| |
| /*============================================================================ |
| |
| 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" |
| #include "primitiveTypes.h" |
| |
| #ifndef softfloat_remStepMBy32 |
| |
| void |
| softfloat_remStepMBy32( |
| uint_fast8_t size_words, |
| const uint32_t *remPtr, |
| uint_fast8_t count, |
| const uint32_t *bPtr, |
| uint32_t q, |
| uint32_t *zPtr |
| ) |
| { |
| uint_fast8_t negCount; |
| unsigned int index, lastIndex; |
| uint64_t dwordProd; |
| uint32_t wordRem, wordShiftedRem, wordProd; |
| uint_fast8_t borrow; |
| |
| negCount = -count; |
| index = indexWordLo( size_words ); |
| lastIndex = indexWordHi( size_words ); |
| dwordProd = (uint64_t) bPtr[index] * q; |
| wordRem = remPtr[index]; |
| wordShiftedRem = wordRem<<count; |
| wordProd = dwordProd; |
| zPtr[index] = wordShiftedRem - wordProd; |
| if ( index != lastIndex ) { |
| borrow = (wordShiftedRem < wordProd); |
| for (;;) { |
| wordShiftedRem = wordRem>>(negCount & 31); |
| index += wordIncr; |
| dwordProd = (uint64_t) bPtr[index] * q + (dwordProd>>32); |
| wordRem = remPtr[index]; |
| wordShiftedRem |= wordRem<<count; |
| wordProd = dwordProd; |
| zPtr[index] = wordShiftedRem - wordProd - borrow; |
| if ( index == lastIndex ) break; |
| borrow = |
| borrow ? (wordShiftedRem <= wordProd) |
| : (wordShiftedRem < wordProd); |
| } |
| } |
| |
| } |
| |
| #endif |
| |