f14fb60209
* Updating common/lib * Updating lib/csu * Updating lib/libc * Updating libexec/ld.elf_so * Corrected test on __minix in featuretest to actually follow the meaning of the comment. * Cleaned up _REENTRANT-related defintions. * Disabled -D_REENTRANT for libfetch * Removing some unneeded __NBSD_LIBC defines and tests Change-Id: Ic1394baef74d11b9f86b312f5ff4bbc3cbf72ce2
294 lines
6.2 KiB
C
294 lines
6.2 KiB
C
/* $NetBSD: bitops.h,v 1.9 2011/07/30 16:35:58 christos Exp $ */
|
|
|
|
/*-
|
|
* Copyright (c) 2007, 2010 The NetBSD Foundation, Inc.
|
|
* All rights reserved.
|
|
*
|
|
* This code is derived from software contributed to The NetBSD Foundation
|
|
* by Christos Zoulas and Joerg Sonnenberger.
|
|
*
|
|
* Redistribution and use in source and binary forms, with or without
|
|
* modification, are permitted provided that the following conditions
|
|
* are met:
|
|
* 1. Redistributions of source code must retain the above copyright
|
|
* notice, this list of conditions and the following disclaimer.
|
|
* 2. Redistributions in binary form must reproduce the above copyright
|
|
* notice, this list of conditions and the following disclaimer in the
|
|
* documentation and/or other materials provided with the distribution.
|
|
*
|
|
* THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
|
|
* ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
|
|
* TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
|
|
* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
|
|
* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
|
|
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
|
|
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
|
|
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
|
|
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
|
|
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
|
|
* POSSIBILITY OF SUCH DAMAGE.
|
|
*/
|
|
#ifndef _SYS_BITOPS_H_
|
|
#define _SYS_BITOPS_H_
|
|
|
|
#include <sys/stdint.h>
|
|
|
|
/*
|
|
* Find First Set functions
|
|
*/
|
|
#ifndef ffs32
|
|
static __inline int __unused
|
|
ffs32(uint32_t _n)
|
|
{
|
|
int _v;
|
|
|
|
if (!_n)
|
|
return 0;
|
|
|
|
_v = 1;
|
|
if ((_n & 0x0000FFFFU) == 0) {
|
|
_n >>= 16;
|
|
_v += 16;
|
|
}
|
|
if ((_n & 0x000000FFU) == 0) {
|
|
_n >>= 8;
|
|
_v += 8;
|
|
}
|
|
if ((_n & 0x0000000FU) == 0) {
|
|
_n >>= 4;
|
|
_v += 4;
|
|
}
|
|
if ((_n & 0x00000003U) == 0) {
|
|
_n >>= 2;
|
|
_v += 2;
|
|
}
|
|
if ((_n & 0x00000001U) == 0) {
