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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_shiftRightJam256M
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| 42 |
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| 43 | static
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| 44 | void
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| 45 | softfloat_shortShiftRightJamM(
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| 46 | uint_fast8_t size_words,
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| 47 | const uint64_t *aPtr,
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| 48 | uint_fast8_t dist,
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| 49 | uint64_t *zPtr
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| 50 | )
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| 51 | {
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| 52 | uint_fast8_t uNegDist;
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| 53 | unsigned int index, lastIndex;
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| 54 | uint64_t partWordZ, wordA;
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| 55 |
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| 56 | uNegDist = -dist;
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| 57 | index = indexWordLo( size_words );
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| 58 | lastIndex = indexWordHi( size_words );
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| 59 | wordA = aPtr[index];
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| 60 | partWordZ = wordA>>dist;
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| 61 | if ( partWordZ<<dist != wordA ) partWordZ |= 1;
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| 62 | while ( index != lastIndex ) {
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| 63 | wordA = aPtr[index + wordIncr];
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| 64 | zPtr[index] = wordA<<(uNegDist & 63) | partWordZ;
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| 65 | index += wordIncr;
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| 66 | partWordZ = wordA>>dist;
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| 67 | }
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| 68 | zPtr[index] = partWordZ;
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| 69 |
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| 70 | }
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| 71 |
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| 72 | void
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| 73 | softfloat_shiftRightJam256M(
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| 74 | const uint64_t *aPtr, uint_fast32_t dist, uint64_t *zPtr )
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| 75 | {
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| 76 | uint64_t wordJam;
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| 77 | uint_fast32_t wordDist;
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| 78 | uint64_t *ptr = (uint64_t *)0; /* vbox: shut up MSC warning */
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| 79 | uint_fast8_t i, innerDist;
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| 80 |
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| 81 | wordJam = 0;
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| 82 | wordDist = dist>>6;
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| 83 | if ( wordDist ) {
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| 84 | if ( 4 < wordDist ) wordDist = 4;
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| 85 | ptr = (uint64_t *) (aPtr + indexMultiwordLo( 4, wordDist ));
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| 86 | i = wordDist;
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| 87 | do {
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| 88 | wordJam = *ptr++;
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| 89 | if ( wordJam ) break;
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| 90 | --i;
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| 91 | } while ( i );
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| 92 | ptr = zPtr;
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| 93 | }
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| 94 | if ( wordDist < 4 ) {
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| 95 | aPtr += indexMultiwordHiBut( 4, wordDist );
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| 96 | innerDist = dist & 63;
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| 97 | if ( innerDist ) {
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| 98 | softfloat_shortShiftRightJamM(
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| 99 | 4 - wordDist,
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| 100 | aPtr,
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| 101 | innerDist,
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| 102 | zPtr + indexMultiwordLoBut( 4, wordDist )
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| 103 | );
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| 104 | if ( ! wordDist ) goto wordJam;
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| 105 | } else {
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| 106 | aPtr += indexWordLo( 4 - wordDist );
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| 107 | ptr = zPtr + indexWordLo( 4 );
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| 108 | for ( i = 4 - wordDist; i; --i ) {
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| 109 | *ptr = *aPtr;
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| 110 | aPtr += wordIncr;
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| 111 | ptr += wordIncr;
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| 112 | }
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| 113 | }
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| 114 | ptr = zPtr + indexMultiwordHi( 4, wordDist );
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| 115 | }
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| 116 | do {
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| 117 | *ptr++ = 0;
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| 118 | --wordDist;
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| 119 | } while ( wordDist );
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| 120 | wordJam:
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| 121 | if ( wordJam ) zPtr[indexWordLo( 4 )] |= 1;
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| 122 |
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| 123 | }
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| 124 |
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| 125 | #endif
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| 126 |
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