mirror of
https://sourceware.org/git/glibc.git
synced 2025-08-08 17:42:12 +03:00
175 lines
4.0 KiB
ArmAsm
175 lines
4.0 KiB
ArmAsm
/* Optimized memset aligned implementation using basic LoongArch instructions.
|
|
Copyright (C) 2023-2025 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>
|
|
#include <sys/regdef.h>
|
|
#include <sys/asm.h>
|
|
|
|
#if IS_IN (libc)
|
|
# define MEMSET_NAME __memset_aligned
|
|
#else
|
|
# define MEMSET_NAME memset
|
|
#endif
|
|
|
|
LEAF(MEMSET_NAME, 6)
|
|
move t0, a0
|
|
andi a3, a0, 0x7
|
|
li.w t6, 16
|
|
beqz a3, L(align)
|
|
bltu a2, t6, L(short_data)
|
|
|
|
L(make_align):
|
|
li.w t8, 8
|
|
sub.d t2, t8, a3
|
|
pcaddi t1, 11
|
|
slli.d t3, t2, 2
|
|
sub.d t1, t1, t3
|
|
jr t1
|
|
|
|
L(al7):
|
|
st.b a1, t0, 6
|
|
L(al6):
|
|
st.b a1, t0, 5
|
|
L(al5):
|
|
st.b a1, t0, 4
|
|
L(al4):
|
|
st.b a1, t0, 3
|
|
L(al3):
|
|
st.b a1, t0, 2
|
|
L(al2):
|
|
st.b a1, t0, 1
|
|
L(al1):
|
|
st.b a1, t0, 0
|
|
L(al0):
|
|
add.d t0, t0, t2
|
|
sub.d a2, a2, t2
|
|
|
|
L(align):
|
|
bstrins.d a1, a1, 15, 8
|
|
bstrins.d a1, a1, 31, 16
|
|
bstrins.d a1, a1, 63, 32
|
|
bltu a2, t6, L(less_16bytes)
|
|
|
|
andi a4, a2, 0x3f
|
|
beq a4, a2, L(less_64bytes)
|
|
|
|
sub.d t1, a2, a4
|
|
move a2, a4
|
|
add.d a5, t0, t1
|
|
|
|
L(loop_64bytes):
|
|
addi.d t0, t0, 64
|
|
st.d a1, t0, -64
|
|
st.d a1, t0, -56
|
|
st.d a1, t0, -48
|
|
st.d a1, t0, -40
|
|
|
|
st.d a1, t0, -32
|
|
st.d a1, t0, -24
|
|
st.d a1, t0, -16
|
|
st.d a1, t0, -8
|
|
bne t0, a5, L(loop_64bytes)
|
|
|
|
L(less_64bytes):
|
|
srai.d a4, a2, 5
|
|
beqz a4, L(less_32bytes)
|
|
addi.d a2, a2, -32
|
|
st.d a1, t0, 0
|
|
|
|
st.d a1, t0, 8
|
|
st.d a1, t0, 16
|
|
st.d a1, t0, 24
|
|
addi.d t0, t0, 32
|
|
|
|
L(less_32bytes):
|
|
bltu a2, t6, L(less_16bytes)
|
|
addi.d a2, a2, -16
|
|
st.d a1, t0, 0
|
|
st.d a1, t0, 8
|
|
addi.d t0, t0, 16
|
|
|
|
L(less_16bytes):
|
|
srai.d a4, a2, 3
|
|
beqz a4, L(less_8bytes)
|
|
addi.d a2, a2, -8
|
|
st.d a1, t0, 0
|
|
addi.d t0, t0, 8
|
|
|
|
L(less_8bytes):
|
|
beqz a2, L(less_1byte)
|
|
srai.d a4, a2, 2
|
|
beqz a4, L(less_4bytes)
|
|
addi.d a2, a2, -4
|
|
st.w a1, t0, 0
|
|
addi.d t0, t0, 4
|
|
|
|
L(less_4bytes):
|
|
srai.d a3, a2, 1
|
|
beqz a3, L(less_2bytes)
|
|
addi.d a2, a2, -2
|
|
st.h a1, t0, 0
|
|
addi.d t0, t0, 2
|
|
|
|
L(less_2bytes):
|
|
beqz a2, L(less_1byte)
|
|
st.b a1, t0, 0
|
|
L(less_1byte):
|
|
jr ra
|
|
|
|
L(short_data):
|
|
pcaddi t1, 19
|
|
slli.d t3, a2, 2
|
|
sub.d t1, t1, t3
|
|
jr t1
|
|
L(short_15):
|
|
st.b a1, a0, 14
|
|
L(short_14):
|
|
st.b a1, a0, 13
|
|
L(short_13):
|
|
st.b a1, a0, 12
|
|
L(short_12):
|
|
st.b a1, a0, 11
|
|
L(short_11):
|
|
st.b a1, a0, 10
|
|
L(short_10):
|
|
st.b a1, a0, 9
|
|
L(short_9):
|
|
st.b a1, a0, 8
|
|
L(short_8):
|
|
st.b a1, a0, 7
|
|
L(short_7):
|
|
st.b a1, a0, 6
|
|
L(short_6):
|
|
st.b a1, a0, 5
|
|
L(short_5):
|
|
st.b a1, a0, 4
|
|
L(short_4):
|
|
st.b a1, a0, 3
|
|
L(short_3):
|
|
st.b a1, a0, 2
|
|
L(short_2):
|
|
st.b a1, a0, 1
|
|
L(short_1):
|
|
st.b a1, a0, 0
|
|
L(short_0):
|
|
jr ra
|
|
END(MEMSET_NAME)
|
|
|
|
libc_hidden_builtin_def (MEMSET_NAME)
|