mirror of
https://sourceware.org/git/glibc.git
synced 2024-12-24 11:41:07 +00:00
8439150e8a
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.
200 lines
4.0 KiB
ArmAsm
200 lines
4.0 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>
|
|
#include <endian.h>
|
|
|
|
/* void *memcpy(void *dst, const void *src, size_t n);
|
|
No overlap between the memory of DST and of SRC are assumed. */
|
|
|
|
ENTRY(memcpy)
|
|
mov r4,r3 /* Save destination. */
|
|
|
|
/* If less than 11 bytes, just do a byte copy. */
|
|
mov #11,r0
|
|
cmp/gt r6,r0
|
|
bt L_byteloop_init
|
|
|
|
/* Check if we need to word-align source. */
|
|
mov r5,r0
|
|
tst #1,r0
|
|
bt L_wordalign
|
|
|
|
mov.b @r0+,r1 /* Copy one byte. */
|
|
add #-1,r6
|
|
mov.b r1,@r4
|
|
add #1,r4
|
|
|
|
.balignw 4,0x0009
|
|
L_wordalign:
|
|
/* Check if we need to longword-align source. */
|
|
tst #2,r0
|
|
bt L_copy
|
|
|
|
mov.w @r0+,r1 /* Copy one word. */
|
|
add #-2,r6
|
|
#if __BYTE_ORDER == __BIG_ENDIAN
|
|
add #1,r4
|
|
mov.b r1,@r4
|
|
shlr8 r1
|
|
mov.b r1,@-r4
|
|
add #2,r4
|
|
#else
|
|
mov.b r1,@r4
|
|
add #1,r4
|
|
shlr8 r1
|
|
mov.b r1,@r4
|
|
add #1,r4
|
|
#endif
|
|
L_copy:
|
|
mov r0,r5
|
|
|
|
/* Calculate the correct routine to handle the destination
|
|
alignment and simultaneously calculate the loop counts for
|
|
both the 2 word copy loop and byte copy loop. */
|
|
mova L_jumptable,r0
|
|
mov r0,r1
|
|
mov r4,r0
|
|
mov r6,r7
|
|
and #3,r0
|
|
shlr2 r7
|
|
shll r0
|
|
shlr r7
|
|
mov.w @(r0,r1),r2
|
|
mov #7,r0
|
|
braf r2
|
|
and r0,r6
|
|
L_base:
|
|
|
|
.balign 4
|
|
L_jumptable:
|
|
.word L_copydest0 - L_base
|
|
.word L_copydest1_or_3 - L_base
|
|
.word L_copydest2 - L_base
|
|
.word L_copydest1_or_3 - L_base
|
|
|
|
.balign 4
|
|
/* Copy routine for (dest mod 4) == 1 or == 3. */
|
|
L_copydest1_or_3:
|
|
add #-1,r4
|
|
.balignw 4,0x0009
|
|
L_copydest1_or_3_loop:
|
|
mov.l @r5+,r0 /* Read first longword. */
|
|
dt r7
|
|
mov.l @r5+,r1 /* Read second longword. */
|
|
#if __BYTE_ORDER == __BIG_ENDIAN
|
|
/* Write first longword as byte, word, byte. */
|
|
mov.b r0,@(4,r4)
|
|
shlr8 r0
|
|
mov.w r0,@(2,r4)
|
|
shlr16 r0
|
|
mov.b r0,@(1,r4)
|
|
mov r1,r0
|
|
/* Write second longword as byte, word, byte. */
|
|
mov.b r0,@(8,r4)
|
|
shlr8 r0
|
|
mov.w r0,@(6,r4)
|
|
shlr16 r0
|
|
mov.b r0,@(5,r4)
|
|
#else
|
|
/* Write first longword as byte, word, byte. */
|
|
mov.b r0,@(1,r4)
|
|
shlr8 r0
|
|
mov.w r0,@(2,r4)
|
|
shlr16 r0
|
|
mov.b r0,@(4,r4)
|
|
mov r1,r0
|
|
/* Write second longword as byte, word, byte. */
|
|
mov.b r0,@(5,r4)
|
|
shlr8 r0
|
|
mov.w r0,@(6,r4)
|
|
shlr16 r0
|
|
mov.b r0,@(8,r4)
|
|
#endif
|
|
bf/s L_copydest1_or_3_loop
|
|
add #8,r4
|
|
|
|
bra L_byteloop_init
|
|
add #1,r4
|
|
|
|
.balign 4
|
|
/* Copy routine for (dest mod 4) == 2. */
|
|
L_copydest2:
|
|
L_copydest2_loop:
|
|
mov.l @r5+,r0
|
|
dt r7
|
|
mov.l @r5+,r1
|
|
#if __BYTE_ORDER == __BIG_ENDIAN
|
|
mov.w r0,@(2,r4)
|
|
shlr16 r0
|
|
mov.w r0,@r4
|
|
mov r1,r0
|
|
mov.w r0,@(6,r4)
|
|
shlr16 r0
|
|
mov.w r0,@(4,r4)
|
|
#else
|
|
mov.w r0,@r4
|
|
shlr16 r0
|
|
mov.w r0,@(2,r4)
|
|
mov r1,r0
|
|
mov.w r0,@(4,r4)
|
|
shlr16 r0
|
|
mov.w r0,@(6,r4)
|
|
#endif
|
|
bf/s L_copydest2_loop
|
|
add #8,r4
|
|
|
|
bra L_byteloop_init
|
|
nop
|
|
|
|
.balign 4
|
|
/* Copy routine for (dest mod 4) == 0. */
|
|
L_copydest0:
|
|
add #-8,r4
|
|
.balignw 4,0x0009
|
|
L_copydest0_loop:
|
|
mov.l @r5+,r0
|
|
dt r7
|
|
mov.l @r5+,r1
|
|
add #8,r4
|
|
mov.l r0,@r4
|
|
bf/s L_copydest0_loop
|
|
mov.l r1,@(4,r4)
|
|
|
|
add #8,r4 /* Fall through. */
|
|
|
|
L_byteloop_init:
|
|
tst r6,r6
|
|
bt L_exit
|
|
|
|
.balignw 4,0x0009
|
|
/* Copy remaining bytes. */
|
|
L_byteloop:
|
|
mov.b @r5+,r0
|
|
dt r6
|
|
mov.b r0,@r4
|
|
bf/s L_byteloop
|
|
add #1,r4
|
|
|
|
L_exit:
|
|
rts
|
|
mov r3,r0 /* Return destination. */
|
|
END(memcpy)
|