[Bug tree-optimization/42586] SRA does not always work

[pinskia at gcc dot gnu dot org]

------- Comment #5 from pinskia at gcc dot gnu dot org  2010-01-03 06:35 -------
4.5 has:
  _T2 = *sptr_1(D);
  _T2$curr_14 = sptr_1(D)->curr;
  _ans = _T2;
  D.2697_7 = _T2$curr_14 + -1;
  *sptr_1(D) = _ans;
  sptr_1(D)->curr = D.2697_7;

While 4.4 does:
  _T2$base = sptr->base;
  D.1587 = sptr->curr + -1;
  sptr->last_plus_one = sptr->last_plus_one;
  sptr->base = _T2$base;
  sptr->curr = D.1587;


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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=42586