f128_to_f32.c File Reference

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

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Functions
float32_t	f128_to_f32 (float128_t a)

Function Documentation

f128_to_f32()

float32_t f128_to_f32

(

float128_t

a

)

Definition at line 44 of file f128_to_f32.c.

{
    union ui128_f128 uA;
    uint_fast64_t uiA64, uiA0;
    bool sign;
    int_fast32_t exp;
    uint_fast64_t frac64;
    struct commonNaN commonNaN;
    uint_fast32_t uiZ, frac32;
    union ui32_f32 uZ;
 
    /*------------------------------------------------------------------------
    *------------------------------------------------------------------------*/
    uA.f = a;
    uiA64 = uA.ui.v64;
    uiA0  = uA.ui.v0;
    sign  = signF128UI64( uiA64 );
    exp   = expF128UI64( uiA64 );
    frac64 = fracF128UI64( uiA64 ) | (uiA0 != 0);
    /*------------------------------------------------------------------------
    *------------------------------------------------------------------------*/
    if ( exp == 0x7FFF ) {
        if ( frac64 ) {
            softfloat_f128UIToCommonNaN( uiA64, uiA0, &commonNaN );
            uiZ = softfloat_commonNaNToF32UI( &commonNaN );
        } else {
            uiZ = packToF32UI( sign, 0xFF, 0 );
        }
        goto uiZ;
    }
    /*------------------------------------------------------------------------
    *------------------------------------------------------------------------*/
    frac32 = softfloat_shortShiftRightJam64( frac64, 18 );
    if ( ! (exp | frac32) ) {
        uiZ = packToF32UI( sign, 0, 0 );
        goto uiZ;
    }
    /*------------------------------------------------------------------------
    *------------------------------------------------------------------------*/
    exp -= 0x3F81;
    if ( sizeof (int_fast16_t) < sizeof (int_fast32_t) ) {
        if ( exp < -0x1000 ) exp = -0x1000;
    }
    return softfloat_roundPackToF32( sign, exp, frac32 | 0x40000000 );
    /*------------------------------------------------------------------------
    *------------------------------------------------------------------------*/
 uiZ:
    uZ.ui = uiZ;
    return uZ.f;
 
}

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