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);