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Description
/*
* Copyright (c) 2019-2023, NVIDIA CORPORATION. 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.
*/
__inline__ __device__ half fast_tanh(half x)
{
#if defined(__CUDA_ARCH__) && (__CUDACC_VER_MAJOR__ >= 11) && (__CUDA_ARCH__ >= 750)
uint16_t raw = reinterpret_cast<uint16_t const&>(x);
asm volatile("tanh.approx.f16 %0, %1;" : "=h"(raw) : "h"(raw));
half ret = reinterpret_cast<half const&>(raw);
return ret;
#else
return half(tanhf(float(x)));
#endif
}