| Claudiu Zissulescu | 1f7e3dc | 2014-11-21 13:39:25 +0530 | [diff] [blame] | 1 | /* |
| 2 | * Copyright (C) 2014-15 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 <linux/linkage.h> |
| 10 | |
| 11 | ENTRY(strcmp) |
| 12 | or r2, r0, r1 |
| 13 | bmsk_s r2, r2, 1 |
| 14 | brne r2, 0, @.Lcharloop |
| 15 | |
| 16 | ;;; s1 and s2 are word aligned |
| 17 | ld.ab r2, [r0, 4] |
| 18 | |
| 19 | mov_s r12, 0x01010101 |
| 20 | ror r11, r12 |
| 21 | .align 4 |
| 22 | .LwordLoop: |
| 23 | ld.ab r3, [r1, 4] |
| 24 | ;; Detect NULL char in str1 |
| 25 | sub r4, r2, r12 |
| 26 | ld.ab r5, [r0, 4] |
| 27 | bic r4, r4, r2 |
| 28 | and r4, r4, r11 |
| 29 | brne.d.nt r4, 0, .LfoundNULL |
| 30 | ;; Check if the read locations are the same |
| 31 | cmp r2, r3 |
| 32 | beq.d .LwordLoop |
| 33 | mov.eq r2, r5 |
| 34 | |
| 35 | ;; A match is found, spot it out |
| 36 | #ifdef __LITTLE_ENDIAN__ |
| 37 | swape r3, r3 |
| 38 | mov_s r0, 1 |
| 39 | swape r2, r2 |
| 40 | #else |
| 41 | mov_s r0, 1 |
| 42 | #endif |
| 43 | cmp_s r2, r3 |
| 44 | j_s.d [blink] |
| 45 | bset.lo r0, r0, 31 |
| 46 | |
| 47 | .align 4 |
| 48 | .LfoundNULL: |
| 49 | #ifdef __BIG_ENDIAN__ |
| 50 | swape r4, r4 |
| 51 | swape r2, r2 |
| 52 | swape r3, r3 |
| 53 | #endif |
| 54 | ;; Find null byte |
| 55 | ffs r0, r4 |
| 56 | bmsk r2, r2, r0 |
| 57 | bmsk r3, r3, r0 |
| 58 | swape r2, r2 |
| 59 | swape r3, r3 |
| 60 | ;; make the return value |
| 61 | sub.f r0, r2, r3 |
| 62 | mov.hi r0, 1 |
| 63 | j_s.d [blink] |
| 64 | bset.lo r0, r0, 31 |
| 65 | |
| 66 | .align 4 |
| 67 | .Lcharloop: |
| 68 | ldb.ab r2, [r0, 1] |
| 69 | ldb.ab r3, [r1, 1] |
| 70 | nop |
| 71 | breq r2, 0, .Lcmpend |
| 72 | breq r2, r3, .Lcharloop |
| 73 | |
| 74 | .align 4 |
| 75 | .Lcmpend: |
| 76 | j_s.d [blink] |
| 77 | sub r0, r2, r3 |
| 78 | END(strcmp) |