102 lines
3.4 KiB
C
102 lines
3.4 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 <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 dist,
|
|
uint32_t *zPtr
|
|
)
|
|
{
|
|
uint32_t wordJam, wordDist, *ptr;
|
|
uint_fast8_t i, innerDist;
|
|
|
|
wordJam = 0;
|
|
wordDist = dist>>5;
|
|
if ( wordDist ) {
|
|
if ( size_words < wordDist ) wordDist = size_words;
|
|
ptr = (uint32_t *) (aPtr + indexMultiwordLo( size_words, wordDist ));
|
|
i = wordDist;
|
|
do {
|
|
wordJam = *ptr++;
|
|
if ( wordJam ) break;
|
|
--i;
|
|
} while ( i );
|
|
ptr = zPtr;
|
|
}
|
|
if ( wordDist < size_words ) {
|
|
aPtr += indexMultiwordHiBut( size_words, wordDist );
|
|
innerDist = dist & 31;
|
|
if ( innerDist ) {
|
|
softfloat_shortShiftRightJamM(
|
|
size_words - wordDist,
|
|
aPtr,
|
|
innerDist,
|
|
zPtr + indexMultiwordLoBut( size_words, wordDist )
|
|
);
|
|
if ( ! wordDist ) goto wordJam;
|
|
} else {
|
|
aPtr += indexWordLo( size_words - wordDist );
|
|
ptr = zPtr + indexWordLo( size_words );
|
|
for ( i = size_words - wordDist; i; --i ) {
|
|
*ptr = *aPtr;
|
|
aPtr += wordIncr;
|
|
ptr += wordIncr;
|
|
}
|
|
}
|
|
ptr = zPtr + indexMultiwordHi( size_words, wordDist );
|
|
}
|
|
do {
|
|
*ptr++ = 0;
|
|
--wordDist;
|
|
} while ( wordDist );
|
|
wordJam:
|
|
if ( wordJam ) zPtr[indexWordLo( size_words )] |= 1;
|
|
|
|
}
|
|
|
|
#endif
|
|
|