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AK: Implement FloatExtractor<f128>
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.
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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 ✅
@ -97,6 +97,24 @@ inline constexpr int count_leading_zeroes(IntType value)
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#endif
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}
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#ifdef __SIZEOF_INT128__
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// This is required for math.cpp internal_scalbn
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inline constexpr int count_leading_zeroes(unsigned __int128 value)
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{
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# if defined(AK_COMPILER_CLANG) || defined(AK_COMPILER_GCC)
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return (value > __UINT64_MAX__) ? __builtin_clzll(value >> 64) : 64 + __builtin_clzll(value);
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# else
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unsigned __int128 mask = (unsigned __int128)1 << 127;
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int ret = 0;
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while ((value & mask) == 0) {
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++ret;
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mask >>= 1;
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}
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return ret;
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# endif
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}
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#endif
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// The function will return the number of leading zeroes in the type. If
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// the given number is zero, this function will return the number of bits
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// in the IntType.
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@ -15,6 +15,26 @@ namespace AK {
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template<typename T>
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union FloatExtractor;
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#ifdef AK_HAS_FLOAT_128
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template<>
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union FloatExtractor<f128> {
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static constexpr int mantissa_bits = 112;
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static constexpr unsigned __int128 mantissa_max = (((unsigned __int128)1) << 112) - 1;
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static constexpr int exponent_bias = 16383;
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static constexpr int exponent_bits = 15;
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static constexpr unsigned exponent_max = 32767;
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struct {
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unsigned __int128 mantissa : 112;
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unsigned exponent : 15;
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unsigned sign : 1;
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};
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f128 d;
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};
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// Validate that f128 and the FloatExtractor union are 128 bits.
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static_assert(sizeof(f128) == 16);
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static_assert(sizeof(FloatExtractor<f128>) == 16);
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#endif
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#ifdef AK_HAS_FLOAT_80
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template<>
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union FloatExtractor<f80> {
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@ -31,7 +31,7 @@ constexpr T ceil_log2(T x)
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return 0;
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T log = AK::log2(x);
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log += (x & ((1 << (log - 1)) - 1)) != 0;
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log += (x & ((((T)1) << (log - 1)) - 1)) != 0;
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return log;
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}
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