projects / apple / libc.git / blame
| Commit | Line | Data |
|---|---|---|
| b5d655f7 A |
1 | /* |
| 2 | * Copyright (c) 2007 Apple Inc. All rights reserved. | |
| 3 | * | |
| 4 | * @APPLE_LICENSE_HEADER_START@ | |
| 5 | * | |
| 6 | * This file contains Original Code and/or Modifications of Original Code | |
| 7 | * as defined in and that are subject to the Apple Public Source License | |
| 8 | * Version 2.0 (the 'License'). You may not use this file except in | |
| 9 | * compliance with the License. Please obtain a copy of the License at | |
| 10 | * http://www.opensource.apple.com/apsl/ and read it before using this | |
| 11 | * file. | |
| 12 | * | |
| 13 | * The Original Code and all software distributed under the License are | |
| 14 | * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER | |
| 15 | * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES, | |
| 16 | * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY, | |
| 17 | * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT. | |
| 18 | * Please see the License for the specific language governing rights and | |
| 19 | * limitations under the License. | |
| 20 | * | |
| 21 | * @APPLE_LICENSE_HEADER_END@ | |
| 22 | */ | |
| 23 | ||
| 24 | #include <arm/arch.h> | |
| 25 | ||
| 26 | #ifdef _ARM_ARCH_5 | |
| 27 | .text | |
| 28 | ||
| 29 | .align 2 | |
| 30 | .globl _ffs | |
| 31 | _ffs: | |
| 32 | .globl _ffsl | |
| 33 | _ffsl: | |
| 34 | rsb r3, r0, #0 | |
| 35 | and r0, r0, r3 | |
| 36 | clz r0, r0 | |
| 37 | rsb r0, r0, #32 | |
| 38 | bx lr | |
| 39 | ||
| 40 | .align 2 | |
| 41 | .globl _fls | |
| 42 | _fls: | |
| 43 | .globl _flsl | |
| 44 | _flsl: | |
| 45 | clz r0, r0 | |
| 46 | rsb r0, r0, #32 | |
| 47 | bx lr | |
| 48 | #else | |
| 49 | #error need to define ffs for this architecture | |
| 50 | #endif |