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1 | /* |
2 | * Copyright 2004-2009 Analog Devices Inc. |
3 | * |
4 | * Licensed under the ADI BSD license or the GPL-2 (or later) |
5 | */ |
6 | |
7 | #include <linux/linkage.h> |
8 | |
9 | /* int memcmp(const void *s1, const void *s2, size_t n); |
10 | * R0 = First Address (s1) |
11 | * R1 = Second Address (s2) |
12 | * R2 = count (n) |
13 | * |
14 | * Favours word aligned data. |
15 | */ |
16 | |
17 | .text |
18 | |
19 | .align 2 |
20 | |
21 | ENTRY(_memcmp) |
22 | I1 = P3; |
23 | P0 = R0; /* P0 = s1 address */ |
24 | P3 = R1; /* P3 = s2 Address */ |
25 | P2 = R2 ; /* P2 = count */ |
26 | CC = R2 <= 7(IU); |
27 | IF CC JUMP .Ltoo_small; |
28 | I0 = R1; /* s2 */ |
29 | R1 = R1 | R0; /* OR addresses together */ |
30 | R1 <<= 30; /* check bottom two bits */ |
31 | CC = AZ; /* AZ set if zero. */ |
32 | IF !CC JUMP .Lbytes ; /* Jump if addrs not aligned. */ |
33 | |
34 | P1 = P2 >> 2; /* count = n/4 */ |
35 | R3 = 3; |
36 | R2 = R2 & R3; /* remainder */ |
37 | P2 = R2; /* set remainder */ |
38 | |
39 | LSETUP (.Lquad_loop_s, .Lquad_loop_e) LC0=P1; |
40 | .Lquad_loop_s: |
41 | #if ANOMALY_05000202 |
42 | R0 = [P0++]; |
43 | R1 = [I0++]; |
44 | #else |
45 | MNOP || R0 = [P0++] || R1 = [I0++]; |
46 | #endif |
47 | CC = R0 == R1; |
48 | IF !CC JUMP .Lquad_different; |
49 | .Lquad_loop_e: |
50 | NOP; |
51 | |
52 | P3 = I0; /* s2 */ |
53 | .Ltoo_small: |
54 | CC = P2 == 0; /* Check zero count*/ |
55 | IF CC JUMP .Lfinished; /* very unlikely*/ |
56 | |
57 | .Lbytes: |
58 | LSETUP (.Lbyte_loop_s, .Lbyte_loop_e) LC0=P2; |
59 | .Lbyte_loop_s: |
60 | R1 = B[P3++](Z); /* *s2 */ |
61 | R0 = B[P0++](Z); /* *s1 */ |
62 | CC = R0 == R1; |
63 | IF !CC JUMP .Ldifferent; |
64 | .Lbyte_loop_e: |
65 | NOP; |
66 | |
67 | .Ldifferent: |
68 | R0 = R0 - R1; |
69 | P3 = I1; |
70 | RTS; |
71 | |
72 | .Lquad_different: |
73 | /* We've read two quads which don't match. |
74 | * Can't just compare them, because we're |
75 | * a little-endian machine, so the MSBs of |
76 | * the regs occur at later addresses in the |
77 | * string. |
78 | * Arrange to re-read those two quads again, |
79 | * byte-by-byte. |
80 | */ |
81 | P0 += -4; /* back up to the start of the */ |
82 | P3 = I0; /* quads, and increase the*/ |
83 | P2 += 4; /* remainder count*/ |
84 | P3 += -4; |
85 | JUMP .Lbytes; |
86 | |
87 | .Lfinished: |
88 | R0 = 0; |
89 | P3 = I1; |
90 | RTS; |
91 | |
92 | ENDPROC(_memcmp) |
93 |
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v2.6.34-rc5
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v3.9