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/* The assembly function for string copy. C-SKY ABIV2 version.
Copyright (C) 2018-2019 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
<http://www.gnu.org/licenses/>. */
#include <sysdep.h>
ENTRY (strcpy)
mov a3, a0
/* Check if the src addr is aligned. */
andi t0, a1, 3
bnez t0, 11f
1:
/* Check if all the bytes in the word are not zero. */
ldw a2, (a1)
tstnbz a2
bf 9f
stw a2, (a3)
ldw a2, (a1, 4)
tstnbz a2
bf 2f
stw a2, (a3, 4)
ldw a2, (a1, 8)
tstnbz a2
bf 3f
stw a2, (a3, 8)
ldw a2, (a1, 12)
tstnbz a2
bf 4f
stw a2, (a3, 12)
ldw a2, (a1, 16)
tstnbz a2
bf 5f
stw a2, (a3, 16)
ldw a2, (a1, 20)
tstnbz a2
bf 6f
stw a2, (a3, 20)
ldw a2, (a1, 24)
tstnbz a2
bf 7f
stw a2, (a3, 24)
ldw a2, (a1, 28)
tstnbz a2
bf 8f
stw a2, (a3, 28)
addi a3, 32
addi a1, 32
br 1b
2:
addi a3, 4
br 9f
3:
addi a3, 8
br 9f
4:
addi a3, 12
br 9f
5:
addi a3, 16
br 9f
6:
addi a3, 20
br 9f
7:
addi a3, 24
br 9f
8:
addi a3, 28
9:
xtrb3 t0, a2
st.b t0, (a3)
bez t0, 10f
xtrb2 t0, a2
st.b t0, (a3, 1)
bez t0, 10f
xtrb1 t0, a2
st.b t0, (a3, 2)
bez t0, 10f
stw a2, (a3)
10:
jmp lr
11:
subi t0, 4
12:
ld.b a2, (a1)
st.b a2, (a3)
bez a2, 10b
addi t0, 1
addi a1, a1, 1
addi a3, a3, 1
bnez t0, 12b
br 1b
END (strcpy)
libc_hidden_def (strcpy)
.weak strcpy
|
