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Fixed the computation of leading zeros when compiling with msvc.

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This commit is contained in:
Benoit Steiner 2016-03-04 16:27:02 -08:00
parent 4e49fd5eb9
commit 60d9df11c1
1 changed files with 1 additions and 8 deletions
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9
unsupported/Eigen/CXX11/src/Tensor/TensorIntDiv.h
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@ -36,14 +36,7 @@ namespace {
#ifdef __CUDA_ARCH__
return (sizeof(T) == 8) ? __clzll(val) : __clz(val);
#elif EIGEN_COMP_MSVC
DWORD leading_zeros = 0;
if (sizeof(T) == 8) {
_BitScanReverse64(&leading_zeros, val);
}
else {
_BitScanReverse(&leading_zeros, val);
}
return leading_zeros;
return (sizeof(T) == 8) ? __lzcnt64(val) : __lzcnt(val);
#else
EIGEN_STATIC_ASSERT(sizeof(unsigned long long) == 8, YOU_MADE_A_PROGRAMMING_MISTAKE);
return (sizeof(T) == 8) ?