mirror of
https://sourceware.org/git/glibc.git
synced 2024-12-11 13:50:06 +00:00
04277e02d7
* All files with FSF copyright notices: Update copyright dates using scripts/update-copyrights. * locale/programs/charmap-kw.h: Regenerated. * locale/programs/locfile-kw.h: Likewise.
108 lines
2.9 KiB
ArmAsm
108 lines
2.9 KiB
ArmAsm
/* Optimized strcpy implementation for PowerPC476.
|
|
Copyright (C) 2010-2019 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>
|
|
|
|
/* strcpy
|
|
|
|
Register Use
|
|
r3:destination and return address
|
|
r4:source address
|
|
r10:temp destination address
|
|
|
|
Implementation description
|
|
Loop by checking 2 words at a time, with dlmzb. Check if there is a null
|
|
in the 2 words. If there is a null jump to end checking to determine
|
|
where in the last 8 bytes it is. Copy the appropriate bytes of the last
|
|
8 according to the null position. */
|
|
|
|
EALIGN (strcpy, 5, 0)
|
|
neg r7,r4
|
|
subi r4,r4,1
|
|
clrlwi. r8,r7,29
|
|
subi r10,r3,1
|
|
beq L(pre_word8_loop)
|
|
mtctr r8
|
|
|
|
L(loop):
|
|
lbzu r5,0x01(r4)
|
|
cmpi cr5,r5,0x0
|
|
stbu r5,0x01(r10)
|
|
beq cr5,L(end_strcpy)
|
|
bdnz L(loop)
|
|
|
|
L(pre_word8_loop):
|
|
subi r4,r4,3
|
|
subi r10,r10,3
|
|
|
|
L(word8_loop):
|
|
lwzu r5,0x04(r4)
|
|
lwzu r6,0x04(r4)
|
|
dlmzb. r11,r5,r6
|
|
bne L(byte_copy)
|
|
stwu r5,0x04(r10)
|
|
stwu r6,0x04(r10)
|
|
lwzu r5,0x04(r4)
|
|
lwzu r6,0x04(r4)
|
|
dlmzb. r11,r5,r6
|
|
bne L(byte_copy)
|
|
stwu r5,0x04(r10)
|
|
stwu r6,0x04(r10)
|
|
lwzu r5,0x04(r4)
|
|
lwzu r6,0x04(r4)
|
|
dlmzb. r11,r5,r6
|
|
bne L(byte_copy)
|
|
stwu r5,0x04(r10)
|
|
stwu r6,0x04(r10)
|
|
lwzu r5,0x04(r4)
|
|
lwzu r6,0x04(r4)
|
|
dlmzb. r11,r5,r6
|
|
bne L(byte_copy)
|
|
stwu r5,0x04(r10)
|
|
stwu r6,0x04(r10)
|
|
b L(word8_loop)
|
|
|
|
L(last_bytes_copy):
|
|
stwu r5,0x04(r10)
|
|
subi r11,r11,4
|
|
mtctr r11
|
|
addi r10,r10,3
|
|
subi r4,r4,1
|
|
|
|
L(last_bytes_copy_loop):
|
|
lbzu r5,0x01(r4)
|
|
stbu r5,0x01(r10)
|
|
bdnz L(last_bytes_copy_loop)
|
|
blr
|
|
|
|
L(byte_copy):
|
|
blt L(last_bytes_copy)
|
|
mtctr r11
|
|
addi r10,r10,3
|
|
subi r4,r4,5
|
|
|
|
L(last_bytes_copy_loop2):
|
|
lbzu r5,0x01(r4)
|
|
stbu r5,0x01(r10)
|
|
bdnz L(last_bytes_copy_loop2)
|
|
|
|
L(end_strcpy):
|
|
blr
|
|
END (strcpy)
|
|
libc_hidden_builtin_def (strcpy)
|