🚀 go-pugleaf

Robert Salasidis <salasidis@medcor.mcgill.ca> wrote:
: All games that are worth anything use absolutely zero floating point in critical 
: areas. Floating point is too inefficient, and integers are used exclusively 
: (this is for all games that require real time action).

Sure? You know that some compiler optimize code by using the FPU for integer
calculations? How about the following code?

----------------
#include <stdio.h>

#define COUNT 101


main()
{
   double a=0;
   unsigned int i,j;
   double b[COUNT];

   for (i=0;i<COUNT;i++)
      b[i]=i;

   for (j=0;j<4000000;j++) {
      for (i=0;i<COUNT-1;i++)
	 a+=b[i]*b[i+1];
   }
   printf("%d: %d\n",j,a);
}
--------------------------------

On a Pentium, changing a and b to be "int" rather than "double" slows it
down. And that is despite "int" being 32 bits while "double" is 64 bits.
Change the "*" to "/", and using the FPU is _still_ faster.

Bernie

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