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/* Optimized memset unaligned implementation using basic LoongArch instructions.
Copyright (C) 2023 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_unaligned
#define ST_128(n) \
st.d a1, a0, n; \
st.d a1, a0, n+8 ; \
st.d a1, a0, n+16 ; \
st.d a1, a0, n+24 ; \
st.d a1, a0, n+32 ; \
st.d a1, a0, n+40 ; \
st.d a1, a0, n+48 ; \
st.d a1, a0, n+56 ; \
st.d a1, a0, n+64 ; \
st.d a1, a0, n+72 ; \
st.d a1, a0, n+80 ; \
st.d a1, a0, n+88 ; \
st.d a1, a0, n+96 ; \
st.d a1, a0, n+104; \
st.d a1, a0, n+112; \
st.d a1, a0, n+120;
LEAF(MEMSET_NAME, 6)
bstrins.d a1, a1, 15, 8
add.d t7, a0, a2
bstrins.d a1, a1, 31, 16
move t0, a0
bstrins.d a1, a1, 63, 32
srai.d t8, a2, 4
beqz t8, L(less_16bytes)
srai.d t8, a2, 6
bnez t8, L(more_64bytes)
srai.d t8, a2, 5
beqz t8, L(less_32bytes)
st.d a1, a0, 0
st.d a1, a0, 8
st.d a1, a0, 16
st.d a1, a0, 24
st.d a1, t7, -32
st.d a1, t7, -24
st.d a1, t7, -16
st.d a1, t7, -8
jr ra
L(less_32bytes):
st.d a1, a0, 0
st.d a1, a0, 8
st.d a1, t7, -16
st.d a1, t7, -8
jr ra
L(less_16bytes):
srai.d t8, a2, 3
beqz t8, L(less_8bytes)
st.d a1, a0, 0
st.d a1, t7, -8
jr ra
L(less_8bytes):
srai.d t8, a2, 2
beqz t8, L(less_4bytes)
st.w a1, a0, 0
st.w a1, t7, -4
jr ra
L(less_4bytes):
srai.d t8, a2, 1
beqz t8, L(less_2bytes)
st.h a1, a0, 0
st.h a1, t7, -2
jr ra
L(less_2bytes):
beqz a2, L(less_1bytes)
st.b a1, a0, 0
jr ra
L(less_1bytes):
jr ra
L(more_64bytes):
srli.d a0, a0, 3
slli.d a0, a0, 3
addi.d a0, a0, 0x8
st.d a1, t0, 0
sub.d t2, t0, a0
add.d a2, t2, a2
addi.d a2, a2, -0x80
blt a2, zero, L(end_unalign_proc)
L(loop_less):
ST_128(0)
addi.d a0, a0, 0x80
addi.d a2, a2, -0x80
bge a2, zero, L(loop_less)
L(end_unalign_proc):
addi.d a2, a2, 0x80
pcaddi t1, 20
andi t5, a2, 0x78
srli.d t5, t5, 1
sub.d t1, t1, t5
jr t1
st.d a1, a0, 112
st.d a1, a0, 104
st.d a1, a0, 96
st.d a1, a0, 88
st.d a1, a0, 80
st.d a1, a0, 72
st.d a1, a0, 64
st.d a1, a0, 56
st.d a1, a0, 48
st.d a1, a0, 40
st.d a1, a0, 32
st.d a1, a0, 24
st.d a1, a0, 16
st.d a1, a0, 8
st.d a1, a0, 0
st.d a1, t7, -8
move a0, t0
jr ra
END(MEMSET_NAME)
libc_hidden_builtin_def (MEMSET_NAME)
#endif
|
