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NetBSD/lib/libc/arch/m68k/string/strcmp.S

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Fix spelling of contributors name
1999-10-27 13:10:27 +04:00
/* $NetBSD: strcmp.S,v 1.14 1999/10/27 09:10:27 is Exp $ */
New style RCS ids, and employ the RCSID() macro.
1995-11-17 23:21:10 +03:00
Machine-dependent files for generic m68k machines (copied from hp300)
1993-11-26 02:36:47 +03:00
/*-
New implementations of strcmp() and strncmp(). This code uses subb instead of cmpb to compare chars. When they are not equal, the function's return value is computed by sign extending the difference. The basic idea was contributed by Hiroshi Horitomo <horimoto@cs-aoi.cs.sist.ac.jp> in PR #3223, but his implementation used additional instructions to compute the return value. Also, the series of insns used to compare one pair of characters has been unrolled 4 times. This helps the 680[23]0, where the cost of a taken branch is significantly more than that of a not-taken branch.
1997-05-19 00:32:20 +04:00
* Copyright (c) 1997 The NetBSD Foundation, Inc.
Machine-dependent files for generic m68k machines (copied from hp300)
1993-11-26 02:36:47 +03:00
* All rights reserved.
*
New implementations of strcmp() and strncmp(). This code uses subb instead of cmpb to compare chars. When they are not equal, the function's return value is computed by sign extending the difference. The basic idea was contributed by Hiroshi Horitomo <horimoto@cs-aoi.cs.sist.ac.jp> in PR #3223, but his implementation used additional instructions to compute the return value. Also, the series of insns used to compare one pair of characters has been unrolled 4 times. This helps the 680[23]0, where the cost of a taken branch is significantly more than that of a not-taken branch.
1997-05-19 00:32:20 +04:00
* This code is derived from software contributed to The NetBSD Foundation
Fix spelling of contributors name
1999-10-27 13:10:27 +04:00
* by Hiroshi Horimoto <horimoto@cs-aoi.cs.sist.ac.jp> and
New implementations of strcmp() and strncmp(). This code uses subb instead of cmpb to compare chars. When they are not equal, the function's return value is computed by sign extending the difference. The basic idea was contributed by Hiroshi Horitomo <horimoto@cs-aoi.cs.sist.ac.jp> in PR #3223, but his implementation used additional instructions to compute the return value. Also, the series of insns used to compare one pair of characters has been unrolled 4 times. This helps the 680[23]0, where the cost of a taken branch is significantly more than that of a not-taken branch.
1997-05-19 00:32:20 +04:00
* by J.T. Conklin <jtc@netbsd.org>.
Machine-dependent files for generic m68k machines (copied from hp300)
1993-11-26 02:36:47 +03:00
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. All advertising materials mentioning features or use of this software
* must display the following acknowledgement:
New implementations of strcmp() and strncmp(). This code uses subb instead of cmpb to compare chars. When they are not equal, the function's return value is computed by sign extending the difference. The basic idea was contributed by Hiroshi Horitomo <horimoto@cs-aoi.cs.sist.ac.jp> in PR #3223, but his implementation used additional instructions to compute the return value. Also, the series of insns used to compare one pair of characters has been unrolled 4 times. This helps the 680[23]0, where the cost of a taken branch is significantly more than that of a not-taken branch.
1997-05-19 00:32:20 +04:00
* This product includes software developed by the NetBSD
* Foundation, Inc. and its contributors.
* 4. Neither the name of The NetBSD Foundation nor the names of its
* contributors may be used to endorse or promote products derived
* from this software without specific prior written permission.
Machine-dependent files for generic m68k machines (copied from hp300)
1993-11-26 02:36:47 +03:00
*
New implementations of strcmp() and strncmp(). This code uses subb instead of cmpb to compare chars. When they are not equal, the function's return value is computed by sign extending the difference. The basic idea was contributed by Hiroshi Horitomo <horimoto@cs-aoi.cs.sist.ac.jp> in PR #3223, but his implementation used additional instructions to compute the return value. Also, the series of insns used to compare one pair of characters has been unrolled 4 times. This helps the 680[23]0, where the cost of a taken branch is significantly more than that of a not-taken branch.
