For the latest documentation on Visual Studio 2017 RC, see Visual Studio 2017 RC Documentation.
Calculates the arctangent of x / y where x and y are values on the top of the stack.
void __cdecl _CIatan2();
This version of the
atan2 function has a specialized calling convention that the compiler understands. It speeds up the execution because it prevents copies from being generated and helps with register allocation.
The resulting value is pushed onto the top of the stack.