performance-type-promotion-in-math-fn

Finds calls to C math library functions (from math.h or, in C++, cmath) with implicit float to double promotions.

For example, warns on ::sin(0.f), because this funciton’s parameter is a double. You probably meant to call std::sin(0.f) (in C++), or sinf(0.f) (in C).

float a;
asin(a);

// becomes

float a;
std::asin(a);