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util: Add SaturatingAdd helper

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MarcoFalke 2022-02-01 13:43:42 +01:00
parent 1337b93f50
commit faa7d8a3f7
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3 changed files with 48 additions and 5 deletions
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16
src/test/util_tests.cpp
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@ -1474,9 +1474,17 @@ static void TestAddMatrixOverflow()
constexpr T MAXI{std::numeric_limits<T>::max()};
BOOST_CHECK(!CheckedAdd(T{1}, MAXI));
BOOST_CHECK(!CheckedAdd(MAXI, MAXI));
BOOST_CHECK_EQUAL(MAXI, SaturatingAdd(T{1}, MAXI));
BOOST_CHECK_EQUAL(MAXI, SaturatingAdd(MAXI, MAXI));
BOOST_CHECK_EQUAL(0, CheckedAdd(T{0}, T{0}).value());
BOOST_CHECK_EQUAL(MAXI, CheckedAdd(T{0}, MAXI).value());
BOOST_CHECK_EQUAL(MAXI, CheckedAdd(T{1}, MAXI - 1).value());
BOOST_CHECK_EQUAL(MAXI - 1, CheckedAdd(T{1}, MAXI - 2).value());
BOOST_CHECK_EQUAL(0, SaturatingAdd(T{0}, T{0}));
BOOST_CHECK_EQUAL(MAXI, SaturatingAdd(T{0}, MAXI));
BOOST_CHECK_EQUAL(MAXI, SaturatingAdd(T{1}, MAXI - 1));
BOOST_CHECK_EQUAL(MAXI - 1, SaturatingAdd(T{1}, MAXI - 2));
}
/* Check for overflow or underflow */
@ -1488,9 +1496,17 @@ static void TestAddMatrix()
constexpr T MAXI{std::numeric_limits<T>::max()};
BOOST_CHECK(!CheckedAdd(T{-1}, MINI));
BOOST_CHECK(!CheckedAdd(MINI, MINI));
BOOST_CHECK_EQUAL(MINI, SaturatingAdd(T{-1}, MINI));
BOOST_CHECK_EQUAL(MINI, SaturatingAdd(MINI, MINI));
BOOST_CHECK_EQUAL(MINI, CheckedAdd(T{0}, MINI).value());
BOOST_CHECK_EQUAL(MINI, CheckedAdd(T{-1}, MINI + 1).value());
BOOST_CHECK_EQUAL(-1, CheckedAdd(MINI, MAXI).value());
BOOST_CHECK_EQUAL(MINI + 1, CheckedAdd(T{-1}, MINI + 2).value());
BOOST_CHECK_EQUAL(MINI, SaturatingAdd(T{0}, MINI));
BOOST_CHECK_EQUAL(MINI, SaturatingAdd(T{-1}, MINI + 1));
BOOST_CHECK_EQUAL(MINI + 1, SaturatingAdd(T{-1}, MINI + 2));
BOOST_CHECK_EQUAL(-1, SaturatingAdd(MINI, MAXI));
}
BOOST_AUTO_TEST_CASE(util_overflow)