| [27a8d1d] | 1 | /*
|
|---|
| 2 | * Copyright (c) 2011 Petr Koupy
|
|---|
| 3 | * All rights reserved.
|
|---|
| 4 | *
|
|---|
| 5 | * Redistribution and use in source and binary forms, with or without
|
|---|
| 6 | * modification, are permitted provided that the following conditions
|
|---|
| 7 | * are met:
|
|---|
| 8 | *
|
|---|
| 9 | * - Redistributions of source code must retain the above copyright
|
|---|
| 10 | * notice, this list of conditions and the following disclaimer.
|
|---|
| 11 | * - Redistributions in binary form must reproduce the above copyright
|
|---|
| 12 | * notice, this list of conditions and the following disclaimer in the
|
|---|
| 13 | * documentation and/or other materials provided with the distribution.
|
|---|
| 14 | * - The name of the author may not be used to endorse or promote products
|
|---|
| 15 | * derived from this software without specific prior written permission.
|
|---|
| 16 | *
|
|---|
| 17 | * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
|
|---|
| 18 | * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
|
|---|
| 19 | * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
|
|---|
| 20 | * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
|
|---|
| 21 | * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
|
|---|
| 22 | * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
|
|---|
| 23 | * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
|
|---|
| 24 | * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
|
|---|
| 25 | * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
|
|---|
| 26 | * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
|
|---|
| 27 | */
|
|---|
| 28 |
|
|---|
| 29 | /** @addtogroup softint
|
|---|
| 30 | * @{
|
|---|
| 31 | */
|
|---|
| 32 | /**
|
|---|
| 33 | * @file Logical and arithmetic shifts.
|
|---|
| 34 | */
|
|---|
| 35 |
|
|---|
| [8348846] | 36 | #include <alias.h>
|
|---|
| [27a8d1d] | 37 | #include <shift.h>
|
|---|
| 38 | #include <lltype.h>
|
|---|
| 39 |
|
|---|
| [8348846] | 40 | long long __ashlti3 (long long val, int shift)
|
|---|
| [27a8d1d] | 41 | {
|
|---|
| 42 | union lltype ll;
|
|---|
| 43 |
|
|---|
| 44 | ll.s_whole = val;
|
|---|
| 45 |
|
|---|
| 46 | if (shift <= 0) {
|
|---|
| 47 | return ll.s_whole;
|
|---|
| 48 | }
|
|---|
| 49 |
|
|---|
| 50 | if (shift >= (int) WHOLE_BIT_CNT) {
|
|---|
| 51 | ll.u_half[HI] = 0;
|
|---|
| 52 | ll.u_half[LO] = 0;
|
|---|
| 53 | return ll.s_whole;
|
|---|
| 54 | }
|
|---|
| 55 |
|
|---|
| 56 | if (shift >= (int) HALF_BIT_CNT) {
|
|---|
| 57 | ll.u_half[HI] = ll.u_half[LO] << (shift - HALF_BIT_CNT);
|
|---|
| 58 | ll.u_half[LO] = 0;
|
|---|
| 59 | } else {
|
|---|
| 60 | ll.u_half[HI] <<= shift;
|
|---|
