mirror of
https://github.com/ilyakooo0/urbit.git
synced 2024-12-12 05:04:56 +03:00
156 lines
5.9 KiB
C
156 lines
5.9 KiB
C
|
|
/*============================================================================
|
|
|
|
This C source file is part of the SoftFloat IEEE Floating-Point Arithmetic
|
|
Package, Release 3, by John R. Hauser.
|
|
|
|
Copyright 2011, 2012, 2013, 2014 The Regents of the University of California
|
|
(Regents). All Rights Reserved. Redistribution and use in source and binary
|
|
forms, with or without modification, are permitted provided that the following
|
|
conditions are met:
|
|
|
|
Redistributions of source code must retain the above copyright notice,
|
|
this list of conditions, and the following two paragraphs of disclaimer.
|
|
Redistributions in binary form must reproduce the above copyright notice,
|
|
this list of conditions, and the following two paragraphs of disclaimer in the
|
|
documentation and/or other materials provided with the distribution. Neither
|
|
the name of the Regents nor the names of its contributors may be used to
|
|
endorse or promote products derived from this software without specific prior
|
|
written permission.
|
|
|
|
IN NO EVENT SHALL REGENTS BE LIABLE TO ANY PARTY FOR DIRECT, INDIRECT,
|
|
SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES, INCLUDING LOST PROFITS, ARISING
|
|
OUT OF THE USE OF THIS SOFTWARE AND ITS DOCUMENTATION, EVEN IF REGENTS HAS
|
|
BEEN ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
|
|
|
|
REGENTS SPECIFICALLY DISCLAIMS ANY WARRANTIES, INCLUDING, BUT NOT LIMITED
|
|
TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
|
|
PURPOSE. THE SOFTWARE AND ACCOMPANYING DOCUMENTATION, IF ANY, PROVIDED
|
|
HEREUNDER IS PROVIDED "AS IS". REGENTS HAS NO OBLIGATION TO PROVIDE
|
|
MAINTENANCE, SUPPORT, UPDATES, ENHANCEMENTS, OR MODIFICATIONS.
|
|
|
|
=============================================================================*/
|
|
|
|
#include <stdbool.h>
|
|
#include <stdint.h>
|
|
#include "platform.h"
|
|
#include "internals.h"
|
|
#include "specialize.h"
|
|
#include "softfloat.h"
|
|
|
|
extFloat80_t extF80_mul( extFloat80_t a, extFloat80_t b )
|
|
{
|
|
union { struct extFloat80M s; extFloat80_t f; } uA;
|
|
uint_fast16_t uiA64;
|
|
uint_fast64_t uiA0;
|
|
bool signA;
|
|
int_fast32_t expA;
|
|
uint_fast64_t sigA;
|
|
union { struct extFloat80M s; extFloat80_t f; } uB;
|
|
uint_fast16_t uiB64;
|
|
uint_fast64_t uiB0;
|
|
bool signB;
|
|
int_fast32_t expB;
|
|
uint_fast64_t sigB;
|
|
bool signZ;
|
|
uint_fast64_t magBits;
|
|
struct exp32_sig64 normExpSig;
|
|
int_fast32_t expZ;
|
|
struct uint128 sig128Z, uiZ;
|
|
uint_fast16_t uiZ64;
|
|
uint_fast64_t uiZ0;
|
|
union { struct extFloat80M s; extFloat80_t f; } uZ;
|
|
|
|
/*------------------------------------------------------------------------
|
|
*------------------------------------------------------------------------*/
|
|
uA.f = a;
|
|
uiA64 = uA.s.signExp;
|
|
uiA0 = uA.s.signif;
|
|
