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 str r12 |
| 12 | |
| 13 | .text |
| 14 | .global strlen |
| 15 | .type strlen, @function |
| 16 | strlen: |
| 17 | mov r11, r12 |
| 18 | |
| 19 | mov r9, str |
| 20 | andl r9, 3, COH |
| 21 | brne .Lunaligned_str |
| 22 | |
| 23 | 1: ld.w r8, str++ |
| 24 | tnbz r8 |
| 25 | brne 1b |
| 26 | |
| 27 | sub r12, r11 |
| 28 | bfextu r9, r8, 24, 8 |
| 29 | cp.w r9, 0 |
| 30 | subeq r12, 4 |
| 31 | reteq r12 |
| 32 | bfextu r9, r8, 16, 8 |
| 33 | cp.w r9, 0 |
| 34 | subeq r12, 3 |
| 35 | reteq r12 |
| 36 | bfextu r9, r8, 8, 8 |
| 37 | cp.w r9, 0 |
| 38 | subeq r12, 2 |
| 39 | reteq r12 |
| 40 | sub r12, 1 |
| 41 | retal r12 |
| 42 | |
| 43 | .Lunaligned_str: |
| 44 | add pc, pc, r9 << 3 |
| 45 | sub r0, r0, 0 /* 4-byte nop */ |
| 46 | ld.ub r8, str++ |
| 47 | sub r8, r8, 0 |
| 48 | breq 1f |
| 49 | ld.ub r8, str++ |
| 50 | sub r8, r8, 0 |
| 51 | breq 1f |
| 52 | ld.ub r8, str++ |
| 53 | sub r8, r8, 0 |
| 54 | brne 1b |
| 55 | |
| 56 | 1: sub r12, 1 |
| 57 | sub r12, r11 |
| 58 | retal r12 |
| 59 | |
| 60 | .size strlen, . - strlen |
| 61 | |
| 62 | libc_hidden_def(strlen) |