mirror of
https://github.com/cryb-to/cryb-to.git
synced 2024-05-21 17:00:15 +00:00
181 lines
4.4 KiB
C
181 lines
4.4 KiB
C
/*-
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* Copyright (c) 2012 The University of Oslo
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* Copyright (c) 2012-2017 Dag-Erling Smørgrav
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. The name of the author may not be used to endorse or promote
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* products derived from this software without specific prior written
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* permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#ifndef CRYB_BITWISE_H_INCLUDED
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#define CRYB_BITWISE_H_INCLUDED
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#ifndef CRYB_TO
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#include <cryb/to.h>
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#endif
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CRYB_BEGIN
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#define CRYB_ROL_ROR(N) \
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static inline uint##N##_t rol##N(uint##N##_t i, int n) \
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{ \
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return (i << (n & (N - 1)) | i >> (-n & (N - 1))); \
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} \
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static inline uint##N##_t ror##N(uint##N##_t i, int n) \
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{ \
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return (i << (-n & (N - 1)) | i >> (n & (N - 1))); \
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}
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CRYB_ROL_ROR(8);
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CRYB_ROL_ROR(16);
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CRYB_ROL_ROR(32);
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CRYB_ROL_ROR(64);
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#undef CRYB_ROL_ROR
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#if !HAVE_FFS
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#define ffs cryb_ffs
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#endif
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#if !HAVE_FFSL
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#define ffsl cryb_ffsl
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#endif
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#if !HAVE_FFSLL
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#define ffsll cryb_ffsll
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#endif
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#if !HAVE_FLS
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#define fls cryb_fls
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#endif
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#if !HAVE_FLSL
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#define flsl cryb_flsl
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#endif
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#if !HAVE_FLSLL
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#define flsll cryb_flsll
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#endif
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static inline int cryb_ffs(int n) {
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#if HAVE___BUILTIN_FFS
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return (__builtin_ffs(n));
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#elif HAVE___BUILTIN_CTZ
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return (n ? __builtin_ctz(n) : 0);
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#else
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unsigned int m;
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unsigned int i;
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if (n == 0)
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return (0);
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for (i = m = 1; i <= sizeof n * 8; ++i, m <<= 1)
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if ((unsigned int)n & m)
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break;
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return (i);
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#endif
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}
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static inline int cryb_ffsl(long int n) {
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#if HAVE___BUILTIN_FFSL
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return (__builtin_ffsl(n));
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#elif HAVE___BUILTIN_CLZ
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return (n ? __builtin_ctz(n) : 0);
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#else
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unsigned long int m;
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unsigned int i;
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if (n == 0)
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return (0);
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for (i = m = 1; i <= sizeof n * 8; ++i, m <<= 1)
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if ((unsigned long int)n & m)
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break;
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return (i);
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#endif
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}
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static inline int cryb_ffsll(long long int n) {
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#if HAVE___BUILTIN_FFSLL
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return (__builtin_ffsll(n));
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#elif HAVE___BUILTIN_CLZ
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return (n ? __builtin_ctz(n) : 0);
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#else
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unsigned long long int m;
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unsigned int i;
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if (n == 0)
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return (0);
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for (i = m = 1; i <= sizeof n * 8; ++i, m <<= 1)
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if ((unsigned long long int)n & m)
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break;
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return (i);
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#endif
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}
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static inline int cryb_fls(int n) {
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#if HAVE___BUILTIN_FLS
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return (__builtin_fls(n));
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#elif HAVE___BUILTIN_CLZ
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return (n ? (8 * sizeof n) - __builtin_clz(n) : 0);
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#else
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unsigned int m;
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unsigned int i;
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if (n == 0)
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return (0);
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for (i = sizeof n * 8, m = 1U << (i - 1); i > 0; --i, m >>= 1)
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if ((unsigned int)n & m)
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break;
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return (i);
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#endif
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}
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static inline int cryb_flsl(long int n) {
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#if HAVE___BUILTIN_FLSL
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return (__builtin_flsl(n));
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#elif HAVE___BUILTIN_CLZ
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return (n ? (8 * sizeof n) - __builtin_clzl(n) : 0);
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#else
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unsigned long int m;
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unsigned int i;
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if (n == 0)
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return (0);
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for (i = sizeof n * 8, m = 1UL << (i - 1); i > 0; --i, m >>= 1)
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if ((unsigned long int)n & m)
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break;
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return (i);
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#endif
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}
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static inline int cryb_flsll(long long int n) {
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#if HAVE___BUILTIN_FLSLL
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return (__builtin_flsll(n));
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#elif HAVE___BUILTIN_CLZ
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return (n ? (8 * sizeof n) - __builtin_clzll(n) : 0);
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#else
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unsigned long long int m;
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unsigned int i;
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if (n == 0)
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return (0);
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for (i = sizeof n * 8, m = 1ULL << (i - 1); i > 0; --i, m >>= 1)
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if ((unsigned long long int)n & m)
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break;
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return (i);
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#endif
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}
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CRYB_END
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#endif
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