Significantly faster memcpy/memmove/bcopy and memset/bzero
This commit is contained in:
dsl
parent
7c8e4cdaea
commit
c327a133c6
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@ -1,101 +1,5 @@
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/*-
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* Copyright (c) 1990 The Regents of the University of California.
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* All rights reserved.
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*
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* This code is derived from locore.s.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by the University of
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* California, Berkeley and its contributors.
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* 4. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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/* $NetBSD: bcopy.S,v 1.4 2003/04/15 22:49:50 dsl Exp $ */
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#include <machine/asm.h>
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#if defined(LIBC_SCCS)
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RCSID("$NetBSD: bcopy.S,v 1.3 2002/07/10 06:02:09 kent Exp $")
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#endif
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/*
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* (ov)bcopy (src,dst,cnt)
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* ws@tools.de (Wolfgang Solfrank, TooLs GmbH) +49-228-985800
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*/
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#ifdef MEMCOPY
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ENTRY(memcpy)
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#else
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#ifdef MEMMOVE
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ENTRY(memmove)
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#else
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ENTRY(bcopy)
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#endif
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#endif
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pushl %esi
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pushl %edi
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#if defined(MEMCOPY) || defined(MEMMOVE)
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movl 12(%esp),%edi
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movl 16(%esp),%esi
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movl %edi,%eax /* return value */
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#else
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movl 12(%esp),%esi
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movl 16(%esp),%edi
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#endif
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movl 20(%esp),%ecx
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movl %edi,%edx
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subl %esi,%edx
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cmpl %ecx,%edx /* overlapping? */
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movl %ecx,%edx
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jb 1f
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cld /* nope, copy forwards. */
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shrl $2,%ecx /* copy by words */
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rep
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movsl
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movl %edx,%ecx
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andl $3,%ecx /* any bytes left? */
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rep
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movsb
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popl %edi
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popl %esi
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ret
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1:
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addl %ecx,%edi /* copy backwards. */
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addl %ecx,%esi
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std
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andl $3,%ecx /* any fractional bytes? */
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decl %edi
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decl %esi
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rep
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movsb
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movl %edx,%ecx /* copy remainder by words */
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shrl $2,%ecx
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subl $3,%esi
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subl $3,%edi
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rep
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movsl
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popl %edi
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popl %esi
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cld
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ret
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#define BCOPY
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#define NO_OVERLAP
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#include "memcpy.S"
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@ -1,46 +1,10 @@
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/*
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* Written by J.T. Conklin <jtc@netbsd.org>.
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* Public domain.
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*/
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/* $NetBSD: bzero.S,v 1.7 2003/04/15 22:49:50 dsl Exp $ */
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#include <machine/asm.h>
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#if defined(LIBC_SCCS)
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RCSID("$NetBSD: bzero.S,v 1.6 1998/02/22 08:14:57 mycroft Exp $")
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RCSID("$NetBSD: bzero.S,v 1.7 2003/04/15 22:49:50 dsl Exp $")
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#endif
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ENTRY(bzero)
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pushl %edi
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movl 8(%esp),%edi
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movl 12(%esp),%edx
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cld /* set fill direction forward */
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xorl %eax,%eax /* set fill data to 0 */
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/*
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* if the string is too short, it's really not worth the overhead
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* of aligning to word boundries, etc. So we jump to a plain
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* unaligned set.
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*/
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cmpl $16,%edx
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jb L1
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movl %edi,%ecx /* compute misalignment */
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negl %ecx
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andl $3,%ecx
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subl %ecx,%edx
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rep /* zero until word aligned */
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stosb
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movl %edx,%ecx /* zero by words */
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shrl $2,%ecx
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andl $3,%edx
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rep
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stosl
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L1: movl %edx,%ecx /* zero remainder by bytes */
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rep
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stosb
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popl %edi
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ret
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#define BZERO
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#include "memset.S"
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@ -1,4 +1,136 @@
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/* $NetBSD: memcpy.S,v 1.2 1998/02/22 08:14:58 mycroft Exp $ */
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/* $NetBSD: memcpy.S,v 1.3 2003/04/15 22:49:50 dsl Exp $ */
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#define MEMCOPY
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#include "bcopy.S"
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/*-
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* Copyright (c) 1990 The Regents of the University of California.
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* All rights reserved.
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*
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* This code is derived from locore.s.
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* Optimised by David Laight 2003
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by the University of
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* California, Berkeley and its contributors.
