[linux-2.6-block.git] / arch / arc / lib / strlen.S

/* SPDX-License-Identifier: GPL-2.0-only */
/*
 * Copyright (C) 2004, 2007-2010, 2011-2012 Synopsys, Inc. (www.synopsys.com)
 */

#include <linux/linkage.h>

ENTRY_CFI(strlen)
	or	r3,r0,7
	ld	r2,[r3,-7]
	ld.a	r6,[r3,-3]
	mov	r4,0x01010101
	; uses long immediate
#ifdef __LITTLE_ENDIAN__
	asl_s	r1,r0,3
	btst_s	r0,2
	asl	r7,r4,r1
	ror	r5,r4
	sub	r1,r2,r7
	bic_s	r1,r1,r2
	mov.eq	r7,r4
	sub	r12,r6,r7
	bic	r12,r12,r6
	or.eq	r12,r12,r1
	and	r12,r12,r5
	brne	r12,0,.Learly_end
#else /* BIG ENDIAN */
	ror	r5,r4
	btst_s	r0,2
	mov_s	r1,31
	sub3	r7,r1,r0
	sub	r1,r2,r4
	bic_s	r1,r1,r2
	bmsk	r1,r1,r7
	sub	r12,r6,r4
	bic	r12,r12,r6
	bmsk.ne	r12,r12,r7
	or.eq	r12,r12,r1
	and	r12,r12,r5
	brne	r12,0,.Learly_end
#endif /* ENDIAN */

.Loop:
	ld_s	r2,[r3,4]
	ld.a	r6,[r3,8]
	; stall for load result
	sub	r1,r2,r4
	bic_s	r1,r1,r2
	sub	r12,r6,r4
	bic	r12,r12,r6
	or	r12,r12,r1
	and	r12,r12,r5
	breq r12,0,.Loop
.Lend:
	and.f	r1,r1,r5
	sub.ne	r3,r3,4
	mov.eq	r1,r12
#ifdef __LITTLE_ENDIAN__
	sub_s	r2,r1,1
	bic_s	r2,r2,r1
	norm	r1,r2
	sub_s	r0,r0,3
	lsr_s	r1,r1,3
	sub	    r0,r3,r0
	j_s.d	[blink]
	sub	    r0,r0,r1
#else /* BIG ENDIAN */
	lsr_s	r1,r1,7
	mov.eq	r2,r6
	bic_s	r1,r1,r2
	norm	r1,r1
	sub	    r0,r3,r0
	lsr_s	r1,r1,3
	j_s.d	[blink]
	add	    r0,r0,r1
#endif /* ENDIAN */
.Learly_end:
	b.d	.Lend
	sub_s.ne r1,r1,r1
END_CFI(strlen)
Commit	Line	Data
d2912cb1	1	/* SPDX-License-Identifier: GPL-2.0-only */
5210d1e6 VG	2	/*
5210d1e6 VG	3	* Copyright (C) 2004, 2007-2010, 2011-2012 Synopsys, Inc. (www.synopsys.com)
5210d1e6 VG	4	*/
5210d1e6 VG	5
ec7ac6af	6	#include <linux/linkage.h>
5210d1e6	7
86effd0d	8	ENTRY_CFI(strlen)
5210d1e6 VG	9	or r3,r0,7
	10	ld r2,[r3,-7]
	11	ld.a r6,[r3,-3]
	12	mov r4,0x01010101
	13	; uses long immediate
	14	#ifdef __LITTLE_ENDIAN__
	15	asl_s r1,r0,3
	16	btst_s r0,2
	17	asl r7,r4,r1
	18	ror r5,r4
	19	sub r1,r2,r7
	20	bic_s r1,r1,r2
	21	mov.eq r7,r4
	22	sub r12,r6,r7
	23	bic r12,r12,r6
	24	or.eq r12,r12,r1
	25	and r12,r12,r5
	26	brne r12,0,.Learly_end
	27	#else /* BIG ENDIAN */
	28	ror r5,r4
	29	btst_s r0,2
	30	mov_s r1,31
	31	sub3 r7,r1,r0
	32	sub r1,r2,r4
	33	bic_s r1,r1,r2
	34	bmsk r1,r1,r7
	35	sub r12,r6,r4
	36	bic r12,r12,r6
	37	bmsk.ne r12,r12,r7
	38	or.eq r12,r12,r1
	39	and r12,r12,r5
	40	brne r12,0,.Learly_end
	41	#endif /* ENDIAN */
	42
	43	.Loop:
	44	ld_s r2,[r3,4]
	45	ld.a r6,[r3,8]
	46	; stall for load result
	47	sub r1,r2,r4
	48	bic_s r1,r1,r2
	49	sub r12,r6,r4
	50	bic r12,r12,r6
	51	or r12,r12,r1
	52	and r12,r12,r5
	53	breq r12,0,.Loop
	54	.Lend:
	55	and.f r1,r1,r5
	56	sub.ne r3,r3,4
	57	mov.eq r1,r12
	58	#ifdef __LITTLE_ENDIAN__
	59	sub_s r2,r1,1
	60	bic_s r2,r2,r1
	61	norm r1,r2
	62	sub_s r0,r0,3
	63	lsr_s r1,r1,3
	64	sub r0,r3,r0
	65	j_s.d [blink]
	66	sub r0,r0,r1
	67	#else /* BIG ENDIAN */
	68	lsr_s r1,r1,7
	69	mov.eq r2,r6
	70	bic_s r1,r1,r2
	71	norm r1,r1
	72	sub r0,r3,r0
73	lsr_s r1,r1,3
74	j_s.d [blink]
75	add r0,r0,r1
76	#endif /* ENDIAN */
77	.Learly_end:
78	b.d .Lend
79	sub_s.ne r1,r1,r1
86effd0d	80	END_CFI(strlen)