1/* SPDX-License-Identifier: GPL-2.0 */
 2/* strlen.S: Sparc optimized strlen code
 3 * Hand optimized from GNU libc's strlen
 4 * Copyright (C) 1991,1996 Free Software Foundation
 5 * Copyright (C) 1996,2008 David S. Miller (davem@davemloft.net)
 6 * Copyright (C) 1996, 1997 Jakub Jelinek (jj@sunsite.mff.cuni.cz)
 7 */
 8
 9#include <linux/linkage.h>
10#include <asm/asm.h>
11#include <asm/export.h>
12
13#define LO_MAGIC 0x01010101
14#define HI_MAGIC 0x80808080
15
16	.text
17ENTRY(strlen)
18	mov	%o0, %o1
19	andcc	%o0, 3, %g0
20	BRANCH32(be, pt, 9f)
21	 sethi	%hi(HI_MAGIC), %o4
22	ldub	[%o0], %o5
23	BRANCH_REG_ZERO(pn, %o5, 11f)
24	 add	%o0, 1, %o0
25	andcc	%o0, 3, %g0
26	BRANCH32(be, pn, 4f)
27	 or	%o4, %lo(HI_MAGIC), %o3
28	ldub	[%o0], %o5
29	BRANCH_REG_ZERO(pn, %o5, 12f)
30	 add	%o0, 1, %o0
31	andcc	%o0, 3, %g0
32	BRANCH32(be, pt, 5f)
33	 sethi	%hi(LO_MAGIC), %o4
34	ldub	[%o0], %o5
35	BRANCH_REG_ZERO(pn, %o5, 13f)
36	 add	%o0, 1, %o0
37	BRANCH32(ba, pt, 8f)
38	 or	%o4, %lo(LO_MAGIC), %o2
399:
40	or	%o4, %lo(HI_MAGIC), %o3
414:
42	sethi	%hi(LO_MAGIC), %o4
435:
44	or	%o4, %lo(LO_MAGIC), %o2
458:
46	ld	[%o0], %o5
472:
48	sub	%o5, %o2, %o4
49	andcc	%o4, %o3, %g0
50	BRANCH32(be, pt, 8b)
51	 add	%o0, 4, %o0
52
53	/* Check every byte. */
54	srl	%o5, 24, %g7
55	andcc	%g7, 0xff, %g0
56	BRANCH32(be, pn, 1f)
57	 add	%o0, -4, %o4
58	srl	%o5, 16, %g7
59	andcc	%g7, 0xff, %g0
60	BRANCH32(be, pn, 1f)
61	 add	%o4, 1, %o4
62	srl	%o5, 8, %g7
63	andcc	%g7, 0xff, %g0
64	BRANCH32(be, pn, 1f)
65	 add	%o4, 1, %o4
66	andcc	%o5, 0xff, %g0
67	BRANCH32_ANNUL(bne, pt, 2b)
68	 ld	[%o0], %o5
69	add	%o4, 1, %o4
701:
71	retl
72	 sub	%o4, %o1, %o0
7311:
74	retl
75	 mov	0, %o0
7612:
77	retl
78	 mov	1, %o0
7913:
80	retl
81	 mov	2, %o0
82ENDPROC(strlen)
83EXPORT_SYMBOL(strlen)

 
 1/* strlen.S: Sparc optimized strlen code
 2 * Hand optimized from GNU libc's strlen
 3 * Copyright (C) 1991,1996 Free Software Foundation
 4 * Copyright (C) 1996,2008 David S. Miller (davem@davemloft.net)
 5 * Copyright (C) 1996, 1997 Jakub Jelinek (jj@sunsite.mff.cuni.cz)
 6 */
 7
 8#include <linux/linkage.h>
 9#include <asm/asm.h>
10#include <asm/export.h>
11
12#define LO_MAGIC 0x01010101
13#define HI_MAGIC 0x80808080
14
15	.text
16ENTRY(strlen)
17	mov	%o0, %o1
18	andcc	%o0, 3, %g0
19	BRANCH32(be, pt, 9f)
20	 sethi	%hi(HI_MAGIC), %o4
21	ldub	[%o0], %o5
22	BRANCH_REG_ZERO(pn, %o5, 11f)
23	 add	%o0, 1, %o0
24	andcc	%o0, 3, %g0
25	BRANCH32(be, pn, 4f)
26	 or	%o4, %lo(HI_MAGIC), %o3
27	ldub	[%o0], %o5
28	BRANCH_REG_ZERO(pn, %o5, 12f)
29	 add	%o0, 1, %o0
30	andcc	%o0, 3, %g0
31	BRANCH32(be, pt, 5f)
32	 sethi	%hi(LO_MAGIC), %o4
33	ldub	[%o0], %o5
34	BRANCH_REG_ZERO(pn, %o5, 13f)
35	 add	%o0, 1, %o0
36	BRANCH32(ba, pt, 8f)
37	 or	%o4, %lo(LO_MAGIC), %o2
389:
39	or	%o4, %lo(HI_MAGIC), %o3
404:
41	sethi	%hi(LO_MAGIC), %o4
425:
43	or	%o4, %lo(LO_MAGIC), %o2
448:
45	ld	[%o0], %o5
462:
47	sub	%o5, %o2, %o4
48	andcc	%o4, %o3, %g0
49	BRANCH32(be, pt, 8b)
50	 add	%o0, 4, %o0
51
52	/* Check every byte. */
53	srl	%o5, 24, %g7
54	andcc	%g7, 0xff, %g0
55	BRANCH32(be, pn, 1f)
56	 add	%o0, -4, %o4
57	srl	%o5, 16, %g7
58	andcc	%g7, 0xff, %g0
59	BRANCH32(be, pn, 1f)
60	 add	%o4, 1, %o4
61	srl	%o5, 8, %g7
62	andcc	%g7, 0xff, %g0
63	BRANCH32(be, pn, 1f)
64	 add	%o4, 1, %o4
65	andcc	%o5, 0xff, %g0
66	BRANCH32_ANNUL(bne, pt, 2b)
67	 ld	[%o0], %o5
68	add	%o4, 1, %o4
691:
70	retl
71	 sub	%o4, %o1, %o0
7211:
73	retl
74	 mov	0, %o0
7512:
76	retl
77	 mov	1, %o0
7813:
79	retl
80	 mov	2, %o0
81ENDPROC(strlen)
82EXPORT_SYMBOL(strlen)