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Improve handling of NANs in fdim

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This commit is contained in:
Matt Borland
2023-01-03 17:12:49 +01:00
parent 5ebeddef31
commit 6b48f06f07
1 changed files with 15 additions and 8 deletions
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23
include/boost/math/ccmath/fdim.hpp
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@@ -17,7 +17,7 @@ namespace boost::math::ccmath {
namespace detail {
template <typename T>
inline constexpr T fdim_impl(const T x, const T y) noexcept
constexpr T fdim_impl(const T x, const T y) noexcept
{
if (x <= y)
{
@@ -36,13 +36,20 @@ inline constexpr T fdim_impl(const T x, const T y) noexcept
} // Namespace detail
template <typename Real, std::enable_if_t<!std::is_integral_v<Real>, bool> = true>
inline constexpr Real fdim(Real x, Real y) noexcept
constexpr Real fdim(Real x, Real y) noexcept
{
if (BOOST_MATH_IS_CONSTANT_EVALUATED(x))
{
return boost::math::ccmath::isnan(x) ? std::numeric_limits<Real>::quiet_NaN() :
boost::math::ccmath::isnan(y) ? std::numeric_limits<Real>::quiet_NaN() :
boost::math::ccmath::detail::fdim_impl(x, y);
if (boost::math::ccmath::isnan(x))
{
return x;
}
else if (boost::math::ccmath::isnan(y))
{
return y;
}
return boost::math::ccmath::detail::fdim_impl(x, y);
}
else
{
@@ -52,7 +59,7 @@ inline constexpr Real fdim(Real x, Real y) noexcept
}
template <typename T1, typename T2>
inline constexpr auto fdim(T1 x, T2 y) noexcept
constexpr auto fdim(T1 x, T2 y) noexcept
{
if (BOOST_MATH_IS_CONSTANT_EVALUATED(x))
{
@@ -83,13 +90,13 @@ inline constexpr auto fdim(T1 x, T2 y) noexcept
}
}
inline constexpr float fdimf(float x, float y) noexcept
constexpr float fdimf(float x, float y) noexcept
{
return boost::math::ccmath::fdim(x, y);
}
#ifndef BOOST_MATH_NO_LONG_DOUBLE_MATH_FUNCTIONS
inline constexpr long double fdiml(long double x, long double y) noexcept
constexpr long double fdiml(long double x, long double y) noexcept
{
return boost::math::ccmath::fdim(x, y);
}