1 /* Copyright 2022 The TensorFlow Authors. All Rights Reserved. 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 16 #ifndef TENSORFLOW_COMPILER_XLA_SERVICE_SIMPLIFY_FP_CONVERSIONS_H_ 17 #define TENSORFLOW_COMPILER_XLA_SERVICE_SIMPLIFY_FP_CONVERSIONS_H_ 18 19 #include "tensorflow/compiler/xla/service/hlo_module.h" 20 #include "tensorflow/compiler/xla/service/hlo_pass_interface.h" 21 #include "tensorflow/core/platform/statusor.h" 22 23 namespace xla { 24 25 // Simplifies chains of floating-point conversions. 26 // 27 // The algebraic simplifier will remove convert pairs of the form `X -> Y -> X`, 28 // only when they are a no-op (e.g. `bf16 -> f32 -> bf16`). This passes does 29 // similar, but will simplify any chain of float conversions, possibly improving 30 // accuracy (e.g. `f32 -> bf16 -> f32` is removed). 31 class SimplifyFPConversions : public HloModulePass { 32 public: name()33 absl::string_view name() const override { return "simplify-fp-conversions"; } 34 35 using HloPassInterface::Run; 36 StatusOr<bool> Run( 37 HloModule* module, 38 const absl::flat_hash_set<absl::string_view>& execution_threads) override; 39 }; 40 41 } // namespace xla 42 43 #endif // TENSORFLOW_COMPILER_XLA_SERVICE_SIMPLIFY_FP_CONVERSIONS_H_ 44