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Date: Mon, 20 Dec 2004 19:04:00 -0000
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From: "pinskia at gcc dot gnu dot org" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug tree-optimization/19038] [4.0 Regression] out-of ssa causing loops to have more than one BB
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------- Additional Comments From pinskia at gcc dot gnu dot org  2004-12-20 19:04 -------
The reduced testcase (well heavely modified) looks like:
int
f (int temp2, int temp3, int xlvj_, int zlvj_, int yv1j_, int yv2j_)
{
  int temp1, temp5;

  for(;;) {
    temp1 = temp2*xlvj_ - temp3*zlvj_;
    temp3 = temp2*zlvj_ + temp3*xlvj_;
    temp5 = temp2;
    temp2 = temp1;
    if (temp3)
      break;
  }
  return yv1j_ * yv2j_;
}

Before the tree-ssa we would produce one BB when creating RTL but after out of ssa produces an extra 
BB to hold "  temp2 = temp1;"

-- 


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=19038