extF80M_to_f64.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
float64_t	extF80M_to_f64 (const extFloat80_t *aPtr)

Function Documentation

extF80M_to_f64()

float64_t extF80M_to_f64

(

const extFloat80_t *

aPtr

)

Definition at line 55 of file extF80M_to_f64.c.

{
    const struct extFloat80M *aSPtr;
    uint_fast16_t uiA64;
    bool sign;
    int32_t exp;
    uint64_t sig;
    struct commonNaN commonNaN;
    uint64_t uiZ;
    union ui64_f64 uZ;
 
    /*------------------------------------------------------------------------
    *------------------------------------------------------------------------*/
    aSPtr = (const struct extFloat80M *) aPtr;
    /*------------------------------------------------------------------------
    *------------------------------------------------------------------------*/
    uiA64 = aSPtr->signExp;
    sign = signExtF80UI64( uiA64 );
    exp  = expExtF80UI64( uiA64 );
    sig = aSPtr->signif;
    /*------------------------------------------------------------------------
    *------------------------------------------------------------------------*/
    if ( exp == 0x7FFF ) {
        if ( sig & UINT64_C( 0x7FFFFFFFFFFFFFFF ) ) {
            softfloat_extF80MToCommonNaN( aSPtr, &commonNaN );
            uiZ = softfloat_commonNaNToF64UI( &commonNaN );
        } else {
            uiZ = packToF64UI( sign, 0x7FF, 0 );
        }
        goto uiZ;
    }
    /*------------------------------------------------------------------------
    *------------------------------------------------------------------------*/
    if ( ! (sig & UINT64_C( 0x8000000000000000 )) ) {
        if ( ! sig ) {
            uiZ = packToF64UI( sign, 0, 0 );
            goto uiZ;
        }
        exp += softfloat_normExtF80SigM( &sig );
    }
    /*------------------------------------------------------------------------
    *------------------------------------------------------------------------*/
    sig = softfloat_shortShiftRightJam64( sig, 1 );
    exp -= 0x3C01;
    if ( sizeof (int_fast16_t) < sizeof (int32_t) ) {
        if ( exp < -0x1000 ) exp = -0x1000;
    }
    return softfloat_roundPackToF64( sign, exp, sig );
    /*------------------------------------------------------------------------
    *------------------------------------------------------------------------*/
 uiZ:
    uZ.ui = uiZ;
    return uZ.f;
 
}

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