f64_to_f32.c File Reference

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

Include dependency graph for f64_to_f32.c:

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Functions
float32_t	f64_to_f32 (float64_t a)

Function Documentation

f64_to_f32()

float32_t f64_to_f32

(

float64_t

a

)

Definition at line 44 of file f64_to_f32.c.

{
    union ui64_f64 uA;
    uint_fast64_t uiA;
    bool sign;
    int_fast16_t exp;
    uint_fast64_t frac;
    struct commonNaN commonNaN;
    uint_fast32_t uiZ, frac32;
    union ui32_f32 uZ;
 
    /*------------------------------------------------------------------------
    *------------------------------------------------------------------------*/
    uA.f = a;
    uiA = uA.ui;
    sign = signF64UI( uiA );
    exp  = expF64UI( uiA );
    frac = fracF64UI( uiA );
    /*------------------------------------------------------------------------
    *------------------------------------------------------------------------*/
    if ( exp == 0x7FF ) {
        if ( frac ) {
            softfloat_f64UIToCommonNaN( uiA, &commonNaN );
            uiZ = softfloat_commonNaNToF32UI( &commonNaN );
        } else {
            uiZ = packToF32UI( sign, 0xFF, 0 );
        }
        goto uiZ;
    }
    /*------------------------------------------------------------------------
    *------------------------------------------------------------------------*/
    frac32 = softfloat_shortShiftRightJam64( frac, 22 );
    if ( ! (exp | frac32) ) {
        uiZ = packToF32UI( sign, 0, 0 );
        goto uiZ;
    }
    /*------------------------------------------------------------------------
    *------------------------------------------------------------------------*/
    return softfloat_roundPackToF32( sign, exp - 0x381, frac32 | 0x40000000 );
 uiZ:
    uZ.ui = uiZ;
    return uZ.f;
 
}

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