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Added the ability to compute the absolute value of a half float

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This commit is contained in:
Benoit Steiner 2016-02-21 20:24:11 +00:00
parent 203490017f
commit 95fceb6452
2 changed files with 49 additions and 5 deletions
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15
Eigen/src/Core/arch/CUDA/PacketMathHalf.h
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@ -52,9 +52,13 @@ __device__ half operator /= (half& a, const half& b) {
a = a / b; a = a / b;
return a; return a;
} }
__device__ half __shfl_xor(half a, int) {
assert(false && "tbd"); namespace std {
return a; __device__ half abs(const half& a) {
half result;
result.x = a.x & 0x7FFF;
return result;
}
} }
namespace Eigen { namespace Eigen {
@ -214,8 +218,9 @@ template<> EIGEN_DEVICE_FUNC inline half predux_mul<half2>(const half2& a) {
} }
template<> EIGEN_DEVICE_FUNC inline half2 pabs<half2>(const half2& a) { template<> EIGEN_DEVICE_FUNC inline half2 pabs<half2>(const half2& a) {
assert(false && "tbd"); half2 result;
return half2(); result.x = a.x & 0x7FFF7FFF;
return result;
} }

39
unsupported/test/cxx11_tensor_of_float16_cuda.cu
View File

@ -55,6 +55,44 @@ void test_cuda_conversion() {
gpu_device.deallocate(d_conv); gpu_device.deallocate(d_conv);
} }
void test_cuda_unary() {
Eigen::CudaStreamDevice stream;
Eigen::GpuDevice gpu_device(&stream);
int num_elem = 101;
float* d_float = (float*)gpu_device.allocate(num_elem * sizeof(float));
float* d_res_half = (float*)gpu_device.allocate(num_elem * sizeof(float));
float* d_res_float = (float*)gpu_device.allocate(num_elem * sizeof(float));
Eigen::TensorMap<Eigen::Tensor<float, 1>, Eigen::Aligned> gpu_float(
d_float, num_elem);
Eigen::TensorMap<Eigen::Tensor<float, 1>, Eigen::Aligned> gpu_res_half(
d_res_half, num_elem);
Eigen::TensorMap<Eigen::Tensor<float, 1>, Eigen::Aligned> gpu_res_float(
d_res_float, num_elem);
gpu_float.device(gpu_device) = gpu_float.random();
gpu_res_float.device(gpu_device) = gpu_float.abs();
gpu_res_half.device(gpu_device) = gpu_float.cast<half>().abs().cast<float>();
Tensor<float, 1> half_prec(num_elem);
Tensor<float, 1> full_prec(num_elem);
gpu_device.memcpyDeviceToHost(half_prec.data(), d_res_half, num_elem*sizeof(float));
gpu_device.memcpyDeviceToHost(full_prec.data(), d_res_float, num_elem*sizeof(float));
gpu_device.synchronize();
for (int i = 0; i < num_elem; ++i) {
std::cout << "Checking unary " << i << std::endl;
VERIFY_IS_APPROX(full_prec(i), half_prec(i));
}
gpu_device.deallocate(d_float);
gpu_device.deallocate(d_res_half);
gpu_device.deallocate(d_res_float);
}
void test_cuda_elementwise() { void test_cuda_elementwise() {
Eigen::CudaStreamDevice stream; Eigen::CudaStreamDevice stream;
Eigen::GpuDevice gpu_device(&stream); Eigen::GpuDevice gpu_device(&stream);
@ -202,6 +240,7 @@ void test_cxx11_tensor_of_float16_cuda()
if (device.majorDeviceVersion() > 5 || if (device.majorDeviceVersion() > 5 ||
(device.majorDeviceVersion() == 5 && device.minorDeviceVersion() >= 3)) { (device.majorDeviceVersion() == 5 && device.minorDeviceVersion() >= 3)) {
CALL_SUBTEST_1(test_cuda_conversion()); CALL_SUBTEST_1(test_cuda_conversion());
CALL_SUBTEST_1(test_cuda_unary());
CALL_SUBTEST_1(test_cuda_elementwise()); CALL_SUBTEST_1(test_cuda_elementwise());
// CALL_SUBTEST_2(test_cuda_contractions()); // CALL_SUBTEST_2(test_cuda_contractions());
CALL_SUBTEST_3(test_cuda_reductions()); CALL_SUBTEST_3(test_cuda_reductions());