You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
72 lines
2.0 KiB
72 lines
2.0 KiB
/* Copyright (c) 2016 PaddlePaddle Authors. All Rights Reserve.
|
|
|
|
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 HL_DEVICE_FUNCTIONS_CUH_
|
|
#define HL_DEVICE_FUNCTIONS_CUH_
|
|
|
|
namespace paddle {
|
|
|
|
template <class T>
|
|
inline __device__ T paddleAtomicAdd(T* address, T val);
|
|
|
|
template <>
|
|
inline __device__ float paddleAtomicAdd(float* address, float val) {
|
|
return atomicAdd(address, val);
|
|
}
|
|
|
|
template <>
|
|
inline __device__ double paddleAtomicAdd(double* address, double val) {
|
|
#if defined(__CUDA_ARCH__) && __CUDA_ARCH__ >= 600
|
|
return atomicAdd(address, val);
|
|
#else
|
|
// NOLINTNEXTLINE
|
|
unsigned long long int* address_as_ull = (unsigned long long int*)address;
|
|
unsigned long long int old = *address_as_ull, assumed; // NOLINT
|
|
|
|
do {
|
|
assumed = old;
|
|
old = atomicCAS(address_as_ull,
|
|
assumed,
|
|
__double_as_longlong(val +
|
|
__longlong_as_double(assumed)));
|
|
} while (assumed != old);
|
|
|
|
return __longlong_as_double(old);
|
|
#endif
|
|
}
|
|
} // namespace paddle
|
|
|
|
/**
|
|
* @brief sum reduction
|
|
*
|
|
* @param[in,out] smem input data, better to use __shared__ memory.
|
|
* @param[in] tid thread index.
|
|
* @param[in] threads the total thread number used to reduce,
|
|
* such as, blockDim.x.
|
|
*
|
|
* @return smem[0]: the sum of each elements in smem.
|
|
*/
|
|
__device__ __forceinline__
|
|
void simpleReduce(real* smem, int tid, int threads) {
|
|
for (unsigned int s = threads / 2; s > 0; s >>= 1) {
|
|
if (tid < s) {
|
|
smem[tid] += smem[tid + s];
|
|
}
|
|
__syncthreads();
|
|
}
|
|
}
|
|
|
|
#endif /* HL_DEVICE_FUNCTIONS_CUH_ */
|