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// Copyright Vespa.ai. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
#include <vespa/vespalib/testkit/testapp.h>
#include <vespa/vespalib/util/optimized.h>
using namespace vespalib;
class Test : public vespalib::TestApp
{
private:
template<typename T>
void testMsbIdx();
template<typename T>
void testLsbIdx();
template<typename T>
void testPopCount();
public:
int Main() override;
};
template<typename T>
void Test::testMsbIdx()
{
EXPECT_EQUAL(Optimized::msbIdx(T(0)), 0);
EXPECT_EQUAL(Optimized::msbIdx(T(1)), 0);
EXPECT_EQUAL(Optimized::msbIdx(T(-1)), int(sizeof(T)*8 - 1));
T v(static_cast<T>(-1));
for (size_t i(0); i < sizeof(T); i++) {
for (size_t j(0); j < 8; j++) {
EXPECT_EQUAL(Optimized::msbIdx(v), int(sizeof(T)*8 - (i*8+j) - 1));
v = v >> 1;
}
}
}
template<typename T>
void Test::testLsbIdx()
{
EXPECT_EQUAL(Optimized::lsbIdx(T(0)), 0);
EXPECT_EQUAL(Optimized::lsbIdx(T(1)), 0);
EXPECT_EQUAL(Optimized::lsbIdx(T(T(1)<<(sizeof(T)*8 - 1))), int(sizeof(T)*8 - 1));
EXPECT_EQUAL(Optimized::lsbIdx(T(-1)), 0);
T v(static_cast<T>(-1));
for (size_t i(0); i < sizeof(T); i++) {
for (size_t j(0); j < 8; j++) {
EXPECT_EQUAL(Optimized::lsbIdx(v), int(i*8+j));
v = v << 1;
}
}
}
template<typename T>
void Test::testPopCount()
{
EXPECT_EQUAL(0, Optimized::popCount(T(0)));
EXPECT_EQUAL(1, Optimized::popCount(T(1)));
EXPECT_EQUAL(int(8 * sizeof(T)), Optimized::popCount(T(-1)));
}
int Test::Main()
{
TEST_INIT("optimized_test");
testMsbIdx<unsigned int>();
testMsbIdx<unsigned long>();
testMsbIdx<unsigned long long>();
TEST_FLUSH();
testLsbIdx<unsigned int>();
testLsbIdx<unsigned long>();
testLsbIdx<unsigned long long>();
TEST_FLUSH();
testPopCount<unsigned int>();
testPopCount<unsigned long>();
testPopCount<unsigned long long>();
TEST_FLUSH();
TEST_DONE();
}
TEST_APPHOOK(Test)
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