mirror of
https://github.com/openhwgroup/cvw
synced 2025-02-11 06:05:49 +00:00
195 lines
7.1 KiB
C
195 lines
7.1 KiB
C
|
|
/*============================================================================
|
|
|
|
This C source file is part of the SoftFloat IEEE Floating-Point Arithmetic
|
|
Package, Release 3e, by John R. Hauser.
|
|
|
|
Copyright 2011, 2012, 2013, 2014, 2015, 2016 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"
|
|
|
|
#ifdef SOFTFLOAT_FAST_INT64
|
|
|
|
void
|
|
extF80M_div(
|
|
const extFloat80_t *aPtr, const extFloat80_t *bPtr, extFloat80_t *zPtr )
|
|
{
|
|
|
|
*zPtr = extF80_div( *aPtr, *bPtr );
|
|
|
|
}
|
|
|
|
#else
|
|
|
|
void
|
|
extF80M_div(
|
|
const extFloat80_t *aPtr, const extFloat80_t *bPtr, extFloat80_t *zPtr )
|
|
{
|
|
const struct extFloat80M *aSPtr, *bSPtr;
|
|
struct extFloat80M *zSPtr;
|
|
uint_fast16_t uiA64;
|
|
int32_t expA;
|
|
uint_fast16_t uiB64;
|
|
int32_t expB;
|
|
bool signZ;
|
|
uint64_t sigA, x64;
|
|
int32_t expZ;
|
|
int shiftDist;
|
|
uint32_t y[3], recip32, sigB[3];
|
|
int ix;
|
|
uint32_t q, qs[2];
|
|
uint_fast16_t uiZ64;
|
|
uint64_t uiZ0;
|
|
|
|
/*------------------------------------------------------------------------
|
|
*------------------------------------------------------------------------*/
|
|
aSPtr = (const struct extFloat80M *) aPtr;
|
|
bSPtr = (const struct extFloat80M *) bPtr;
|
|
zSPtr = (struct extFloat80M *) zPtr;
|
|
/*------------------------------------------------------------------------
|
|
*------------------------------------------------------------------------*/
|
|
uiA64 = aSPtr->signExp;
|
|
expA = expExtF80UI64( uiA64 );
|
|
uiB64 = bSPtr->signExp;
|
|
expB = expExtF80UI64( uiB64 );
|
|
signZ = signExtF80UI64( uiA64 ) ^ signExtF80UI64( uiB64 );
|
|
/*------------------------------------------------------------------------
|
|
*------------------------------------------------------------------------*/
|
|
if ( (expA == 0x7FFF) || (expB == 0x7FFF) ) {
|
|
if ( softfloat_tryPropagateNaNExtF80M( aSPtr, bSPtr, zSPtr ) ) return;
|
|
if ( expA == 0x7FFF ) {
|
|
if ( expB == 0x7FFF ) goto invalid;
|
|
goto infinity;
|
|
}
|
|
goto zero;
|
|
}
|
|
/*------------------------------------------------------------------------
|
|
*------------------------------------------------------------------------*/
|
|
sigA = aSPtr->signif;
|
|
x64 = bSPtr->signif;
|
|
if ( ! expB ) expB = 1;
|
|
if ( ! (x64 & UINT64_C( 0x8000000000000000 )) ) {
|
|
if ( ! x64 ) {
|
|
if ( ! sigA ) goto invalid;
|
|
softfloat_raiseFlags( softfloat_flag_infinite );
|
|
goto infinity;
|
|
}
|
|
expB += softfloat_normExtF80SigM( &x64 );
|
|
}
|
|
if ( ! expA ) expA = 1;
|
|
if ( ! (sigA & UINT64_C( 0x8000000000000000 )) ) {
|
|
if ( ! sigA ) goto zero;
|
|
expA += softfloat_normExtF80SigM( &sigA );
|
|
}
|
|
/*------------------------------------------------------------------------
|
|
*------------------------------------------------------------------------*/
|
|
expZ = expA - expB + 0x3FFF;
|
|
shiftDist = 29;
|
|
if ( sigA < x64 ) {
|
|
--expZ;
|
|
shiftDist = 30;
|
|
}
|
|
softfloat_shortShiftLeft64To96M( sigA, shiftDist, y );
|
|
recip32 = softfloat_approxRecip32_1( x64>>32 );
|
|
sigB[indexWord( 3, 0 )] = (uint32_t) x64<<30;
|
|
x64 >>= 2;
|
|
sigB[indexWord( 3, 2 )] = x64>>32;
|
|
sigB[indexWord( 3, 1 )] = x64;
|
|
ix = 2;
|
|
for (;;) {
|
|
x64 = (uint64_t) y[indexWordHi( 3 )] * recip32;
|
|
q = (x64 + 0x80000000)>>32;
|
|
--ix;
|
|
if ( ix < 0 ) break;
|
|
softfloat_remStep96MBy32( y, 29, sigB, q, y );
|
|
if ( y[indexWordHi( 3 )] & 0x80000000 ) {
|
|
--q;
|
|
softfloat_add96M( y, sigB, y );
|
|
}
|
|
qs[ix] = q;
|
|
}
|
|
/*------------------------------------------------------------------------
|
|
*------------------------------------------------------------------------*/
|
|
if ( ((q + 1) & 0x3FFFFF) < 2 ) {
|
|
softfloat_remStep96MBy32( y, 29, sigB, q, y );
|
|
if ( y[indexWordHi( 3 )] & 0x80000000 ) {
|
|
--q;
|
|
softfloat_add96M( y, sigB, y );
|
|
} else if ( softfloat_compare96M( sigB, y ) <= 0 ) {
|
|
++q;
|
|
softfloat_sub96M( y, sigB, y );
|
|
}
|
|
if (
|
|
y[indexWordLo( 3 )] || y[indexWord( 3, 1 )] || y[indexWord( 3, 2 )]
|
|
) {
|
|
q |= 1;
|
|
}
|
|
}
|
|
/*------------------------------------------------------------------------
|
|
*------------------------------------------------------------------------*/
|
|
x64 = (uint64_t) q<<9;
|
|
y[indexWord( 3, 0 )] = x64;
|
|
x64 = ((uint64_t) qs[0]<<6) + (x64>>32);
|
|
y[indexWord( 3, 1 )] = x64;
|
|
y[indexWord( 3, 2 )] = (qs[1]<<3) + (x64>>32);
|
|
softfloat_roundPackMToExtF80M(
|
|
signZ, expZ, y, extF80_roundingPrecision, zSPtr );
|
|
return;
|
|
/*------------------------------------------------------------------------
|
|
*------------------------------------------------------------------------*/
|
|
invalid:
|
|
softfloat_invalidExtF80M( zSPtr );
|
|
return;
|
|
/*------------------------------------------------------------------------
|
|
*------------------------------------------------------------------------*/
|
|
infinity:
|
|
uiZ64 = packToExtF80UI64( signZ, 0x7FFF );
|
|
uiZ0 = UINT64_C( 0x8000000000000000 );
|
|
goto uiZ;
|
|
/*------------------------------------------------------------------------
|
|
*------------------------------------------------------------------------*/
|
|
zero:
|
|
uiZ64 = packToExtF80UI64( signZ, 0 );
|
|
uiZ0 = 0;
|
|
uiZ:
|
|
zSPtr->signExp = uiZ64;
|
|
zSPtr->signif = uiZ0;
|
|
|
|
}
|
|
|
|
#endif
|
|
|