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gerrit-public.fairphone.software / kernel / msm-4.9 / 9a2885e662bcbdcbc473f207b481c65b8620537b / . / arch / arc / lib / memcmp.S
blob: a4015e7d9ab7aa6862b41ab6138b7d64c715693e [file] [log] [blame]
Vineet Gupta5210d1e2013-01-18 15:12:18 +0530[diff] [blame]1/*
2 * Copyright (C) 2004, 2007-2010, 2011-2012 Synopsys, Inc. (www.synopsys.com)
3 *
4 * This program is free software; you can redistribute it and/or modify
5 * it under the terms of the GNU General Public License version 2 as
6 * published by the Free Software Foundation.
7 */
8
Vineet Guptaec7ac6a2014-02-07 13:47:43 +0530[diff] [blame]9#include <linux/linkage.h>
Vineet Gupta5210d1e2013-01-18 15:12:18 +0530[diff] [blame]10
11#ifdef __LITTLE_ENDIAN__
12#define WORD2 r2
13#define SHIFT r3
14#else /* BIG ENDIAN */
15#define WORD2 r3
16#define SHIFT r2
17#endif
18
Vineet Guptaec7ac6a2014-02-07 13:47:43 +0530[diff] [blame]19ENTRY(memcmp)
Vineet Gupta5210d1e2013-01-18 15:12:18 +0530[diff] [blame]20 or r12,r0,r1
21 asl_s r12,r12,30
22 sub r3,r2,1
23 brls r2,r12,.Lbytewise
24 ld r4,[r0,0]
25 ld r5,[r1,0]
26 lsr.f lp_count,r3,3
Vineet Gupta8922bc32013-10-07 18:10:08 +0530[diff] [blame]27#ifdef CONFIG_ISA_ARCV2
28 /* In ARCv2 a branch can't be the last instruction in a zero overhead
29 * loop.
30 * So we move the branch to the start of the loop, duplicate it
31 * after the end, and set up r12 so that the branch isn't taken
32 * initially.
33 */
34 mov_s r12,WORD2
35 lpne .Loop_end
36 brne WORD2,r12,.Lodd
37 ld WORD2,[r0,4]
38#else
Vineet Gupta5210d1e2013-01-18 15:12:18 +0530[diff] [blame]39 lpne .Loop_end
40 ld_s WORD2,[r0,4]
Vineet Gupta8922bc32013-10-07 18:10:08 +0530[diff] [blame]41#endif
Vineet Gupta5210d1e2013-01-18 15:12:18 +0530[diff] [blame]42 ld_s r12,[r1,4]
43 brne r4,r5,.Leven
44 ld.a r4,[r0,8]
45 ld.a r5,[r1,8]
Vineet Gupta8922bc32013-10-07 18:10:08 +0530[diff] [blame]46#ifdef CONFIG_ISA_ARCV2
47.Loop_end:
48 brne WORD2,r12,.Lodd
49#else
Vineet Gupta5210d1e2013-01-18 15:12:18 +0530[diff] [blame]50 brne WORD2,r12,.Lodd
51.Loop_end:
Vineet Gupta8922bc32013-10-07 18:10:08 +0530[diff] [blame]52#endif
Vineet Gupta5210d1e2013-01-18 15:12:18 +0530[diff] [blame]53 asl_s SHIFT,SHIFT,3
54 bhs_s .Last_cmp
55 brne r4,r5,.Leven
56 ld r4,[r0,4]
57 ld r5,[r1,4]
58#ifdef __LITTLE_ENDIAN__
59 nop_s
60 ; one more load latency cycle
61.Last_cmp:
62 xor r0,r4,r5
63 bset r0,r0,SHIFT
64 sub_s r1,r0,1
65 bic_s r1,r1,r0
66 norm r1,r1
67 b.d .Leven_cmp
68 and r1,r1,24
69.Leven:
70 xor r0,r4,r5
71 sub_s r1,r0,1
72 bic_s r1,r1,r0
73 norm r1,r1
74 ; slow track insn
75 and r1,r1,24
76.Leven_cmp:
77 asl r2,r4,r1
78 asl r12,r5,r1
79 lsr_s r2,r2,1
80 lsr_s r12,r12,1
81 j_s.d [blink]
82 sub r0,r2,r12
83 .balign 4
84.Lodd:
85 xor r0,WORD2,r12
86 sub_s r1,r0,1
87 bic_s r1,r1,r0
88 norm r1,r1
89 ; slow track insn
90 and r1,r1,24
91 asl_s r2,r2,r1
92 asl_s r12,r12,r1
93 lsr_s r2,r2,1
94 lsr_s r12,r12,1
95 j_s.d [blink]
96 sub r0,r2,r12
97#else /* BIG ENDIAN */
98.Last_cmp:
99 neg_s SHIFT,SHIFT
100 lsr r4,r4,SHIFT
101 lsr r5,r5,SHIFT
102 ; slow track insn
103.Leven:
104 sub.f r0,r4,r5
105 mov.ne r0,1
106 j_s.d [blink]
107 bset.cs r0,r0,31
108.Lodd:
109 cmp_s WORD2,r12
Vineet Gupta5210d1e2013-01-18 15:12:18 +0530[diff] [blame]110 mov_s r0,1
111 j_s.d [blink]
112 bset.cs r0,r0,31
113#endif /* ENDIAN */
114 .balign 4
115.Lbytewise:
116 breq r2,0,.Lnil
117 ldb r4,[r0,0]
118 ldb r5,[r1,0]
119 lsr.f lp_count,r3
Vineet Gupta8922bc32013-10-07 18:10:08 +0530[diff] [blame]120#ifdef CONFIG_ISA_ARCV2
121 mov r12,r3
Vineet Gupta5210d1e2013-01-18 15:12:18 +0530[diff] [blame]122 lpne .Lbyte_end
Vineet Gupta8922bc32013-10-07 18:10:08 +0530[diff] [blame]123 brne r3,r12,.Lbyte_odd
124#else
125 lpne .Lbyte_end
126#endif
Vineet Gupta5210d1e2013-01-18 15:12:18 +0530[diff] [blame]127 ldb_s r3,[r0,1]
128 ldb r12,[r1,1]
129 brne r4,r5,.Lbyte_even
130 ldb.a r4,[r0,2]
131 ldb.a r5,[r1,2]
Vineet Gupta8922bc32013-10-07 18:10:08 +0530[diff] [blame]132#ifdef CONFIG_ISA_ARCV2
133.Lbyte_end:
134 brne r3,r12,.Lbyte_odd
135#else
Vineet Gupta5210d1e2013-01-18 15:12:18 +0530[diff] [blame]136 brne r3,r12,.Lbyte_odd
137.Lbyte_end:
Vineet Gupta8922bc32013-10-07 18:10:08 +0530[diff] [blame]138#endif
Vineet Gupta5210d1e2013-01-18 15:12:18 +0530[diff] [blame]139 bcc .Lbyte_even
140 brne r4,r5,.Lbyte_even
141 ldb_s r3,[r0,1]
142 ldb_s r12,[r1,1]
143.Lbyte_odd:
144 j_s.d [blink]
145 sub r0,r3,r12
146.Lbyte_even:
147 j_s.d [blink]
148 sub r0,r4,r5
149.Lnil:
150 j_s.d [blink]
151 mov r0,0
Vineet Guptaec7ac6a2014-02-07 13:47:43 +0530[diff] [blame]152END(memcmp)