projects / apple / libc.git / blame
| Commit | Line | Data |
|---|---|---|
| e9ce8d39 A |
1 | /* |
| 2 | * Copyright (c) 1999 Apple Computer, Inc. All rights reserved. | |
| 3 | * | |
| 4 | * @APPLE_LICENSE_HEADER_START@ | |
| 5 | * | |
| 734aad71 A |
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 | |
| e9ce8d39 A |
15 | * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES, |
| 16 | * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY, | |
| 734aad71 A |
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. | |
| e9ce8d39 A |
20 | * |
| 21 | * @APPLE_LICENSE_HEADER_END@ | |
| 22 | */ | |
| 23 | /* Copyright (c) 1992, 1997 NeXT Software, Inc. All rights reserved. | |
| 24 | * | |
| 25 | * File: libc/gen/ppc/ffs.s | |
| 26 | * | |
| 27 | * Find the first bit set (starting with the least significant bit). | |
| 28 | * | |
| 29 | * HISTORY | |
| 30 | * | |
| 31 | * 24-Jan-1997 Umesh Vaishampayan (umeshv@NeXT.com) | |
| 32 | * Ported to PPC. | |
| 33 | * | |
| 34 | * 19-Jan-1998 Matt Watson (mwatson@apple.com) | |
| 35 | * Simplified | |
| 36 | * | |
| 37 | * 10-Mar-1998 Matt Watson (mwatson@apple.com) | |
| 38 | * Correctified | |
| 39 | * | |
| 40 | */ | |
| 41 | ||
| 42 | .text | |
| 43 | .align 2 | |
| 44 | .globl _ffs | |
| 45 | _ffs: | |
| 46 | neg r0,r3 | |
| 47 | and r3,r0,r3 | |
| 48 | cntlzw r3,r3 | |
| 49 | subfic r3,r3,32 | |
| 50 | blr |