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AK+LibC+LibCrypto: Move FloatExtractor to AK/FloatingPoint.h

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This commit is contained in:
Dan Klishch 2022-10-28 12:02:03 -04:00 • committed by Andrew Kaster
parent 2d75229192
commit 17c9a3e8d9
3 changed files with 80 additions and 99 deletions
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52
AK/FloatingPoint.h
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@ -12,6 +12,57 @@
namespace AK {
template<typename T>
union FloatExtractor;
#if ARCH(I386) || ARCH(X86_64) || ARCH(AARCH64)
// This assumes long double is 80 bits, which is true with GCC on Intel platforms
template<>
union FloatExtractor<long double> {
static constexpr int mantissa_bits = 64;
static constexpr unsigned long long mantissa_max = ~0u;
static constexpr int exponent_bias = 16383;
static constexpr int exponent_bits = 15;
static constexpr unsigned exponent_max = 32767;
struct {
unsigned long long mantissa;
unsigned exponent : 15;
unsigned sign : 1;
};
long double d;
};
#endif
template<>
union FloatExtractor<double> {
static constexpr int mantissa_bits = 52;
static constexpr unsigned long long mantissa_max = (1ull << 52) - 1;
static constexpr int exponent_bias = 1023;
static constexpr int exponent_bits = 11;
static constexpr unsigned exponent_max = 2047;
struct {
unsigned long long mantissa : 52;
unsigned exponent : 11;
unsigned sign : 1;
};
double d;
};
template<>
union FloatExtractor<float> {
static constexpr int mantissa_bits = 23;
static constexpr unsigned mantissa_max = (1 << 23) - 1;
static constexpr int exponent_bias = 127;
static constexpr int exponent_bits = 8;
static constexpr unsigned exponent_max = 255;
struct {
unsigned long long mantissa : 23;
unsigned exponent : 8;
unsigned sign : 1;
};
float d;
};
template<size_t S, size_t E, size_t M>
requires(S <= 1 && E >= 1 && M >= 1 && (S + E + M) <= 64) class FloatingPointBits final {
public:
@ -183,6 +234,7 @@ constexpr float convert_to_native_float(I input) { return float_to_float<SingleF
}
using AK::DoubleFloatingPointBits;
using AK::FloatExtractor;
using AK::FloatingPointBits;
using AK::SingleFloatingPointBits;