Adds FFT for XLA: CPU via Eigen, GPU via cuFFT.

GPU support includes plan reuse with new scratch allocator per execution in fft_thunk.

PiperOrigin-RevId: 179983419

1 files changed, 31 insertions, 0 deletions

diff --git a/tensorflow/compiler/xla/service/cpu/runtime_fft.h b/tensorflow/compiler/xla/service/cpu/runtime_fft.h
new file mode 100644
index 0000000000..f20c5aa0aa
--- /dev/null
+++ b/tensorflow/compiler/xla/service/cpu/runtime_fft.h
@@ -0,0 +1,31 @@
+/* Copyright 2017 The TensorFlow Authors. All Rights Reserved.
+
+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 TENSORFLOW_COMPILER_XLA_SERVICE_CPU_RUNTIME_FFT_H_
+#define TENSORFLOW_COMPILER_XLA_SERVICE_CPU_RUNTIME_FFT_H_
+
+#include "tensorflow/core/platform/types.h"
+
+extern "C" {
+
+extern void __xla_cpu_runtime_EigenFft(
+    const void* /* xla::ExecutableRunOptions* */ run_options_ptr, void* out,
+    void* operand, tensorflow::int32 fft_type, tensorflow::int32 fft_rank,
+    tensorflow::int64 input_batch, tensorflow::int64 fft_length0,
+    tensorflow::int64 fft_length1, tensorflow::int64 fft_length2);
+
+}  // extern "C"
+
+#endif  // TENSORFLOW_COMPILER_XLA_SERVICE_CPU_RUNTIME_FFT_H_