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fix msvc clz

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(cherry picked from commit 2c4541f735d3dad2ce312bf785c366668d646f3b)
This commit is contained in:
Charles Schlosser 2023-12-13 03:33:49 +00:00 committed by Antonio Sanchez
parent b8f894947a
commit bd57b99f44
1 changed files with 2 additions and 4 deletions
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6
Eigen/src/Core/MathFunctions.h
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@ -982,10 +982,9 @@ struct count_bits_impl<BitsType, std::enable_if_t<sizeof(BitsType) <= sizeof(uns
static const int kNumBits = static_cast<int>(sizeof(BitsType) * CHAR_BIT);
static_assert(std::is_integral<BitsType>::value, "BitsType must be a built-in integer");
static EIGEN_DEVICE_FUNC inline int clz(BitsType bits) {
static const int kLeadingBitsOffset = static_cast<int>((sizeof(unsigned long) - sizeof(BitsType)) * CHAR_BIT);
unsigned long out;
_BitScanReverse(&out, static_cast<unsigned long>(bits));
return bits == 0 ? kNumBits : static_cast<int>(out - kLeadingBitsOffset);
return bits == 0 ? kNumBits : (kNumBits - 1) - static_cast<int>(out);
}
static EIGEN_DEVICE_FUNC inline int ctz(BitsType bits) {
@ -1003,10 +1002,9 @@ struct count_bits_impl<
static const int kNumBits = static_cast<int>(sizeof(BitsType) * CHAR_BIT);
static_assert(std::is_integral<BitsType>::value, "BitsType must be a built-in integer");
static EIGEN_DEVICE_FUNC inline int clz(BitsType bits) {
static const int kLeadingBitsOffset = static_cast<int>((sizeof(__int64) - sizeof(BitsType)) * CHAR_BIT);
unsigned long out;
_BitScanReverse64(&out, static_cast<unsigned __int64>(bits));
return bits == 0 ? kNumBits : static_cast<int>(out - kLeadingBitsOffset);
return bits == 0 ? kNumBits : (kNumBits - 1) - static_cast<int>(out);
}
static EIGEN_DEVICE_FUNC inline int ctz(BitsType bits) {