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[Backport branch/3.4.x] [libcu++] Skip __fp_set_exp fpclassify tests on denormals #9557

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Merged
wmaxey merged 1 commit into from
Jun 23, 2026
Merged

[Backport branch/3.4.x] [libcu++] Skip __fp_set_exp fpclassify tests on denormals #9557

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8 changes: 8 additions & 0 deletions libcudacxx/test/libcudacxx/libcxx/numerics/floating.point/decompose/set_exp.pass.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -65,7 +65,11 @@ TEST_FUNC _CCCL_CONSTEXPR_BIT_CAST void test_fp_set_exp(T val)
assert(!cuda::std::isnan(res));
assert(!cuda::std::isinf(res));
assert(cuda::std::isfinite(res));
// NVHPC flushes subnormals to 0 by default on some architectures. That causes this check to fail, because we use
// __builtin_fpclassify to implement fpclassify. Re-enable once nvbug 6303102 is resolved.
#if !TEST_COMPILER(NVHPC)
assert(cuda::std::fpclassify(res) == FP_SUBNORMAL);
#endif // !TEST_COMPILER(NVHPC)
}

if constexpr (cuda::std::__fp_has_denorm_v<fmt> && cuda::std::__fp_is_signed_v<fmt>)
Expand All @@ -75,7 +79,11 @@ TEST_FUNC _CCCL_CONSTEXPR_BIT_CAST void test_fp_set_exp(T val)
assert(!cuda::std::isnan(res));
assert(!cuda::std::isinf(res));
assert(cuda::std::isfinite(res));
// NVHPC flushes subnormals to 0 by default on some architectures. That causes this check to fail, because we use
// __builtin_fpclassify to implement fpclassify. Re-enable once nvbug 6303102 is resolved.
#if !TEST_COMPILER(NVHPC)
assert(cuda::std::fpclassify(res) == FP_SUBNORMAL);
#endif // !TEST_COMPILER(NVHPC)
}
}

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