f128M_div.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
void	f128M_div (const float128_t *aPtr, const float128_t *bPtr, float128_t *zPtr)

Function Documentation

f128M_div()

void f128M_div	(	const float128_t *	aPtr,
		const float128_t *	bPtr,
		float128_t *	zPtr )

Definition at line 57 of file f128M_div.c.

{
    const uint32_t *aWPtr, *bWPtr;
    uint32_t *zWPtr, uiA96;
    bool signA;
    int32_t expA;
    uint32_t uiB96;
    bool signB;
    int32_t expB;
    bool signZ;
    uint32_t y[5], sigB[4];
    int32_t expZ;
    uint32_t recip32;
    int ix;
    uint64_t q64;
    uint32_t q, qs[3], uiZ96;
 
    /*------------------------------------------------------------------------
    *------------------------------------------------------------------------*/
    aWPtr = (const uint32_t *) aPtr;
    bWPtr = (const uint32_t *) bPtr;
    zWPtr = (uint32_t *) zPtr;
    /*------------------------------------------------------------------------
    *------------------------------------------------------------------------*/
    uiA96 = aWPtr[indexWordHi( 4 )];
    signA = signF128UI96( uiA96 );
    expA  = expF128UI96( uiA96 );
    uiB96 = bWPtr[indexWordHi( 4 )];
    signB = signF128UI96( uiB96 );
    expB  = expF128UI96( uiB96 );
    signZ = signA ^ signB;
    /*------------------------------------------------------------------------
    *------------------------------------------------------------------------*/
    if ( (expA == 0x7FFF) || (expB == 0x7FFF) ) {
        if ( softfloat_tryPropagateNaNF128M( aWPtr, bWPtr, zWPtr ) ) return;
        if ( expA == 0x7FFF ) {
            if ( expB == 0x7FFF ) goto invalid;
            goto infinity;
        }
        goto zero;
    }
    /*------------------------------------------------------------------------
    *------------------------------------------------------------------------*/
    expA = softfloat_shiftNormSigF128M( aWPtr, 13, y );
    expB = softfloat_shiftNormSigF128M( bWPtr, 13, sigB );
    if ( expA == -128 ) {
        if ( expB == -128 ) goto invalid;
        goto zero;
    }
    if ( expB == -128 ) {
        softfloat_raiseFlags( softfloat_flag_infinite );
        goto infinity;
    }
    /*------------------------------------------------------------------------
    *------------------------------------------------------------------------*/
    expZ = expA - expB + 0x3FFE;
    if ( softfloat_compare128M( y, sigB ) < 0 ) {
        --expZ;
        softfloat_add128M( y, y, y );
    }
    recip32 =
        softfloat_approxRecip32_1(
            ((uint64_t) sigB[indexWord( 4, 3 )]<<32 | sigB[indexWord( 4, 2 )])
                >>30
        );
    ix = 3;
    for (;;) {
        q64 = (uint64_t) y[indexWordHi( 4 )] * recip32;
        q = (q64 + 0x80000000)>>32;
        --ix;
        if ( ix < 0 ) break;
        softfloat_remStep128MBy32( y, 29, sigB, q, y );
        if ( y[indexWordHi( 4 )] & 0x80000000 ) {
            --q;
            softfloat_add128M( y, sigB, y );
        }
        qs[ix] = q;
    }
    /*------------------------------------------------------------------------
    *------------------------------------------------------------------------*/
    if ( ((q + 1) & 7) < 2 ) {
        softfloat_remStep128MBy32( y, 29, sigB, q, y );
        if ( y[indexWordHi( 4 )] & 0x80000000 ) {
            --q;
            softfloat_add128M( y, sigB, y );
        } else if ( softfloat_compare128M( sigB, y ) <= 0 ) {
            ++q;
            softfloat_sub128M( y, sigB, y );
        }
        if (
            y[indexWordLo( 4 )] || y[indexWord( 4, 1 )]
                || (y[indexWord( 4, 2 )] | y[indexWord( 4, 3 )])
        ) {
            q |= 1;
        }
    }
    /*------------------------------------------------------------------------
    *------------------------------------------------------------------------*/
    q64 = (uint64_t) q<<28;
    y[indexWord( 5, 0 )] = q64;
    q64 = ((uint64_t) qs[0]<<25) + (q64>>32);
    y[indexWord( 5, 1 )] = q64;
    q64 = ((uint64_t) qs[1]<<22) + (q64>>32);
    y[indexWord( 5, 2 )] = q64;
    q64 = ((uint64_t) qs[2]<<19) + (q64>>32);
    y[indexWord( 5, 3 )] = q64;
    y[indexWord( 5, 4 )] = q64>>32;
    softfloat_roundPackMToF128M( signZ, expZ, y, zWPtr );
    return;
    /*------------------------------------------------------------------------
    *------------------------------------------------------------------------*/
 invalid:
    softfloat_invalidF128M( zWPtr );
    return;
    /*------------------------------------------------------------------------
    *------------------------------------------------------------------------*/
 infinity:
    uiZ96 = packToF128UI96( signZ, 0x7FFF, 0 );
    goto uiZ96;
 zero:
    uiZ96 = packToF128UI96( signZ, 0, 0 );
 uiZ96:
    zWPtr[indexWordHi( 4 )] = uiZ96;
    zWPtr[indexWord( 4, 2 )] = 0;
    zWPtr[indexWord( 4, 1 )] = 0;
    zWPtr[indexWord( 4, 0 )] = 0;
 
}

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