Benjamin Kramer b16bd77bd2 InstCombine: Add a combine that turns (2^n)-1 ^ x back into (2^n)-1 - x iff x is smaller than 2^n and it fuses with a following add. ...

This was intended to undo the sub canonicalization in cases where it's not profitable, but it also
finds some cases on it's own.

llvm-svn: 147256

2011-12-24 17:31:53 +00:00

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