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Fixed the implementation of Eigen::internal::count_leading_zeros for MSVC.

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Also updated the code to silence bogux warnings generated by nvcc when compilining this function.
This commit is contained in:
Benoit Steiner 2015-11-23 12:17:45 -08:00
parent 562078780a
commit 547a8608e5
1 changed files with 5 additions and 8 deletions
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13
unsupported/Eigen/CXX11/src/Tensor/TensorIntDiv.h
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@ -34,10 +34,7 @@ namespace {
EIGEN_DEVICE_FUNC EIGEN_ALWAYS_INLINE int count_leading_zeros(const T val)
{
#ifdef __CUDA_ARCH__
if (sizeof(T) == 8) {
return __clzll(val);
}
return __clz(val);
return (sizeof(T) == 8) ? __clzll(val) : __clz(val);
#elif EIGEN_COMP_MSVC
DWORD leading_zeros = 0;
if (sizeof(T) == 8) {
@ -46,11 +43,11 @@ namespace {
else {
_BitScanReverse(&leading_zero, val);
}
return leading_zeros;
#else
if (sizeof(T) == 8) {
return __builtin_clzl(static_cast<uint64_t>(val));
}
return __builtin_clz(static_cast<uint32_t>(val));
return (sizeof(T) == 8) ?
__builtin_clzl(static_cast<uint64_t>(val)) :
__builtin_clz(static_cast<uint32_t>(val));
#endif
}