48 lines
1.6 KiB
ArmAsm
48 lines
1.6 KiB
ArmAsm
/*-
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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 are permitted
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* provided that: (1) source distributions retain this entire copyright
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* notice and comment, and (2) distributions including binaries display
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* the following acknowledgement: ``This product includes software
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* developed by the University of California, Berkeley and its contributors''
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* in the documentation or other materials provided with the distribution
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* and in all advertising materials mentioning features or use of this
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* software. Neither the name of the University nor the names of its
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* contributors may be used to endorse or promote products derived
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* from this software without specific prior written permission.
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* THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR
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* IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED
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* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
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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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