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| 2 | /*============================================================================
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| 3 |
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| 4 | This C source file is part of the SoftFloat IEEE Floating-Point Arithmetic
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| 5 | Package, Release 3e, by John R. Hauser.
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| 6 |
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| 7 | Copyright 2011, 2012, 2013, 2014, 2015, 2016 The Regents of the University of
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| 8 | California. All rights reserved.
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| 9 |
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| 10 | Redistribution and use in source and binary forms, with or without
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| 11 | modification, are permitted provided that the following conditions are met:
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| 12 |
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| 13 | 1. Redistributions of source code must retain the above copyright notice,
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| 14 | this list of conditions, and the following disclaimer.
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| 15 |
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| 16 | 2. Redistributions in binary form must reproduce the above copyright notice,
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| 17 | this list of conditions, and the following disclaimer in the documentation
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| 18 | and/or other materials provided with the distribution.
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| 19 |
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| 20 | 3. Neither the name of the University nor the names of its contributors may
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| 21 | be used to endorse or promote products derived from this software without
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| 22 | specific prior written permission.
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| 23 |
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| 24 | THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS "AS IS", AND ANY
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| 25 | EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
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| 26 | WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE, ARE
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| 27 | DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE FOR ANY
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| 28 | DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
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| 29 | (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
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| 30 | LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
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| 31 | ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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| 32 | (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
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| 33 | SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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| 34 |
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| 35 | =============================================================================*/
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| 36 |
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| 37 | #include <stdint.h>
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| 38 | #include "platform.h"
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| 39 | #include "primitiveTypes.h"
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| 40 |
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| 41 | #ifndef softfloat_remStepMBy32
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| 42 |
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| 43 | void
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| 44 | softfloat_remStepMBy32(
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| 45 | uint_fast8_t size_words,
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| 46 | const uint32_t *remPtr,
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| 47 | uint_fast8_t dist,
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| 48 | const uint32_t *bPtr,
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| 49 | uint32_t q,
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| 50 | uint32_t *zPtr
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| 51 | )
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| 52 | {
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| 53 | unsigned int index, lastIndex;
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| 54 | uint64_t dwordProd;
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| 55 | uint32_t wordRem, wordShiftedRem, wordProd;
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| 56 | uint_fast8_t uNegDist, borrow;
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| 57 |
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| 58 | index = indexWordLo( size_words );
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| 59 | lastIndex = indexWordHi( size_words );
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| 60 | dwordProd = (uint64_t) bPtr[index] * q;
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| 61 | wordRem = remPtr[index];
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| 62 | wordShiftedRem = wordRem<<dist;
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| 63 | wordProd = dwordProd;
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| 64 | zPtr[index] = wordShiftedRem - wordProd;
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| 65 | if ( index != lastIndex ) {
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| 66 | uNegDist = -dist;
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| 67 | borrow = (wordShiftedRem < wordProd);
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| 68 | for (;;) {
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| 69 | wordShiftedRem = wordRem>>(uNegDist & 31);
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| 70 | index += wordIncr;
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| 71 | dwordProd = (uint64_t) bPtr[index] * q + (dwordProd>>32);
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| 72 | wordRem = remPtr[index];
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| 73 | wordShiftedRem |= wordRem<<dist;
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| 74 | wordProd = dwordProd;
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| 75 | zPtr[index] = wordShiftedRem - wordProd - borrow;
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| 76 | if ( index == lastIndex ) break;
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| 77 | borrow =
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| 78 | borrow ? (wordShiftedRem <= wordProd)
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| 79 | : (wordShiftedRem < wordProd);
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| 80 | }
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| 81 | }
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| 82 |
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| 83 | }
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| 84 |
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| 85 | #endif
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| 86 |
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