[PATCH] D37388: [X86] Allow cross-lane permutations for sub targets supporting AVX2.

[Simon Pilgrim via Phabricator via llvm-commits]

RKSimon added a comment.

I've added the test case for PR34369 at https://reviews.llvm.org/rL312481 - please can you rebase?



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Comment at: lib/Target/X86/X86ISelLowering.cpp:12079
   // less expensive. The flags track whether the given lane contains an element
   // that crosses to another lane.
+  if (!Subtarget.hasAVX2()) {
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Update this comment to explain the AVX2 path


https://reviews.llvm.org/D37388