[PATCH] D68374: [X86] Add v32i8 shuffle lowering strategy to recognize two v4i64 vectors truncated to v4i8 and concatenated into the lower 8 bytes with undef/zero upper bytes.

[Craig Topper via Phabricator via llvm-commits]

craig.topper updated this revision to Diff 223050.
craig.topper added a comment.

Use simpler checks instead of loops.


CHANGES SINCE LAST ACTION
  https://reviews.llvm.org/D68374/new/

https://reviews.llvm.org/D68374

Files:
  llvm/lib/Target/X86/X86ISelLowering.cpp
  llvm/test/CodeGen/X86/min-legal-vector-width.ll
  llvm/test/CodeGen/X86/shuffle-vs-trunc-512.ll

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