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util: Add SaturatingAdd helper

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This commit is contained in:
MarcoFalke
2022-02-01 13:43:42 +01:00
parent 1337b93f50
commit faa7d8a3f7
3 changed files with 48 additions and 5 deletions
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17
src/test/fuzz/addition_overflow.cpp
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@@ -26,6 +26,12 @@ void TestAdditionOverflow(FuzzedDataProvider& fuzzed_data_provider)
const T i = fuzzed_data_provider.ConsumeIntegral<T>();
const T j = fuzzed_data_provider.ConsumeIntegral<T>();
const bool is_addition_overflow_custom = AdditionOverflow(i, j);
const auto maybe_add{CheckedAdd(i, j)};
const auto sat_add{SaturatingAdd(i, j)};
assert(is_addition_overflow_custom == !maybe_add.has_value());
assert(is_addition_overflow_custom == AdditionOverflow(j, i));
assert(maybe_add == CheckedAdd(j, i));
assert(sat_add == SaturatingAdd(j, i));
#if defined(HAVE_BUILTIN_ADD_OVERFLOW)
T result_builtin;
const bool is_addition_overflow_builtin = __builtin_add_overflow(i, j, &result_builtin);
@@ -33,11 +39,14 @@ void TestAdditionOverflow(FuzzedDataProvider& fuzzed_data_provider)
if (!is_addition_overflow_custom) {
assert(i + j == result_builtin);
}
#else
if (!is_addition_overflow_custom) {
(void)(i + j);
}
#endif
if (is_addition_overflow_custom) {
assert(sat_add == std::numeric_limits<T>::min() || sat_add == std::numeric_limits<T>::max());
} else {
const auto add{i + j};
assert(add == maybe_add.value());
assert(add == sat_add);
}
}
} // namespace