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// Copyright 2016 Yahoo Inc. 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();
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;
}
}
}
int Test::Main()
{
TEST_INIT("optimized_test");
testMsbIdx<uint32_t>();
testMsbIdx<uint64_t>();
TEST_FLUSH();
testLsbIdx<uint32_t>();
testLsbIdx<uint64_t>();
TEST_FLUSH();
EXPECT_EQUAL(Optimized::popCount(0u), 0);
EXPECT_EQUAL(Optimized::popCount(1u), 1);
EXPECT_EQUAL(Optimized::popCount(uint32_t(-1)), 32);
EXPECT_EQUAL(Optimized::popCount(0ul), 0);
EXPECT_EQUAL(Optimized::popCount(1ul), 1);
EXPECT_EQUAL(Optimized::popCount(uint64_t(-1l)), 64);
TEST_FLUSH();
TEST_DONE();
}
TEST_APPHOOK(Test)
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