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/* Optimized memset for Huawei Kunpeng processor.
Copyright (C) 2012-2024 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
<https://www.gnu.org/licenses/>. */
#include <sysdep.h>
/* Assumptions:
*
* ARMv8-a, AArch64, unaligned accesses
*
*/
#define dstin x0
#define valw w1
#define count x2
#define dst x3
#define dstend x4
ENTRY (__memset_kunpeng)
PTR_ARG (0)
SIZE_ARG (2)
dup v0.16B, valw
add dstend, dstin, count
cmp count, 128
b.hs L(set_long)
cmp count, 16
b.lo L(less16)
/* Set 16..127 bytes. */
str q0, [dstin]
tbnz count, 6, L(set127)
str q0, [dstend, -16]
tbz count, 5, 1f
str q0, [dstin, 16]
str q0, [dstend, -32]
1: ret
.p2align 4
/* Set 64..127 bytes. Write 64 bytes from the start and
64 bytes from the end. */
L(set127):
stp q0, q0, [dstin, 16]
str q0, [dstin, 48]
stp q0, q0, [dstend, -64]
stp q0, q0, [dstend, -32]
ret
.p2align 4
/* Set 0..15 bytes. */
L(less16):
tbz count, 3, L(less8)
str d0, [dstin]
str d0, [dstend, -8]
ret
L(less8):
tbz count, 2, 2f
str s0, [dstin]
str s0, [dstend, -4]
ret
2: cbz count, 3f
str b0, [dstin]
tbz count, 1, 3f
str h0, [dstend, -2]
3: ret
.p2align 4
L(set_long):
bic dst, dstin, 15
str q0, [dstin]
sub count, dstend, dst /* Count is 16 too large. */
sub dst, dst, 16 /* Dst is biased by -32. */
sub count, count, 64 + 16 + 1 /* Adjust count and bias for loop. */
1: stp q0, q0, [dst, 32]
stp q0, q0, [dst, 64]!
subs count, count, 64
b.lo 1f
stp q0, q0, [dst, 32]
stp q0, q0, [dst, 64]!
subs count, count, 64
b.lo 1f
stp q0, q0, [dst, 32]
stp q0, q0, [dst, 64]!
subs count, count, 64
b.lo 1f
stp q0, q0, [dst, 32]
stp q0, q0, [dst, 64]!
subs count, count, 64
b.hs 1b
1: stp q0, q0, [dstend, -64]
stp q0, q0, [dstend, -32]
ret
END (__memset_kunpeng)
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