projects / thirdparty / glibc.git / blame
| Commit | Line | Data |
|---|---|---|
| 04277e02 | 1 | /* Copyright (C) 2012-2019 Free Software Foundation, Inc. |
| 58faa087 MS |
2 | |
| 3 | This file is part of the GNU C Library. | |
| 4 | ||
| 5 | The GNU C Library is free software; you can redistribute it and/or | |
| 6 | modify it under the terms of the GNU Lesser General Public | |
| 7 | License as published by the Free Software Foundation; either | |
| 8 | version 2.1 of the License, or (at your option) any later version. | |
| 9 | ||
| 10 | The GNU C Library is distributed in the hope that it will be useful, | |
| 11 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
| 12 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
| 13 | Lesser General Public License for more details. | |
| 14 | ||
| 15 | You should have received a copy of the GNU Lesser General Public | |
| 16 | License along with the GNU C Library. If not, see | |
| 17 | <http://www.gnu.org/licenses/>. */ | |
| 18 | ||
| a8c5a2a9 | 19 | #include <sysdep.h> |
| 5a67c4fa | 20 | #include "memset-reg.h" |
| a8c5a2a9 | 21 | |
| 4e001969 AZ |
22 | #ifndef MEMSET |
| 23 | # define MEMSET memset | |
| 24 | #endif | |
| 25 | ||
| 58faa087 MS |
26 | /* Assumptions: |
| 27 | * | |
| a8c5a2a9 | 28 | * ARMv8-a, AArch64, unaligned accesses |
| 58faa087 MS |
29 | * |
| 30 | */ | |
| 31 | ||
| 5a67c4fa | 32 | ENTRY_ALIGN (MEMSET, 6) |
| 58faa087 | 33 | |
| 389d1f1b SE |
34 | DELOUSE (0) |
| 35 | DELOUSE (2) | |
| 36 | ||
| a8c5a2a9 WD |
37 | dup v0.16B, valw |
| 38 | add dstend, dstin, count | |
| 39 | ||
| 40 | cmp count, 96 | |
| 41 | b.hi L(set_long) | |
| 42 | cmp count, 16 | |
| 43 | b.hs L(set_medium) | |
| 44 | mov val, v0.D[0] | |
| 45 | ||
| 46 | /* Set 0..15 bytes. */ | |
| 47 | tbz count, 3, 1f | |
| 48 | str val, [dstin] | |
| 49 | str val, [dstend, -8] | |
| 50 | ret | |
| 51 | nop | |
| 52 | 1: tbz count, 2, 2f | |
| 53 | str valw, [dstin] | |
| 54 | str valw, [dstend, -4] | |
| 55 | ret | |
| 56 | 2: cbz count, 3f | |
| 57 | strb valw, [dstin] | |
| 58 | tbz count, 1, 3f | |
| 59 | strh valw, [dstend, -2] | |
| 60 | 3: ret | |
| 61 | ||
| 62 | /* Set 17..96 bytes. */ | |
| 63 | L(set_medium): | |
| 64 | str q0, [dstin] | |
| 65 | tbnz count, 6, L(set96) | |
| 66 | str q0, [dstend, -16] | |
| 67 | tbz count, 5, 1f | |
| 68 | str q0, [dstin, 16] | |
| 69 | str q0, [dstend, -32] | |
| 70 | 1: ret | |
| 71 | ||
| 72 | .p2align 4 | |
| 73 | /* Set 64..96 bytes. Write 64 bytes from the start and | |
| 74 | 32 bytes from the end. */ | |
| 75 | L(set96): | |
| 76 | str q0, [dstin, 16] | |
| 77 | stp q0, q0, [dstin, 32] | |
| 78 | stp q0, q0, [dstend, -32] | |
| 79 | ret | |
| 80 | ||
| 81 | .p2align 3 | |
| 82 | nop | |
| 83 | L(set_long): | |
| 84 | and valw, valw, 255 | |
| 85 | bic dst, dstin, 15 | |
| 86 | str q0, [dstin] | |
| 87 | cmp count, 256 | |
| 88 | ccmp valw, 0, 0, cs | |
| 89 | b.eq L(try_zva) | |
| 90 | L(no_zva): | |
| 91 | sub count, dstend, dst /* Count is 16 too large. */ | |
| 5770c0ad | 92 | sub dst, dst, 16 /* Dst is biased by -32. */ |
| a8c5a2a9 | 93 | sub count, count, 64 + 16 /* Adjust count and bias for loop. */ |
| 5770c0ad WD |
94 | 1: stp q0, q0, [dst, 32] |
| 95 | stp q0, q0, [dst, 64]! | |
| a8c5a2a9 WD |
