1 // Copyright (c) 2018 Google LLC
2 //
3 // Licensed under the Apache License, Version 2.0 (the "License");
4 // you may not use this file except in compliance with the License.
5 // You may obtain a copy of the License at
6 //
7 //     http://www.apache.org/licenses/LICENSE-2.0
8 //
9 // Unless required by applicable law or agreed to in writing, software
10 // distributed under the License is distributed on an "AS IS" BASIS,
11 // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
12 // See the License for the specific language governing permissions and
13 // limitations under the License.
14 
15 #include "source/reduce/remove_instruction_reduction_opportunity.h"
16 
17 #include "source/opt/ir_context.h"
18 
19 namespace spvtools {
20 namespace reduce {
21 
PreconditionHolds()22 bool RemoveInstructionReductionOpportunity::PreconditionHolds() { return true; }
23 
Apply()24 void RemoveInstructionReductionOpportunity::Apply() {
25   const uint32_t kNumEntryPointInOperandsBeforeInterfaceIds = 3;
26   for (auto& entry_point : inst_->context()->module()->entry_points()) {
27     opt::Instruction::OperandList new_entry_point_in_operands;
28     for (uint32_t index = 0; index < entry_point.NumInOperands(); index++) {
29       if (index >= kNumEntryPointInOperandsBeforeInterfaceIds &&
30           entry_point.GetSingleWordInOperand(index) == inst_->result_id()) {
31         continue;
32       }
33       new_entry_point_in_operands.push_back(entry_point.GetInOperand(index));
34     }
35     entry_point.SetInOperands(std::move(new_entry_point_in_operands));
36   }
37   inst_->context()->KillInst(inst_);
38 }
39 
40 }  // namespace reduce
41 }  // namespace spvtools
42