[PATCH] SelectionDAG: mimic InstCombine when comparing to undef

[Mehdi AMINI]

Thanks, this was my impression as well, I’ll try to write a test and a patch for InstCombine, and then I’ll come back to SelectionDAG.

(good catch for N2, I'll try to have a test that stress this as well)


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http://reviews.llvm.org/D7602

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