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Update test of numext::signbit.

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This commit is contained in:
Rasmus Munk Larsen 2022-12-15 11:39:32 -08:00
parent 3717854a21
commit e1aee4ab39
1 changed files with 39 additions and 34 deletions
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41
test/numext.cpp
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@ -239,19 +239,6 @@ void check_rsqrt() {
check_rsqrt_impl<T>::run();
}
template <typename T, bool IsInteger = NumTraits<T>::IsInteger>
struct ref_signbit_func_impl {
static bool run(const T& x) { return std::signbit(x); }
};
template <typename T>
struct ref_signbit_func_impl<T, true> {
// MSVC (perhaps others) does not have a std::signbit overload for integers
static bool run(const T& x) { return x < T(0); }
};
template <typename T>
bool ref_signbit_func(const T& x) {
return ref_signbit_func_impl<T>::run(x);
}
template <typename T>
struct check_signbit_impl {
@ -261,6 +248,15 @@ struct check_signbit_impl {
T false_mask;
std::memset(static_cast<void*>(&false_mask), 0x00, sizeof(T));
std::vector<T> negative_values;
std::vector<T> non_negative_values;
if (NumTraits<T>::IsInteger) {
negative_values = {static_cast<T>(-1),
static_cast<T>(NumTraits<T>::lowest())};
non_negative_values = {static_cast<T>(0), static_cast<T>(1),
static_cast<T>(NumTraits<T>::highest())};
} else {
// has sign bit
const T neg_zero = static_cast<T>(-0.0);
const T neg_one = static_cast<T>(-1.0);
@ -271,18 +267,27 @@ struct check_signbit_impl {
const T pos_one = static_cast<T>(1.0);
const T pos_inf = std::numeric_limits<T>::infinity();
const T pos_nan = std::numeric_limits<T>::quiet_NaN();
negative_values = {neg_zero, neg_one, neg_inf, neg_nan};
non_negative_values = {pos_zero, pos_one, pos_inf, pos_nan};
}
std::vector<T> values = {neg_zero, neg_one, neg_inf, neg_nan, pos_zero, pos_one, pos_inf, pos_nan};
auto check_all = [](auto values, auto expected) {
bool all_pass = true;
for (T val : values) {
const T numext_val = numext::signbit(val);
const T ref_val = ref_signbit_func(val) ? true_mask : false_mask;
bool not_same = internal::predux_any(internal::bitwise_helper<T>::bitwise_xor(ref_val, numext_val));
bool not_same = internal::predux_any(
internal::bitwise_helper<T>::bitwise_xor(expected, numext_val));
all_pass = all_pass && !not_same;
if (not_same) std::cout << "signbit(" << val << ") != " << numext_val << "\n";
if (not_same)
std::cout << "signbit(" << val << ") = " << numext_val
<< " != " << expected << std::endl;
}
return all_pass;
};
bool all_pass = check_all(non_negative_values, false_mask);
all_pass = all_pass && check_all(negative_values, (NumTraits<T>::IsSigned ? true_mask : false_mask));
VERIFY(all_pass);
}
};