i64_to_f128.c File Reference

#include <stdint.h>
#include "platform.h"
#include "internals.h"
#include "softfloat.h"

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Functions
float128_t	i64_to_f128 (int64_t a)

Function Documentation

i64_to_f128()

float128_t i64_to_f128

(

int64_t

a

)

Definition at line 42 of file i64_to_f128.c.

{
    uint_fast64_t uiZ64, uiZ0;
    bool sign;
    uint_fast64_t absA;
    int_fast8_t shiftDist;
    struct uint128 zSig;
    union ui128_f128 uZ;
 
    if ( ! a ) {
        uiZ64 = 0;
        uiZ0  = 0;
    } else {
        sign = (a < 0);
        absA = sign ? -(uint_fast64_t) a : (uint_fast64_t) a;
        shiftDist = softfloat_countLeadingZeros64( absA ) + 49;
        if ( 64 <= shiftDist ) {
            zSig.v64 = absA<<(shiftDist - 64);
            zSig.v0  = 0;
        } else {
            zSig = softfloat_shortShiftLeft128( 0, absA, shiftDist );
        }
        uiZ64 = packToF128UI64( sign, 0x406E - shiftDist, zSig.v64 );
        uiZ0  = zSig.v0;
    }
    uZ.ui.v64 = uiZ64;
    uZ.ui.v0  = uiZ0;
    return uZ.f;
 
}

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