Why is std::sin() and std::cos() slower than sin() and cos()?

Question

Test code:

#include 
#include 

const int N = 4096;
const float PI = 3.1415926535897932384626;

float cosine[N][N];
float sine[N][         


        

Answer 1

Use -S flag in compiler command line and check the difference between assembler output. Maybe using namespace std; gives a lot of unused stuff in executable file.