diff options
Diffstat (limited to 'lib/libc/mips/string/strcmp.S')
| -rw-r--r-- | lib/libc/mips/string/strcmp.S | 68 |
1 files changed, 68 insertions, 0 deletions
diff --git a/lib/libc/mips/string/strcmp.S b/lib/libc/mips/string/strcmp.S new file mode 100644 index 0000000..8a99056 --- /dev/null +++ b/lib/libc/mips/string/strcmp.S @@ -0,0 +1,68 @@ +/* $NetBSD: strcmp.S,v 1.2 2009/12/14 00:39:00 matt Exp $ */ + +/*- + * Copyright (c) 1991, 1993 + * The Regents of the University of California. All rights reserved. + * + * This code is derived from software contributed to Berkeley by + * Ralph Campbell. + * + * 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. + */ + +#include <machine/asm.h> +__FBSDID("$FreeBSD$"); + +#if defined(LIBC_SCCS) && !defined(lint) + ASMSTR("from: @(#)strcmp.s 8.1 (Berkeley) 6/4/93") + ASMSTR("$NetBSD: strcmp.S,v 1.2 2009/12/14 00:39:00 matt Exp $") +#endif /* LIBC_SCCS and not lint */ + +#ifdef __ABICALLS__ + .abicalls +#endif + +/* + * NOTE: this version assumes unsigned chars in order to be "8 bit clean". + */ +LEAF(strcmp) +1: + lbu t0, 0(a0) # get two bytes and compare them + lbu t1, 0(a1) + beq t0, zero, LessOrEq # end of first string? + bne t0, t1, NotEq + lbu t0, 1(a0) # unroll loop + lbu t1, 1(a1) + PTR_ADD a0, a0, 2 + beq t0, zero, LessOrEq # end of first string? + PTR_ADD a1, a1, 2 + beq t0, t1, 1b +NotEq: + subu v0, t0, t1 + j ra +LessOrEq: + subu v0, zero, t1 + j ra +END(strcmp) |
