[PATCH] D37947: [X86] Fix two more places to prefer VPERMQ/PD over VPERM2X128 when AVX2 is enabled

[Simon Pilgrim via Phabricator via llvm-commits]

RKSimon added inline comments.


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Comment at: lib/Target/X86/X86ISelLowering.cpp:12150
+                          Flipped, DAG.getConstant(PERMMask, DL, MVT::i8));
+  }
   Flipped = DAG.getBitcast(VT, Flipped);
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What happens if we just replace this with a generic DAG.getVectorShuffle? I'm thinking about when we finally get around to supporting 512-bit in lowerVectorShuffleAsLanePermuteAndBlend.


https://reviews.llvm.org/D37947