signA = signExtF80UI64( uiA64 );
|
|
expA = expExtF80UI64( uiA64 );
|
|
sigA = uiA0;
|
|
uB.f = b;
|
|
uiB64 = uB.s.signExp;
|
|
uiB0 = uB.s.signif;
|
|
signB = signExtF80UI64( uiB64 );
|
|
expB = expExtF80UI64( uiB64 );
|
|
sigB = uiB0;
|
|
signZ = signA ^ signB;
|
|
/*------------------------------------------------------------------------
|
|
*------------------------------------------------------------------------*/
|
|
if ( expA == 0x7FFF ) {
|
|
if (
|
|
(sigA & UINT64_C( 0x7FFFFFFFFFFFFFFF ))
|
|
|| ((expB == 0x7FFF) && (sigB & UINT64_C( 0x7FFFFFFFFFFFFFFF )))
|
|
) {
|
|
goto propagateNaN;
|
|
}
|
|
magBits = expB | sigB;
|
|
goto infArg;
|
|
}
|
|
if ( expB == 0x7FFF ) {
|
|
if ( sigB & UINT64_C( 0x7FFFFFFFFFFFFFFF ) ) goto propagateNaN;
|
|
magBits = expA | sigA;
|
|
goto infArg;
|
|
}
|
|
/*------------------------------------------------------------------------
|
|
*------------------------------------------------------------------------*/
|
|
if ( ! expA ) expA = 1;
|
|
if ( ! (sigA & UINT64_C( 0x8000000000000000 )) ) {
|
|
if ( ! sigA ) goto zero;
|
|
normExpSig = softfloat_normSubnormalExtF80Sig( sigA );
|
|
expA += normExpSig.exp;
|
|
sigA = normExpSig.sig;
|
|
}
|
|
if ( ! expB ) expB = 1;
|
|
if ( ! (sigB & UINT64_C( 0x8000000000000000 )) ) {
|
|
if ( ! sigB ) goto zero;
|
|
normExpSig = softfloat_normSubnormalExtF80Sig( sigB );
|
|
expB += normExpSig.exp;
|
|
sigB = normExpSig.sig;
|
|
}
|
|
/*------------------------------------------------------------------------
|
|
*------------------------------------------------------------------------*/
|
|
expZ = expA + expB - 0x3FFE;
|
|
sig128Z = softfloat_mul64To128( sigA, sigB );
|
|
if ( sig128Z.v64 < UINT64_C( 0x8000000000000000 ) ) {
|
|
--expZ;
|
|
sig128Z =
|
|
softfloat_add128(
|
|
sig128Z.v64, sig128Z.v0, sig128Z.v64, sig128Z.v0 );
|
|
}
|
|
return
|
|
softfloat_roundPackToExtF80(
|
|
signZ, expZ, sig128Z.v64, sig128Z.v0, extF80_roundingPrecision );
|
|
/*------------------------------------------------------------------------
|
|
*------------------------------------------------------------------------*/
|
|
propagateNaN:
|
|
uiZ = softfloat_propagateNaNExtF80UI( uiA64, uiA0, uiB64, uiB0 );
|
|
uiZ64 = uiZ.v64;
|
|
uiZ0 = uiZ.v0;
|
|
goto uiZ;
|
|
/*------------------------------------------------------------------------
|
|
*------------------------------------------------------------------------*/
|
|
infArg:
|
|
if ( ! magBits ) {
|
|
softfloat_raiseFlags( softfloat_flag_invalid );
|
|
uiZ64 = defaultNaNExtF80UI64;
|
|
uiZ0 = defaultNaNExtF80UI0;
|
|
} else {
|
|
uiZ64 = packToExtF80UI64( signZ, 0x7FFF );
|
|
uiZ0 = UINT64_C( 0x8000000000000000 );
|
|
}
|
|
goto uiZ;
|
|
/*------------------------------------------------------------------------
|
|
*------------------------------------------------------------------------*/
|
|
zero:
|
|
uiZ64 = packToExtF80UI64( signZ, 0 );
|
|
uiZ0 = 0;
|
|
uiZ:
|
|
uZ.s.signExp = uiZ64;
|
|
uZ.s.signif = uiZ0;
|
|
return uZ.f;
|
|
|
|
}
|
|
|