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#include "popcount.h"
#include <library/cpp/testing/unittest/registar.h>
#include <util/random/random.h>
Y_UNIT_TEST_SUITE(TestPopCount) {
template <class T>
static inline ui32 SlowPopCount(T t) {
ui32 ret = 0;
while (t) {
if (t & T(1)) {
++ret;
}
t = t >> 1;
}
return ret;
}
template <class T>
static inline void Test() {
for (size_t i = 0; i < 10000; ++i) {
const T rndv = RandomNumber<T>();
UNIT_ASSERT_VALUES_EQUAL(SlowPopCount(rndv), PopCount(rndv));
}
}
Y_UNIT_TEST(Test8) {
Test<ui8>();
}
Y_UNIT_TEST(Test16) {
Test<ui16>();
}
Y_UNIT_TEST(Test32) {
Test<ui32>();
}
Y_UNIT_TEST(Test64) {
Test<ui64>();
}
Y_UNIT_TEST(TestPopCount) {
UNIT_ASSERT_VALUES_EQUAL(PopCount(0), 0);
UNIT_ASSERT_VALUES_EQUAL(PopCount(1), 1);
UNIT_ASSERT_VALUES_EQUAL(PopCount(1 << 10), 1);
UNIT_ASSERT_VALUES_EQUAL(PopCount((1 << 10) + 1), 2);
UNIT_ASSERT_VALUES_EQUAL(PopCount(0xFFFF), 16);
UNIT_ASSERT_VALUES_EQUAL(PopCount(0xFFFFFFFF), 32);
UNIT_ASSERT_VALUES_EQUAL(PopCount(0x55555555), 16);
UNIT_ASSERT_VALUES_EQUAL(0, PopCount(0ULL));
UNIT_ASSERT_VALUES_EQUAL(1, PopCount(1ULL));
UNIT_ASSERT_VALUES_EQUAL(16, PopCount(0xAAAAAAAAULL));
UNIT_ASSERT_VALUES_EQUAL(32, PopCount(0xFFFFFFFFULL));
UNIT_ASSERT_VALUES_EQUAL(32, PopCount(0xAAAAAAAAAAAAAAAAULL));
UNIT_ASSERT_VALUES_EQUAL(64, PopCount(0xFFFFFFFFFFFFFFFFULL));
ui64 v = 0;
for (int i = 0; i < 64; v |= 1ULL << i, ++i) {
UNIT_ASSERT_VALUES_EQUAL(i, PopCount(v));
}
}
}
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