|
|
_n >>= 1;
|
|
_v += 1;
|
|
}
|
|
return _v;
|
|
}
|
|
#endif
|
|
|
|
#ifndef ffs64
|
|
static __inline int __unused
|
|
ffs64(uint64_t _n)
|
|
{
|
|
int _v;
|
|
|
|
if (!_n)
|
|
return 0;
|
|
|
|
_v = 1;
|
|
if ((_n & 0x00000000FFFFFFFFULL) == 0) {
|
|
_n >>= 32;
|
|
_v += 32;
|
|
}
|
|
if ((_n & 0x000000000000FFFFULL) == 0) {
|
|
_n >>= 16;
|
|
_v += 16;
|
|
}
|
|
if ((_n & 0x00000000000000FFULL) == 0) {
|
|
_n >>= 8;
|
|
_v += 8;
|
|
}
|
|
if ((_n & 0x000000000000000FULL) == 0) {
|
|
_n >>= 4;
|
|
_v += 4;
|
|
}
|
|
if ((_n & 0x0000000000000003ULL) == 0) {
|
|
_n >>= 2;
|
|
_v += 2;
|
|
}
|
|
if ((_n & 0x0000000000000001ULL) == 0) {
|
|
_n >>= 1;
|
|
_v += 1;
|
|
}
|
|
return _v;
|
|
}
|
|
#endif
|
|
|
|
/*
|
|
* Find Last Set functions
|
|
*/
|
|
#ifndef fls32
|
|
static __inline int __unused
|
|
fls32(uint32_t _n)
|
|
{
|
|
int _v;
|
|
|
|
if (!_n)
|
|
return 0;
|
|
|
|
_v = 32;
|
|
if ((_n & 0xFFFF0000U) == 0) {
|
|
_n <<= 16;
|
|
_v -= 16;
|
|
}
|
|
if ((_n & 0xFF000000U) == 0) {
|
|
_n <<= 8;
|
|
_v -= 8;
|
|
}
|
|
if ((_n & 0xF0000000U) == 0) {
|
|
_n <<= 4;
|
|
_v -= 4;
|
|
}
|
|
if ((_n & 0xC0000000U) == 0) {
|
|
_n <<= 2;
|
|
_v -= 2;
|
|
}
|
|
if ((_n & 0x80000000U) == 0) {
|
|
_n <<= 1;
|
|
_v -= 1;
|
|
}
|
|
return _v;
|
|
}
|
|
#endif
|
|
|
|
#ifndef fls64
|
|
static __inline int __unused
|
|
fls64(uint64_t _n)
|
|
{
|
|
int _v;
|
|
|
|
if (!_n)
|
|
return 0;
|
|
|
|
_v = 64;
|
|
if ((_n & 0xFFFFFFFF00000000ULL) == 0) {
|
|
_n <<= 32;
|
|
_v -= 32;
|
|
}
|
|
if ((_n & 0xFFFF000000000000ULL) == 0) {
|
|
_n <<= 16;
|
|
_v -= 16;
|
|
}
|
|
if ((_n & 0xFF00000000000000ULL) == 0) {
|
|
_n <<= 8;
|
|
_v -= 8;
|
|
}
|
|
if ((_n & 0xF000000000000000ULL) == 0) {
|
|
_n <<= 4;
|
|
_v -= 4;
|
|
}
|
|
if ((_n & 0xC000000000000000ULL) == 0) {
|
|
_n <<= 2;
|
|
_v -= 2;
|
|
}
|
|
if ((_n & 0x8000000000000000ULL) == 0) {
|
|
_n <<= 1;
|
|
_v -= 1;
|
|
}
|
|
return _v;
|
|
}
|
|
#endif
|
|
|
|
/*
|
|
* Integer logarithm, returns -1 on error. Inspired by the linux
|
|
* version written by David Howells.
|
|
*/
|
|
#define _ilog2_helper(_n, _x) ((_n) & (1ULL << (_x))) ? _x :
|
|
#define ilog2(_n) \
|
|
( \
|
|
__builtin_constant_p(_n) ? ( \
|
|
_ilog2_helper(_n, 63) \
|
|
_ilog2_helper(_n, 62) \
|
|
_ilog2_helper(_n, 61) \
|
|
_ilog2_helper(_n, 60) \
|
|
_ilog2_helper(_n, 59) \
|
|
_ilog2_helper(_n, 58) \
|
|
_ilog2_helper(_n, 57) \
|
|
_ilog2_helper(_n, 56) \
|
|
_ilog2_helper(_n, 55) \
|
|
_ilog2_helper(_n, 54) \
|
|
