soft_double_bits_from_float_bits()

u64 fl::soft_double_bits_from_float_bits ( u32 bits )

inline

Definition at line 152 of file soft_float.h.

                                                                   {
    const u64 sign = (bits >> 31) ? 0x8000000000000000ull : 0ull;
    const u32 exp_bits = (bits >> 23) & 0xFFu;
    const u32 mantissa_bits = bits & 0x007FFFFFu;
    if (exp_bits == 0xFFu) {
        return mantissa_bits == 0 ? sign | 0x7FF0000000000000ull
                                  : sign | 0x7FF8000000000000ull;
    }
    if (exp_bits == 0) {
        if (mantissa_bits == 0) {
            return sign;
        }
        // Subnormal float -- always a normal double. Walk the implicit bit
        // up to position 23, adjust exponent accordingly.
        u32 m = mantissa_bits;
        int shift = 0;
        while ((m & 0x00800000u) == 0) {
            m <<= 1;
            ++shift;
        }
        const int double_exp = 1 - 127 - shift + 1023;
        const u64 mantissa_d = static_cast<u64>(m & 0x007FFFFFu) << 29;
        return sign | (static_cast<u64>(double_exp) << 52) | mantissa_d;
    }
    const int double_exp = static_cast<int>(exp_bits) - 127 + 1023;
    const u64 mantissa_d = static_cast<u64>(mantissa_bits) << 29;
    return sign | (static_cast<u64>(double_exp) << 52) | mantissa_d;
}

References FL_NO_EXCEPT, and sign().

Referenced by fl::detail::json_ieee754_double_bits_from_float_bits(), and soft_float_to_double().

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