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Fixed another clang warning

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This commit is contained in:
Benoit Steiner 2015-02-25 22:54:20 -08:00
parent f8fbb3f9a6
commit 27f3fb2bcc
1 changed files with 16 additions and 5 deletions
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21
unsupported/Eigen/CXX11/src/Tensor/TensorIntDiv.h
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@ -28,6 +28,21 @@ namespace Eigen {
namespace internal {
namespace {
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);
#else
return __clz(val);
#endif
}
};
template <typename T>
struct TensorIntDivisor {
public:
@ -44,11 +59,7 @@ struct TensorIntDivisor {
eigen_assert(divider <= (1<<(N-1)) - 1);
// fast ln2
#ifndef __CUDA_ARCH__
const int leading_zeros = __builtin_clz(divider);
#else
const int leading_zeros = __clz(divider);
#endif
const int leading_zeros = count_leading_zeros(divider);
const int log_div = N - (leading_zeros+1);
multiplier = (static_cast<uint64_t>(1) << (N+log_div)) / divider - (static_cast<uint64_t>(1) << N) + 1;