| lh | 9ed821d | 2023-04-07 01:36:19 -0700 | [diff] [blame] | 1 | /* |
| 2 | * Copyright (C) 2004-2007 Atmel Corporation |
| 3 | * |
| 4 | * This file is subject to the terms and conditions of the GNU Lesser General |
| 5 | * Public License. See the file "COPYING.LIB" in the main directory of this |
| 6 | * archive for more details. |
| 7 | */ |
| 8 | |
| 9 | #include <features.h> |
| 10 | |
| 11 | #define s1 r12 |
| 12 | #define s2 r11 |
| 13 | #define len r10 |
| 14 | |
| 15 | .text |
| 16 | .global strcmp |
| 17 | .type strcmp, @function |
| 18 | .align 1 |
| 19 | strcmp: |
| 20 | mov r8, 3 |
| 21 | tst s1, r8 |
| 22 | brne .Lunaligned_s1 |
| 23 | tst s2, r8 |
| 24 | brne .Lunaligned_s2 |
| 25 | |
| 26 | 1: ld.w r8, s1++ |
| 27 | ld.w r9, s2++ |
| 28 | cp.w r8, r9 |
| 29 | brne 2f |
| 30 | tnbz r8 |
| 31 | brne 1b |
| 32 | retal 0 |
| 33 | |
| 34 | 2: bfextu r12, r8, 24, 8 |
| 35 | bfextu r11, r9, 24, 8 |
| 36 | sub r12, r11 |
| 37 | retne r12 |
| 38 | cp.w r11, 0 |
| 39 | reteq 0 |
| 40 | bfextu r12, r8, 16, 8 |
| 41 | bfextu r11, r9, 16, 8 |
| 42 | sub r12, r11 |
| 43 | retne r12 |
| 44 | cp.w r11, 0 |
| 45 | reteq 0 |
| 46 | bfextu r12, r8, 8, 8 |
| 47 | bfextu r11, r9, 8, 8 |
| 48 | sub r12, r11 |
| 49 | retne r12 |
| 50 | cp.w r11, 0 |
| 51 | reteq 0 |
| 52 | bfextu r12, r8, 0, 8 |
| 53 | bfextu r11, r9, 0, 8 |
| 54 | sub r12, r11 |
| 55 | retal r12 |
| 56 | |
| 57 | .Lunaligned_s1: |
| 58 | 3: tst s1, r8 |
| 59 | breq 4f |
| 60 | ld.ub r10, s1++ |
| 61 | ld.ub r9, s2++ |
| 62 | sub r10, r9 |
| 63 | retne r10 |
| 64 | cp.w r9, 0 |
| 65 | brne 3b |
| 66 | retal r10 |
| 67 | |
| 68 | 4: tst s2, r8 |
| 69 | breq 1b |
| 70 | |
| 71 | .Lunaligned_s2: |
| 72 | /* |
| 73 | * s1 and s2 can't both be aligned, and unaligned word loads |
| 74 | * can trigger spurious exceptions if we cross a page boundary. |
| 75 | * Do it the slow way... |
| 76 | */ |
| 77 | 1: ld.ub r8, s1++ |
| 78 | ld.ub r9, s2++ |
| 79 | sub r8, r9 |
| 80 | retne r8 |
| 81 | cp.w r9, 0 |
| 82 | brne 1b |
| 83 | retal 0 |
| 84 | |
| 85 | .size strcmp, . - strcmp |
| 86 | |
| 87 | libc_hidden_def(strcmp) |
| 88 | #ifndef __UCLIBC_HAS_LOCALE__ |
| 89 | strong_alias(strcmp, strcoll) |
| 90 | libc_hidden_def(strcoll) |
| 91 | #endif |