s_addMagsF32.c File Reference

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

Include dependency graph for s_addMagsF32.c:

Go to the source code of this file.

Functions
float32_t	softfloat_addMagsF32 (uint_fast32_t uiA, uint_fast32_t uiB)

Function Documentation

softfloat_addMagsF32()

float32_t softfloat_addMagsF32	(	uint_fast32_t	uiA,
		uint_fast32_t	uiB )

Definition at line 43 of file s_addMagsF32.c.

{
    int_fast16_t expA;
    uint_fast32_t sigA;
    int_fast16_t expB;
    uint_fast32_t sigB;
    int_fast16_t expDiff;
    uint_fast32_t uiZ;
    bool signZ;
    int_fast16_t expZ;
    uint_fast32_t sigZ;
    union ui32_f32 uZ;
 
    /*------------------------------------------------------------------------
    *------------------------------------------------------------------------*/
    expA = expF32UI( uiA );
    sigA = fracF32UI( uiA );
    expB = expF32UI( uiB );
    sigB = fracF32UI( uiB );
    /*------------------------------------------------------------------------
    *------------------------------------------------------------------------*/
    expDiff = expA - expB;
    if ( ! expDiff ) {
        /*--------------------------------------------------------------------
        *--------------------------------------------------------------------*/
        if ( ! expA ) {
            uiZ = uiA + sigB;
            goto uiZ;
        }
        if ( expA == 0xFF ) {
            if ( sigA | sigB ) goto propagateNaN;
            uiZ = uiA;
            goto uiZ;
        }
        signZ = signF32UI( uiA );
        expZ = expA;
        sigZ = 0x01000000 + sigA + sigB;
        if ( ! (sigZ & 1) && (expZ < 0xFE) ) {
            uiZ = packToF32UI( signZ, expZ, sigZ>>1 );
            goto uiZ;
        }
        sigZ <<= 6;
    } else {
        /*--------------------------------------------------------------------
        *--------------------------------------------------------------------*/
        signZ = signF32UI( uiA );
        sigA <<= 6;
        sigB <<= 6;
        if ( expDiff < 0 ) {
            if ( expB == 0xFF ) {
                if ( sigB ) goto propagateNaN;
                uiZ = packToF32UI( signZ, 0xFF, 0 );
                goto uiZ;
            }
            expZ = expB;
            sigA += expA ? 0x20000000 : sigA;
            sigA = softfloat_shiftRightJam32( sigA, -expDiff );
        } else {
            if ( expA == 0xFF ) {
                if ( sigA ) goto propagateNaN;
                uiZ = uiA;
                goto uiZ;
            }
            expZ = expA;
            sigB += expB ? 0x20000000 : sigB;
            sigB = softfloat_shiftRightJam32( sigB, expDiff );
        }
        sigZ = 0x20000000 + sigA + sigB;
        if ( sigZ < 0x40000000 ) {
            --expZ;
            sigZ <<= 1;
        }
    }
    return softfloat_roundPackToF32( signZ, expZ, sigZ );
    /*------------------------------------------------------------------------
    *------------------------------------------------------------------------*/
 propagateNaN:
    uiZ = softfloat_propagateNaNF32UI( uiA, uiB );
 uiZ:
    uZ.ui = uiZ;
    return uZ.f;
 
}