/*============================================================================

This C source file is part of the SoftFloat IEEE Floating-Point Arithmetic

Package, Release 3d, by John R. Hauser.

Copyright 2011, 2012, 2013, 2014 The Regents of the University of California.

All rights reserved.

Redistribution and use in source and binary forms, with or without

modification, are permitted provided that the following conditions are met:

1. Redistributions of source code must retain the above copyright notice,

this list of conditions, and the following disclaimer.

2. Redistributions in binary form must reproduce the above copyright notice,

this list of conditions, and the following disclaimer in the documentation

and/or other materials provided with the distribution.

3. Neither the name of the University nor the names of its contributors may

be used to endorse or promote products derived from this software without

specific prior written permission.

THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS "AS IS", AND ANY

EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED

WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE, ARE

DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE FOR ANY

DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES

(INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;

LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND

ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT

(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS

SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

=============================================================================*/

#include <stdbool.h>

#include <stdint.h>

#include "platform.h"

#include "internals.h"

#include "specialize.h"

#include "softfloat.h"

float32_t f32_div( float32_t a, float32_t b )

{

union ui32_f32 uA;

uint_fast32_t uiA;

bool signA;

int_fast16_t expA;

uint_fast32_t sigA;

union ui32_f32 uB;

uint_fast32_t uiB;

bool signB;

int_fast16_t expB;

uint_fast32_t sigB;

bool signZ;

struct exp16_sig32 normExpSig;

int_fast16_t expZ;

#ifdef SOFTFLOAT_FAST_DIV64TO32

uint_fast64_t sig64A;

uint_fast32_t sigZ;

#else

uint_fast32_t sigZ;

uint_fast64_t rem;

#endif

uint_fast32_t uiZ;

union ui32_f32 uZ;

/*------------------------------------------------------------------------

*------------------------------------------------------------------------*/

uA.f = a;

uiA = uA.ui;

signA = signF32UI( uiA );

expA = expF32UI( uiA );

sigA = fracF32UI( uiA );

uB.f = b;

uiB = uB.ui;

signB = signF32UI( uiB );

expB = expF32UI( uiB );

sigB = fracF32UI( uiB );

signZ = signA ^ signB;

/*------------------------------------------------------------------------

*------------------------------------------------------------------------*/

if ( expA == 0xFF ) {

if ( sigA ) goto propagateNaN;

if ( expB == 0xFF ) {

if ( sigB ) goto propagateNaN;

goto invalid;

}

goto infinity;

}

if ( expB == 0xFF ) {

if ( sigB ) goto propagateNaN;

goto zero;

}

/*------------------------------------------------------------------------

*------------------------------------------------------------------------*/

if ( ! expB ) {

if ( ! sigB ) {

if ( ! (expA | sigA) ) goto invalid;

softfloat_raiseFlags( softfloat_flag_infinite );

goto infinity;

}

normExpSig = softfloat_normSubnormalF32Sig( sigB );

expB = normExpSig.exp;

sigB = normExpSig.sig;

}

if ( ! expA ) {

if ( ! sigA ) goto zero;

normExpSig = softfloat_normSubnormalF32Sig( sigA );

expA = normExpSig.exp;

sigA = normExpSig.sig;

}

/*------------------------------------------------------------------------

*------------------------------------------------------------------------*/

expZ = expA - expB + 0x7E;

sigA |= 0x00800000;

sigB |= 0x00800000;

#ifdef SOFTFLOAT_FAST_DIV64TO32

if ( sigA < sigB ) {

--expZ;

sig64A = (uint_fast64_t) sigA<<31;

} else {

sig64A = (uint_fast64_t) sigA<<30;

}

sigZ = sig64A / sigB;

if ( ! (sigZ & 0x3F) ) sigZ |= ((uint_fast64_t) sigB * sigZ != sig64A);

#else

if ( sigA < sigB ) {

--expZ;

sigA <<= 8;

} else {

sigA <<= 7;

}

sigB <<= 8;

sigZ = ((uint_fast64_t) sigA * softfloat_approxRecip32_1( sigB ))>>32;

/*------------------------------------------------------------------------

*------------------------------------------------------------------------*/

sigZ += 2;

if ( (sigZ & 0x3F) < 2 ) {

sigZ &= ~3;

#ifdef SOFTFLOAT_FAST_INT64

rem = ((uint_fast64_t) sigA<<31) - (uint_fast64_t) sigZ * sigB;

#else

rem = ((uint_fast64_t) sigA<<32) - (uint_fast64_t) (sigZ<<1) * sigB;

#endif

if ( rem & UINT64_C( 0x8000000000000000 ) ) {

sigZ -= 4;

} else {

if ( rem ) sigZ |= 1;

}

}

#endif

return softfloat_roundPackToF32( signZ, expZ, sigZ );

/*------------------------------------------------------------------------

*------------------------------------------------------------------------*/

propagateNaN:

uiZ = softfloat_propagateNaNF32UI( uiA, uiB );

goto uiZ;

/*------------------------------------------------------------------------

*------------------------------------------------------------------------*/

invalid:

softfloat_raiseFlags( softfloat_flag_invalid );

uiZ = defaultNaNF32UI;

goto uiZ;

/*------------------------------------------------------------------------

*------------------------------------------------------------------------*/

infinity:

uiZ = packToF32UI( signZ, 0xFF, 0 );

goto uiZ;

/*------------------------------------------------------------------------

*------------------------------------------------------------------------*/

zero:

uiZ = packToF32UI( signZ, 0, 0 );

uiZ:

uZ.ui = uiZ;

return uZ.f;

}