1// Copyright (c) 2019 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/opt/legalize_vector_shuffle_pass.h"
16
17#include "source/opt/ir_context.h"
18
19namespace spvtools {
20namespace opt {
21
22Pass::Status LegalizeVectorShufflePass::Process() {
23 bool changed = false;
24 context()->module()->ForEachInst([&changed](Instruction* inst) {
25 if (inst->opcode() != SpvOpVectorShuffle) return;
26
27 for (uint32_t idx = 2; idx < inst->NumInOperands(); ++idx) {
28 auto literal = inst->GetSingleWordInOperand(idx);
29 if (literal != 0xFFFFFFFF) continue;
30 changed = true;
31 inst->SetInOperand(idx, {0});
32 }
33 });
34
35 return changed ? Status::SuccessWithChange : Status::SuccessWithoutChange;
36}
37
38} // namespace opt
39} // namespace spvtools
40