glibc/sysdeps/sh/memset.S
Ulrich Drepper 8439150e8a Update.
2002-07-05  Kaz Kojima  <kkojima@rr.iij4u.or.jp>

	* sysdeps/sh/memcpy.S: Optimize.  Based on a patch by Toshiyasu
	Morita <toshiyasu.morita@hsa.hitachi.com>.
	* sysdeps/sh/memcpy.S: Likewise.
2003-01-03 09:57:28 +00:00

88 lines
1.7 KiB
ArmAsm

/* Copyright (C) 1999, 2000, 2002 Free Software Foundation, Inc.
This file is part of the GNU C Library.
Contributed by Kazumoto Kojima <kkojima@rr.iij4u.or.jp>
Optimized by Toshiyasu Morita <toshiyasu.morita@hsa.hitachi.com>
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, write to the Free
Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
02111-1307 USA. */
#include <sysdep.h>
/* void *memset (t, c, len); */
ENTRY(memset)
mov #12,r0
cmp/gt r6,r0
bt.s L_byte_loop_init
mov r4,r7
swap.b r5,r1
or r1,r5
swap.w r5,r1
or r1,r5
mov r4,r0
tst #1,r0
bt L_wordalign
mov.b r5,@r4
add #-1,r6
add #1,r4
mov r4,r0
.balignw 4,0x0009
L_wordalign:
tst #2,r0
bt L_word_loop_init
mov.w r5,@r4
add #-2,r6
add #2,r4
mov r4,r0
.balignw 4,0x0009
L_word_loop_init:
mov r6,r3
shlr2 r3
mov #7,r0
shlr r3
and r0,r6
.balignw 4,0x0009
L_2word_loop:
mov.l r5,@r4
dt r3
mov.l r5,@(4,r4)
bf.s L_2word_loop
add #8,r4
.balignw 4,0x0009
L_byte_loop_init:
tst r6,r6
bt L_byte_exit
.balignw 4,0x0009
L_byte_loop:
mov.b r5,@r4
dt r6
bf.s L_byte_loop
add #1,r4
.balignw 4,0x0009
L_byte_exit:
rts
mov r7,r0
END(memset)