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https://github.com/openhwgroup/cvw
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87 lines
3.2 KiB
C
87 lines
3.2 KiB
C
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/*============================================================================
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This C source file is part of the SoftFloat IEEE Floating-Point Arithmetic
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Package, Release 3e, by John R. Hauser.
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Copyright 2011, 2012, 2013, 2014, 2015, 2016 The Regents of the University of
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California. All rights reserved.
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Redistribution and use in source and binary forms, with or without
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modification, are permitted provided that the following conditions are met:
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1. Redistributions of source code must retain the above copyright notice,
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this list of conditions, and the following disclaimer.
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2. Redistributions in binary form must reproduce the above copyright notice,
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this list of conditions, and the following disclaimer in the documentation
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and/or other materials provided with the distribution.
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3. Neither the name of the University nor the names of its contributors may
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be used to endorse or promote products derived from this software without
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specific prior written permission.
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THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS "AS IS", AND ANY
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EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
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WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE, ARE
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DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE FOR ANY
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DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
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(INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
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LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
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ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
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SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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=============================================================================*/
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#include <stdint.h>
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#include "platform.h"
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#include "primitiveTypes.h"
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#ifndef softfloat_remStepMBy32
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void
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softfloat_remStepMBy32(
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uint_fast8_t size_words,
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const uint32_t *remPtr,
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uint_fast8_t dist,
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const uint32_t *bPtr,
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uint32_t q,
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uint32_t *zPtr
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)
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{
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unsigned int index, lastIndex;
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uint64_t dwordProd;
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uint32_t wordRem, wordShiftedRem, wordProd;
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uint_fast8_t uNegDist, borrow;
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index = indexWordLo( size_words );
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lastIndex = indexWordHi( size_words );
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dwordProd = (uint64_t) bPtr[index] * q;
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wordRem = remPtr[index];
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wordShiftedRem = wordRem<<dist;
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wordProd = dwordProd;
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zPtr[index] = wordShiftedRem - wordProd;
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if ( index != lastIndex ) {
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uNegDist = -dist;
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borrow = (wordShiftedRem < wordProd);
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for (;;) {
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wordShiftedRem = wordRem>>(uNegDist & 31);
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index += wordIncr;
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dwordProd = (uint64_t) bPtr[index] * q + (dwordProd>>32);
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wordRem = remPtr[index];
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wordShiftedRem |= wordRem<<dist;
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wordProd = dwordProd;
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zPtr[index] = wordShiftedRem - wordProd - borrow;
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if ( index == lastIndex ) break;
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borrow =
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borrow ? (wordShiftedRem <= wordProd)
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: (wordShiftedRem < wordProd);
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}
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}
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}
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#endif
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