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69 lines
1.8 KiB
ArmAsm
69 lines
1.8 KiB
ArmAsm
/* Copyright (C) 1998, 2003 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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Contributed by Philip Blundell <philb@gnu.org>
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library; if not, write to the Free
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Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
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02111-1307 USA. */
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#include <sysdep.h>
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/* void *memset (dstpp, c, len) */
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ENTRY(memset)
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mov a4, a1
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cmp a3, $8 @ at least 8 bytes to do?
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blt 2f
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orr a2, a2, a2, lsl $8
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orr a2, a2, a2, lsl $16
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1:
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tst a4, $3 @ aligned yet?
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strneb a2, [a4], $1
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subne a3, a3, $1
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bne 1b
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mov ip, a2
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1:
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cmp a3, $8 @ 8 bytes still to do?
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blt 2f
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stmia a4!, {a2, ip}
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sub a3, a3, $8
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cmp a3, $8 @ 8 bytes still to do?
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blt 2f
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stmia a4!, {a2, ip}
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sub a3, a3, $8
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cmp a3, $8 @ 8 bytes still to do?
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blt 2f
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stmia a4!, {a2, ip}
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sub a3, a3, $8
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cmp a3, $8 @ 8 bytes still to do?
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stmgeia a4!, {a2, ip}
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subge a3, a3, $8
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bge 1b
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2:
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movs a3, a3 @ anything left?
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RETINSTR(moveq,pc,lr) @ nope
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rsb a3, a3, $7
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add pc, pc, a3, lsl $2
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mov r0, r0
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strb a2, [a4], $1
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strb a2, [a4], $1
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strb a2, [a4], $1
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strb a2, [a4], $1
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strb a2, [a4], $1
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strb a2, [a4], $1
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strb a2, [a4], $1
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RETINSTR(mov,pc,lr)
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END(memset)
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libc_hidden_builtin_def (memset)
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