| Vineet Gupta | 5210d1e | 2013-01-18 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 | |
| 9 | #include <asm/linkage.h> |
| 10 | |
| 11 | ARC_ENTRY strlen |
| 12 | or r3,r0,7 |
| 13 | ld r2,[r3,-7] |
| 14 | ld.a r6,[r3,-3] |
| 15 | mov r4,0x01010101 |
| 16 | ; uses long immediate |
| 17 | #ifdef __LITTLE_ENDIAN__ |
| 18 | asl_s r1,r0,3 |
| 19 | btst_s r0,2 |
| 20 | asl r7,r4,r1 |
| 21 | ror r5,r4 |
| 22 | sub r1,r2,r7 |
| 23 | bic_s r1,r1,r2 |
| 24 | mov.eq r7,r4 |
| 25 | sub r12,r6,r7 |
| 26 | bic r12,r12,r6 |
| 27 | or.eq r12,r12,r1 |
| 28 | and r12,r12,r5 |
| 29 | brne r12,0,.Learly_end |
| 30 | #else /* BIG ENDIAN */ |
| 31 | ror r5,r4 |
| 32 | btst_s r0,2 |
| 33 | mov_s r1,31 |
| 34 | sub3 r7,r1,r0 |
| 35 | sub r1,r2,r4 |
| 36 | bic_s r1,r1,r2 |
| 37 | bmsk r1,r1,r7 |
| 38 | sub r12,r6,r4 |
| 39 | bic r12,r12,r6 |
| 40 | bmsk.ne r12,r12,r7 |
| 41 | or.eq r12,r12,r1 |
| 42 | and r12,r12,r5 |
| 43 | brne r12,0,.Learly_end |
| 44 | #endif /* ENDIAN */ |
| 45 | |
| 46 | .Loop: |
| 47 | ld_s r2,[r3,4] |
| 48 | ld.a r6,[r3,8] |
| 49 | ; stall for load result |
| 50 | sub r1,r2,r4 |
| 51 | bic_s r1,r1,r2 |
| 52 | sub r12,r6,r4 |
| 53 | bic r12,r12,r6 |
| 54 | or r12,r12,r1 |
| 55 | and r12,r12,r5 |
| 56 | breq r12,0,.Loop |
| 57 | .Lend: |
| 58 | and.f r1,r1,r5 |
| 59 | sub.ne r3,r3,4 |
| 60 | mov.eq r1,r12 |
| 61 | #ifdef __LITTLE_ENDIAN__ |
| 62 | sub_s r2,r1,1 |
| 63 | bic_s r2,r2,r1 |
| 64 | norm r1,r2 |
| 65 | sub_s r0,r0,3 |
| 66 | lsr_s r1,r1,3 |
| 67 | sub r0,r3,r0 |
| 68 | j_s.d [blink] |
| 69 | sub r0,r0,r1 |
| 70 | #else /* BIG ENDIAN */ |
| 71 | lsr_s r1,r1,7 |
| 72 | mov.eq r2,r6 |
| 73 | bic_s r1,r1,r2 |
| 74 | norm r1,r1 |
| 75 | sub r0,r3,r0 |
| 76 | lsr_s r1,r1,3 |
| 77 | j_s.d [blink] |
| 78 | add r0,r0,r1 |
| 79 | #endif /* ENDIAN */ |
| 80 | .Learly_end: |
| 81 | b.d .Lend |
| 82 | sub_s.ne r1,r1,r1 |
| 83 | ARC_EXIT strlen |