Benchmarking llvm-gcc and gcc

I just compiled llvm-gcc (4.2.1 with LLVM 2.6svn) and did some benchmarking. Given a naive implementation of the Fibonacci sequence (fib.c):

#include <stdio.h>

unsigned long int fib(int n) {
   if (n < 3)
       return 1;    
   return fib(n-2) + fib(n-1);
} 

int main() {
   int i;
   for (i=1; i < 46; i++)
       printf("fib(%d) = %ld\n", i, fib(i));
   return 0;
}

Then we compile with -O3:

llvm-gcc -O3 fib.c -o fib-llvm-gcc
gcc -O3 fib.c -o fib-gcc

And the results:

time ./fib-llvm-gcc
real 0m3.053s
user 0m3.052s
sys 0m0.000s

time ./fib-gcc
real 0m11.176s
user 0m11.173s
sys 0m0.004s

That is something.

What comes to code size (both in x86 assembly), the faster is also the smaller:

wc fib-llvm-gcc.S
108 288 1900 fib-llvm-gcc.S

wc fib-gcc.S
291 738 4485 fib-gcc.S