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/* Optimized strcpy stpcpy aligned 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_aligned
# endif
#else
# ifndef STRCPY
# define STRCPY strcpy
# endif
#endif
LEAF(STRCPY, 6)
andi a3, a0, 0x7
move a2, a0
beqz a3, L(dest_align)
sub.d a5, a1, a3
addi.d a5, a5, 8
L(make_dest_align):
ld.b t0, a1, 0
addi.d a1, a1, 1
st.b t0, a2, 0
addi.d a2, a2, 1
beqz t0, L(al_out)
bne a1, a5, L(make_dest_align)
L(dest_align):
andi a4, a1, 7
bstrins.d a1, zero, 2, 0
lu12i.w t5, 0x1010
ld.d t0, a1, 0
ori t5, t5, 0x101
bstrins.d t5, t5, 63, 32
slli.d t6, t5, 0x7
bnez a4, L(unalign)
sub.d t1, t0, t5
andn t2, t6, t0
and t3, t1, t2
bnez t3, L(al_end)
L(al_loop):
st.d t0, a2, 0
ld.d t0, a1, 8
addi.d a1, a1, 8
addi.d a2, a2, 8
sub.d t1, t0, t5
andn t2, t6, t0
and t3, t1, t2
beqz t3, L(al_loop)
L(al_end):
ctz.d t1, t3
srli.d t1, t1, 3
addi.d t1, t1, 1
andi a3, t1, 8
andi a4, t1, 4
andi a5, t1, 2
andi a6, t1, 1
L(al_end_8):
beqz a3, L(al_end_4)
st.d t0, a2, 0
#ifdef USE_AS_STPCPY
addi.d a0, a2, 7
#endif
jr ra
L(al_end_4):
beqz a4, L(al_end_2)
st.w t0, a2, 0
addi.d a2, a2, 4
srli.d t0, t0, 32
L(al_end_2):
beqz a5, L(al_end_1)
st.h t0, a2, 0
addi.d a2, a2, 2
srli.d t0, t0, 16
L(al_end_1):
beqz a6, L(al_out)
st.b t0, a2, 0
addi.d a2, a2, 1
L(al_out):
#ifdef USE_AS_STPCPY
addi.d a0, a2, -1
#endif
jr ra
.align 4
L(unalign):
slli.d a5, a4, 3
li.d t1, -1
sub.d a6, zero, a5
srl.d a7, t0, a5
sll.d t7, t1, a6
or t0, a7, t7
sub.d t1, t0, t5
andn t2, t6, t0
and t3, t1, t2
bnez t3, L(un_end)
ld.d t4, a1, 8
sub.d t1, t4, t5
andn t2, t6, t4
sll.d t0, t4, a6
and t3, t1, t2
or t0, t0, a7
bnez t3, L(un_end_with_remaining)
L(un_loop):
srl.d a7, t4, a5
ld.d t4, a1, 16
addi.d a1, a1, 8
st.d t0, a2, 0
addi.d a2, a2, 8
sub.d t1, t4, t5
andn t2, t6, t4
sll.d t0, t4, a6
and t3, t1, t2
or t0, t0, a7
beqz t3, L(un_loop)
L(un_end_with_remaining):
ctz.d t1, t3
srli.d t1, t1, 3
addi.d t1, t1, 1
sub.d t1, t1, a4
blt t1, zero, L(un_end_less_8)
st.d t0, a2, 0
addi.d a2, a2, 8
beqz t1, L(un_out)
srl.d t0, t4, a5
b L(un_end_less_8)
L(un_end):
ctz.d t1, t3
srli.d t1, t1, 3
addi.d t1, t1, 1
L(un_end_less_8):
andi a4, t1, 4
andi a5, t1, 2
andi a6, t1, 1
L(un_end_4):
beqz a4, L(un_end_2)
st.w t0, a2, 0
addi.d a2, a2, 4
srli.d t0, t0, 32
L(un_end_2):
beqz a5, L(un_end_1)
st.h t0, a2, 0
addi.d a2, a2, 2
srli.d t0, t0, 16
L(un_end_1):
beqz a6, L(un_out)
st.b t0, a2, 0
addi.d a2, a2, 1
L(un_out):
#ifdef USE_AS_STPCPY
addi.d a0, a2, -1
#endif
jr ra
END(STRCPY)
libc_hidden_builtin_def (STRCPY)
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