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back to std::bit_cast

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This commit is contained in:
Anders Dalvander 2024-12-03 23:20:45 +01:00
parent 3b9ff76143
commit da819feb74
2 changed files with 63 additions and 49 deletions
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2
include/fast_float/digit_comparison.h
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@ -72,7 +72,7 @@ to_extended(T value) noexcept {
binary_format<T>::minimum_exponent();
equiv_uint bits;
#if FASTFLOAT_HAS_BIT_CAST
bits = bit_cast<equiv_uint>(value);
bits = std::bit_cast<equiv_uint>(value);
#else
::memcpy(&bits, &value, sizeof(T));
#endif

110
include/fast_float/float_common.h
View File

@ -260,6 +260,7 @@ struct is_supported_char_type
> {
};
#if 0
union float_union {
float f;
uint32_t bits;
@ -341,6 +342,7 @@ fastfloat_really_inline constexpr std::bfloat16_t bit_cast(const uint16_t &u) {
return fu.f;
}
#endif // __STDCPP_BFLOAT16_T__
#endif // 0
// Compares two ASCII strings in a case insensitive manner.
template <typename UC>
@ -519,25 +521,25 @@ template <typename T, typename U = void> struct binary_format_lookup_tables;
template <typename T> struct binary_format : binary_format_lookup_tables<T> {
using equiv_uint = equiv_uint_t<T>;
static inline constexpr int mantissa_explicit_bits();
static inline constexpr int minimum_exponent();
static inline constexpr int infinite_power();
static inline constexpr int sign_index();
static inline constexpr int
static constexpr int mantissa_explicit_bits();
static constexpr int minimum_exponent();
static constexpr int infinite_power();
static constexpr int sign_index();
static constexpr int
min_exponent_fast_path(); // used when fegetround() == FE_TONEAREST
static inline constexpr int max_exponent_fast_path();
static inline constexpr int max_exponent_round_to_even();
static inline constexpr int min_exponent_round_to_even();
static inline constexpr uint64_t max_mantissa_fast_path(int64_t power);
static inline constexpr uint64_t
static constexpr int max_exponent_fast_path();
static constexpr int max_exponent_round_to_even();
static constexpr int min_exponent_round_to_even();
static constexpr uint64_t max_mantissa_fast_path(int64_t power);
static constexpr uint64_t
max_mantissa_fast_path(); // used when fegetround() == FE_TONEAREST
static inline constexpr int largest_power_of_ten();
static inline constexpr int smallest_power_of_ten();
static inline constexpr T exact_power_of_ten(int64_t power);
static inline constexpr size_t max_digits();
static inline constexpr equiv_uint exponent_mask();
static inline constexpr equiv_uint mantissa_mask();
static inline constexpr equiv_uint hidden_bit_mask();
static constexpr int largest_power_of_ten();
static constexpr int smallest_power_of_ten();
static constexpr T exact_power_of_ten(int64_t power);
static constexpr size_t max_digits();
static constexpr equiv_uint exponent_mask();
static constexpr equiv_uint mantissa_mask();
static constexpr equiv_uint hidden_bit_mask();
};
template <typename U> struct binary_format_lookup_tables<double, U> {
@ -710,6 +712,11 @@ inline constexpr uint64_t binary_format<double>::max_mantissa_fast_path() {
return uint64_t(2) << mantissa_explicit_bits();
}
template <>
inline constexpr uint64_t binary_format<float>::max_mantissa_fast_path() {
return uint64_t(2) << mantissa_explicit_bits();
}
// credit: Jakub Jelínek
#ifdef __STDCPP_FLOAT16_T__
template <typename U> struct binary_format_lookup_tables<std::float16_t, U> {
@ -768,6 +775,11 @@ inline constexpr int binary_format<std::float16_t>::max_exponent_fast_path() {
return 4;
}
template <>
inline constexpr int binary_format<std::float16_t>::mantissa_explicit_bits() {
return 10;
}
template <>
inline constexpr uint64_t
binary_format<std::float16_t>::max_mantissa_fast_path() {
@ -790,43 +802,43 @@ inline constexpr int binary_format<std::float16_t>::min_exponent_fast_path() {
}
template <>
constexpr int binary_format<std::float16_t>::mantissa_explicit_bits() {
return 10;
}
template <>
