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108 lines
3.7 KiB
C
108 lines
3.7 KiB
C
/*-
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* Copyright (c) 1982, 1986, 1991, 1993, 1994
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* The Regents of the University of California. All rights reserved.
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* (c) UNIX System Laboratories, Inc.
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* All or some portions of this file are derived from material licensed
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* to the University of California by American Telephone and Telegraph
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* Co. or Unix System Laboratories, Inc. and are reproduced herein with
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* the permission of UNIX System Laboratories, Inc.
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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. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS 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 REGENTS 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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* @(#)types.h 8.6 (Berkeley) 2/19/95
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* $FreeBSD$
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*/
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#ifndef _RTEMS_BSD_MACHINE_BITSTRING_H_
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#define _RTEMS_BSD_MACHINE_BITSTRING_H_
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#ifndef _SYS_BITSTRING_H_
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#error "the header file <sys/bitstring.h> must be included first"
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#endif
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#ifdef __POPCNT__
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#define __bitcount64(x) __builtin_popcountll((__uint64_t)(x))
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#define __bitcount32(x) __builtin_popcount((__uint32_t)(x))
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#define __bitcount16(x) __builtin_popcount((__uint16_t)(x))
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#define __bitcountl(x) __builtin_popcountl((unsigned long)(x))
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#define __bitcount(x) __builtin_popcount((unsigned int)(x))
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#else
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/*
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* Population count algorithm using SWAR approach
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* - "SIMD Within A Register".
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*/
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static __inline __uint16_t
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__bitcount16(__uint16_t _x)
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{
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_x = (_x & 0x5555) + ((_x & 0xaaaa) >> 1);
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_x = (_x & 0x3333) + ((_x & 0xcccc) >> 2);
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_x = (_x + (_x >> 4)) & 0x0f0f;
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_x = (_x + (_x >> 8)) & 0x00ff;
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return (_x);
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}
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static __inline __uint32_t
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__bitcount32(__uint32_t _x)
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{
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_x = (_x & 0x55555555) + ((_x & 0xaaaaaaaa) >> 1);
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_x = (_x & 0x33333333) + ((_x & 0xcccccccc) >> 2);
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_x = (_x + (_x >> 4)) & 0x0f0f0f0f;
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_x = (_x + (_x >> 8));
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_x = (_x + (_x >> 16)) & 0x000000ff;
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return (_x);
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}
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#ifdef __LP64__
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static __inline __uint64_t
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__bitcount64(__uint64_t _x)
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{
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_x = (_x & 0x5555555555555555) + ((_x & 0xaaaaaaaaaaaaaaaa) >> 1);
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_x = (_x & 0x3333333333333333) + ((_x & 0xcccccccccccccccc) >> 2);
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_x = (_x + (_x >> 4)) & 0x0f0f0f0f0f0f0f0f;
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_x = (_x + (_x >> 8));
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_x = (_x + (_x >> 16));
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_x = (_x + (_x >> 32)) & 0x000000ff;
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return (_x);
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}
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#define __bitcountl(x) __bitcount64((unsigned long)(x))
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#else
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static __inline __uint64_t
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__bitcount64(__uint64_t _x)
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{
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return (__bitcount32(_x >> 32) + __bitcount32(_x));
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}
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#define __bitcountl(x) __bitcount32((unsigned long)(x))
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#endif
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#define __bitcount(x) __bitcount32((unsigned int)(x))
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#endif
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#endif /* !_RTEMS_BSD_MACHINE_BITSTRING_H_ */
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