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* FASTFLOAT_HAS_BIT_CAST cleanup.

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This commit is contained in:
IRainman 2025-11-19 22:13:24 +03:00
parent 843aa3f703
commit 3685667dd2
3 changed files with 23 additions and 21 deletions
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1
include/fast_float/constexpr_feature_detect.h
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@ -32,7 +32,6 @@
// C++20 std::bit_cast
#if defined(__cpp_lib_bit_cast) && __cpp_lib_bit_cast >= 201806L
#include <bit>
#define FASTFLOAT_HAS_BIT_CAST 1
#else
#define FASTFLOAT_HAS_BIT_CAST 0

15
include/fast_float/digit_comparison.h
View File

@ -64,19 +64,12 @@ to_extended(T const &value) noexcept {
constexpr equiv_uint mantissa_mask = binary_format<T>::mantissa_mask();
constexpr equiv_uint hidden_bit_mask = binary_format<T>::hidden_bit_mask();
adjusted_mantissa am;
constexpr am_pow_t bias = binary_format<T>::mantissa_explicit_bits() -
binary_format<T>::minimum_exponent();
equiv_uint bits;
#if FASTFLOAT_HAS_BIT_CAST
bits =
#if FASTFLOAT_HAS_BIT_CAST == 1
std::
#endif
bit_cast<equiv_uint>(value);
#else
::memcpy(&bits, &value, sizeof(T));
#endif
equiv_uint const bits = bit_cast<T, equiv_uint>(value);
adjusted_mantissa am;
if ((bits & exponent_mask) == 0) {
// denormal
am.power2 = 1 - bias;

28
include/fast_float/float_common.h
View File

@ -101,6 +101,23 @@ using parse_options = parse_options_t<char>;
#include <bit>
#endif
namespace fast_float {
template <typename To, typename From>
FASTFLOAT_CONSTEXPR20 To bit_cast(const From &from) {
#if FASTFLOAT_HAS_BIT_CAST
return std::bit_cast<To>(from);
#else
// Implementation of std::bit_cast for pre-C++20.
static_assert(sizeof(To) == sizeof(From),
"bit_cast requires source and destination to be the same size");
auto to = To();
// The cast suppresses a bogus -Wclass-memaccess on GCC.
std::memcpy(static_cast<void *>(&to), &from, sizeof(to));
return to;
#endif
}
} // namespace fast_float
#if (defined(__x86_64) || defined(__x86_64__) || defined(_M_X64) || \
defined(__amd64) || defined(__aarch64__) || defined(_M_ARM64) || \
defined(__MINGW64__) || defined(__s390x__) || \
@ -1029,6 +1046,7 @@ binary_format<double>::hidden_bit_mask() {
return 0x0010000000000000;
}
// Fix for C2672: Ensure bit_cast is called with explicit template arguments
template <typename T>
fastfloat_really_inline FASTFLOAT_CONSTEXPR20 void to_float(
#ifndef FASTFLOAT_ONLY_POSITIVE_C_NUMBER_WO_INF_NAN
@ -1043,15 +1061,7 @@ fastfloat_really_inline FASTFLOAT_CONSTEXPR20 void to_float(
word =
equiv_uint(word | equiv_uint(negative) << binary_format<T>::sign_index());
#endif
#if FASTFLOAT_HAS_BIT_CAST
value =
#if FASTFLOAT_HAS_BIT_CAST == 1
std::
#endif
bit_cast<T>(word);
#else
::memcpy(&value, &word, sizeof(T));
#endif
value = bit_cast<T, equiv_uint>(word);
}
#ifndef FASTFLOAT_ONLY_POSITIVE_C_NUMBER_WO_INF_NAN