[Bug tree-optimization/96336] Multiple multiplications fails to optimize

[fazedo at gmail dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=96336

--- Comment #1 from Fabio Azevedo <fazedo at gmail dot com> ---
int f(int x) {
  return x*x*x*x*x*x*x*x*x*x*x*x*x*x*x*x; //x**16 
} 

int g(int x) {
  return x*x*x*x*x*x*x*x*x*x*x*x*x*x*x*x + x*x; //x**16 + x**2
}


Using gcc -O3, the first function simplifies to 4 integer multiplications while
the second function requires 13.