[deliverable/linux.git] / arch / blackfin / lib / memchr.S

/*
 * Copyright 2005-2009 Analog Devices Inc.
 *
 * Licensed under the Clear BSD license or the GPL-2 (or later)
 */

#include <linux/linkage.h>

/* void *memchr(const void *s, int c, size_t n);
 * R0 = address (s)
 * R1 = sought byte (c)
 * R2 = count (n)
 *
 * Returns pointer to located character.
 */

.text

.align 2

ENTRY(_memchr)
	P0 = R0;		/* P0 = address */
	P2 = R2;		/* P2 = count */
	R1 = R1.B(Z);
	CC = R2 == 0;
	IF CC JUMP .Lfailed;

.Lbytes:
	LSETUP (.Lbyte_loop_s, .Lbyte_loop_e) LC0=P2;

.Lbyte_loop_s:
	R3 = B[P0++](Z);
	CC = R3 == R1;
	IF CC JUMP .Lfound;
.Lbyte_loop_e:
	NOP;

.Lfailed:
	R0=0;
	RTS;

.Lfound:
	R0 = P0;
	R0 += -1;
	RTS;

ENDPROC(_memchr)
Commit	Line	Data
1394f032	1	/*
96f1050d	2	* Copyright 2005-2009 Analog Devices Inc.
1394f032	3	*
de450838	4	* Licensed under the Clear BSD license or the GPL-2 (or later)
1394f032 BW	5	*/
	6
	7	#include <linux/linkage.h>
	8
	9	/* void memchr(const void s, int c, size_t n);
	10	* R0 = address (s)
	11	* R1 = sought byte (c)
	12	* R2 = count (n)
	13	*
	14	* Returns pointer to located character.
	15	*/
	16
	17	.text
	18
	19	.align 2
	20
	21	ENTRY(_memchr)
	22	P0 = R0; /* P0 = address */
	23	P2 = R2; /* P2 = count */
	24	R1 = R1.B(Z);
	25	CC = R2 == 0;
	26	IF CC JUMP .Lfailed;
	27
	28	.Lbytes:
	29	LSETUP (.Lbyte_loop_s, .Lbyte_loop_e) LC0=P2;
	30
	31	.Lbyte_loop_s:
	32	R3 = B[P0++](Z);
	33	CC = R3 == R1;
	34	IF CC JUMP .Lfound;
	35	.Lbyte_loop_e:
	36	NOP;
	37
	38	.Lfailed:
	39	R0=0;
	40	RTS;
	41
	42	.Lfound:
	43	R0 = P0;
	44	R0 += -1;
	45	RTS;
	46
51be24c3	47	ENDPROC(_memchr)