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glibc/sysdeps/vax/strcmp.s
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/* | |
* Copyright (c) 1983 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. | |
* 4. 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. | |
*/ | |
#if defined(LIBC_SCCS) && !defined(lint) | |
.asciz "@(#)strcmp.s 5.6 (Berkeley) 6/1/90" | |
#endif /* LIBC_SCCS and not lint */ | |
/* | |
* Compare string s1 lexicographically to string s2. | |
* Return: | |
* 0 s1 == s2 | |
* > 0 s1 > s2 | |
* < 0 s2 < s2 | |
* | |
* strcmp(s1, s2) | |
* char *s1, *s2; | |
*/ | |
#include "DEFS.h" | |
ENTRY(strcmp, 0) | |
movl 4(ap),r1 # r1 = s1 | |
movl 8(ap),r3 # r3 = s2 | |
subb3 (r3),(r1),r0 # quick check for first char different | |
beql 1f # have to keep checking | |
cvtbl r0,r0 | |
ret | |
1: | |
clrl r5 # calculate min bytes to next page boundary | |
subb3 r1,$255,r5 # r5 = (bytes - 1) to end of page for s1 | |
subb3 r3,$255,r0 # r0 = (bytes - 1) to end of page for s2 | |
cmpb r0,r5 # r5 = min(r0, r5); | |
bgtru 2f | |
movb r0,r5 | |
2: | |
incl r5 # r5 = min bytes to next page boundary | |
cmpc3 r5,(r1),(r3) # compare strings | |
bneq 3f | |
subl2 r5,r1 # check if found null yet | |
locc $0,r5,(r1) | |
beql 1b # not yet done, continue checking | |
subl2 r0,r3 | |
mnegb (r3),r0 # r0 = '\0' - *s2 | |
cvtbl r0,r0 | |
ret | |
3: | |
subl2 r0,r5 # check for null in matching string | |
subl2 r5,r1 | |
locc $0,r5,(r1) | |
bneq 4f | |
subb3 (r3),(r1),r0 # r0 = *s1 - *s2 | |
cvtbl r0,r0 | |
ret | |
4: | |
clrl r0 # both the same to null | |
ret |