| 61 | ll.u_half[HI] |= ll.u_half[LO] >> (HALF_BIT_CNT - shift);
|
|---|
| 62 | ll.u_half[LO] <<= shift;
|
|---|
| 63 | }
|
|---|
| 64 |
|
|---|
| 65 | return ll.s_whole;
|
|---|
| 66 | }
|
|---|
| 67 |
|
|---|
| [8348846] | 68 | long long __ashrti3 (long long val, int shift)
|
|---|
| [27a8d1d] | 69 | {
|
|---|
| 70 | union lltype ll;
|
|---|
| 71 |
|
|---|
| 72 | ll.s_whole = val;
|
|---|
| 73 |
|
|---|
| 74 | if (shift <= 0) {
|
|---|
| 75 | return ll.s_whole;
|
|---|
| 76 | }
|
|---|
| 77 |
|
|---|
| 78 | long fill = ll.s_half[HI] >> (HALF_BIT_CNT - 1);
|
|---|
| 79 |
|
|---|
| 80 | if (shift >= (int) WHOLE_BIT_CNT) {
|
|---|
| 81 | ll.s_half[HI] = fill;
|
|---|
| 82 | ll.s_half[LO] = fill;
|
|---|
| 83 | return ll.s_whole;
|
|---|
| 84 | }
|
|---|
| 85 |
|
|---|
| 86 | if (shift >= (int) HALF_BIT_CNT) {
|
|---|
| 87 | ll.s_half[LO] = ll.s_half[HI] >> (shift - HALF_BIT_CNT);
|
|---|
| 88 | ll.s_half[HI] = fill;
|
|---|
| 89 | } else {
|
|---|
| 90 | ll.u_half[LO] >>= shift;
|
|---|
| 91 | ll.u_half[LO] |= ll.u_half[HI] << (HALF_BIT_CNT - shift);
|
|---|
| 92 | ll.s_half[HI] >>= shift;
|
|---|
| 93 | }
|
|---|
| 94 |
|
|---|
| 95 | return ll.s_whole;
|
|---|
| 96 | }
|
|---|
| 97 |
|
|---|
| [8348846] | 98 | long long __lshrti3 (long long val, int shift)
|
|---|
| [27a8d1d] | 99 | {
|
|---|
| 100 | union lltype ll;
|
|---|
| 101 |
|
|---|
| 102 | ll.s_whole = val;
|
|---|
| 103 |
|
|---|
| 104 | if (shift <= 0) {
|
|---|
| 105 | return ll.s_whole;
|
|---|
| 106 | }
|
|---|
| 107 |
|
|---|
| 108 | if (shift >= (int) WHOLE_BIT_CNT) {
|
|---|
| 109 | ll.u_half[HI] = 0;
|
|---|
| 110 | ll.u_half[LO] = 0;
|
|---|
| 111 | return ll.s_whole;
|
|---|
| 112 | }
|
|---|
| 113 |
|
|---|
| 114 | if (shift >= (int) HALF_BIT_CNT) {
|
|---|
| 115 | ll.u_half[LO] = ll.u_half[HI] >> (shift - HALF_BIT_CNT);
|
|---|
| 116 | ll.u_half[HI] = 0;
|
|---|
| 117 | } else {
|
|---|
| 118 | ll.u_half[LO] >>= shift;
|
|---|
| 119 | ll.u_half[LO] |= ll.u_half[HI] << (HALF_BIT_CNT - shift);
|
|---|
| 120 | ll.u_half[HI] >>= shift;
|
|---|
| 121 | }
|
|---|
| 122 |
|
|---|
| 123 | return ll.s_whole;
|
|---|
| 124 | }
|
|---|
| 125 |
|
|---|
| [5f9768bb] | 126 | long long __aeabi_llsl(long long val, int shift)
|
|---|
| 127 | {
|
|---|
| 128 | return __ashldi3(val, shift);
|
|---|
| 129 | }
|
|---|
| 130 |
|
|---|
| [80f6be9] | 131 | long long __aeabi_llsr(long long val, int shift)
|
|---|
| 132 | {
|
|---|
| 133 | return __lshrdi3(val, shift);
|
|---|
| 134 | }
|
|---|
| 135 |
|
|---|
| [8348846] | 136 | #if LONG_MAX == LLONG_MAX
|
|---|
| 137 | long ALIAS(__ashl, i3);
|
|---|
| 138 | long ALIAS(__ashr, i3);
|
|---|
| 139 | long ALIAS(__lshr, i3);
|
|---|
| 140 | #endif
|
|---|
| 141 |
|
|---|
| [27a8d1d] | 142 | /** @}
|
|---|
| 143 | */
|
|---|
