projects / apple / libplatform.git / blame
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|---|---|---|
| ada7c492 A |
1 | /*- |
| 2 | * Copyright (c) 1990, 1993 | |
| 3 | * The Regents of the University of California. All rights reserved. | |
| 4 | * | |
| 5 | * Redistribution and use in source and binary forms, with or without | |
| 6 | * modification, are permitted provided that the following conditions | |
| 7 | * are met: | |
| 8 | * 1. Redistributions of source code must retain the above copyright | |
| 9 | * notice, this list of conditions and the following disclaimer. | |
| 10 | * 2. Redistributions in binary form must reproduce the above copyright | |
| 11 | * notice, this list of conditions and the following disclaimer in the | |
| 12 | * documentation and/or other materials provided with the distribution. | |
| 13 | * 4. Neither the name of the University nor the names of its contributors | |
| 14 | * may be used to endorse or promote products derived from this software | |
| 15 | * without specific prior written permission. | |
| 16 | * | |
| 17 | * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND | |
| 18 | * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE | |
| 19 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE | |
| 20 | * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE | |
| 21 | * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL | |
| 22 | * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS | |
| 23 | * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) | |
| 24 | * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT | |
| 25 | * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY | |
| 26 | * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF | |
| 27 | * SUCH DAMAGE. | |
| 28 | */ | |
| 29 | ||
| 30 | #include <TargetConditionals.h> | |
| 31 | #include <sys/cdefs.h> | |
| 32 | __FBSDID("$FreeBSD: src/lib/libc/string/ffsll.c,v 1.1 2008/11/03 10:22:19 kib Exp $"); | |
| 33 | ||
| 34 | #include <strings.h> | |
| 35 | ||
| 36 | /* | |
| 37 | * Find First Set bit | |
| 38 | */ | |
| 39 | int | |
| 40 | ffsll(long long mask) | |
| 41 | { | |
| 42 | #if __has_builtin(__builtin_ffsll) | |
| 43 | return __builtin_ffsll(mask); | |
| 44 | #elif __has_builtin(__builtin_ctzll) | |
| 45 | if (mask == 0) | |
| 46 | return (0); | |
| 47 | ||
| 48 | return __builtin_ctzll(mask) + 1; | |
| 49 | #else | |
| 50 | int bit; | |
| 51 | ||
| 52 | if (mask == 0) | |
| 53 | return (0); | |
| 54 | for (bit = 1; !(mask & 1); bit++) | |
| 55 | mask = (unsigned long long)mask >> 1; | |
| 56 | return (bit); | |
| 57 | #endif | |
| 58 | } | |
| 59 | ||
| 60 | #if VARIANT_DYLD && TARGET_IPHONE_SIMULATOR | |
| 61 | int | |
| 62 | ffsl(long mask) | |
| 63 | { | |
| 64 | #if __has_builtin(__builtin_ffsl) | |
| 65 | return __builtin_ffsl(mask); | |
| 66 | #elif __has_builtin(__builtin_ctzl) | |
| 67 | if (mask == 0) | |
| 68 | return (0); | |
| 69 | ||
| 70 | return __builtin_ctzl(mask) + 1; | |
| 71 | #else | |
| 72 | int bit; | |
| 73 | ||
| 74 | if (mask == 0) | |
| 75 | return (0); | |
| 76 | for (bit = 1; !(mask & 1); bit++) | |
| 77 | mask = (unsigned long)mask >> 1; | |
| 78 | return (bit); | |
| 79 | #endif | |
| 80 | } | |
| 81 | ||
| 82 | int | |
| 83 | ffs(int mask) | |
| 84 | { | |
| 85 | #if __has_builtin(__builtin_ffs) | |
| 86 | return __builtin_ffs(mask); | |
| 87 | #elif __has_builtin(__builtin_ctz) | |
| 88 | if (mask == 0) | |
| 89 | return (0); | |
| 90 | ||
| 91 | return __builtin_ctz(mask) + 1; | |
| 92 | #else | |
| 93 | int bit; | |
| 94 | ||
| 95 | if (mask == 0) | |
| 96 | return (0); | |
| 97 | for (bit = 1; !(mask & 1); bit++) | |
| 98 | mask = (unsigned)mask >> 1; | |
| 99 | return (bit); | |
| 100 | #endif | |
| 101 | } | |
| 102 | #endif | |
| 103 |