[Bug tree-optimization/40321] [4.4/4.5 Regression] internal compiler error: in compute_antic, at tree-ssa-pre.c:2501

[rguenth at gcc dot gnu dot org]

------- Comment #21 from rguenth at gcc dot gnu dot org  2009-07-15 12:54 -------
Correction - only b_2 is missing from the maximal set, a_1 is there because
it is used in non-PHI nodes.  The fix indeed looks quite obvious to me now ...

For reference, here is the function before PRE again:

<bb 2>:

<bb 3>:
  # a_1 = PHI <a_3(D)(2), b_2(6)>
  # b_2 = PHI <b_4(D)(2), a_1(6)>
  D.1251_5 = a_1->flag;
  if (D.1251_5 != 0)
    goto <bb 5>;
  else
    goto <bb 6>;

<bb 6>:
  goto <bb 3>;

<bb 5>:

<bb 4>:
  # a_14 = PHI <a_1(5)>
  # b_15 = PHI <b_2(5)>
  D.1254_10 = a_14->pos;
  D.1255_11 = b_15->pos;
  D.1253_12 = D.1255_11 + D.1254_10;
  return D.1253_12;


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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=40321