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/* Optimized memset aligned implementation using basic LoongArch instructions.
Copyright (C) 2023-2024 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>
#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)
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