_ilog2_helper(_n, 53) \
|
|
_ilog2_helper(_n, 52) \
|
|
_ilog2_helper(_n, 51) \
|
|
_ilog2_helper(_n, 50) \
|
|
_ilog2_helper(_n, 49) \
|
|
_ilog2_helper(_n, 48) \
|
|
_ilog2_helper(_n, 47) \
|
|
_ilog2_helper(_n, 46) \
|
|
_ilog2_helper(_n, 45) \
|
|
_ilog2_helper(_n, 44) \
|
|
_ilog2_helper(_n, 43) \
|
|
_ilog2_helper(_n, 42) \
|
|
_ilog2_helper(_n, 41) \
|
|
_ilog2_helper(_n, 40) \
|
|
_ilog2_helper(_n, 39) \
|
|
_ilog2_helper(_n, 38) \
|
|
_ilog2_helper(_n, 37) \
|
|
_ilog2_helper(_n, 36) \
|
|
_ilog2_helper(_n, 35) \
|
|
_ilog2_helper(_n, 34) \
|
|
_ilog2_helper(_n, 33) \
|
|
_ilog2_helper(_n, 32) \
|
|
_ilog2_helper(_n, 31) \
|
|
_ilog2_helper(_n, 30) \
|
|
_ilog2_helper(_n, 29) \
|
|
_ilog2_helper(_n, 28) \
|
|
_ilog2_helper(_n, 27) \
|
|
_ilog2_helper(_n, 26) \
|
|
_ilog2_helper(_n, 25) \
|
|
_ilog2_helper(_n, 24) \
|
|
_ilog2_helper(_n, 23) \
|
|
_ilog2_helper(_n, 22) \
|
|
_ilog2_helper(_n, 21) \
|
|
_ilog2_helper(_n, 20) \
|
|
_ilog2_helper(_n, 19) \
|
|
_ilog2_helper(_n, 18) \
|
|
_ilog2_helper(_n, 17) \
|
|
_ilog2_helper(_n, 16) \
|
|
_ilog2_helper(_n, 15) \
|
|
_ilog2_helper(_n, 14) \
|
|
_ilog2_helper(_n, 13) \
|
|
_ilog2_helper(_n, 12) \
|
|
_ilog2_helper(_n, 11) \
|
|
_ilog2_helper(_n, 10) \
|
|
_ilog2_helper(_n, 9) \
|
|
_ilog2_helper(_n, 8) \
|
|
_ilog2_helper(_n, 7) \
|
|
_ilog2_helper(_n, 6) \
|
|
_ilog2_helper(_n, 5) \
|
|
_ilog2_helper(_n, 4) \
|
|
_ilog2_helper(_n, 3) \
|
|
_ilog2_helper(_n, 2) \
|
|
_ilog2_helper(_n, 1) \
|
|
_ilog2_helper(_n, 0) \
|
|
-1) : ((sizeof(_n) > 4 ? fls64(_n) : fls32(_n)) - 1) \
|
|
)
|
|
|
|
static __inline void
|
|
fast_divide32_prepare(uint32_t _div, uint32_t * __restrict _m,
|
|
uint8_t *__restrict _s1, uint8_t *__restrict _s2)
|
|
{
|
|
uint64_t _mt;
|
|
int _l;
|
|
|
|
_l = fls32(_div - 1);
|
|
_mt = (uint64_t)(0x100000000ULL * ((1ULL << _l) - _div));
|
|
*_m = (uint32_t)(_mt / _div + 1);
|
|
*_s1 = (_l > 1) ? 1 : _l;
|
|
*_s2 = (_l == 0) ? 0 : _l - 1;
|
|
}
|
|
|
|
/* ARGSUSED */
|
|
static __inline uint32_t
|
|
fast_divide32(uint32_t _v, uint32_t _div __unused, uint32_t _m, uint8_t _s1,
|
|
uint8_t _s2)
|
|
{
|
|
uint32_t _t;
|
|
|
|
_t = (uint32_t)(((uint64_t)_v * _m) >> 32);
|
|
return (_t + ((_v - _t) >> _s1)) >> _s2;
|
|
}
|
|
|
|
static __inline uint32_t
|
|
fast_remainder32(uint32_t _v, uint32_t _div, uint32_t _m, uint8_t _s1,
|
|
uint8_t _s2)
|
|
{
|
|
|
|
return _v - _div * fast_divide32(_v, _div, _m, _s1, _s2);
|
|
}
|
|
|
|
#endif /* _SYS_BITOPS_H_ */
|