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AK: Introduce fixed-width floating point types (f32, f64, f80 and f128)

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Dan Klishch 2022-11-04 11:19:27 -04:00 committed by Andrew Kaster
parent 266882937d
commit 73f4cfa930
Notes: sideshowbarker 2024-07-17 14:36:19 +09:00 
Author: https://github.com/DanShaders
Commit: https://github.com/SerenityOS/serenity/commit/73f4cfa930
Pull-request: https://github.com/SerenityOS/serenity/pull/15920
Reviewed-by: https://github.com/BertalanD ✅
2 changed files with 23 additions and 11 deletions
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18
AK/FloatingPoint.h
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@ -15,13 +15,9 @@ namespace AK {
template<typename T>
union FloatExtractor;
#if ARCH(I386) || ARCH(X86_64) || ARCH(AARCH64)
// FIXME: There is no straightforward way, I can think of, to check
// in compile time that long double is really an 80-bit IEEE574 floating point number.
static_assert(__LDBL_MAX__ == 1.189731495357231765e4932L);
#ifdef AK_HAS_FLOAT_80
template<>
union FloatExtractor<long double> {
union FloatExtractor<f80> {
static constexpr int mantissa_bits = 64;
static constexpr unsigned long long mantissa_max = ~0u;
static constexpr int exponent_bias = 16383;
@ -32,12 +28,12 @@ union FloatExtractor<long double> {
unsigned exponent : 15;
unsigned sign : 1;
};
long double d;
f80 d;
};
#endif
template<>
union FloatExtractor<double> {
union FloatExtractor<f64> {
static constexpr int mantissa_bits = 52;
static constexpr unsigned long long mantissa_max = (1ull << 52) - 1;
static constexpr int exponent_bias = 1023;
@ -48,11 +44,11 @@ union FloatExtractor<double> {
unsigned exponent : 11;
unsigned sign : 1;
};
double d;
f64 d;
};
template<>
union FloatExtractor<float> {
union FloatExtractor<f32> {
static constexpr int mantissa_bits = 23;
static constexpr unsigned mantissa_max = (1 << 23) - 1;
static constexpr int exponent_bias = 127;
@ -63,7 +59,7 @@ union FloatExtractor<float> {
unsigned exponent : 8;
unsigned sign : 1;
};
float d;
f32 d;
};
template<size_t S, size_t E, size_t M>

16
AK/Types.h
View file

@ -19,6 +19,22 @@ using i32 = __INT32_TYPE__;
using i16 = __INT16_TYPE__;
using i8 = __INT8_TYPE__;
#ifndef KERNEL
using f32 = float;
static_assert(__FLT_MANT_DIG__ == 24 && __FLT_MAX_EXP__ == 128);
using f64 = double;
static_assert(__DBL_MANT_DIG__ == 53 && __DBL_MAX_EXP__ == 1024);
# if __LDBL_MANT_DIG__ == 64 && __LDBL_MAX_EXP__ == 16384
# define AK_HAS_FLOAT_80 1
using f80 = long double;
# elif __LDBL_MANT_DIG__ == 113 && __LDBL_MAX_EXP__ == 16384
# define AK_HAS_FLOAT_128 1
using f128 = long double;
# endif
#endif
#ifdef AK_OS_SERENITY
using size_t = __SIZE_TYPE__;