fixdfti.c File Reference

#include "fp64.h"

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Typedefs
typedef __int128	fixint_t
typedef unsigned __int128	fixuint_t

Functions
fixint_t	___fixdfti (uint64_t a)

Typedef Documentation

fixint_t

typedef __int128 fixint_t

Definition at line 13 of file fixdfti.c.

fixuint_t

typedef unsigned __int128 fixuint_t

Definition at line 14 of file fixdfti.c.

Function Documentation

___fixdfti()

fixint_t ___fixdfti

(

uint64_t

a

)

Definition at line 16 of file fixdfti.c.

                                {
    const fixint_t fixint_max = (fixint_t)((~(fixuint_t)0) / 2);
    const fixint_t fixint_min = -fixint_max - 1;
    // Break a into sign, exponent, significand
    const rep_t aRep = a;
    const rep_t aAbs = aRep & absMask;
    const fixint_t sign = aRep & signBit ? -1 : 1;
    const int exponent = (aAbs >> significandBits) - exponentBias;
    const rep_t significand = (aAbs & significandMask) | implicitBit;
 
    // If exponent is negative, the result is zero.
    if (exponent < 0)
        return 0;
 
    // If the value is too large for the integer type, saturate.
    if ((unsigned)exponent >= sizeof(fixint_t) * CHAR_BIT)
        return sign == 1 ? fixint_max : fixint_min;
 
    // If 0 <= exponent < significandBits, right shift to get the result.
    // Otherwise, shift left.
    if (exponent < significandBits)
        return sign * (significand >> (significandBits - exponent));
    else
        return sign * ((fixint_t)significand << (exponent - significandBits));
 
}

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