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/* Optimized strcpy 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)
# ifndef STRCPY
# define STRCPY __strcpy_unaligned
# endif
# ifdef USE_AS_STPCPY
# define dstend a0
# else
# define dstend a4
# endif
LEAF(STRCPY, 6)
lu12i.w t5, 0x01010
li.w t0, 0xff8
ori t5, t5, 0x101
andi t1, a1, 0xfff
bstrins.d t5, t5, 63, 32
move a2, a0
slli.d t6, t5, 7
bltu t0, t1, L(page_cross)
L(start_entry):
ld.d t0, a1, 0
li.d t3, 8
andi a3, a1, 0x7
sub.d t1, t0, t5
andn t2, t6, t0
sub.d t3, t3, a3
and t1, t1, t2
bnez t1, L(end)
add.d a1, a1, t3
st.d t0, a2, 0
add.d a2, a2, t3
ld.d t0, a1, 0
sub.d t1, t0, t5
andn t2, t6, t0
and t1, t1, t2
bnez t1, L(long_end)
L(loop):
st.d t0, a2, 0
ld.d t0, a1, 8
addi.d a2, a2, 8
addi.d a1, a1, 8
sub.d t1, t0, t5
andn t2, t6, t0
and t1, t1, t2
beqz t1, L(loop)
L(long_end):
ctz.d t1, t1
srli.d t1, t1, 3
add.d a1, a1, t1
ld.d t0, a1, -7
add.d dstend, a2, t1
st.d t0, dstend, -7
jr ra
nop
L(end):
ctz.d t1, t1
srli.d t1, t1, 3
add.d a3, a1, t1
add.d dstend, a2, t1
L(less_8):
li.d t0, 3
bltu t1, t0, L(less_3)
ld.w t1, a1, 0
ld.w t2, a3, -3
st.w t1, a2, 0
st.w t2, dstend, -3
jr ra
L(less_3):
beqz t1, L(zero_bytes)
ld.h t1, a1, 0
st.h t1, a2, 0
L(zero_bytes):
st.b zero, dstend, 0
jr ra
L(page_cross):
move a4, a1
bstrins.d a4, zero, 2, 0
ld.d t0, a4, 0
li.d t3, -1
slli.d t4, a1, 3
srl.d t3, t3, t4
srl.d t0, t0, t4
orn t0, t0, t3
sub.d t1, t0, t5
andn t2, t6, t0
and t1, t1, t2
beqz t1, L(start_entry)
b L(end)
END(STRCPY)
libc_hidden_builtin_def (STRCPY)
#endif
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