1 /* Copyright 2019 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 #ifndef TENSORFLOW_COMPILER_XLA_SERVICE_GPU_GEMM_BROADCAST_FOLDING_REWRITER_H_ 16 #define TENSORFLOW_COMPILER_XLA_SERVICE_GPU_GEMM_BROADCAST_FOLDING_REWRITER_H_ 17 18 #include <optional> 19 20 #include "tensorflow/compiler/xla/service/hlo_instructions.h" 21 #include "tensorflow/compiler/xla/service/hlo_module.h" 22 #include "tensorflow/compiler/xla/service/hlo_pass_interface.h" 23 24 namespace xla { 25 namespace gpu { 26 27 // cuBLAS GEMM has support for strided batched calls, where the stride is used 28 // to determine the offset between the batches. 29 // 30 // This allows (kCustomCall:gemm A kBroadcast(B)) or 31 // (kCustomCall:gemm kBroadcast(A) B) 32 // to be rewritten as (kCustomCall:gemm A B) with a zero stride for the 33 // broadcasted operand if the broadcast operates on all the batch dimensions. 34 // 35 // This pattern matches the above case and removes the unnecessary broadcast. 36 class GemmBroadcastFoldingRewriter : public HloModulePass { 37 public: name()38 absl::string_view name() const override { 39 return "cublas-gemm-broadcast-folding-rewriter"; 40 } 41 42 using HloPassInterface::Run; 43 StatusOr<bool> Run( 44 HloModule* module, 45 const absl::flat_hash_set<absl::string_view>& execution_threads) override; 46 }; 47 48 } // namespace gpu 49 } // namespace xla 50 51 #endif // TENSORFLOW_COMPILER_XLA_SERVICE_GPU_GEMM_BROADCAST_FOLDING_REWRITER_H_ 52