[PATCH] DAGCombiner: fold (xor (shl 1, x), -1) -> (rotl -2, x)

Meador Inge meadori at gmail.com
Tue Mar 17 10:34:53 PDT 2015

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FWIW, the logic seems straight forward to me too.  LGTM.


http://reviews.llvm.org/D8350

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