[Bug tree-optimization/21000] store should not be done if we don't change its value

[pinskia at gcc dot gnu dot org]

------- Additional Comments From pinskia at gcc dot gnu dot org  2005-04-13 
19:18 -------
One more thing, we miss a sibcal optimization due to this:
int i;
int g(void) __attribute__((pure));
int f()
{
  int t = i;
  int t1 = g();
  i = t;
  return t1;
}

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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=21000