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AK: Implement FloatExtractor<f128>

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This patch adds support for 128-bit floating points in FloatExtractor.

This is required to build SerenityOS on MacOS/aarch64. It might break
building for Raspberry Pi.
This commit is contained in:
Steffen Rusitschka 2022-11-25 18:15:55 +01:00 committed by Linus Groh
parent 2e806dab07
commit 1aa07d7328
Notes: sideshowbarker 2024-07-17 06:40:35 +09:00 
Author: https://github.com/rusitschka
Commit: https://github.com/SerenityOS/serenity/commit/1aa07d7328
Pull-request: https://github.com/SerenityOS/serenity/pull/16187
Reviewed-by: https://github.com/nico ✅
3 changed files with 39 additions and 1 deletions
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18
AK/BuiltinWrappers.h
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@ -97,6 +97,24 @@ inline constexpr int count_leading_zeroes(IntType value)
#endif
}
#ifdef __SIZEOF_INT128__
// This is required for math.cpp internal_scalbn
inline constexpr int count_leading_zeroes(unsigned __int128 value)
{
# if defined(AK_COMPILER_CLANG) || defined(AK_COMPILER_GCC)
return (value > __UINT64_MAX__) ? __builtin_clzll(value >> 64) : 64 + __builtin_clzll(value);
# else
unsigned __int128 mask = (unsigned __int128)1 << 127;
int ret = 0;
while ((value & mask) == 0) {
++ret;
mask >>= 1;
}
return ret;
# endif
}
#endif
// The function will return the number of leading zeroes in the type. If
// the given number is zero, this function will return the number of bits
// in the IntType.

20
AK/FloatingPoint.h
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@ -15,6 +15,26 @@ namespace AK {
template<typename T>
union FloatExtractor;
#ifdef AK_HAS_FLOAT_128
template<>
union FloatExtractor<f128> {
static constexpr int mantissa_bits = 112;
static constexpr unsigned __int128 mantissa_max = (((unsigned __int128)1) << 112) - 1;
static constexpr int exponent_bias = 16383;
static constexpr int exponent_bits = 15;
static constexpr unsigned exponent_max = 32767;
struct {
unsigned __int128 mantissa : 112;
unsigned exponent : 15;
unsigned sign : 1;
};
f128 d;
};
// Validate that f128 and the FloatExtractor union are 128 bits.
static_assert(sizeof(f128) == 16);
static_assert(sizeof(FloatExtractor<f128>) == 16);
#endif
#ifdef AK_HAS_FLOAT_80
template<>
union FloatExtractor<f80> {

2
AK/IntegralMath.h
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@ -31,7 +31,7 @@ constexpr T ceil_log2(T x)
return 0;
T log = AK::log2(x);
log += (x & ((1 << (log - 1)) - 1)) != 0;
log += (x & ((((T)1) << (log - 1)) - 1)) != 0;
return log;
}