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Fix abs(nan) handling #1259

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Nov 21, 2025
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Fix abs(nan) handling #1259

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9 changes: 8 additions & 1 deletion include/boost/decimal/detail/cmath/abs.hpp
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Original file line number Diff line number Diff line change
Expand Up @@ -22,7 +22,14 @@ BOOST_DECIMAL_EXPORT template <typename T>
constexpr auto abs BOOST_DECIMAL_PREVENT_MACRO_SUBSTITUTION (const T rhs) noexcept
BOOST_DECIMAL_REQUIRES(detail::is_decimal_floating_point_v, T)
{
return signbit(rhs) ? -rhs : rhs;
if (BOOST_DECIMAL_LIKELY(!isnan(rhs)))
{
return signbit(rhs) ? -rhs : rhs;
}
else
{
return issignaling(rhs) ? nan_conversion(rhs) : rhs;
}
}

} // namespace decimal
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