constexpr int binary_format<std::float16_t>::max_exponent_round_to_even() {
inline constexpr int
binary_format<std::float16_t>::max_exponent_round_to_even() {
return 5;
}
template <>
constexpr int binary_format<std::float16_t>::min_exponent_round_to_even() {
inline constexpr int
binary_format<std::float16_t>::min_exponent_round_to_even() {
return -22;
}
template <> constexpr int binary_format<std::float16_t>::minimum_exponent() {
template <>
inline constexpr int binary_format<std::float16_t>::minimum_exponent() {
return -15;
}
template <> constexpr int binary_format<std::float16_t>::infinite_power() {
template <>
inline constexpr int binary_format<std::float16_t>::infinite_power() {
return 0x1F;
}
template <> constexpr int binary_format<std::float16_t>::sign_index() {
template <> inline constexpr int binary_format<std::float16_t>::sign_index() {
return 15;
}
template <>
constexpr int binary_format<std::float16_t>::largest_power_of_ten() {
inline constexpr int binary_format<std::float16_t>::largest_power_of_ten() {
return 4;
}
template <>
constexpr int binary_format<std::float16_t>::smallest_power_of_ten() {
inline constexpr int binary_format<std::float16_t>::smallest_power_of_ten() {
return -27;
}
template <> constexpr size_t binary_format<std::float16_t>::max_digits() {
template <>
inline constexpr size_t binary_format<std::float16_t>::max_digits() {
return 22;
}
@ -887,6 +899,11 @@ binary_format<std::bfloat16_t>::hidden_bit_mask() {
return 0x0080;
}
template <>
inline constexpr int binary_format<std::bfloat16_t>::mantissa_explicit_bits() {
return 7;
}
template <>
inline constexpr uint64_t
binary_format<std::bfloat16_t>::max_mantissa_fast_path() {
@ -909,43 +926,43 @@ inline constexpr int binary_format<std::bfloat16_t>::min_exponent_fast_path() {
}
template <>
constexpr int binary_format<std::bfloat16_t>::mantissa_explicit_bits() {
return 7;
}
template <>
constexpr int binary_format<std::bfloat16_t>::max_exponent_round_to_even() {
inline constexpr int
binary_format<std::bfloat16_t>::max_exponent_round_to_even() {
return 3;
}
template <>
constexpr int binary_format<std::bfloat16_t>::min_exponent_round_to_even() {
inline constexpr int
binary_format<std::bfloat16_t>::min_exponent_round_to_even() {
return -24;
}
template <> constexpr int binary_format<std::bfloat16_t>::minimum_exponent() {
template <>
inline constexpr int binary_format<std::bfloat16_t>::minimum_exponent() {
return -127;
}
template <> constexpr int binary_format<std::bfloat16_t>::infinite_power() {
template <>
inline constexpr int binary_format<std::bfloat16_t>::infinite_power() {
return 0xFF;
}
template <> constexpr int binary_format<std::bfloat16_t>::sign_index() {
template <> inline constexpr int binary_format<std::bfloat16_t>::sign_index() {
return 15;
}
template <>
constexpr int binary_format<std::bfloat16_t>::largest_power_of_ten() {
inline constexpr int binary_format<std::bfloat16_t>::largest_power_of_ten() {
return 38;
}
template <>
constexpr int binary_format<std::bfloat16_t>::smallest_power_of_ten() {
inline constexpr int binary_format<std::bfloat16_t>::smallest_power_of_ten() {
return -60;
}
template <> constexpr size_t binary_format<std::bfloat16_t>::max_digits() {
template <>
inline constexpr size_t binary_format<std::bfloat16_t>::max_digits() {
return 98;
}
@ -961,11 +978,6 @@ binary_format<double>::max_mantissa_fast_path(int64_t power) {
return (void)max_mantissa[0], max_mantissa[power];
}
template <>
inline constexpr uint64_t binary_format<float>::max_mantissa_fast_path() {
return uint64_t(2) << mantissa_explicit_bits();
}
template <>
inline constexpr uint64_t
binary_format<float>::max_mantissa_fast_path(int64_t power) {
@ -1064,6 +1076,7 @@ to_float(bool negative, adjusted_mantissa am, T &value) {
#endif
}
#if 0
#ifdef __STDCPP_FLOAT16_T__
template <>
fastfloat_really_inline void to_float<std::float16_t>(bool negative,
@ -1091,6 +1104,7 @@ fastfloat_really_inline void to_float<std::bfloat16_t>(bool negative,
}
#endif // __STDCPP_BFLOAT16_T__
#endif // 0
template <typename = void> struct space_lut {
static constexpr bool value[] = {