// Add all operand instructions if not already live
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liveInst->ForEachInId([&liveInst, this](const uint32_t* iid) {
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ir::Instruction* inInst = get_def_use_mgr()->GetDef(*iid);
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// Do not add label if an operand of a branch. This is not needed
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// as part of live code discovery and can create false live code,
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// for example, the branch to a header of a loop.
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if (inInst->opcode() == SpvOpLabel && liveInst->IsBranch()) return;
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if (!IsLive(inInst)) AddToWorklist(inInst);
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});
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// If in a structured if or loop construct, add the controlling
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// conditional branch and its merge. Any containing control construct
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// is marked live when the merge and branch are processed out of the
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// worklist.
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ir::BasicBlock* blk = inst2block_[liveInst];
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ir::Instruction* branchInst = block2headerBranch_[blk];
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if (branchInst != nullptr && !IsLive(branchInst)) {
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AddToWorklist(branchInst);
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ir::Instruction* mergeInst = branch2merge_[branchInst];
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AddToWorklist(mergeInst);
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// If in a loop, mark all its break and continue instructions live
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if (mergeInst->opcode() == SpvOpLoopMerge)
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AddBreaksAndContinuesToWorklist(mergeInst);
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}
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// If local load, add all variable's stores if variable not already live
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if (liveInst->opcode() == SpvOpLoad) {
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uint32_t varId;
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(void)GetPtr(liveInst, &varId);
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if (varId != 0) {
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ProcessLoad(varId);
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}
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}
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// If function call, treat as if it loads from all pointer arguments
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else if (liveInst->opcode() == SpvOpFunctionCall) {
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liveInst->ForEachInId([this](const uint32_t* iid) {
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// Skip non-ptr args
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if (!IsPtr(*iid)) return;
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uint32_t varId;
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(void)GetPtr(*iid, &varId);
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ProcessLoad(varId);
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});
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}
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// If function parameter, treat as if it's result id is loaded from
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else if (liveInst->opcode() == SpvOpFunctionParameter) {
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ProcessLoad(liveInst->result_id());
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}
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worklist_.pop();
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}
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// Mark all non-live instructions dead except non-structured branches, which
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// now should be considered live unless their block is deleted.
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for (auto bi = structuredOrder.begin(); bi != structuredOrder.end(); ++bi) {
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for (auto ii = (*bi)->begin(); ii != (*bi)->end(); ++ii) {
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if (IsLive(&*ii)) continue;
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// TODO(greg-lunarg
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// https://github.com/KhronosGroup/SPIRV-Tools/issues/1021) This should be
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// using ii->IsBranch(), but this code does not handle OpSwitch
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// instructions yet.
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if ((ii->opcode() == SpvOpBranch ||
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ii->opcode() == SpvOpBranchConditional) &&
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!IsStructuredIfOrLoopHeader(*bi, nullptr, nullptr, nullptr))
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continue;
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dead_insts_.insert(&*ii);
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}
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}
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// Remove debug and annotation statements referencing dead instructions.
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// This must be done before killing the instructions, otherwise there are
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// dead objects in the def/use database.
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ir::Instruction* instruction = &*get_module()->debug2_begin();
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while (instruction) {
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if (instruction->opcode() != SpvOpName) {
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instruction = instruction->NextNode();
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continue;
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}
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if (IsTargetDead(instruction)) {
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instruction = context()->KillInst(instruction);
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modified = true;
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} else {
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instruction = instruction->NextNode();
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}
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}
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instruction = &*get_module()->annotation_begin();
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while (instruction) {
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if (instruction->opcode() != SpvOpDecorate &&
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instruction->opcode() != SpvOpDecorateId) {
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instruction = instruction->NextNode();
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continue;
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}
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if (IsTargetDead(instruction)) {
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instruction = context()->KillInst(instruction);
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modified = true;
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} else {
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instruction = instruction->NextNode();
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}
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}
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// Kill dead instructions and remember dead blocks
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for (auto bi = structuredOrder.begin(); bi != structuredOrder.end();) {
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uint32_t mergeBlockId = 0;
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(*bi)->ForEachInst([this, &modified, &mergeBlockId](ir::Instruction* inst) {
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if (dead_insts_.find(inst) == dead_insts_.end()) return;
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// If dead instruction is selection merge, remember merge block
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// for new branch at end of block
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if (inst->opcode() == SpvOpSelectionMerge ||
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inst->opcode() == SpvOpLoopMerge)
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mergeBlockId = inst->GetSingleWordInOperand(0);
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context()->KillInst(inst);
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modified = true;
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});
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// If a structured if or loop was deleted, add a branch to its merge
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// block, and traverse to the merge block and continue processing there.
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// We know the block still exists because the label is not deleted.
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if (mergeBlockId != 0) {
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AddBranch(mergeBlockId, *bi);
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for (++bi; (*bi)->id() != mergeBlockId; ++bi) {
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}
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} else {
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++bi;
|
|
}
|
|
}
|
|
// Cleanup all CFG including all unreachable blocks
|
|
CFGCleanup(func);
|
|
|
|
return modified;
|
|
}
|
|
|
|
void AggressiveDCEPass::Initialize(ir::IRContext* c) {
|
|
InitializeProcessing(c);
|
|
|
|
// Clear collections
|
|
worklist_ = std::queue<ir::Instruction*>{};
|
|
live_insts_.clear();
|
|
live_local_vars_.clear();
|
|
dead_insts_.clear();
|
|
|
|
// Initialize extensions whitelist
|
|
InitExtensions();
|
|
}
|
|
|
|
Pass::Status AggressiveDCEPass::ProcessImpl() {
|
|
// Current functionality assumes shader capability
|
|
// TODO(greg-lunarg): Handle additional capabilities
|
|
if (!context()->get_feature_mgr()->HasCapability(SpvCapabilityShader))
|
|
return Status::SuccessWithoutChange;
|
|
// Current functionality assumes relaxed logical addressing (see
|
|
// instruction.h)
|
|
// TODO(greg-lunarg): Handle non-logical addressing
|
|
if (context()->get_feature_mgr()->HasCapability(SpvCapabilityAddresses))
|
|
return Status::SuccessWithoutChange;
|
|
// If any extensions in the module are not explicitly supported,
|
|
// return unmodified.
|
|
if (!AllExtensionsSupported()) return Status::SuccessWithoutChange;
|
|
// Process all entry point functions
|
|
ProcessFunction pfn = [this](ir::Function* fp) { return AggressiveDCE(fp); };
|
|
bool modified = ProcessEntryPointCallTree(pfn, get_module());
|
|
return modified ? Status::SuccessWithChange : Status::SuccessWithoutChange;
|
|
}
|
|
|
|
AggressiveDCEPass::AggressiveDCEPass() {}
|
|
|
|
Pass::Status AggressiveDCEPass::Process(ir::IRContext* c) {
|
|
Initialize(c);
|
|
return ProcessImpl();
|
|
}
|
|
|
|
void AggressiveDCEPass::InitExtensions() {
|
|
extensions_whitelist_.clear();
|
|
extensions_whitelist_.insert({
|
|
"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",
|
|
});
|
|
}
|
|
|
|
} // namespace opt
|
|
} // namespace spvtools
|