[PATCH] D58583: [X86][AVX] Pull out some INSERT_SUBVECTOR combines into a combineConcatVectorOps helper. NFCI

[Simon Pilgrim via Phabricator via llvm-commits]

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

A lot of the INSERT_SUBVECTOR combines can be more generally handled as if they have come from a CONCAT_VECTORS node.

I've been investigating adding a CONCAT_VECTORS combine to X86, but this is a much easier first step that avoids the issue of handling a number of pre-legalization issues that I've encountered.


Repository:
  rL LLVM

https://reviews.llvm.org/D58583

Files:
  lib/Target/X86/X86ISelLowering.cpp

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