Haibo Huang | ece43e1 | 2018-05-26 13:07:43 -0700 | [diff] [blame] | 1 | /* Copyright (c) 2013, Linaro Limited |
Bernhard Rosenkraenzer | 7e4fa56 | 2014-03-05 11:40:57 +0100 | [diff] [blame] | 2 | All rights reserved. |
| 3 | |
| 4 | Redistribution and use in source and binary forms, with or without |
| 5 | modification, are permitted provided that the following conditions are met: |
| 6 | * Redistributions of source code must retain the above copyright |
| 7 | notice, this list of conditions and the following disclaimer. |
| 8 | * Redistributions in binary form must reproduce the above copyright |
| 9 | notice, this list of conditions and the following disclaimer in the |
| 10 | documentation and/or other materials provided with the distribution. |
| 11 | * Neither the name of the Linaro nor the |
| 12 | names of its contributors may be used to endorse or promote products |
| 13 | derived from this software without specific prior written permission. |
| 14 | |
| 15 | THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS |
| 16 | "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT |
| 17 | LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR |
| 18 | A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT |
| 19 | HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, |
| 20 | SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT |
| 21 | LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, |
| 22 | DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY |
| 23 | THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
| 24 | (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE |
Haibo Huang | ece43e1 | 2018-05-26 13:07:43 -0700 | [diff] [blame] | 25 | OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. */ |
| 26 | |
| 27 | /* |
| 28 | * Copyright (c) 2015 ARM Ltd |
| 29 | * All rights reserved. |
| 30 | * |
| 31 | * Redistribution and use in source and binary forms, with or without |
| 32 | * modification, are permitted provided that the following conditions |
| 33 | * are met: |
| 34 | * 1. Redistributions of source code must retain the above copyright |
| 35 | * notice, this list of conditions and the following disclaimer. |
| 36 | * 2. Redistributions in binary form must reproduce the above copyright |
| 37 | * notice, this list of conditions and the following disclaimer in the |
| 38 | * documentation and/or other materials provided with the distribution. |
| 39 | * 3. The name of the company may not be used to endorse or promote |
| 40 | * products derived from this software without specific prior written |
| 41 | * permission. |
| 42 | * |
| 43 | * THIS SOFTWARE IS PROVIDED BY ARM LTD ``AS IS'' AND ANY EXPRESS OR IMPLIED |
| 44 | * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF |
| 45 | * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. |
| 46 | * IN NO EVENT SHALL ARM LTD BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, |
| 47 | * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED |
| 48 | * TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR |
| 49 | * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF |
| 50 | * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING |
| 51 | * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS |
| 52 | * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
| 53 | */ |
Bernhard Rosenkraenzer | 7e4fa56 | 2014-03-05 11:40:57 +0100 | [diff] [blame] | 54 | |
| 55 | /* Assumptions: |
| 56 | * |
Haibo Huang | ece43e1 | 2018-05-26 13:07:43 -0700 | [diff] [blame] | 57 | * ARMv8-a, AArch64, unaligned accesses, wchar_t is 4 bytes |
Bernhard Rosenkraenzer | 7e4fa56 | 2014-03-05 11:40:57 +0100 | [diff] [blame] | 58 | */ |
| 59 | |
| 60 | #include <private/bionic_asm.h> |
| 61 | |
| 62 | /* Parameters and result. */ |
| 63 | #define dstin x0 |
| 64 | #define src x1 |
| 65 | #define count x2 |
Haibo Huang | ece43e1 | 2018-05-26 13:07:43 -0700 | [diff] [blame] | 66 | #define srcend x3 |
| 67 | #define dstend x4 |
| 68 | #define tmp1 x5 |
| 69 | #define A_l x6 |
| 70 | #define A_h x7 |
| 71 | #define B_l x8 |
| 72 | #define B_h x9 |
| 73 | #define C_l x10 |
| 74 | #define C_h x11 |
| 75 | #define D_l x12 |
| 76 | #define D_h x13 |
