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Diffstat (limited to 'sysdeps/aarch64/memset.S')
| -rw-r--r-- | sysdeps/aarch64/memset.S | 195 |
1 files changed, 0 insertions, 195 deletions
diff --git a/sysdeps/aarch64/memset.S b/sysdeps/aarch64/memset.S deleted file mode 100644 index 110fd22781..0000000000 --- a/sysdeps/aarch64/memset.S +++ /dev/null @@ -1,195 +0,0 @@ -/* Copyright (C) 2012-2017 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 <sysdep.h> - -/* Assumptions: - * - * ARMv8-a, AArch64, unaligned accesses - * - */ - -#define dstin x0 -#define val x1 -#define valw w1 -#define count x2 -#define dst x3 -#define dstend x4 -#define tmp1 x5 -#define tmp1w w5 -#define tmp2 x6 -#define tmp2w w6 -#define zva_len x7 -#define zva_lenw w7 - -ENTRY_ALIGN (__memset, 6) - - DELOUSE (0) - DELOUSE (2) - - dup v0.16B, valw - add dstend, dstin, count - - cmp count, 96 - b.hi L(set_long) - cmp count, 16 - b.hs L(set_medium) - mov val, v0.D[0] - - /* Set 0..15 bytes. */ - tbz count, 3, 1f - str val, [dstin] - str val, [dstend, -8] - ret - nop -1: tbz count, 2, 2f - str valw, [dstin] - str valw, [dstend, -4] - ret -2: cbz count, 3f - strb valw, [dstin] - tbz count, 1, 3f - strh valw, [dstend, -2] -3: ret - - /* Set 17..96 bytes. */ -L(set_medium): - str q0, [dstin] - tbnz count, 6, L(set96) - str q0, [dstend, -16] - tbz count, 5, 1f - str q0, [dstin, 16] - str q0, [dstend, -32] -1: ret - - .p2align 4 - /* Set 64..96 bytes. Write 64 bytes from the start and - 32 bytes from the end. */ -L(set96): - str q0, [dstin, 16] - stp q0, q0, [dstin, 32] - stp q0, q0, [dstend, -32] - ret - - .p2align 3 - nop -L(set_long): - and valw, valw, 255 - bic dst, dstin, 15 - str q0, [dstin] - cmp count, 256 - ccmp valw, 0, 0, cs - b.eq L(try_zva) -L(no_zva): - sub count, dstend, dst /* Count is 16 too large. */ - add dst, dst, 16 - sub count, count, 64 + 16 /* Adjust count and bias for loop. */ -1: stp q0, q0, [dst], 64 - stp q0, q0, [dst, -32] -L(tail64): - subs count, count, 64 - b.hi 1b -2: stp q0, q0, [dstend, -64] - stp q0, q0, [dstend, -32] - ret - - .p2align 3 -L(try_zva): - mrs tmp1, dczid_el0 - tbnz tmp1w, 4, L(no_zva) - and tmp1w, tmp1w, 15 - cmp tmp1w, 4 /* ZVA size is 64 bytes. */ - b.ne L(zva_128) - - /* Write the first and last 64 byte aligned block using stp rather - than using DC ZVA. This is faster on some cores. - */ -L(zva_64): - 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 - nop -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 - - .p2align 3 -L(zva_128): - cmp tmp1w, 5 /* ZVA size is 128 bytes. */ - b.ne L(zva_other) - - str q0, [dst, 16] - stp q0, q0, [dst, 32] - stp q0, q0, [dst, 64] - stp q0, q0, [dst, 96] - bic dst, dst, 127 - sub count, dstend, dst /* Count is now 128 too large. */ - sub count, count, 128+128 /* Adjust count and bias for loop. */ - add dst, dst, 128 -1: dc zva, dst - add dst, dst, 128 - subs count, count, 128 - b.hi 1b - stp q0, q0, [dstend, -128] - stp q0, q0, [dstend, -96] - stp q0, q0, [dstend, -64] - stp q0, q0, [dstend, -32] - ret - -L(zva_other): - mov tmp2w, 4 - lsl zva_lenw, tmp2w, tmp1w - add tmp1, zva_len, 64 /* Max alignment bytes written. */ - cmp count, tmp1 - blo L(no_zva) - - sub tmp2, zva_len, 1 - add tmp1, dst, zva_len - add dst, dst, 16 - subs count, tmp1, dst /* Actual alignment bytes to write. */ - bic tmp1, tmp1, tmp2 /* Aligned dc zva start address. */ - beq 2f -1: stp q0, q0, [dst], 64 - stp q0, q0, [dst, -32] - subs count, count, 64 - b.hi 1b -2: mov dst, tmp1 - sub count, dstend, tmp1 /* Remaining bytes to write. */ - subs count, count, zva_len - b.lo 4f -3: dc zva, dst - add dst, dst, zva_len - subs count, count, zva_len - b.hs 3b -4: add count, count, zva_len - b L(tail64) - -END (__memset) -weak_alias (__memset, memset) -libc_hidden_builtin_def (memset) |