From a334319f6530564d22e775935d9c91663623a1b4 Mon Sep 17 00:00:00 2001 From: Ulrich Drepper Date: Wed, 22 Dec 2004 20:10:10 +0000 Subject: (CFLAGS-tst-align.c): Add -mpreferred-stack-boundary=4. --- sysdeps/arm/memset.S | 67 ++++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 67 insertions(+) create mode 100644 sysdeps/arm/memset.S (limited to 'sysdeps/arm/memset.S') diff --git a/sysdeps/arm/memset.S b/sysdeps/arm/memset.S new file mode 100644 index 0000000000..1e2699d077 --- /dev/null +++ b/sysdeps/arm/memset.S @@ -0,0 +1,67 @@ +/* Copyright (C) 1998, 2003 Free Software Foundation, Inc. + This file is part of the GNU C Library. + Contributed by Philip Blundell + + 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 + +/* void *memset (dstpp, c, len) */ + +ENTRY(memset) + mov r3, r0 + cmp r2, #8 + bcc 2f @ less than 8 bytes to move + +1: + tst r3, #3 @ aligned yet? + strneb r1, [r3], #1 + subne r2, r2, #1 + bne 1b + + orr r1, r1, r1, lsl $8 + orr r1, r1, r1, lsl $16 + +1: + subs r2, r2, #8 + strcs r1, [r3], #4 @ store up to 32 bytes per loop iteration + strcs r1, [r3], #4 + subcss r2, r2, #8 + strcs r1, [r3], #4 + strcs r1, [r3], #4 + subcss r2, r2, #8 + strcs r1, [r3], #4 + strcs r1, [r3], #4 + subcss r2, r2, #8 + strcs r1, [r3], #4 + strcs r1, [r3], #4 + bcs 1b + + and r2, r2, #7 +2: + subs r2, r2, #1 @ store up to 4 bytes per loop iteration + strcsb r1, [r3], #1 + subcss r2, r2, #1 + strcsb r1, [r3], #1 + subcss r2, r2, #1 + strcsb r1, [r3], #1 + subcss r2, r2, #1 + strcsb r1, [r3], #1 + bcs 2b + + DO_RET(lr) +END(memset) +libc_hidden_builtin_def (memset) -- cgit 1.4.1