| 1 | /*
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| 2 | * Copyright (c) 2011 Petr Koupy
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| 3 | * All rights reserved.
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| 4 | *
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| 5 | * Redistribution and use in source and binary forms, with or without
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| 6 | * modification, are permitted provided that the following conditions
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| 7 | * are met:
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| 8 | *
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| 9 | * - Redistributions of source code must retain the above copyright
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| 10 | * notice, this list of conditions and the following disclaimer.
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| 11 | * - Redistributions in binary form must reproduce the above copyright
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| 12 | * notice, this list of conditions and the following disclaimer in the
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| 13 | * documentation and/or other materials provided with the distribution.
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| 14 | * - The name of the author may not be used to endorse or promote products
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| 15 | * derived from this software without specific prior written permission.
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| 16 | *
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| 17 | * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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| 18 | * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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| 19 | * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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| 20 | * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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| 21 | * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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| 22 | * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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| 23 | * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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| 24 | * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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| 25 | * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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| 26 | * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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| 27 | */
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| 28 |
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| 29 | /** @addtogroup softint
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| 30 | * @{
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| 31 | */
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| 32 | /**
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| 33 | * @file Logical and arithmetic shifts.
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| 34 | */
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| 35 |
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| 36 | #include <shift.h>
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| 37 | #include <lltype.h>
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| 38 |
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| 39 | long long __ashldi3 (long long val, int shift)
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| 40 | {
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| 41 | union lltype ll;
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| 42 |
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| 43 | ll.s_whole = val;
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| 44 |
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| 45 | if (shift <= 0) {
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| 46 | return ll.s_whole;
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| 47 | }
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| 48 |
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| 49 | if (shift >= (int) WHOLE_BIT_CNT) {
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| 50 | ll.u_half[HI] = 0;
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| 51 | ll.u_half[LO] = 0;
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| 52 | return ll.s_whole;
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| 53 | }
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| 54 |
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| 55 | if (shift >= (int) HALF_BIT_CNT) {
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| 56 | ll.u_half[HI] = ll.u_half[LO] << (shift - HALF_BIT_CNT);
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| 57 | ll.u_half[LO] = 0;
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| 58 | } else {
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| 59 | ll.u_half[HI] <<= shift;
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| 60 | ll.u_half[HI] |= ll.u_half[LO] >> (HALF_BIT_CNT - shift);
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| 61 | ll.u_half[LO] <<= shift;
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| 62 | }
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| 63 |
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| 64 | return ll.s_whole;
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| 65 | }
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| 66 |
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| 67 | long long __ashrdi3 (long long val, int shift)
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| 68 | {
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| 69 | union lltype ll;
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| 70 |
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| 71 | ll.s_whole = val;
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| 72 |
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| 73 | if (shift <= 0) {
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| 74 | return ll.s_whole;
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| 75 | }
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| 76 |
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| 77 | long fill = ll.s_half[HI] >> (HALF_BIT_CNT - 1);
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| 78 |
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| 79 | if (shift >= (int) WHOLE_BIT_CNT) {
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| 80 | ll.s_half[HI] = fill;
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| 81 | ll.s_half[LO] = fill;
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| 82 | return ll.s_whole;
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| 83 | }
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| 84 |
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| 85 | if (shift >= (int) HALF_BIT_CNT) {
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| 86 | ll.s_half[LO] = ll.s_half[HI] >> (shift - HALF_BIT_CNT);
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| 87 | ll.s_half[HI] = fill;
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| 88 | } else {
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| 89 | ll.u_half[LO] >>= shift;
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| 90 | ll.u_half[LO] |= ll.u_half[HI] << (HALF_BIT_CNT - shift);
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| 91 | ll.s_half[HI] >>= shift;
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| 92 | }
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| 93 |
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| 94 | return ll.s_whole;
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| 95 | }
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| 96 |
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| 97 | long long __lshrdi3 (long long val, int shift)
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| 98 | {
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| 99 | union lltype ll;
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| 100 |
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| 101 | ll.s_whole = val;
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| 102 |
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| 103 | if (shift <= 0) {
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| 104 | return ll.s_whole;
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| 105 | }
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| 106 |
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| 107 | if (shift >= (int) WHOLE_BIT_CNT) {
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| 108 | ll.u_half[HI] = 0;
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| 109 | ll.u_half[LO] = 0;
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| 110 | return ll.s_whole;
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| 111 | }
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| 112 |
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| 113 | if (shift >= (int) HALF_BIT_CNT) {
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| 114 | ll.u_half[LO] = ll.u_half[HI] >> (shift - HALF_BIT_CNT);
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| 115 | ll.u_half[HI] = 0;
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| 116 | } else {
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| 117 | ll.u_half[LO] >>= shift;
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| 118 | ll.u_half[LO] |= ll.u_half[HI] << (HALF_BIT_CNT - shift);
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| 119 | ll.u_half[HI] >>= shift;
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| 120 | }
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| 121 |
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| 122 | return ll.s_whole;
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| 123 | }
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| 124 |
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| 125 | /** @}
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| 126 | */
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