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62 lines
2.4 KiB
ArmAsm
62 lines
2.4 KiB
ArmAsm
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/*-
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* Copyright (c) 1990 The Regents of the University of California.
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by the University of
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* California, Berkeley and its contributors.
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* 4. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#if defined(LIBC_SCCS) && !defined(lint)
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.asciz "@(#)memcmp.s 5.1 (Berkeley) 5/15/90"
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#endif /* LIBC_SCCS and not lint */
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/* int memcmp(s1, s2, n) */
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#include "DEFS.h"
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ENTRY(memcmp, 0)
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movl 4(ap),r1 /* r1 = s1 */
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movq 8(ap),r3 /* r3 = s2; r4 = n */
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movzwl $65535,r5
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0:
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cmpl r4,r5
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jgtru 3f /* handle stupid cmpc3 limitation */
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cmpc3 r4,(r1),(r3) /* compare */
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beql 2f /* done if same (r0 = 0) */
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1:
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movzbl (r1),r0
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movzbl (r3),r2
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subl2 r2,r0 /* return *s1 - *s2; s1,s2 unsigned chars */
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2:
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ret
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3:
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subl2 r5,r4 /* do 64K; adjust count */
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cmpc3 r5,(r1),(r3)
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jeql 0b /* loop if same */
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jbr 1b
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