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/**
* This code is released under the
* Apache License Version 2.0 http://www.apache.org/licenses/.
*
* (c) Daniel Lemire, http://lemire.me/en/
*
* Some code from the public domain tuklib.
*/
#ifndef EWAHUTIL_H
#define EWAHUTIL_H
#include <iso646.h> // mostly for Microsoft compilers
#include <limits.h>
#include <stdint.h> // part of Visual Studio 2010 and better
#include <stdlib.h>
#include <string.h>
#include <algorithm>
#include <cassert>
#include <cstddef>
#include <iostream>
#include <sstream>
#include <stdexcept>
#include <string>
#include <vector>
#ifdef _MSC_VER
#include <intrin.h>
#endif
#if ((ULONG_MAX) == (UINT_MAX))
#define UWORD uint32_t
#else
#define UWORD uint64_t
#endif
namespace ewah {
static inline uint32_t ctz64(uint64_t n) {
#if defined(__GNUC__) && UINT_MAX >= UINT32_MAX && ULLONG_MAX >= UINT64_MAX
return static_cast<uint32_t>(__builtin_ctzll(n));
#elif defined(_WIN64) && defined(_MSC_VER) && _MSC_VER >= 1400 && \
ULONG_MAX >= UINT64_MAX
uint32_t i;
_BitScanForward64((unsigned long *)&i, n);
return i;
#else
uint32_t i = 1;
if ((n & static_cast<uint64_t>(4294967295)) == 0) {
n >>= 32;
i += 32;
}
if ((n & static_cast<uint64_t>(0x0000FFFFUL)) == 0) {
n >>= 16;
i += 16;
}
if ((n & static_cast<uint64_t>(0x000000FFUL)) == 0) {
n >>= 8;
i += 8;
}
if ((n & static_cast<uint64_t>(0x0000000FUL)) == 0) {
n >>= 4;
i += 4;
}
if ((n & static_cast<uint64_t>(0x00000003UL)) == 0) {
n >>= 2;
i += 2;
}
i -= (n & 0x1);
return i;
#endif
}
static inline uint32_t ctz32(uint32_t n) {
#if defined(__GNUC__) && UINT_MAX >= UINT32_MAX
return static_cast<uint32_t>(__builtin_ctz(n));
#elif defined(__GNUC__) && (defined(__i386__) || defined(__x86_64__))
uint32_t i;
__asm__("bsfl %1, %0" : "=r"(i) : "rm"(n));
return i;
#elif defined(_MSC_VER) && _MSC_VER >= 1400
uint32_t i;
_BitScanForward((unsigned long *)&i, n);
return i;
#else
uint32_t i = 1;
if ((n & static_cast<uint32_t>(0x0000FFFF)) == 0) {
n >>= 16;
i += 16;
}
if ((n & static_cast<uint32_t>(0x000000FF)) == 0) {
n >>= 8;
i += 8;
}
if ((n & static_cast<uint32_t>(0x0000000F)) == 0) {
n >>= 4;
i += 4;
}
if ((n & static_cast<uint32_t>(0x00000003)) == 0) {
n >>= 2;
i += 2;
}
i -= (n & 1);
return i;
#endif
}
static inline uint32_t ctz16(uint16_t n) {
#if defined(__GNUC__) && UINT_MAX >= UINT32_MAX
return static_cast<uint32_t>(__builtin_ctz(n));
#elif defined(__GNUC__) && (defined(__i386__) || defined(__x86_64__))
uint32_t i;
__asm__("bsfl %1, %0" : "=r"(i) : "rm"(n));
return i;
#elif defined(_MSC_VER) && _MSC_VER >= 1400
uint32_t i;
_BitScanForward((unsigned long *)&i, n);
return i;
#else
uint32_t i = 1;
if ((n & static_cast<uint16_t>(0x000000FF)) == 0) {
n >>= 8;
i += 8;
}
if ((n & static_cast<uint16_t>(0x0000000F)) == 0) {
n >>= 4;
i += 4;
}
if ((n & static_cast<uint16_t>(0x00000003)) == 0) {
n >>= 2;
i += 2;
}
i -= (n & 1);
return i;
#endif
}
#ifdef __GNUC__
/**
* count the number of bits set to one (32 bit version)
*/
inline uint32_t countOnes(uint32_t x) {
return static_cast<uint32_t>(__builtin_popcount(x));
}
#elif defined(_MSC_VER) && _MSC_VER >= 1400 && !defined(_M_ARM)&& !defined(_M_ARM64)
inline uint32_t countOnes(uint32_t x) { return __popcnt(x); }
#else
inline uint32_t countOnes(uint32_t v) {
v = v - ((v >> 1) & 0x55555555);
v = (v & 0x33333333) + ((v >> 2) & 0x33333333);
return static_cast<uint32_t>((((v + (v >> 4)) & 0x0F0F0F0F) * 0x01010101) >>
24);
}
#endif
#ifdef __GNUC__
/**
* count the number of bits set to one (64 bit version)
*/
inline uint32_t countOnes(uint64_t x) {
return static_cast<uint32_t>(__builtin_popcountll(x));
}
#elif defined(_WIN64) && defined(_MSC_VER) && _MSC_VER >= 1400 && !defined(_M_ARM64)
inline uint32_t countOnes(uint64_t x) {
return static_cast<uint32_t>(__popcnt64(static_cast<__int64>(x)));
}
#else
inline uint32_t countOnes(uint64_t v) {
v = v - ((v >> 1) & 0x5555555555555555);
v = (v & 0x3333333333333333) + ((v >> 2) & 0x3333333333333333);
v = ((v + (v >> 4)) & 0x0F0F0F0F0F0F0F0F);
return static_cast<uint32_t>((v * (0x0101010101010101)) >> 56);
}
#endif
inline uint32_t countOnes(uint16_t v) {
return countOnes(static_cast<uint32_t>(v));
}
inline uint32_t numberOfTrailingZeros(uint32_t x) {
if (x == 0)
return 32;
return ctz32(x);
}
inline uint32_t numberOfTrailingZeros(uint64_t x) {
if (x == 0)
return 64;
return ctz64(x);
}
inline uint32_t numberOfTrailingZeros(uint16_t x) {
if (x == 0)
return 16;
return ctz16(x);
}
/**
* Returns the binary representation of a binary word.
*/
template <class uword> std::string toBinaryString(const uword w) {
std::ostringstream convert;
for (uint32_t k = 0; k < sizeof(uword) * 8; ++k) {
if (w & (static_cast<uword>(1) << k))
convert << "1";
else
convert << "0";
}
return convert.str();
}
} // namespace ewah
#endif
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