I ran this simple example:
#include <stdlib.h>
#include <stdio.h>
int fib(int AnArg) {
if (AnArg <= 2) return (1);
return (fib(AnArg-1)+fib(AnArg-2));
}
int main(int argc, char* argv[]) {
int n = atoi(argv[1]);
printf("fib(%i)=%i\n", n, fib(n));
}
through system gcc and gcc built from sources. Both are 4.2.1. Options: -O3.
Average runtime with the argument 45 is quite different: system gcc is
3.650s and gcc-4.2.1 from sources is 3.740.
CPU: Intel(R) Core(TM) i7 CPU @ 9200 @ 2.67GHz
Yuri
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