strcmp.S
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/*
* Copyright 2005-2010 Analog Devices Inc.
*
* Licensed under the Clear BSD license or the GPL-2 (or later)
*/
#include <linux/linkage.h>
/* void *strcmp(char *s1, const char *s2);
* R0 = address (s1)
* R1 = address (s2)
*
* Returns an integer less than, equal to, or greater than zero if s1
* (or the first n bytes thereof) is found, respectively, to be less
* than, to match, or be greater than s2.
*/
#ifdef CONFIG_STRCMP_L1
.section .l1.text
#else
.text
#endif
.align 2
ENTRY(_strcmp)
P0 = R0 ; /* s1 */
P1 = R1 ; /* s2 */
1:
R0 = B[P0++] (Z); /* get *s1 */
R1 = B[P1++] (Z); /* get *s2 */
CC = R0 == R1; /* compare a byte */
if ! cc jump 2f; /* not equal, break out */
CC = R0; /* at end of s1? */
if cc jump 1b (bp); /* no, keep going */
jump.s 3f; /* strings are equal */
2:
R0 = R0 - R1; /* *s1 - *s2 */
3:
RTS;
ENDPROC(_strcmp)