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Add CUDA complex sqrt.

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This is to support scalar `sqrt` of complex numbers `std::complex<T>` on
device, requested by Tensorflow folks.

Technically `std::complex` is not supported by NVCC on device
(though it is by clang), so the default `sqrt(std::complex<T>)` function only
works on the host. Here we create an overload to add back the
functionality.

Also modified the CMake file to add `--relaxed-constexpr` (or
equivalent) flag for NVCC to allow calling constexpr functions from
device functions, and added support for specifying compute architecture for
NVCC (was already available for clang).
This commit is contained in:
Antonio Sanchez
2020-12-22 22:49:06 -08:00
parent fdf2ee62c5
commit 070d303d56
7 changed files with 217 additions and 28 deletions
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8
unsupported/Eigen/CXX11/src/Tensor/TensorGpuHipCudaDefines.h
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@@ -16,7 +16,7 @@
// for some reason gets sent to the gcc/host compiler instead of the gpu/nvcc/hipcc compiler
// When compiling such files, gcc will end up trying to pick up the CUDA headers by
// default (see the code within "unsupported/Eigen/CXX11/Tensor" that is guarded by EIGEN_USE_GPU)
// This will obsviously not work when trying to compile tensorflow on a system with no CUDA
// This will obviously not work when trying to compile tensorflow on a system with no CUDA
// To work around this issue for HIP systems (and leave the default behaviour intact), the
// HIP tensorflow build defines EIGEN_USE_HIP when compiling all source files, and
// "unsupported/Eigen/CXX11/Tensor" has been updated to use HIP header when EIGEN_USE_HIP is
@@ -30,6 +30,9 @@
#define gpuSuccess hipSuccess
#define gpuErrorNotReady hipErrorNotReady
#define gpuGetDeviceCount hipGetDeviceCount
#define gpuGetLastError hipGetLastError
#define gpuPeekAtLastError hipPeekAtLastError
#define gpuGetErrorName hipGetErrorName
#define gpuGetErrorString hipGetErrorString
#define gpuGetDeviceProperties hipGetDeviceProperties
#define gpuStreamDefault hipStreamDefault
@@ -57,6 +60,9 @@
#define gpuSuccess cudaSuccess
#define gpuErrorNotReady cudaErrorNotReady
#define gpuGetDeviceCount cudaGetDeviceCount
#define gpuGetLastError cudaGetLastError
#define gpuPeekAtLastError cudaPeekAtLastError
#define gpuGetErrorName cudaGetErrorName
#define gpuGetErrorString cudaGetErrorString
#define gpuGetDeviceProperties cudaGetDeviceProperties
#define gpuStreamDefault cudaStreamDefault