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Chris Lattner 9763859e8d Remove explicit check for: not (not X) = X, it is already handled because xor is commutative 
- InstCombine: (X & C1) ^ C2 --> (X & C1) | C2 iff (C1&C2) == 0
  - InstCombine: (X | C1) ^ C2 --> (X | C1) & ~C2 iff (C1&C2) == C2

llvm-svn: 7282
 		2003-07-23 21:37:07 +00:00
llvm Remove explicit check for: not (not X) = X, it is already handled because xor is commutative 2003-07-23 21:37:07 +00:00