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AK: Introduce fixed-width floating point types (f32, f64, f80 and f128)
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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 ✅
@ -15,13 +15,9 @@ namespace AK {
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template<typename T>
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union FloatExtractor;
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#if ARCH(I386) || ARCH(X86_64) || ARCH(AARCH64)
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// FIXME: There is no straightforward way, I can think of, to check
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// in compile time that long double is really an 80-bit IEEE574 floating point number.
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static_assert(__LDBL_MAX__ == 1.189731495357231765e4932L);
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#ifdef AK_HAS_FLOAT_80
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template<>
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union FloatExtractor<long double> {
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union FloatExtractor<f80> {
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static constexpr int mantissa_bits = 64;
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static constexpr unsigned long long mantissa_max = ~0u;
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static constexpr int exponent_bias = 16383;
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@ -32,12 +28,12 @@ union FloatExtractor<long double> {
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unsigned exponent : 15;
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unsigned sign : 1;
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};
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long double d;
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f80 d;
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};
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#endif
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template<>
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union FloatExtractor<double> {
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union FloatExtractor<f64> {
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static constexpr int mantissa_bits = 52;
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static constexpr unsigned long long mantissa_max = (1ull << 52) - 1;
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static constexpr int exponent_bias = 1023;
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@ -48,11 +44,11 @@ union FloatExtractor<double> {
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unsigned exponent : 11;
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unsigned sign : 1;
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};
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double d;
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f64 d;
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};
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template<>
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union FloatExtractor<float> {
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union FloatExtractor<f32> {
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static constexpr int mantissa_bits = 23;
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static constexpr unsigned mantissa_max = (1 << 23) - 1;
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static constexpr int exponent_bias = 127;
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@ -63,7 +59,7 @@ union FloatExtractor<float> {
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unsigned exponent : 8;
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unsigned sign : 1;
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};
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float d;
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f32 d;
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};
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template<size_t S, size_t E, size_t M>
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16
AK/Types.h
16
AK/Types.h
@ -19,6 +19,22 @@ using i32 = __INT32_TYPE__;
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using i16 = __INT16_TYPE__;
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using i8 = __INT8_TYPE__;
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#ifndef KERNEL
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using f32 = float;
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static_assert(__FLT_MANT_DIG__ == 24 && __FLT_MAX_EXP__ == 128);
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using f64 = double;
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static_assert(__DBL_MANT_DIG__ == 53 && __DBL_MAX_EXP__ == 1024);
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# if __LDBL_MANT_DIG__ == 64 && __LDBL_MAX_EXP__ == 16384
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# define AK_HAS_FLOAT_80 1
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using f80 = long double;
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# elif __LDBL_MANT_DIG__ == 113 && __LDBL_MAX_EXP__ == 16384
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# define AK_HAS_FLOAT_128 1
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using f128 = long double;
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# endif
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#endif
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#ifdef AK_OS_SERENITY
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using size_t = __SIZE_TYPE__;
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