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Incomplete Gamma: Restore previous overflow check

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Kilian Kilger
2025-04-29 09:57:58 +02:00
parent 5a30520951
commit 0d6ff719b1
1 changed files with 2 additions and 11 deletions
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13
include/boost/math/special_functions/gamma.hpp
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@@ -1657,22 +1657,13 @@ BOOST_MATH_GPU_ENABLED T gamma_incomplete_imp_final(T a, T x, bool normalised, b
}
if(p_derivative)
{
/*
* We can never reach this:
if((x < 1) && (tools::max_value<T>() * x < *p_derivative))
if((x == 0) || ((x < 1) && (tools::max_value<T>() * x < *p_derivative)))
{
// overflow, just return an arbitrarily large value:
*p_derivative = tools::max_value<T>() / 2;
}
*/
BOOST_MATH_ASSERT((x >= 1) || (tools::max_value<T>() * x >= *p_derivative));
//
// Need to convert prefix term to derivative:
//
if (x > 0)
else
*p_derivative /= x;
else
*p_derivative = tools::max_value<T>() / 2;
}
return result;