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#include "sdsl/int_vector.hpp"
#include "sdsl/bits.hpp"
#include "sdsl/util.hpp"
#include "gtest/gtest.h"
#include <vector>
#include <string>
namespace
{
SDSL_UNUSED uint32_t cnt_naive(uint64_t x)
{
uint32_t res = 0;
for (int i=0; i<64; ++i) {
res += x&1;
x>>=1;
}
return res;
}
SDSL_UNUSED inline uint32_t cnt10_naive(uint64_t x, uint64_t& c)
{
uint32_t sum = 0, lastbit = c;
for (uint32_t i=0; i<64; ++i) {
if ((x&1) == 0 and lastbit == 1) {
++sum;
}
lastbit = (x&1);
x >>= 1;
}
c = lastbit;
return sum;
}
SDSL_UNUSED uint32_t cnt11_naive(uint64_t x)
{
uint32_t res = 0;
for (int i=0; i<64; ++i) {
if ((x&3) == 3) {
++res;
++i;
x>>=1;
}
x>>=1;
}
return res;
}
SDSL_UNUSED inline uint32_t hi_naive(uint64_t x)
{
uint32_t res=63;
while (x) {
if (x&0x8000000000000000ULL) {
return res;
}
--res;
x<<=1;
}
return 0;
}
inline uint32_t lo_naive(uint64_t x)
{
if (x&1)
return 0;
x>>=1;
for (int i=1; i<64; ++i)
if (x&1)
return i;
else
x>>=1;
return 63;
}
SDSL_UNUSED inline uint32_t sel_naive(uint64_t x, uint32_t i)
{
uint32_t pos = 0;
while (x) {
i -= x&1;
x>>=1;
if (!i) break;
++pos;
}
return pos;
}
SDSL_UNUSED uint32_t sel11_naive(uint64_t x, uint32_t i)
{
for (uint32_t j=0; j<63; ++j) {
if ((x&3)==3) {
i--;
if (!i) return j+1;
x>>=1;
++j;
}
x>>=1;
}
return 63;
}
SDSL_UNUSED inline uint64_t rev_naive(uint64_t x)
{
uint64_t y = 0;
for (size_t i=0; i<64; i++) {
if (x&(1ULL << i)) {
y |= (1ULL << (63-i));
}
}
return y;
}
// The fixture for testing class int_vector.
class bits_test : public ::testing::Test
{
protected:
bits_test()
{
m_data = sdsl::int_vector<64>(1000000);
sdsl::util::set_random_bits(m_data);
}
virtual ~bits_test() { }
virtual void SetUp() { }
virtual void TearDown() { }
sdsl::int_vector<64> m_data;
};
//! Test the default constructor
TEST_F(bits_test, cnt)
{
for (uint64_t i=0; i<64; ++i) {
ASSERT_EQ((uint64_t)1, sdsl::bits::cnt(1ULL<<i));
}
}
//! Test the parametrized constructor
TEST_F(bits_test, sel)
{
for (uint64_t i=0; i<64; ++i) {
ASSERT_EQ(i, sdsl::bits::sel(1ULL<<i, 1));
}
for (uint64_t i=0; i < this->m_data.size(); ++i) {
uint64_t x = this->m_data[i];
for (uint64_t j=0, ones=0; j<64; ++j) {
if ((x >> j)&1) {
++ones;
ASSERT_EQ(j, sdsl::bits::sel(x, ones));
}
}
}
}
TEST_F(bits_test, hi)
{
for (uint64_t i=0; i<64; ++i) {
uint64_t x = 1ULL<<i;
ASSERT_EQ(hi_naive(x), sdsl::bits::hi(x));
}
}
TEST_F(bits_test, lo)
{
for (uint64_t i=0; i<64; ++i) {
uint64_t x = 1ULL<<i;
ASSERT_EQ(lo_naive(x), sdsl::bits::lo(x));
}
}
TEST_F(bits_test, rev)
{
for (uint64_t i=0; i < this->m_data.size(); ++i) {
uint64_t x = this->m_data[i];
uint64_t rx = sdsl::bits::rev(x);
ASSERT_EQ(rev_naive(x),rx);
ASSERT_EQ(x,sdsl::bits::rev(rx));
}
}
} // namespace
int main(int argc, char** argv)
{
::testing::InitGoogleTest(&argc, argv);
return RUN_ALL_TESTS();
}
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