| 77 | #define E_l count |
| 78 | #define E_h tmp1 |
Bernhard Rosenkraenzer | 7e4fa56 | 2014-03-05 11:40:57 +0100 | [diff] [blame] | 79 | |
Haibo Huang | ece43e1 | 2018-05-26 13:07:43 -0700 | [diff] [blame] | 80 | /* All memmoves up to 96 bytes are done by memcpy as it supports overlaps. |
| 81 | Larger backwards copies are also handled by memcpy. The only remaining |
| 82 | case is forward large copies. The destination is aligned, and an |
| 83 | unrolled loop processes 64 bytes per iteration. |
| 84 | */ |
Bernhard Rosenkraenzer | 7e4fa56 | 2014-03-05 11:40:57 +0100 | [diff] [blame] | 85 | |
Jake Weinstein | 2926f9a | 2015-08-16 00:44:40 +0000 | [diff] [blame] | 86 | #if defined(WMEMMOVE) |
Bernhard Rosenkraenzer | 6f2bde3 | 2014-05-23 17:44:18 +0200 | [diff] [blame] | 87 | ENTRY(wmemmove) |
| 88 | lsl count, count, #2 |
| 89 | #else |
Bernhard Rosenkraenzer | 7e4fa56 | 2014-03-05 11:40:57 +0100 | [diff] [blame] | 90 | ENTRY(memmove) |
Bernhard Rosenkraenzer | 6f2bde3 | 2014-05-23 17:44:18 +0200 | [diff] [blame] | 91 | #endif |
Haibo Huang | ece43e1 | 2018-05-26 13:07:43 -0700 | [diff] [blame] | 92 | sub tmp1, dstin, src |
| 93 | cmp count, 96 |
| 94 | ccmp tmp1, count, 2, hi |
| 95 | b.hs memcpy |
Bernhard Rosenkraenzer | 7e4fa56 | 2014-03-05 11:40:57 +0100 | [diff] [blame] | 96 | |
Haibo Huang | ece43e1 | 2018-05-26 13:07:43 -0700 | [diff] [blame] | 97 | cbz tmp1, 3f |
| 98 | add dstend, dstin, count |
| 99 | add srcend, src, count |
Bernhard Rosenkraenzer | 7e4fa56 | 2014-03-05 11:40:57 +0100 | [diff] [blame] | 100 | |
Haibo Huang | ece43e1 | 2018-05-26 13:07:43 -0700 | [diff] [blame] | 101 | /* Align dstend to 16 byte alignment so that we don't cross cache line |
| 102 | boundaries on both loads and stores. There are at least 96 bytes |
| 103 | to copy, so copy 16 bytes unaligned and then align. The loop |
| 104 | copies 64 bytes per iteration and prefetches one iteration ahead. */ |
| 105 | |
| 106 | and tmp1, dstend, 15 |
| 107 | ldp D_l, D_h, [srcend, -16] |
| 108 | sub srcend, srcend, tmp1 |
| 109 | sub count, count, tmp1 |
| 110 | ldp A_l, A_h, [srcend, -16] |
| 111 | stp D_l, D_h, [dstend, -16] |
| 112 | ldp B_l, B_h, [srcend, -32] |
| 113 | ldp C_l, C_h, [srcend, -48] |
| 114 | ldp D_l, D_h, [srcend, -64]! |
| 115 | sub dstend, dstend, tmp1 |
| 116 | subs count, count, 128 |
| 117 | b.ls 2f |
| 118 | nop |
Bernhard Rosenkraenzer | 7e4fa56 | 2014-03-05 11:40:57 +0100 | [diff] [blame] | 119 | 1: |
Haibo Huang | ece43e1 | 2018-05-26 13:07:43 -0700 | [diff] [blame] | 120 | stp A_l, A_h, [dstend, -16] |
| 121 | ldp A_l, A_h, [srcend, -16] |
| 122 | stp B_l, B_h, [dstend, -32] |
| 123 | ldp B_l, B_h, [srcend, -32] |
| 124 | stp C_l, C_h, [dstend, -48] |
| 125 | ldp C_l, C_h, [srcend, -48] |
| 126 | stp D_l, D_h, [dstend, -64]! |
| 127 | ldp D_l, D_h, [srcend, -64]! |
| 128 | subs count, count, 64 |
| 129 | b.hi 1b |
| 130 | |
| 131 | /* Write the last full set of 64 bytes. The remainder is at most 64 |
| 132 | bytes, so it is safe to always copy 64 bytes from the start even if |
| 133 | there is just 1 byte left. */ |
Bernhard Rosenkraenzer | 7e4fa56 | 2014-03-05 11:40:57 +0100 | [diff] [blame] | 134 | 2: |
Haibo Huang | ece43e1 | 2018-05-26 13:07:43 -0700 | [diff] [blame] | 135 | ldp E_l, E_h, [src, 48] |
| 136 | stp A_l, A_h, [dstend, -16] |
| 137 | ldp A_l, A_h, [src, 32] |
| 138 | stp B_l, B_h, [dstend, -32] |
| 139 | ldp B_l, B_h, [src, 16] |
| 140 | stp C_l, C_h, [dstend, -48] |
| 141 | ldp C_l, C_h, [src] |
| 142 | stp D_l, D_h, [dstend, -64] |
| 143 | stp E_l, E_h, [dstin, 48] |
| 144 | stp A_l, A_h, [dstin, 32] |
| 145 | stp B_l, B_h, [dstin, 16] |
| 146 | stp C_l, C_h, [dstin] |
| 147 | 3: ret |
Bernhard Rosenkraenzer | 7e4fa56 | 2014-03-05 11:40:57 +0100 | [diff] [blame] | 148 | |
Jake Weinstein | 2926f9a | 2015-08-16 00:44:40 +0000 | [diff] [blame] | 149 | #if defined(WMEMMOVE) |
Bernhard Rosenkraenzer | 6f2bde3 | 2014-05-23 17:44:18 +0200 | [diff] [blame] | 150 | END(wmemmove) |
| 151 | #else |
Bernhard Rosenkraenzer | 7e4fa56 | 2014-03-05 11:40:57 +0100 | [diff] [blame] | 152 | END(memmove) |
Bernhard Rosenkraenzer | 6f2bde3 | 2014-05-23 17:44:18 +0200 | [diff] [blame] | 153 | #endif |