[PATCH] D37197: [X86] Make 128/256-bit extract_subvector Legal instead of Custom. Move combining with BUILD_VECTOR from Legalization to DAG combine

[Craig Topper via Phabricator via llvm-commits]

craig.topper created this revision.

EXTRACT_SUBVECTOR was marked Custom solely so we could combine it with BUILD_VECTOR operations to create smaller BUILD_VECTORS during Legalization. But that sort of combining should really be done by the DAG combiner.

This patch adds the last piece of needed supported DAG combine to handle this. Once that's done we can make the EXTRACT_SUBVECTOR operations Legal.


https://reviews.llvm.org/D37197

Files:
  lib/Target/X86/X86ISelLowering.cpp

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