mirror of
https://github.com/openhwgroup/cvw
synced 2025-02-11 06:05:49 +00:00
140 lines
5.3 KiB
C
140 lines
5.3 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 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_mul(
|
|
const extFloat80_t *aPtr, const extFloat80_t *bPtr, extFloat80_t *zPtr )
|
|
{
|
|
|
|
*zPtr = extF80_mul( *aPtr, *bPtr );
|
|
|
|
}
|
|
|
|
#else
|
|
|
|
void
|
|
extF80M_mul(
|
|
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;
|
|
uint_fast16_t exp, uiZ64;
|
|
uint64_t uiZ0, sigA, sigB;
|
|
int32_t expZ;
|
|
uint32_t sigProd[4], *extSigZPtr;
|
|
|
|
/*------------------------------------------------------------------------
|
|
*------------------------------------------------------------------------*/
|
|
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 (
|
|
(! aSPtr->signif && (expA != 0x7FFF))
|
|
|| (! bSPtr->signif && (expB != 0x7FFF))
|
|
) {
|
|
softfloat_invalidExtF80M( zSPtr );
|
|
return;
|
|
}
|
|
uiZ64 = packToExtF80UI64( signZ, 0x7FFF );
|
|
uiZ0 = UINT64_C( 0x8000000000000000 );
|
|
goto uiZ;
|
|
}
|
|
/*------------------------------------------------------------------------
|
|
*------------------------------------------------------------------------*/
|
|
if ( ! expA ) expA = 1;
|
|
sigA = aSPtr->signif;
|
|
if ( ! (sigA & UINT64_C( 0x8000000000000000 )) ) {
|
|
if ( ! sigA ) goto zero;
|
|
expA += softfloat_normExtF80SigM( &sigA );
|
|
}
|
|
if ( ! expB ) expB = 1;
|
|
sigB = bSPtr->signif;
|
|
if ( ! (sigB & UINT64_C( 0x8000000000000000 )) ) {
|
|
if ( ! sigB ) goto zero;
|
|
expB += softfloat_normExtF80SigM( &sigB );
|
|
}
|
|
/*------------------------------------------------------------------------
|
|
*------------------------------------------------------------------------*/
|
|
expZ = expA + expB - 0x3FFE;
|
|
softfloat_mul64To128M( sigA, sigB, sigProd );
|
|
if ( sigProd[indexWordLo( 4 )] ) sigProd[indexWord( 4, 1 )] |= 1;
|
|
extSigZPtr = &sigProd[indexMultiwordHi( 4, 3 )];
|
|
if ( sigProd[indexWordHi( 4 )] < 0x80000000 ) {
|
|
--expZ;
|
|
softfloat_add96M( extSigZPtr, extSigZPtr, extSigZPtr );
|
|
}
|
|
softfloat_roundPackMToExtF80M(
|
|
signZ, expZ, extSigZPtr, extF80_roundingPrecision, zSPtr );
|
|
return;
|
|
/*------------------------------------------------------------------------
|
|
*------------------------------------------------------------------------*/
|
|
zero:
|
|
uiZ64 = packToExtF80UI64( signZ, 0 );
|
|
uiZ0 = 0;
|
|
uiZ:
|
|
zSPtr->signExp = uiZ64;
|
|
zSPtr->signif = uiZ0;
|
|
|
|
}
|
|
|
|
#endif
|
|
|