Posted on May 17, 2011 at 14:04It is difficult to help you without more information. I suggest that you indicate the gcc version you are using and provide a compilable version of the code that includes the definitions of the macros you are using. Performance improvements may be possible with alternative definitions of those macros.
When evaluating speed it may even be important to know precisely which processor is being used, the clock speed, and other relevant settings (such as wait states).
Divisions by zero and numeric overflows are also not detected by your atan2 function. This could lead to some undesirable results.
