[Bug tree-optimization/19516] missed optimization (bool)

["law at redhat dot com" <gcc-bugzilla at gcc dot gnu dot org>]

------- Additional Comments From law at redhat dot com  2005-02-14 21:05 -------
Note the new jump thread selection code will catch this case.  We get the
following code:

  # BLOCK 0
  # PRED: ENTRY [100.0%]  (fallthru,exec)
  #   VUSE <TMT.0_7>;
  D.1134_2 = *flag_1;
  if (D.1134_2 != 0) goto <L0>; else goto <L3>;
  # SUCC: 1 [46.5%]  (true,exec) 3 [53.5%]  (false,exec)

  # BLOCK 1
  # PRED: 0 [46.5%]  (true,exec)
<L0>:;
  #   TMT.0_9 = V_MAY_DEF <TMT.0_7>;
  bar ();
  #   VUSE <TMT.0_9>;
  D.1134_14 = *flag_1;
  if (D.1134_14 != 0) goto <L2>; else goto <L3>;
  # SUCC: 2 [46.5%]  (true,exec) 3 [53.5%]  (false,exec)

  # BLOCK 2
  # PRED: 1 [46.5%]  (true,exec)
<L2>:;
  #   TMT.0_8 = V_MAY_DEF <TMT.0_9>;
  bar ();
  # SUCC: 3 [100.0%]  (fallthru,exec)

  # BLOCK 3   # PRED: 1 [53.5%]  (false,exec) 2 [100.0%]  (fallthru,exec) 0
[53.5%]  (false,exec)
<L3>:;
  return;


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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=19516