f16_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	f16_to_f64 (float16_t a)

Function Documentation

f16_to_f64()

float64_t f16_to_f64

(

float16_t

a

)

Definition at line 44 of file f16_to_f64.c.

{
    union ui16_f16 uA;
    uint_fast16_t uiA;
    bool sign;
    int_fast8_t exp;
    uint_fast16_t frac;
    struct commonNaN commonNaN;
    uint_fast64_t uiZ;
    struct exp8_sig16 normExpSig;
    union ui64_f64 uZ;
 
    /*------------------------------------------------------------------------
    *------------------------------------------------------------------------*/
    uA.f = a;
    uiA = uA.ui;
    sign = signF16UI( uiA );
    exp  = expF16UI( uiA );
    frac = fracF16UI( uiA );
    /*------------------------------------------------------------------------
    *------------------------------------------------------------------------*/
    if ( exp == 0x1F ) {
        if ( frac ) {
            softfloat_f16UIToCommonNaN( uiA, &commonNaN );
            uiZ = softfloat_commonNaNToF64UI( &commonNaN );
        } else {
            uiZ = packToF64UI( sign, 0x7FF, 0 );
        }
        goto uiZ;
    }
    /*------------------------------------------------------------------------
    *------------------------------------------------------------------------*/
    if ( ! exp ) {
        if ( ! frac ) {
            uiZ = packToF64UI( sign, 0, 0 );
            goto uiZ;
        }
        normExpSig = softfloat_normSubnormalF16Sig( frac );
        exp = normExpSig.exp - 1;
        frac = normExpSig.sig;
    }
    /*------------------------------------------------------------------------
    *------------------------------------------------------------------------*/
    uiZ = packToF64UI( sign, exp + 0x3F0, (uint_fast64_t) frac<<42 );
 uiZ:
    uZ.ui = uiZ;
    return uZ.f;
 
}

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