mirror of
https://github.com/KhronosGroup/SPIRV-Tools
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97 lines
3.1 KiB
C++
97 lines
3.1 KiB
C++
// Copyright (c) 2019 Google LLC
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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#include "source/reduce/remove_block_reduction_opportunity_finder.h"
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#include "source/reduce/remove_block_reduction_opportunity.h"
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namespace spvtools {
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namespace reduce {
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using namespace opt;
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std::string RemoveBlockReductionOpportunityFinder::GetName() const {
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return "RemoveBlockReductionOpportunityFinder";
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}
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std::vector<std::unique_ptr<ReductionOpportunity>>
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RemoveBlockReductionOpportunityFinder::GetAvailableOpportunities(
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opt::IRContext* context) const {
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std::vector<std::unique_ptr<ReductionOpportunity>> result;
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// Consider every block in every function.
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for (auto& function : *context->module()) {
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for (auto bi = function.begin(); bi != function.end(); ++bi) {
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if (IsBlockValidOpportunity(context, function, bi)) {
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result.push_back(spvtools::MakeUnique<RemoveBlockReductionOpportunity>(
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&function, &*bi));
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}
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}
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}
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return result;
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}
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bool RemoveBlockReductionOpportunityFinder::IsBlockValidOpportunity(
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opt::IRContext* context, opt::Function& function,
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opt::Function::iterator& bi) {
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assert(bi != function.end() && "Block iterator was out of bounds");
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// Don't remove first block; we don't want to end up with no blocks.
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if (bi == function.begin()) {
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return false;
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}
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// Don't remove blocks with references.
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if (context->get_def_use_mgr()->NumUsers(bi->id()) > 0) {
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return false;
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}
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// Don't remove blocks whose instructions have outside references.
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if (!BlockInstructionsHaveNoOutsideReferences(context, bi)) {
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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 RemoveBlockReductionOpportunityFinder::
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BlockInstructionsHaveNoOutsideReferences(opt::IRContext* context,
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const Function::iterator& bi) {
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// Get all instructions in block.
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std::unordered_set<uint32_t> instructions_in_block;
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for (const Instruction& instruction : *bi) {
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instructions_in_block.insert(instruction.unique_id());
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}
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// For each instruction...
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for (const Instruction& instruction : *bi) {
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// For each use of the instruction...
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bool no_uses_outside_block = context->get_def_use_mgr()->WhileEachUser(
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&instruction, [&instructions_in_block](Instruction* user) -> bool {
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// If the use is in this block, continue (return true). Otherwise, we
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// found an outside use; return false (and stop).
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return instructions_in_block.find(user->unique_id()) !=
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instructions_in_block.end();
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});
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if (!no_uses_outside_block) {
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return false;
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}
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}
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return true;
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}
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} // namespace reduce
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} // namespace spvtools
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