[PATCH] D68226: [X86][AVX] Push sign extensions of comparison bool results through bitops (PR42025)

[Simon Pilgrim via Phabricator via llvm-commits]

RKSimon created this revision.
RKSimon added reviewers: craig.topper, spatel, lebedev.ri.
Herald added a subscriber: hiraditya.
Herald added a project: LLVM.

As discussed on PR42025, with more complex boolean math we can end up with many truncations/extensions of the comparison results through each bitop.

This patch handles the cases introduced in combineBitcastvxi1 by pushing the sign extension through the AND/OR/XOR ops so its just the original SETCC ops that gets extended.


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D68226

Files:
  llvm/lib/Target/X86/X86ISelLowering.cpp
  llvm/test/CodeGen/X86/bitcast-and-setcc-256.ll
  llvm/test/CodeGen/X86/bitcast-and-setcc-512.ll

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