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Remove c++11 from ctz/clz

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This commit is contained in:
Antonio Sanchez 2023-12-20 14:18:48 -08:00
parent bd57b99f44
commit ebf968b272
1 changed files with 22 additions and 14 deletions
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36
Eigen/src/Core/MathFunctions.h
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@ -879,10 +879,10 @@ struct meta_floor_log2<n, lower, upper, meta_floor_log2_bogus>
template <typename BitsType, typename EnableIf = void>
struct count_bits_impl {
static_assert(std::is_integral<BitsType>::value && std::is_unsigned<BitsType>::value,
"BitsType must be an unsigned integer");
static EIGEN_DEVICE_FUNC inline int clz(BitsType bits) {
EIGEN_STATIC_ASSERT(
is_integral<BitsType>::value && !NumTraits<BitsType>::IsSigned,
THIS_TYPE_IS_NOT_SUPPORTED);
int n = CHAR_BIT * sizeof(BitsType);
int shift = n / 2;
while (bits > 0 && shift > 0) {
@ -900,6 +900,9 @@ struct count_bits_impl {
}
static EIGEN_DEVICE_FUNC inline int ctz(BitsType bits) {
EIGEN_STATIC_ASSERT(
is_integral<BitsType>::value && !NumTraits<BitsType>::IsSigned,
THIS_TYPE_IS_NOT_SUPPORTED);
int n = CHAR_BIT * sizeof(BitsType);
int shift = n / 2;
while (bits > 0 && shift > 0) {
@ -932,45 +935,48 @@ EIGEN_DEVICE_FUNC inline int ctz(BitsType bits) {
#if EIGEN_COMP_GNUC || EIGEN_COMP_CLANG
template <typename BitsType>
struct count_bits_impl<BitsType, std::enable_if_t<sizeof(BitsType) <= sizeof(unsigned int)>> {
struct count_bits_impl<BitsType, typename enable_if<sizeof(BitsType) <= sizeof(unsigned int)>::type> {
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) {
EIGEN_STATIC_ASSERT(is_integral<BitsType>::value, THIS_TYPE_IS_NOT_SUPPORTED);
static const int kLeadingBitsOffset = (sizeof(unsigned int) - sizeof(BitsType)) * CHAR_BIT;
return bits == 0 ? kNumBits : __builtin_clz(static_cast<unsigned int>(bits)) - kLeadingBitsOffset;
}
static EIGEN_DEVICE_FUNC inline int ctz(BitsType bits) {
EIGEN_STATIC_ASSERT(is_integral<BitsType>::value, THIS_TYPE_IS_NOT_SUPPORTED);
return bits == 0 ? kNumBits : __builtin_ctz(static_cast<unsigned int>(bits));
}
};
template <typename BitsType>
struct count_bits_impl<
BitsType, std::enable_if_t<sizeof(unsigned int) < sizeof(BitsType) && sizeof(BitsType) <= sizeof(unsigned long)>> {
BitsType, typename enable_if<sizeof(unsigned int) < sizeof(BitsType) && sizeof(BitsType) <= sizeof(unsigned long)>::type> {
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) {
EIGEN_STATIC_ASSERT(is_integral<BitsType>::value, THIS_TYPE_IS_NOT_SUPPORTED);
static const int kLeadingBitsOffset = (sizeof(unsigned long) - sizeof(BitsType)) * CHAR_BIT;
return bits == 0 ? kNumBits : __builtin_clzl(static_cast<unsigned long>(bits)) - kLeadingBitsOffset;
}
static EIGEN_DEVICE_FUNC inline int ctz(BitsType bits) {
EIGEN_STATIC_ASSERT(is_integral<BitsType>::value, THIS_TYPE_IS_NOT_SUPPORTED);
return bits == 0 ? kNumBits : __builtin_ctzl(static_cast<unsigned long>(bits));
}
};
template <typename BitsType>
struct count_bits_impl<BitsType, std::enable_if_t<sizeof(unsigned long) < sizeof(BitsType) &&
sizeof(BitsType) <= sizeof(unsigned long long)>> {
struct count_bits_impl<BitsType, typename enable_if<sizeof(unsigned long) < sizeof(BitsType) &&
sizeof(BitsType) <= sizeof(unsigned long long)>::type> {
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) {
EIGEN_STATIC_ASSERT(is_integral<BitsType>::value, THIS_TYPE_IS_NOT_SUPPORTED);
static const int kLeadingBitsOffset = (sizeof(unsigned long long) - sizeof(BitsType)) * CHAR_BIT;
return bits == 0 ? kNumBits : __builtin_clzll(static_cast<unsigned long long>(bits)) - kLeadingBitsOffset;
}
static EIGEN_DEVICE_FUNC inline int ctz(BitsType bits) {
EIGEN_STATIC_ASSERT(is_integral<BitsType>::value, THIS_TYPE_IS_NOT_SUPPORTED);
return bits == 0 ? kNumBits : __builtin_ctzll(static_cast<unsigned long long>(bits));
}
};
@ -978,16 +984,17 @@ struct count_bits_impl<BitsType, std::enable_if_t<sizeof(unsigned long) < sizeof
#elif EIGEN_COMP_MSVC
template <typename BitsType>
struct count_bits_impl<BitsType, std::enable_if_t<sizeof(BitsType) <= sizeof(unsigned long)>> {
struct count_bits_impl<BitsType, typename enable_if<sizeof(BitsType) <= sizeof(unsigned long)>::type> {
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) {
EIGEN_STATIC_ASSERT(is_integral<BitsType>::value, THIS_TYPE_IS_NOT_SUPPORTED);
unsigned long out;
_BitScanReverse(&out, static_cast<unsigned long>(bits));
return bits == 0 ? kNumBits : (kNumBits - 1) - static_cast<int>(out);
}
static EIGEN_DEVICE_FUNC inline int ctz(BitsType bits) {
EIGEN_STATIC_ASSERT(is_integral<BitsType>::value, THIS_TYPE_IS_NOT_SUPPORTED);
unsigned long out;
_BitScanForward(&out, static_cast<unsigned long>(bits));
return bits == 0 ? kNumBits : static_cast<int>(out);
@ -998,16 +1005,17 @@ struct count_bits_impl<BitsType, std::enable_if_t<sizeof(BitsType) <= sizeof(uns
template <typename BitsType>
struct count_bits_impl<
BitsType, std::enable_if_t<sizeof(unsigned long) < sizeof(BitsType) && sizeof(BitsType) <= sizeof(__int64)>> {
BitsType, typename enable_if<sizeof(unsigned long) < sizeof(BitsType) && sizeof(BitsType) <= sizeof(__int64)>::type> {
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) {
EIGEN_STATIC_ASSERT(is_integral<BitsType>::value, THIS_TYPE_IS_NOT_SUPPORTED);
unsigned long out;
_BitScanReverse64(&out, static_cast<unsigned __int64>(bits));
return bits == 0 ? kNumBits : (kNumBits - 1) - static_cast<int>(out);
}
static EIGEN_DEVICE_FUNC inline int ctz(BitsType bits) {
EIGEN_STATIC_ASSERT(is_integral<BitsType>::value, THIS_TYPE_IS_NOT_SUPPORTED);
unsigned long out;
_BitScanForward64(&out, static_cast<unsigned __int64>(bits));
return bits == 0 ? kNumBits : static_cast<int>(out);