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Date: Sat, 20 Nov 2004 17:11:00 -0000
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From: "steven at gcc dot gnu dot org" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug tree-optimization/18576] missing jump threading because of type changes
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------- Additional Comments From steven at gcc dot gnu dot org  2004-11-20 17:11 -------
Situation in DOM3:  
  
  # BLOCK 4  
  # PRED: 3 [100.0%]  (fallthru,exec) 2 [81.0%]  (true,exec) 1 [50.0%]   
(true,exec)  
  # iftmp.0_1 = PHI <0(2), 1(3), 0(1)>;  
<L4>:;  
  D.1171_13 = (unsigned char) iftmp.0_1;  
  D.1160_14 = (int) D.1171_13;  
  D.1145_16 = (unsigned char) D.1160_14;  
  if (D.1145_16 != 0) goto <L8>; else goto <L7>;  
  # SUCC: 6 [33.0%]  (true,exec) 5 [67.0%]  (false,exec)  
  
So this is almost certainly casts again getting in the way.  
  

-- 


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=18576