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* 4. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#include <machine/asm.h>
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#if defined(LIBC_SCCS)
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RCSID("$NetBSD: memcpy.S,v 1.3 2003/04/15 22:49:50 dsl Exp $")
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#endif
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/*
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* (ov)bcopy (src,dst,cnt)
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* ws@tools.de (Wolfgang Solfrank, TooLs GmbH) +49-228-985800
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*/
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#ifdef BCOPY
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ENTRY(bcopy)
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#else
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#ifdef MEMMOVE
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ENTRY(memmove)
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#else
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#define NO_OVERLAP
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ENTRY(memcpy)
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#endif
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#endif
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push %esi
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mov %edi,%edx
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#if defined(BCOPY)
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movl 8(%esp),%esi
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movl 12(%esp),%edi
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#else
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movl 8(%esp),%edi
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movl 12(%esp),%esi
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#endif
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movl 16(%esp),%ecx
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#if defined(NO_OVERLAP)
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movl %ecx,%eax
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#else
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movl %edi,%eax
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subl %esi,%eax
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cmpl %ecx,%eax /* overlapping? */
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movl %ecx,%eax
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jb backwards
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#endif
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cld /* nope, copy forwards. */
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shrl $2,%ecx /* copy by words */
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rep
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movsl
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and $3,%eax /* any bytes left? */
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jnz trailing
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done:
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#if defined(MEMCPY) || defined(MEMMOVE)
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movl 8(%esp),%eax
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#endif
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mov %edx,%edi
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pop %esi
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ret
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trailing:
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cmp $2,%eax
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jb 1f
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movw (%esi),%ax
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movw %ax,(%edi)
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je done
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movb 2(%esi),%al
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movb %al,2(%edi)
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jmp done
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1: movb (%esi),%al
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movb %al,(%edi)
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jmp done
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#if !defined(NO_OVERLAP)
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backwards:
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addl %ecx,%edi /* copy backwards. */
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addl %ecx,%esi
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and $3,%eax /* any fractional bytes? */
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jnz back_align
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back_aligned:
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shrl $2,%ecx
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subl $4,%esi
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subl $4,%edi
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std
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rep
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movsl
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cld
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jmp done
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back_align:
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sub %eax,%esi
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sub %eax,%edi
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cmp $2,%eax
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jb 1f
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je 2f
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movb 2(%esi),%al
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movb %al,2(%edi)
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2: movw (%esi),%ax
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movw %ax,(%edi)
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jmp back_aligned
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1: movb (%esi),%al
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movb %al,(%edi)
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jmp back_aligned
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#endif
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@ -1,4 +1,4 @@
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/* $NetBSD: memmove.S,v 1.1 1998/08/04 01:41:26 perry Exp $ */
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/* $NetBSD: memmove.S,v 1.2 2003/04/15 22:49:50 dsl Exp $ */
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#define MEMMOVE
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#include "bcopy.S"
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#include "memcpy.S"
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@ -1,58 +1,119 @@
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/*
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* Written by J.T. Conklin <jtc@netbsd.org>.
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* Public domain.
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/* $NetBSD: memset.S,v 1.5 2003/04/15 22:49:50 dsl Exp $ */
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/*-
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* Copyright (c) 2003 The NetBSD Foundation, Inc.
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* All rights reserved.
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*
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* This code is derived from software contributed to The NetBSD Foundation
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* by David Laight.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by the NetBSD
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* Foundation, Inc. and its contributors.
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* 4. Neither the name of The NetBSD Foundation nor the names of its
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* contributors may be used to endorse or promote products derived
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* from this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
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* ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
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* TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
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* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*/
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#include <machine/asm.h>
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#if defined(LIBC_SCCS)
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RCSID("$NetBSD: memset.S,v 1.4 1998/02/22 08:14:58 mycroft Exp $")
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RCSID("$NetBSD: memset.S,v 1.5 2003/04/15 22:49:50 dsl Exp $")
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#endif
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#ifdef BZERO
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ENTRY(bzero)
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#else
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ENTRY(memset)
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#endif
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#ifdef BZERO
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movl 8(%esp),%ecx
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xor %eax,%eax
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#else
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movl 12(%esp),%ecx
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movzbl 8(%esp),%eax /* unsigned char, zero extend */
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#endif
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#ifndef LIBKERN_OPTIMISE_SPACE
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cmpl $0x0f,%ecx /* avoid mispredicted branch... */
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#endif
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pushl %edi
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pushl %ebx
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movl 12(%esp),%edi
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movzbl 16(%esp),%eax /* unsigned char, zero extend */
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movl 20(%esp),%ecx
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pushl %edi /* push address of buffer */
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movl 8(%esp),%edi
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cld /* set fill direction forward */
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#ifndef LIBKERN_OPTIMISE_SPACE
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/*
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* if the string is too short, it's really not worth the overhead
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* of aligning to word boundries, etc. So we jump to a plain
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* unaligned set.
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*
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* NB aligning the transfer is actually pointless on my athlon 700,
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* It does make a difference to a PII though.
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*
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* The PII, PIII and PIV allseem to have a massive performance
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* drop when the initial target address is an odd multiple of 4.
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*/
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cmpl $0x0f,%ecx
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jle L1
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jbe by_bytes
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#ifndef BZERO
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movb %al,%ah /* copy char to all bytes in word */
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movl %eax,%edx
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sall $16,%eax
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orl %edx,%eax
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#endif
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movl %edi,%edx /* compute misalignment */
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negl %edx
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andl $3,%edx
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movl %ecx,%ebx
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subl %edx,%ebx
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movl %edx,%ecx /* set until word aligned */
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rep
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stosb
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movl %ebx,%ecx
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shrl $2,%ecx /* set by words */
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movl %edi,%edx /* detect misalignment */
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neg %edx
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andl $7,%edx
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jnz align
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aligned:
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movl %eax,-4(%edi,%ecx) /* zap last 4 bytes */
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shrl $2,%ecx /* zero by words */
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rep
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stosl
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done:
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#ifndef BZERO
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movl 8(%esp),%eax /* return address of buffer */
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#endif
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pop %edi
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ret
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movl %ebx,%ecx /* set remainder by bytes */
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andl $3,%ecx
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L1: rep
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align:
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movl %eax,(%edi) /* zap first 8 bytes */
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movl %eax,4(%edi)
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subl %edx,%ecx /* remove from main count */
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add %edx,%edi
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jmp aligned
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by_bytes:
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#endif /* LIBKERN_OPTIMISE_SPACE */
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rep
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stosb
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popl %eax /* pop address of buffer */
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popl %ebx
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#ifndef BZERO
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movl 8(%esp),%eax /* return address of buffer */
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#endif
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popl %edi
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ret
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