diff options
Diffstat (limited to 'arch/arc/lib/memcmp.S')
| -rw-r--r-- | arch/arc/lib/memcmp.S | 124 |
1 files changed, 124 insertions, 0 deletions
diff --git a/arch/arc/lib/memcmp.S b/arch/arc/lib/memcmp.S new file mode 100644 index 000000000000..bc813d55b6c3 --- /dev/null +++ b/arch/arc/lib/memcmp.S | |||
| @@ -0,0 +1,124 @@ | |||
| 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 | |||
| 9 | #include <asm/linkage.h> | ||
| 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 | |||
| 19 | ARC_ENTRY memcmp | ||
| 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 | ||
| 27 | lpne .Loop_end | ||
| 28 | ld_s WORD2,[r0,4] | ||
| 29 | ld_s r12,[r1,4] | ||
| 30 | brne r4,r5,.Leven | ||
| 31 | ld.a r4,[r0,8] | ||
| 32 | ld.a r5,[r1,8] | ||
| 33 | brne WORD2,r12,.Lodd | ||
| 34 | .Loop_end: | ||
| 35 | asl_s SHIFT,SHIFT,3 | ||
| 36 | bhs_s .Last_cmp | ||
| 37 | brne r4,r5,.Leven | ||
| 38 | ld r4,[r0,4] | ||
| 39 | ld r5,[r1,4] | ||
| 40 | #ifdef __LITTLE_ENDIAN__ | ||
| 41 | nop_s | ||
| 42 | ; one more load latency cycle | ||
| 43 | .Last_cmp: | ||
| 44 | xor r0,r4,r5 | ||
| 45 | bset r0,r0,SHIFT | ||
| 46 | sub_s r1,r0,1 | ||
| 47 | bic_s r1,r1,r0 | ||
| 48 | norm r1,r1 | ||
| 49 | b.d .Leven_cmp | ||
| 50 | and r1,r1,24 | ||
| 51 | .Leven: | ||
| 52 | xor r0,r4,r5 | ||
| 53 | sub_s r1,r0,1 | ||
| 54 | bic_s r1,r1,r0 | ||
| 55 | norm r1,r1 | ||
| 56 | ; slow track insn | ||
| 57 | and r1,r1,24 | ||
| 58 | .Leven_cmp: | ||
| 59 | asl r2,r4,r1 | ||
| 60 | asl r12,r5,r1 | ||
| 61 | lsr_s r2,r2,1 | ||
| 62 | lsr_s r12,r12,1 | ||
| 63 | j_s.d [blink] | ||
| 64 | sub r0,r2,r12 | ||
| 65 | .balign 4 | ||
| 66 | .Lodd: | ||
| 67 | xor r0,WORD2,r12 | ||
| 68 | sub_s r1,r0,1 | ||
| 69 | bic_s r1,r1,r0 | ||
| 70 | norm r1,r1 | ||
| 71 | ; slow track insn | ||
| 72 | and r1,r1,24 | ||
| 73 | asl_s r2,r2,r1 | ||
| 74 | asl_s r12,r12,r1 | ||
| 75 | lsr_s r2,r2,1 | ||
| 76 | lsr_s r12,r12,1 | ||
| 77 | j_s.d [blink] | ||
| 78 | sub r0,r2,r12 | ||
| 79 | #else /* BIG ENDIAN */ | ||
| 80 | .Last_cmp: | ||
| 81 | neg_s SHIFT,SHIFT | ||
| 82 | lsr r4,r4,SHIFT | ||
| 83 | lsr r5,r5,SHIFT | ||
| 84 | ; slow track insn | ||
| 85 | .Leven: | ||
| 86 | sub.f r0,r4,r5 | ||
| 87 | mov.ne r0,1 | ||
| 88 | j_s.d [blink] | ||
| 89 | bset.cs r0,r0,31 | ||
| 90 | .Lodd: | ||
| 91 | cmp_s WORD2,r12 | ||
| 92 | |||
| 93 | mov_s r0,1 | ||
| 94 | j_s.d [blink] | ||
| 95 | bset.cs r0,r0,31 | ||
| 96 | #endif /* ENDIAN */ | ||
| 97 | .balign 4 | ||
| 98 | .Lbytewise: | ||
| 99 | breq r2,0,.Lnil | ||
| 100 | ldb r4,[r0,0] | ||
| 101 | ldb r5,[r1,0] | ||
| 102 | lsr.f lp_count,r3 | ||
| 103 | lpne .Lbyte_end | ||
| 104 | ldb_s r3,[r0,1] | ||
| 105 | ldb r12,[r1,1] | ||
| 106 | brne r4,r5,.Lbyte_even | ||
| 107 | ldb.a r4,[r0,2] | ||
| 108 | ldb.a r5,[r1,2] | ||
| 109 | brne r3,r12,.Lbyte_odd | ||
| 110 | .Lbyte_end: | ||
| 111 | bcc .Lbyte_even | ||
| 112 | brne r4,r5,.Lbyte_even | ||
| 113 | ldb_s r3,[r0,1] | ||
| 114 | ldb_s r12,[r1,1] | ||
| 115 | .Lbyte_odd: | ||
| 116 | j_s.d [blink] | ||
| 117 | sub r0,r3,r12 | ||
| 118 | .Lbyte_even: | ||
| 119 | j_s.d [blink] | ||
| 120 | sub r0,r4,r5 | ||
| 121 | .Lnil: | ||
| 122 | j_s.d [blink] | ||
| 123 | mov r0,0 | ||
| 124 | ARC_EXIT memcmp | ||