1997-05-19 00:32:20 +04:00
* THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
* ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
* TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
Machine-dependent files for generic m68k machines (copied from hp300)
1993-11-26 02:36:47 +03:00
*/
#include <machine/asm.h> instead of "DEFS.h"
1997-01-04 06:26:18 +03:00
#include <machine/asm.h>
Fix a brain-o by me; if I'm going to use stuff in <machine/asm.h>, I better darn well include it in the right place. "Hello, McFly!"
1995-11-29 02:40:47 +03:00
Machine-dependent files for generic m68k machines (copied from hp300)
1993-11-26 02:36:47 +03:00
#if defined(LIBC_SCCS) && !defined(lint)
Fix spelling of contributors name
1999-10-27 13:10:27 +04:00
RCSID("$NetBSD: strcmp.S,v 1.14 1999/10/27 09:10:27 is Exp $")
Machine-dependent files for generic m68k machines (copied from hp300)
1993-11-26 02:36:47 +03:00
#endif /* LIBC_SCCS and not lint */
ENTRY(strcmp)
Add register prefixes.
1999-10-26 03:48:07 +04:00
movl %sp@(4),%a0
movl %sp@(8),%a1
New implementations of strcmp() and strncmp(). This code uses subb instead of cmpb to compare chars. When they are not equal, the function's return value is computed by sign extending the difference. The basic idea was contributed by Hiroshi Horitomo <horimoto@cs-aoi.cs.sist.ac.jp> in PR #3223, but his implementation used additional instructions to compute the return value. Also, the series of insns used to compare one pair of characters has been unrolled 4 times. This helps the 680[23]0, where the cost of a taken branch is significantly more than that of a not-taken branch.
1997-05-19 00:32:20 +04:00
L1: /* unrolled by 4 for 680[23]0's */
Add register prefixes.
1999-10-26 03:48:07 +04:00
movb %a0@+,%d1
New implementations of strcmp() and strncmp(). This code uses subb instead of cmpb to compare chars. When they are not equal, the function's return value is computed by sign extending the difference. The basic idea was contributed by Hiroshi Horitomo <horimoto@cs-aoi.cs.sist.ac.jp> in PR #3223, but his implementation used additional instructions to compute the return value. Also, the series of insns used to compare one pair of characters has been unrolled 4 times. This helps the 680[23]0, where the cost of a taken branch is significantly more than that of a not-taken branch.
1997-05-19 00:32:20 +04:00
jeq L2
Add register prefixes.
1999-10-26 03:48:07 +04:00
subb %a1@+,%d1
New implementations of strcmp() and strncmp(). This code uses subb instead of cmpb to compare chars. When they are not equal, the function's return value is computed by sign extending the difference. The basic idea was contributed by Hiroshi Horitomo <horimoto@cs-aoi.cs.sist.ac.jp> in PR #3223, but his implementation used additional instructions to compute the return value. Also, the series of insns used to compare one pair of characters has been unrolled 4 times. This helps the 680[23]0, where the cost of a taken branch is significantly more than that of a not-taken branch.
1997-05-19 00:32:20 +04:00
jne L3
Add register prefixes.
1999-10-26 03:48:07 +04:00
movb %a0@+,%d1
New implementations of strcmp() and strncmp(). This code uses subb instead of cmpb to compare chars. When they are not equal, the function's return value is computed by sign extending the difference. The basic idea was contributed by Hiroshi Horitomo <horimoto@cs-aoi.cs.sist.ac.jp> in PR #3223, but his implementation used additional instructions to compute the return value. Also, the series of insns used to compare one pair of characters has been unrolled 4 times. This helps the 680[23]0, where the cost of a taken branch is significantly more than that of a not-taken branch.
1997-05-19 00:32:20 +04:00
jeq L2
Add register prefixes.
1999-10-26 03:48:07 +04:00
subb %a1@+,%d1
New implementations of strcmp() and strncmp(). This code uses subb instead of cmpb to compare chars. When they are not equal, the function's return value is computed by sign extending the difference. The basic idea was contributed by Hiroshi Horitomo <horimoto@cs-aoi.cs.sist.ac.jp> in PR #3223, but his implementation used additional instructions to compute the return value. Also, the series of insns used to compare one pair of characters has been unrolled 4 times. This helps the 680[23]0, where the cost of a taken branch is significantly more than that of a not-taken branch.
1997-05-19 00:32:20 +04:00
jne L3
Add register prefixes.
