[PATCH] D29687: [TargetLowering] check for sign-bit comparisons in SimplifyDemandedBits

[Sanjay Patel via Phabricator via llvm-commits]

spatel updated this revision to Diff 87530.
spatel added a comment.

Patch updated:
I'm not sure how to expose this, but I think I was missing a check for BooleanContent::ZeroOrNegativeOneBooleanContent. If the target/type uses a different format for setcc, it probably wouldn't make sense to demand the top bit, but let's check that to be safe?


https://reviews.llvm.org/D29687

Files:
  lib/CodeGen/SelectionDAG/TargetLowering.cpp
  test/CodeGen/X86/vselect-pcmp.ll

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