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Diffstat (limited to 'sysdeps/vax/memcmp.s')
| -rw-r--r-- | sysdeps/vax/memcmp.s | 61 |
1 files changed, 61 insertions, 0 deletions
diff --git a/sysdeps/vax/memcmp.s b/sysdeps/vax/memcmp.s new file mode 100644 index 0000000000..3854fd8e4a --- /dev/null +++ b/sysdeps/vax/memcmp.s @@ -0,0 +1,61 @@ +/*- + * Copyright (c) 1990 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. All advertising materials mentioning features or use of this software + * must display the following acknowledgement: + * This product includes software developed by the University of + * California, Berkeley and its contributors. + * 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 "@(#)memcmp.s 5.1 (Berkeley) 5/15/90" +#endif /* LIBC_SCCS and not lint */ + +/* int memcmp(s1, s2, n) */ + +#include "DEFS.h" + +ENTRY(memcmp, 0) + movl 4(ap),r1 /* r1 = s1 */ + movq 8(ap),r3 /* r3 = s2; r4 = n */ + movzwl $65535,r5 +0: + cmpl r4,r5 + jgtru 3f /* handle stupid cmpc3 limitation */ + cmpc3 r4,(r1),(r3) /* compare */ + beql 2f /* done if same (r0 = 0) */ +1: + movzbl (r1),r0 + movzbl (r3),r2 + subl2 r2,r0 /* return *s1 - *s2; s1,s2 unsigned chars */ +2: + ret +3: + subl2 r5,r4 /* do 64K; adjust count */ + cmpc3 r5,(r1),(r3) + jeql 0b /* loop if same */ + jbr 1b |