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Add tests to check that isnan doesn't cause FP errors

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Alex Dewar 2024-05-02 14:54:23 +01:00 committed by Victor Zverovich
parent 8a8f4825a3
commit 9234fe83f9
1 changed files with 20 additions and 0 deletions
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20
test/format-test.cc
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@ -15,6 +15,7 @@
#include <stdint.h> // uint32_t
#include <cfenv> // fegetexceptflag and FE_ALL_EXCEPT
#include <climits> // INT_MAX
#include <cmath> // std::signbit
#include <condition_variable> // std::condition_variable
@ -109,6 +110,14 @@ TEST(float_test, isfinite) {
#endif
}
void check_no_fp_exception() {
fexcept_t fe;
fegetexceptflag(&fe, FE_ALL_EXCEPT);
// No exception flags should have been set
EXPECT_TRUE(fe == 0);
}
template <typename Float> void check_isnan() {
using fmt::detail::isnan;
EXPECT_FALSE(isnan(Float(0.0)));
@ -121,6 +130,17 @@ template <typename Float> void check_isnan() {
EXPECT_FALSE(isnan(Float(-limits::infinity())));
EXPECT_TRUE(isnan(Float(limits::quiet_NaN())));
EXPECT_TRUE(isnan(Float(-limits::quiet_NaN())));
// Sanity check: make sure no error has occurred before we start
check_no_fp_exception();
// Check that no exception is raised for the non-NaN case
isnan(Float(42.0));
check_no_fp_exception();
// Check that no exception is raised for the NaN case
isnan(Float(limits::quiet_NaN()));
check_no_fp_exception();
}
TEST(float_test, isnan) {