| 1 | /* Memset for falkor. |
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| 2 | Copyright (C) 2017-2022 Free Software Foundation, Inc. |
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| 3 | |
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| 4 | This file is part of the GNU C Library. |
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| 5 | |
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| 6 | The GNU C Library is free software; you can redistribute it and/or |
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| 7 | modify it under the terms of the GNU Lesser General Public |
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| 8 | License as published by the Free Software Foundation; either |
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| 9 | version 2.1 of the License, or (at your option) any later version. |
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| 10 | |
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| 11 | The GNU C Library is distributed in the hope that it will be useful, |
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| 12 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
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| 13 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
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| 14 | Lesser General Public License for more details. |
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| 15 | |
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| 16 | You should have received a copy of the GNU Lesser General Public |
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| 17 | License along with the GNU C Library. If not, see |
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| 18 | <https://www.gnu.org/licenses/>. */ |
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| 19 | |
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| 20 | #include <sysdep.h> |
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| 21 | #include <memset-reg.h> |
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| 22 | |
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| 23 | /* Reading dczid_el0 is expensive on falkor so move it into the ifunc |
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| 24 | resolver and assume ZVA size of 64 bytes. The IFUNC resolver takes care to |
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| 25 | use this function only when ZVA is enabled. */ |
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| 26 | |
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| 27 | #if IS_IN (libc) |
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| 28 | .macro zva_macro |
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| 29 | .p2align 4 |
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| 30 | /* Write the first and last 64 byte aligned block using stp rather |
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| 31 | than using DC ZVA. This is faster on some cores. */ |
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| 32 | str q0, [dst, 16] |
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| 33 | stp q0, q0, [dst, 32] |
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| 34 | bic dst, dst, 63 |
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| 35 | stp q0, q0, [dst, 64] |
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| 36 | stp q0, q0, [dst, 96] |
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| 37 | sub count, dstend, dst /* Count is now 128 too large. */ |
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| 38 | sub count, count, 128+64+64 /* Adjust count and bias for loop. */ |
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| 39 | add dst, dst, 128 |
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| 40 | 1: dc zva, dst |
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| 41 | add dst, dst, 64 |
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| 42 | subs count, count, 64 |
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| 43 | b.hi 1b |
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| 44 | stp q0, q0, [dst, 0] |
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| 45 | stp q0, q0, [dst, 32] |
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| 46 | stp q0, q0, [dstend, -64] |
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| 47 | stp q0, q0, [dstend, -32] |
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| 48 | ret |
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| 49 | .endm |
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| 50 | |
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| 51 | # define ZVA_MACRO zva_macro |
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| 52 | # define MEMSET __memset_falkor |
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| 53 | # include <sysdeps/aarch64/memset.S> |
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| 54 | #endif |
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| 55 | |
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