mirror of
https://github.com/KhronosGroup/SPIRV-Tools
synced 2024-11-29 14:31:04 +00:00
114af21994
Also convert some uses of assert() in optimization code to use SPIRV_ASSERT(), SPIRV_UNIMPLEMENTED(), or SPIRV_UNREACHABLE() accordingly.
49 lines
2.0 KiB
C++
49 lines
2.0 KiB
C++
// Copyright (c) 2016 Google Inc.
|
|
//
|
|
// Licensed under the Apache License, Version 2.0 (the "License");
|
|
// you may not use this file except in compliance with the License.
|
|
// You may obtain a copy of the License at
|
|
//
|
|
// http://www.apache.org/licenses/LICENSE-2.0
|
|
//
|
|
// Unless required by applicable law or agreed to in writing, software
|
|
// distributed under the License is distributed on an "AS IS" BASIS,
|
|
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
|
|
// See the License for the specific language governing permissions and
|
|
// limitations under the License.
|
|
|
|
#ifndef LIBSPIRV_OPT_UNIFY_CONSTANT_PASS_H_
|
|
#define LIBSPIRV_OPT_UNIFY_CONSTANT_PASS_H_
|
|
|
|
#include "module.h"
|
|
#include "pass.h"
|
|
|
|
namespace spvtools {
|
|
namespace opt {
|
|
|
|
// The optimization pass to de-duplicate the constants. Constants with exactly
|
|
// same values and identical form will be unified and only one constant will be
|
|
// kept for each unique pair of type and value.
|
|
// There are several cases not handled by this pass:
|
|
// 1) Constants defined by OpConstantNull instructions (null constants) and
|
|
// constants defined by OpConstantFalse, OpConstant or OpConstantComposite
|
|
// with value(s) 0 (zero-valued normal constants) are not considered
|
|
// equivalent. So null constants won't be used to replace zero-valued normal
|
|
// constants, and other constants won't replace the null constants either.
|
|
// 2) Whenever there are decorations to the constant's result id or its type
|
|
// id, the constants won't be handled, which means, it won't be used to
|
|
// replace any other constants, neither can other constants replace it.
|
|
// 3) NaN in float point format with different bit patterns are not unified.
|
|
class UnifyConstantPass : public Pass {
|
|
public:
|
|
explicit UnifyConstantPass(const MessageConsumer& c) : Pass(c) {}
|
|
|
|
const char* name() const override { return "unify-const"; }
|
|
bool Process(ir::Module*) override;
|
|
};
|
|
|
|
} // namespace opt
|
|
} // namespace spvtools
|
|
|
|
#endif // LIBSPIRV_OPT_UNIFY_CONSTANT_PASS_H_
|