1 /* Copyright 2015 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 #include "tensorflow/core/framework/bfloat16.h"
17
18 #include "third_party/eigen3/Eigen/Core"
19
20 namespace tensorflow {
21
RoundFloatToBFloat16(const float * src,bfloat16 * dst,int64 size)22 void RoundFloatToBFloat16(const float* src, bfloat16* dst, int64 size) {
23 Eigen::Map<const Eigen::ArrayXf> src_eigen(src, size);
24 Eigen::Map<Eigen::Array<bfloat16, Eigen::Dynamic, 1>> dst_eigen(dst, size);
25 dst_eigen = src_eigen.cast<bfloat16>();
26 }
27
FloatToBFloat16(const float * src,bfloat16 * dst,int64 size)28 void FloatToBFloat16(const float* src, bfloat16* dst, int64 size) {
29 for (; size != 0; src++, dst++, size--) {
30 #if __BYTE_ORDER__ == __ORDER_BIG_ENDIAN__
31 memcpy(dst, src, sizeof(bfloat16));
32 #else
33 memcpy(
34 dst,
35 reinterpret_cast<const char*>(src) + sizeof(float) - sizeof(bfloat16),
36 sizeof(bfloat16));
37 #endif
38 }
39 }
40
BFloat16ToFloat(const bfloat16 * src,float * dst,int64 size)41 void BFloat16ToFloat(const bfloat16* src, float* dst, int64 size) {
42 Eigen::Map<const Eigen::Array<bfloat16, Eigen::Dynamic, 1>> src_eigen(src,
43 size);
44 Eigen::Map<Eigen::ArrayXf> dst_eigen(dst, size);
45 dst_eigen = src_eigen.cast<float>();
46 }
47
48 } // end namespace tensorflow
49