More assembler code.
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mycroft
parent
a0f51b3da9
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8449f5103c
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@ -38,7 +38,7 @@
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#if defined(LIBC_SCCS) && !defined(lint)
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.text
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/*.asciz "from: @(#)bcmp.s 5.1 (Berkeley) 5/12/90"*/
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.asciz "$Id: memcmp.S,v 1.2 1993/12/06 22:51:41 mycroft Exp $"
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.asciz "$Id: memcmp.S,v 1.3 1993/12/06 23:08:46 mycroft Exp $"
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#endif /* LIBC_SCCS and not lint */
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/* memcmp(s1, s2, n) */
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@ -86,8 +86,8 @@ bcbloop:
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jne bcbloop /* still more, keep going */
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rts
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bcnoteql:
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subal #4,a0
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subal #4,a1
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subql #4,a0
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subql #4,a1
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movl #4,d0
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jra bcbloop
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bcnoteq:
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@ -0,0 +1,94 @@
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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 software contributed to Berkeley by
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* the Systems Programming Group of the University of Utah Computer
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* Science Department.
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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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#if defined(LIBC_SCCS) && !defined(lint)
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.text
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/*.asciz "from: @(#)bzero.s 5.1 (Berkeley) 5/12/90"*/
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.asciz "$Id: memset.S,v 1.1 1993/12/06 23:08:48 mycroft Exp $"
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#endif /* LIBC_SCCS and not lint */
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#include "DEFS.h"
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/*
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* This is probably not the best we can do, but it is still much
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* faster than the C version in the portable gen directory.
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*
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* Things that might help:
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* - unroll the longword loop (might not be good for a 68020)
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* - longword, as opposed to word, align when possible (only on the 68020)
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* - use nested DBcc instructions or use one and limit size to 64K
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*/
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ENTRY(memset)
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movl d2,sp@-
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movl sp@(8),a0 /* destination */
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movb sp@(15),d2 /* character */
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movl sp@(16),d0 /* count */
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jeq bzdone /* nothing to do */
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movl a0,d1
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btst #0,d1 /* address odd? */
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jeq bzeven /* no, skip alignment */
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movb d2,a0@+ /* set one byte */
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subql #1,d0 /* adjust count */
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jeq bzdone /* if zero, all done */
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bzeven:
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movl d0,d1
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lsrl #2,d1 /* convert to longword count */
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cmpl #4,d1
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jl bzbloop /* too small to be worthwhile */
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clrl d1 /* replicate byte to fill longword */
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movb d2,d1
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lsll #8,d1
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orl d1,d2
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movw d2,d1
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lsll #16,d1
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orl d1,d2
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movl d0,d1
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lsrl #2,d1 /* recalculate longword count */
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bzlloop:
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movl d2,a0@+ /* set one longword */
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subql #1,d1 /* adjust count */
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jne bzlloop /* still more, keep going */
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andl #3,d0 /* what remains */
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jeq bzdone /* nothing, all done */
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bzbloop:
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movb d2,a0@+ /* set one byte */
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subql #1,d0 /* adjust count */
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jne bzbloop /* still more, keep going */
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bzdone:
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movl sp@(8),d0 /* return destination */
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movl sp@+,d2
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rts
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