mirror of
https://github.com/openhwgroup/cvw
synced 2025-02-11 06:05:49 +00:00
71 lines
2.5 KiB
C
71 lines
2.5 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 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"
|
|
#include "primitiveTypes.h"
|
|
|
|
#ifndef softfloat_subM
|
|
|
|
void
|
|
softfloat_subM(
|
|
uint_fast8_t size_words,
|
|
const uint32_t *aPtr,
|
|
const uint32_t *bPtr,
|
|
uint32_t *zPtr
|
|
)
|
|
{
|
|
unsigned int index, lastIndex;
|
|
uint_fast8_t borrow;
|
|
uint32_t wordA, wordB;
|
|
|
|
index = indexWordLo( size_words );
|
|
lastIndex = indexWordHi( size_words );
|
|
borrow = 0;
|
|
for (;;) {
|
|
wordA = aPtr[index];
|
|
wordB = bPtr[index];
|
|
zPtr[index] = wordA - wordB - borrow;
|
|
if ( index == lastIndex ) break;
|
|
borrow = borrow ? (wordA <= wordB) : (wordA < wordB);
|
|
index += wordIncr;
|
|
}
|
|
|
|
}
|
|
|
|
#endif
|
|
|