diff options
| author |  Benoit Steiner <benoit.steiner.goog@gmail.com> | 2015-02-25 23:54:43 -0800 |
|---|---|---|
| committer | Benoit Steiner <benoit.steiner.goog@gmail.com> | 2015-02-25 23:54:43 -0800 |
| commit | bffb6bdf455097ac5a6f98eb4bb549166e318989 (patch) | |
| tree | 86c9f23cb891f568a07bdef3debb114a88a5b3c3 /unsupported/Eigen/CXX11/src/Tensor/TensorIntDiv.h | |
| parent | 27f3fb2bcc8ea06f3f471560fc1c87210cd0c62b (diff) | |
Made TensorIntDiv.h compile with MSVC
Diffstat (limited to 'unsupported/Eigen/CXX11/src/Tensor/TensorIntDiv.h')
| -rw-r--r-- | unsupported/Eigen/CXX11/src/Tensor/TensorIntDiv.h | 10 |
1 files changed, 6 insertions, 4 deletions
diff --git a/unsupported/Eigen/CXX11/src/Tensor/TensorIntDiv.h b/unsupported/Eigen/CXX11/src/Tensor/TensorIntDiv.h index 4b22c64de..535abd6fd 100644 --- a/unsupported/Eigen/CXX11/src/Tensor/TensorIntDiv.h +++ b/unsupported/Eigen/CXX11/src/Tensor/TensorIntDiv.h @@ -29,14 +29,16 @@ namespace Eigen { namespace internal { namespace { + // Note: result is undefined if val == 0 template <typename T> EIGEN_DEVICE_FUNC EIGEN_ALWAYS_INLINE int count_leading_zeros(const T val) { #ifndef __CUDA_ARCH__ - if (sizeof(T) == 8) { - return __builtin_clzl(val); - } - return __builtin_clz(val); + return __builtin_clz(static_cast<uint32_t>(val)); +#elif EIGEN_COMP_MSVC + DWORD leading_zero = 0; + _BitScanReverse( &leading_zero, value); + return 31 - leading_zero; #else return __clz(val); #endif |