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Diffstat (limited to '')
-rw-r--r-- | src/libs/softfloat-3e/source/s_remStepMBy32.c | 86 |
1 files changed, 86 insertions, 0 deletions
diff --git a/src/libs/softfloat-3e/source/s_remStepMBy32.c b/src/libs/softfloat-3e/source/s_remStepMBy32.c new file mode 100644 index 00000000..0f249b90 --- /dev/null +++ b/src/libs/softfloat-3e/source/s_remStepMBy32.c @@ -0,0 +1,86 @@ + +/*============================================================================ + +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" +#include "primitiveTypes.h" + +#ifndef softfloat_remStepMBy32 + +void + softfloat_remStepMBy32( + uint_fast8_t size_words, + const uint32_t *remPtr, + uint_fast8_t dist, + const uint32_t *bPtr, + uint32_t q, + uint32_t *zPtr + ) +{ + unsigned int index, lastIndex; + uint64_t dwordProd; + uint32_t wordRem, wordShiftedRem, wordProd; + uint_fast8_t uNegDist, borrow; + + index = indexWordLo( size_words ); + lastIndex = indexWordHi( size_words ); + dwordProd = (uint64_t) bPtr[index] * q; + wordRem = remPtr[index]; + wordShiftedRem = wordRem<<dist; + wordProd = dwordProd; + zPtr[index] = wordShiftedRem - wordProd; + if ( index != lastIndex ) { + uNegDist = -dist; + borrow = (wordShiftedRem < wordProd); + for (;;) { + wordShiftedRem = wordRem>>(uNegDist & 31); + index += wordIncr; + dwordProd = (uint64_t) bPtr[index] * q + (dwordProd>>32); + wordRem = remPtr[index]; + wordShiftedRem |= wordRem<<dist; + wordProd = dwordProd; + zPtr[index] = wordShiftedRem - wordProd - borrow; + if ( index == lastIndex ) break; + borrow = + borrow ? (wordShiftedRem <= wordProd) + : (wordShiftedRem < wordProd); + } + } + +} + +#endif + |