f32_to_extF80.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
extFloat80_t	f32_to_extF80 (float32_t a)

Function Documentation

f32_to_extF80()

extFloat80_t f32_to_extF80

(

float32_t

a

)

Definition at line 44 of file f32_to_extF80.c.

{
    union ui32_f32 uA;
    uint_fast32_t uiA;
    bool sign;
    int_fast16_t exp;
    uint_fast32_t frac;
    struct commonNaN commonNaN;
    struct uint128 uiZ;
    uint_fast16_t uiZ64;
    uint_fast64_t uiZ0;
    struct exp16_sig32 normExpSig;
    union { struct extFloat80M s; extFloat80_t f; } uZ;
 
    /*------------------------------------------------------------------------
    *------------------------------------------------------------------------*/
    uA.f = a;
    uiA = uA.ui;
    sign = signF32UI( uiA );
    exp  = expF32UI( uiA );
    frac = fracF32UI( uiA );
    /*------------------------------------------------------------------------
    *------------------------------------------------------------------------*/
    if ( exp == 0xFF ) {
        if ( frac ) {
            softfloat_f32UIToCommonNaN( uiA, &commonNaN );
            uiZ = softfloat_commonNaNToExtF80UI( &commonNaN );
            uiZ64 = uiZ.v64;
            uiZ0  = uiZ.v0;
        } else {
            uiZ64 = packToExtF80UI64( sign, 0x7FFF );
            uiZ0  = UINT64_C( 0x8000000000000000 );
        }
        goto uiZ;
    }
    /*------------------------------------------------------------------------
    *------------------------------------------------------------------------*/
    if ( ! exp ) {
        if ( ! frac ) {
            uiZ64 = packToExtF80UI64( sign, 0 );
            uiZ0  = 0;
            goto uiZ;
        }
        normExpSig = softfloat_normSubnormalF32Sig( frac );
        exp = normExpSig.exp;
        frac = normExpSig.sig;
    }
    /*------------------------------------------------------------------------
    *------------------------------------------------------------------------*/
    uiZ64 = packToExtF80UI64( sign, exp + 0x3F80 );
    uiZ0  = (uint_fast64_t) (frac | 0x00800000)<<40;
 uiZ:
    uZ.s.signExp = uiZ64;
    uZ.s.signif  = uiZ0;
    return uZ.f;
 
}

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