1999-10-26 03:48:07 +04:00
movb %a0@+,%d1
New implementations of strcmp() and strncmp(). This code uses subb instead of cmpb to compare chars. When they are not equal, the function's return value is computed by sign extending the difference. The basic idea was contributed by Hiroshi Horitomo <horimoto@cs-aoi.cs.sist.ac.jp> in PR #3223, but his implementation used additional instructions to compute the return value. Also, the series of insns used to compare one pair of characters has been unrolled 4 times. This helps the 680[23]0, where the cost of a taken branch is significantly more than that of a not-taken branch.
1997-05-19 00:32:20 +04:00
jeq L2
Add register prefixes.
1999-10-26 03:48:07 +04:00
subb %a1@+,%d1
New implementations of strcmp() and strncmp(). This code uses subb instead of cmpb to compare chars. When they are not equal, the function's return value is computed by sign extending the difference. The basic idea was contributed by Hiroshi Horitomo <horimoto@cs-aoi.cs.sist.ac.jp> in PR #3223, but his implementation used additional instructions to compute the return value. Also, the series of insns used to compare one pair of characters has been unrolled 4 times. This helps the 680[23]0, where the cost of a taken branch is significantly more than that of a not-taken branch.
1997-05-19 00:32:20 +04:00
jne L3
Add register prefixes.
1999-10-26 03:48:07 +04:00
movb %a0@+,%d1
New implementations of strcmp() and strncmp(). This code uses subb instead of cmpb to compare chars. When they are not equal, the function's return value is computed by sign extending the difference. The basic idea was contributed by Hiroshi Horitomo <horimoto@cs-aoi.cs.sist.ac.jp> in PR #3223, but his implementation used additional instructions to compute the return value. Also, the series of insns used to compare one pair of characters has been unrolled 4 times. This helps the 680[23]0, where the cost of a taken branch is significantly more than that of a not-taken branch.
1997-05-19 00:32:20 +04:00
jeq L2
Add register prefixes.
1999-10-26 03:48:07 +04:00
subb %a1@+,%d1
New implementations of strcmp() and strncmp(). This code uses subb instead of cmpb to compare chars. When they are not equal, the function's return value is computed by sign extending the difference. The basic idea was contributed by Hiroshi Horitomo <horimoto@cs-aoi.cs.sist.ac.jp> in PR #3223, but his implementation used additional instructions to compute the return value. Also, the series of insns used to compare one pair of characters has been unrolled 4 times. This helps the 680[23]0, where the cost of a taken branch is significantly more than that of a not-taken branch.
1997-05-19 00:32:20 +04:00
jeq L1
I removed the extra instructions which compute the return value in Hiroshi Horitomo's implementation a bit too hastily. They are required to handle the unsigned comparison required by the standard.
1997-05-19 01:24:46 +04:00
Add register prefixes.
1999-10-26 03:48:07 +04:00
scs %d0
extbl %d0
movb %d1,%d0
Machine-dependent files for generic m68k machines (copied from hp300)
1993-11-26 02:36:47 +03:00
rts
New implementations of strcmp() and strncmp(). This code uses subb instead of cmpb to compare chars. When they are not equal, the function's return value is computed by sign extending the difference. The basic idea was contributed by Hiroshi Horitomo <horimoto@cs-aoi.cs.sist.ac.jp> in PR #3223, but his implementation used additional instructions to compute the return value. Also, the series of insns used to compare one pair of characters has been unrolled 4 times. This helps the 680[23]0, where the cost of a taken branch is significantly more than that of a not-taken branch.
1997-05-19 00:32:20 +04:00
Add register prefixes.
1999-10-26 03:48:07 +04:00
L2: subb %a1@,%d1
L3: scs %d0
extbl %d0
movb %d1,%d0
New implementations of strcmp() and strncmp(). This code uses subb instead of cmpb to compare chars. When they are not equal, the function's return value is computed by sign extending the difference. The basic idea was contributed by Hiroshi Horitomo <horimoto@cs-aoi.cs.sist.ac.jp> in PR #3223, but his implementation used additional instructions to compute the return value. Also, the series of insns used to compare one pair of characters has been unrolled 4 times. This helps the 680[23]0, where the cost of a taken branch is significantly more than that of a not-taken branch.
1997-05-19 00:32:20 +04:00
rts