diff options
Diffstat (limited to 'sys/lib/libkern/arch/vax/memcmp.S')
| -rw-r--r-- | sys/lib/libkern/arch/vax/memcmp.S | 65 |
1 files changed, 65 insertions, 0 deletions
diff --git a/sys/lib/libkern/arch/vax/memcmp.S b/sys/lib/libkern/arch/vax/memcmp.S new file mode 100644 index 00000000000..4ce069b3afd --- /dev/null +++ b/sys/lib/libkern/arch/vax/memcmp.S @@ -0,0 +1,65 @@ +/* $OpenBSD: memcmp.S,v 1.1 2009/08/19 19:47:53 miod Exp $ */ +/*- + * Copyright (c) 1990, 1993 + * The Regents of the University of California. All rights reserved. + * + * 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. Neither the name of the University nor the names of its contributors + * may be used to endorse or promote products derived from this software + * without specific prior written permission. + * + * THIS SOFTWARE IS PROVIDED BY THE REGENTS 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 REGENTS 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. + */ + +/* int memcmp(s1, s2, n) */ + +#include <machine/asm.h> + +ENTRY(memcmp, 0) + movl 12(ap),r0 + jeql 9f + movq 4(ap),r1 + ashl $-2,r0,r3 # convert len to long words + jeql 2f +1: + cmpl (r1)+,(r2)+ # no "cmpq" alas + jneq 7f + sobgtr r3,1b +2: + bicl3 $-4,r0,r3 # handle at most 3 extra bytes + jeql 4f +3: + cmpb (r1)+,(r2)+ + jneq 8f + sobgtr r3,3b +4: + clrl r0 # we had a match + ret +7: # backup, and do a byte compare + tstl -(r1) + tstl -(r2) + movl $4,r3 + jbr 3b +8: + movzbl -(r1),r3 + movzbl -(r2),r4 + subl3 r4,r3,r0 +9: + ret |