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-rw-r--r--src/unittest/test_serialization.cpp13
1 files changed, 13 insertions, 0 deletions
diff --git a/src/unittest/test_serialization.cpp b/src/unittest/test_serialization.cpp
index b526792c4..ca4116413 100644
--- a/src/unittest/test_serialization.cpp
+++ b/src/unittest/test_serialization.cpp
@@ -674,6 +674,19 @@ void TestSerialization::testFloatFormat()
return;
}
+ // The code below compares the IEEE conversion functions with a
+ // known good IEC559/IEEE754 implementation. This test neeeds
+ // IEC559 compliance in the compiler.
+#if defined(__GNUC__) && (!defined(__STDC_IEC_559__) || defined(__FAST_MATH__))
+ // GNU C++ lies about its IEC559 support when -ffast-math is active.
+ // https://gcc.gnu.org/bugzilla//show_bug.cgi?id=84949
+ bool is_iec559 = false;
+#else
+ bool is_iec559 = std::numeric_limits<f32>::is_iec559;
+#endif
+ if (!is_iec559)
+ return;
+
auto test_single = [&fs, &fm](const u32 &i) -> bool {
memcpy(&fm, &i, 4);
fs = u32Tof32Slow(i);