96 | L(tail64): |
| 97 | subs count, count, 64 | |
| 98 | b.hi 1b | |
| 99 | 2: stp q0, q0, [dstend, -64] | |
| 100 | stp q0, q0, [dstend, -32] | |
| 101 | ret | |
| 102 | ||
| a8c5a2a9 | 103 | L(try_zva): |
| 5a67c4fa SP |
104 | #ifdef ZVA_MACRO |
| 105 | zva_macro | |
| 106 | #else | |
| 107 | .p2align 3 | |
| 58faa087 | 108 | mrs tmp1, dczid_el0 |
| a8c5a2a9 WD |
109 | tbnz tmp1w, 4, L(no_zva) |
| 110 | and tmp1w, tmp1w, 15 | |
| 111 | cmp tmp1w, 4 /* ZVA size is 64 bytes. */ | |
| 112 | b.ne L(zva_128) | |
| 113 | ||
| 114 | /* Write the first and last 64 byte aligned block using stp rather | |
| 115 | than using DC ZVA. This is faster on some cores. | |
| 116 | */ | |
| 117 | L(zva_64): | |
| 118 | str q0, [dst, 16] | |
| 119 | stp q0, q0, [dst, 32] | |
| 120 | bic dst, dst, 63 | |
| 121 | stp q0, q0, [dst, 64] | |
| 122 | stp q0, q0, [dst, 96] | |
| 123 | sub count, dstend, dst /* Count is now 128 too large. */ | |
| 124 | sub count, count, 128+64+64 /* Adjust count and bias for loop. */ | |
| 125 | add dst, dst, 128 | |
| 126 | nop | |
| 127 | 1: dc zva, dst | |
| 128 | add dst, dst, 64 | |
| 129 | subs count, count, 64 | |
| 130 | b.hi 1b | |
| 131 | stp q0, q0, [dst, 0] | |
| 132 | stp q0, q0, [dst, 32] | |
| 133 | stp q0, q0, [dstend, -64] | |
| 134 | stp q0, q0, [dstend, -32] | |
| 135 | ret | |
| 136 | ||
| 137 | .p2align 3 | |
| 138 | L(zva_128): | |
| 139 | cmp tmp1w, 5 /* ZVA size is 128 bytes. */ | |
| 140 | b.ne L(zva_other) | |
| 141 | ||
| 142 | str q0, [dst, 16] | |
| 143 | stp q0, q0, [dst, 32] | |
| 144 | stp q0, q0, [dst, 64] | |
| 145 | stp q0, q0, [dst, 96] | |
| 146 | bic dst, dst, 127 | |
| 147 | sub count, dstend, dst /* Count is now 128 too large. */ | |
| 148 | sub count, count, 128+128 /* Adjust count and bias for loop. */ | |
| 149 | add dst, dst, 128 | |
| 150 | 1: dc zva, dst | |
| 151 | add dst, dst, 128 | |
| 152 | subs count, count, 128 | |
| 153 | b.hi 1b | |
| 154 | stp q0, q0, [dstend, -128] | |
| 155 | stp q0, q0, [dstend, -96] | |
| 156 | stp q0, q0, [dstend, -64] | |
| 157 | stp q0, q0, [dstend, -32] | |
| 158 | ret | |
| 159 | ||
| 160 | L(zva_other): | |
| 161 | mov tmp2w, 4 | |
| 162 | lsl zva_lenw, tmp2w, tmp1w | |
| 163 | add tmp1, zva_len, 64 /* Max alignment bytes written. */ | |
| 164 | cmp count, tmp1 | |
| 165 | blo L(no_zva) | |
| 166 | ||
| 167 | sub tmp2, zva_len, 1 | |
| 168 | add tmp1, dst, zva_len | |
| 169 | add dst, dst, 16 | |
| 170 | subs count, tmp1, dst /* Actual alignment bytes to write. */ | |
| 171 | bic tmp1, tmp1, tmp2 /* Aligned dc zva start address. */ | |
| 172 | beq 2f | |
| 173 | 1: stp q0, q0, [dst], 64 | |
| 174 | stp q0, q0, [dst, -32] | |
| 175 | subs count, count, 64 | |
| 176 | b.hi 1b | |
| 177 | 2: mov dst, tmp1 | |
| 178 | sub count, dstend, tmp1 /* Remaining bytes to write. */ | |
| 179 | subs count, count, zva_len | |
| 180 | b.lo 4f | |
| 181 | 3: dc zva, dst | |
| 182 | add dst, dst, zva_len | |
| 183 | subs count, count, zva_len | |
| 184 | b.hs 3b | |
| 185 | 4: add count, count, zva_len | |
| 5770c0ad | 186 | sub dst, dst, 32 /* Bias dst for tail loop. */ |
| a8c5a2a9 | 187 | b L(tail64) |
| 5a67c4fa | 188 | #endif |
| 58faa087 | 189 | |
| 5a67c4fa SP |
190 | END (MEMSET) |
| 191 | libc_hidden_builtin_def (MEMSET) |