Annotation of sys/lib/libkern/arch/mips64/strcmp.S, Revision 1.1.1.1
1.1 nbrk 1: /* $OpenBSD: strcmp.S,v 1.4 2004/10/08 14:42:09 pefo Exp $ */
2: /*-
3: * Copyright (c) 1991, 1993
4: * The Regents of the University of California. All rights reserved.
5: *
6: * This code is derived from software contributed to Berkeley by
7: * Ralph Campbell.
8: *
9: * Redistribution and use in source and binary forms, with or without
10: * modification, are permitted provided that the following conditions
11: * are met:
12: * 1. Redistributions of source code must retain the above copyright
13: * notice, this list of conditions and the following disclaimer.
14: * 2. Redistributions in binary form must reproduce the above copyright
15: * notice, this list of conditions and the following disclaimer in the
16: * documentation and/or other materials provided with the distribution.
17: * 3. Neither the name of the University nor the names of its contributors
18: * may be used to endorse or promote products derived from this software
19: * without specific prior written permission.
20: *
21: * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
22: * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
23: * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
24: * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
25: * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
26: * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
27: * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
28: * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
29: * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
30: * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
31: * SUCH DAMAGE.
32: */
33:
34: #include "DEFS.h"
35:
36:
37: /*
38: * NOTE: this version assumes unsigned chars in order to be "8 bit clean".
39: */
40: LEAF(strcmp, 0)
41: .set noreorder
42: 1:
43: lbu t0, 0(a0) # get two bytes and compare them
44: lbu t1, 0(a1)
45: beq t0, zero, LessOrEq # end of first string?
46: nop
47: bne t0, t1, NotEq
48: nop
49: lbu t0, 1(a0) # unroll loop
50: lbu t1, 1(a1)
51: beq t0, zero, LessOrEq # end of first string?
52: PTR_ADDU a0, a0, 2
53: beq t0, t1, 1b
54: PTR_ADDU a1, a1, 2
55: NotEq:
56: j ra
57: PTR_SUBU v0, t0, t1
58: LessOrEq:
59: j ra
60: PTR_SUBU v0, zero, t1
61: END(strcmp)
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