mirror of
https://github.com/urbit/shrub.git
synced 2024-12-19 00:13:12 +03:00
99 lines
3.4 KiB
C
99 lines
3.4 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, 2015 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 <stdint.h>
|
|
#include "platform.h"
|
|
|
|
#ifndef softfloat_shiftRightJamM
|
|
|
|
#define softfloat_shiftRightJamM softfloat_shiftRightJamM
|
|
#include "primitives.h"
|
|
|
|
void
|
|
softfloat_shiftRightJamM(
|
|
uint_fast8_t size_words,
|
|
const uint32_t *aPtr,
|
|
uint32_t count,
|
|
uint32_t *zPtr
|
|
)
|
|
{
|
|
uint32_t wordJam, wordCount, *ptr;
|
|
uint_fast8_t i, innerCount;
|
|
|
|
wordJam = 0;
|
|
wordCount = count>>5;
|
|
if ( wordCount ) {
|
|
if ( size_words < wordCount ) wordCount = size_words;
|
|
ptr = (uint32_t *) (aPtr + indexMultiwordLo( size_words, wordCount ));
|
|
i = wordCount;
|
|
do {
|
|
wordJam = *ptr++;
|
|
if ( wordJam ) break;
|
|
--i;
|
|
} while ( i );
|
|
ptr = zPtr;
|
|
}
|
|
if ( wordCount < size_words ) {
|
|
aPtr += indexMultiwordHiBut( size_words, wordCount );
|
|
innerCount = count & 31;
|
|
if ( innerCount ) {
|
|
softfloat_shortShiftRightJamM(
|
|
size_words - wordCount,
|
|
aPtr,
|
|
innerCount,
|
|
zPtr + indexMultiwordLoBut( size_words, wordCount )
|
|
);
|
|
if ( ! wordCount ) goto wordJam;
|
|
} else {
|
|
aPtr += indexWordLo( size_words - wordCount );
|
|
ptr = zPtr + indexWordLo( size_words );
|
|
for ( i = size_words - wordCount; i; --i ) {
|
|
*ptr = *aPtr;
|
|
aPtr += wordIncr;
|
|
ptr += wordIncr;
|
|
}
|
|
}
|
|
ptr = zPtr + indexMultiwordHi( size_words, wordCount );
|
|
}
|
|
do {
|
|
*ptr++ = 0;
|
|
--wordCount;
|
|
} while ( wordCount );
|
|
wordJam:
|
|
if ( wordJam ) zPtr[indexWordLo( size_words )] |= 1;
|
|
|
|
}
|
|
|
|
#endif
|
|
|