| /* Memset for falkor. |
| Copyright (C) 2017-2018 Free Software Foundation, Inc. |
| |
| This file is part of the GNU C Library. |
| |
| The GNU C Library is free software; you can redistribute it and/or |
| modify it under the terms of the GNU Lesser General Public |
| License as published by the Free Software Foundation; either |
| version 2.1 of the License, or (at your option) any later version. |
| |
| The GNU C Library is distributed in the hope that it will be useful, |
| but WITHOUT ANY WARRANTY; without even the implied warranty of |
| MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
| Lesser General Public License for more details. |
| |
| You should have received a copy of the GNU Lesser General Public |
| License along with the GNU C Library. If not, see |
| <http://www.gnu.org/licenses/>. */ |
| |
| #include <memset-reg.h> |
| |
| /* Reading dczid_el0 is expensive on falkor so move it into the ifunc |
| resolver and assume ZVA size of 64 bytes. The IFUNC resolver takes care to |
| use this function only when ZVA is enabled. */ |
| |
| #if IS_IN (libc) |
| .macro zva_macro |
| .p2align 4 |
| /* Write the first and last 64 byte aligned block using stp rather |
| than using DC ZVA. This is faster on some cores. */ |
| str q0, [dst, 16] |
| stp q0, q0, [dst, 32] |
| bic dst, dst, 63 |
| stp q0, q0, [dst, 64] |
| stp q0, q0, [dst, 96] |
| sub count, dstend, dst /* Count is now 128 too large. */ |
| sub count, count, 128+64+64 /* Adjust count and bias for loop. */ |
| add dst, dst, 128 |
| 1: dc zva, dst |
| add dst, dst, 64 |
| subs count, count, 64 |
| b.hi 1b |
| stp q0, q0, [dst, 0] |
| stp q0, q0, [dst, 32] |
| stp q0, q0, [dstend, -64] |
| stp q0, q0, [dstend, -32] |
| ret |
| .endm |
| |
| # define ZVA_MACRO zva_macro |
| # define MEMSET __memset_falkor |
| # include <sysdeps/aarch64/memset.S> |
| #endif |
