1999-01-08 01:59:28 +08:00
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/* memset/bzero -- set memory area to CH/0
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Highly optimized version for ix86, x>=6.
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2000-06-09 14:14:39 +08:00
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Copyright (C) 1999, 2000 Free Software Foundation, Inc.
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1999-01-08 01:59:28 +08:00
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This file is part of the GNU C Library.
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1999-01-08 06:36:12 +08:00
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Contributed by Ulrich Drepper <drepper@cygnus.com>, 1999.
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1999-01-08 01:59:28 +08:00
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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 Library General Public License as
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published by the Free Software Foundation; either version 2 of the
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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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Library General Public License for more details.
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You should have received a copy of the GNU Library General Public
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License along with the GNU C Library; see the file COPYING.LIB. If not,
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write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
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Boston, MA 02111-1307, USA. */
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#include <sysdep.h>
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#include "asm-syntax.h"
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2000-06-09 14:14:39 +08:00
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#include "bp-asm.h"
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1999-01-08 01:59:28 +08:00
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2000-06-09 14:14:39 +08:00
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/* BEWARE: `#ifdef memset' means that memset is redefined as `bzero' */
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#define BZERO_P (defined memset)
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1999-01-08 01:59:28 +08:00
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2000-06-09 14:14:39 +08:00
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#define PARMS LINKAGE+4 /* space for 1 saved reg */
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#if BZERO_P
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# define DEST PARMS
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# define LEN DEST+PTR_SIZE
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#else
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# define RTN PARMS
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# define DEST RTN+RTN_SIZE
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# define CHR DEST+PTR_SIZE
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# define LEN CHR+4
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#endif
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1999-01-08 01:59:28 +08:00
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.text
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ENTRY (memset)
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2000-06-09 14:14:39 +08:00
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ENTER
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1999-01-08 01:59:28 +08:00
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cld
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pushl %edi
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2000-06-09 14:14:39 +08:00
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movl DEST(%esp), %edx
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movl LEN(%esp), %ecx
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#if BZERO_P
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xorl %eax, %eax /* fill with 0 */
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1999-01-08 01:59:28 +08:00
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#else
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2000-06-09 14:14:39 +08:00
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movzbl CHR(%esp), %eax
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1999-01-08 01:59:28 +08:00
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#endif
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jecxz 1f
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movl %edx, %edi
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andl $3, %edx
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jz 2f
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jnp 3f
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stosb
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decl %ecx
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jz 1f
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3: stosb
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decl %ecx
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jz 1f
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xorl $3, %edx
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jz 2f
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stosb
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decl %ecx
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2: movl %ecx, %edx
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shrl $2, %ecx
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andl $3, %edx
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2000-06-09 14:14:39 +08:00
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#if !BZERO_P
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1999-01-08 01:59:28 +08:00
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imul $0x01010101, %eax
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#endif
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rep
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stosl
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movl %edx, %ecx
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rep
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stosb
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1999-01-08 06:36:12 +08:00
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1:
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2000-06-09 14:14:39 +08:00
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#if !BZERO_P
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movl DEST(%esp), %eax
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1999-01-08 06:36:12 +08:00
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#endif
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1999-01-08 01:59:28 +08:00
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popl %edi
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2000-06-09 14:14:39 +08:00
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LEAVE
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#if BZERO_P
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1999-01-08 01:59:28 +08:00
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ret
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2000-06-09 14:14:39 +08:00
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#else
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RET_PTR
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#endif
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1999-01-08 01:59:28 +08:00
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END (memset)
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