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- /* $OpenBSD: strcmp.S,v 1.4 2004/10/08 14:42:09 pefo 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 "DEFS.h"
- /*
- * NOTE: this version assumes unsigned chars in order to be "8 bit clean".
- */
- LEAF(strcmp, 0)
- .set noreorder
- 1:
- lbu t0, 0(a0) # get two bytes and compare them
- lbu t1, 0(a1)
- beq t0, zero, LessOrEq # end of first string?
- nop
- bne t0, t1, NotEq
- nop
- lbu t0, 1(a0) # unroll loop
- lbu t1, 1(a1)
- beq t0, zero, LessOrEq # end of first string?
- PTR_ADDU a0, a0, 2
- beq t0, t1, 1b
- PTR_ADDU a1, a1, 2
- NotEq:
- j ra
- PTR_SUBU v0, t0, t1
- LessOrEq:
- j ra
- PTR_SUBU v0, zero, t1
- END(strcmp)
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