mirror of
https://github.com/KhronosGroup/SPIRV-Tools
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57 lines
1.8 KiB
C++
57 lines
1.8 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 "remove_block_reduction_opportunity.h"
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#include "source/opt/ir_context.h"
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namespace spvtools {
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namespace reduce {
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using namespace opt;
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RemoveBlockReductionOpportunity::RemoveBlockReductionOpportunity(
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Function* function, BasicBlock* block)
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: function_(function), block_(block) {
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// precondition:
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assert(block_->begin() != block_->end() &&
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block_->begin()->context()->get_def_use_mgr()->NumUsers(
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block_->id()) == 0 &&
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"RemoveBlockReductionOpportunity block must have 0 references");
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}
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bool RemoveBlockReductionOpportunity::PreconditionHolds() {
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// Removing other blocks cannot disable this opportunity.
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return true;
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}
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void RemoveBlockReductionOpportunity::Apply() {
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// We need an iterator pointing to the block, hence the loop.
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for (auto bi = function_->begin(); bi != function_->end(); ++bi) {
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if (bi->id() == block_->id()) {
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bi->KillAllInsts(true);
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bi.Erase();
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// Block removal changes the function, but we don't use analyses, so no
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// need to invalidate them.
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return;
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}
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}
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assert(false &&
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"Unreachable: we should have found a block with the desired id.");
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}
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} // namespace reduce
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} // namespace spvtools
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