mirror of
https://github.com/ilyakooo0/urbit.git
synced 2024-12-25 16:05:27 +03:00
106 lines
4.4 KiB
C
106 lines
4.4 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"
|
||
|
|
|
||
|
|
/*----------------------------------------------------------------------------
|
||
|
|
| Assuming at least one of the two 128-bit floating-point values pointed to by
|
||
|
|
| `aWPtr' and `bWPtr' is a NaN, stores the combined NaN result at the location
|
||
|
|
| pointed to by `zWPtr'. If either original floating-point value is a
|
||
|
|
| signaling NaN, the invalid exception is raised. Each of `aWPtr', `bWPtr',
|
||
|
|
| and `zWPtr' points to an array of four 32-bit elements that concatenate in
|
||
|
|
| the platform's normal endian order to form a 128-bit floating-point value.
|
||
|
|
*----------------------------------------------------------------------------*/
|
||
|
|
void
|
||
|
|
softfloat_propagateNaNF128M(
|
||
|
|
const uint32_t *aWPtr, const uint32_t *bWPtr, uint32_t *zWPtr )
|
||
|
|
{
|
||
|
|
bool isSigNaNA;
|
||
|
|
const uint32_t *ptr;
|
||
|
|
bool isSigNaNB;
|
||
|
|
uint32_t uiA96, uiB96, wordMagA, wordMagB;
|
||
|
|
|
||
|
|
isSigNaNA = f128M_isSignalingNaN( (const float128_t *) aWPtr );
|
||
|
|
ptr = aWPtr;
|
||
|
|
if ( ! bWPtr ) {
|
||
|
|
if ( isSigNaNA ) softfloat_raiseFlags( softfloat_flag_invalid );
|
||
|
|
goto copy;
|
||
|
|
}
|
||
|
|
isSigNaNB = f128M_isSignalingNaN( (const float128_t *) bWPtr );
|
||
|
|
if ( isSigNaNA | isSigNaNB ) {
|
||
|
|
softfloat_raiseFlags( softfloat_flag_invalid );
|
||
|
|
if ( isSigNaNA ) {
|
||
|
|
if ( isSigNaNB ) goto returnLargerUIMag;
|
||
|
|
if ( softfloat_isNaNF128M( bWPtr ) ) goto copyB;
|
||
|
|
goto copy;
|
||
|
|
} else {
|
||
|
|
if ( softfloat_isNaNF128M( aWPtr ) ) goto copy;
|
||
|
|
goto copyB;
|
||
|
|
}
|
||
|
|
}
|
||
|
|
returnLargerUIMag:
|
||
|
|
uiA96 = aWPtr[indexWordHi( 4 )];
|
||
|
|
uiB96 = bWPtr[indexWordHi( 4 )];
|
||
|
|
wordMagA = uiA96 & 0x7FFFFFFF;
|
||
|
|
wordMagB = uiB96 & 0x7FFFFFFF;
|
||
|
|
if ( wordMagA < wordMagB ) goto copyB;
|
||
|
|
if ( wordMagB < wordMagA ) goto copy;
|
||
|
|
wordMagA = aWPtr[indexWord( 4, 2 )];
|
||
|
|
wordMagB = bWPtr[indexWord( 4, 2 )];
|
||
|
|
if ( wordMagA < wordMagB ) goto copyB;
|
||
|
|
if ( wordMagB < wordMagA ) goto copy;
|
||
|
|
wordMagA = aWPtr[indexWord( 4, 1 )];
|
||
|
|
wordMagB = bWPtr[indexWord( 4, 1 )];
|
||
|
|
if ( wordMagA < wordMagB ) goto copyB;
|
||
|
|
if ( wordMagB < wordMagA ) goto copy;
|
||
|
|
wordMagA = aWPtr[indexWord( 4, 0 )];
|
||
|
|
wordMagB = bWPtr[indexWord( 4, 0 )];
|
||
|
|
if ( wordMagA < wordMagB ) goto copyB;
|
||
|
|
if ( wordMagB < wordMagA ) goto copy;
|
||
|
|
if ( uiA96 < uiB96 ) goto copy;
|
||
|
|
copyB:
|
||
|
|
ptr = bWPtr;
|
||
|
|
copy:
|
||
|
|
zWPtr[indexWordHi( 4 )] = ptr[indexWordHi( 4 )] | 0x00008000;
|
||
|
|
zWPtr[indexWord( 4, 2 )] = ptr[indexWord( 4, 2 )];
|
||
|
|
zWPtr[indexWord( 4, 1 )] = ptr[indexWord( 4, 1 )];
|
||
|
|
zWPtr[indexWord( 4, 0 )] = ptr[indexWord( 4, 0 )];
|
||
|
|
|
||
|
|
}
|
||
|
|
|