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#ifndef SOURCE_OPT_LEGALIZE_VECTOR_SHUFFLE_PASS_H_
16#define SOURCE_OPT_LEGALIZE_VECTOR_SHUFFLE_PASS_H_
17
18#include "source/opt/ir_context.h"
19#include "source/opt/module.h"
20#include "source/opt/pass.h"
21
22namespace spvtools {
23namespace opt {
24
25// Converts any usages of 0xFFFFFFFF for the literals in OpVectorShuffle to a
26// literal 0. This is needed because using OxFFFFFFFF is forbidden by the WebGPU
27// spec. 0xFFFFFFFF in the main spec indicates that the result for this
28// component has no source, thus is undefined. Since this is undefined
29// behaviour we are free to use 0.
30class LegalizeVectorShufflePass : public Pass {
31 public:
32 const char* name() const override { return "legalize-vector-shuffle"; }
33 Status Process() override;
34
35 IRContext::Analysis GetPreservedAnalyses() override {
36 return IRContext::kAnalysisInstrToBlockMapping |
37 IRContext::kAnalysisDecorations | IRContext::kAnalysisCombinators |
38 IRContext::kAnalysisCFG | IRContext::kAnalysisDominatorAnalysis |
39 IRContext::kAnalysisLoopAnalysis | IRContext::kAnalysisNameMap |
40 IRContext::kAnalysisScalarEvolution |
41 IRContext::kAnalysisRegisterPressure |
42 IRContext::kAnalysisValueNumberTable |
43 IRContext::kAnalysisStructuredCFG |
44 IRContext::kAnalysisBuiltinVarId |
45 IRContext::kAnalysisIdToFuncMapping | IRContext::kAnalysisTypes |
46 IRContext::kAnalysisDefUse | IRContext::kAnalysisConstants;
47 }
48};
49
50} // namespace opt
51} // namespace spvtools
52
53#endif // SOURCE_OPT_LEGALIZE_VECTOR_SHUFFLE_PASS_H_
54