optimized compilation

[Jiri Masik]

Hi,

please have a look at the following code if it is correct or not. It
produces strange result when compiled with -O2 on current
Debian/powerpc (with g++ Version: 1:2.95.2-7)
Thanks,
        Jiri

#include <stdio.h>

int ap(int i);
int main(void){
  int ir[4] = {0,1,2,3};
  int ix,n,m,res;
  n=1; m=3;
  for (ix=1;ix<=4;ix++) {
    if (n == 1) m = 4;
    else        m = n-1;
    printf("n:%d m:%d\n",n,m);
    res = ap(ir[n-1]);
    n = m;
  }
}

int ap(int i){
  printf("i: %d\n",i);
  return 1;
}

g++ -O2 loop.cxx

n:1 m:4
i: 0
n:4 m:3
i: 268437040
n:3 m:2
i: 2147481792
n:2 m:1
i: 1

g++ loop.cxx
n:1 m:4
i: 0
n:4 m:3
i: 3
n:3 m:2
i: 2
n:2 m:1
i: 1