[PATCH] D70267: [X86][SSE] Simplify extract(shuffle(load())) handling (PR43971)

[Simon Pilgrim via Phabricator via llvm-commits]

RKSimon created this revision.
RKSimon added reviewers: craig.topper, spatel, wolfgangp, deadalnix.
Herald added subscribers: dmgreen, hiraditya.
Herald added a project: LLVM.

PR43971 showed how XFormVExtractWithShuffleIntoLoad was relying on a later call to DAGCombiner::visitEXTRACT_VECTOR_ELT to succeed before the regenerated VECTOR_SHUFFLE was re-lowered to a target shuffle again.

This patch removes XFormVExtractWithShuffleIntoLoad entirely, avoiding the creation of the VECTOR_SHUFFLE, instead it uses combineExtractWithShuffle to extract directly from the load (stripping any bitcasts).


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D70267

Files:
  llvm/lib/Target/X86/X86ISelLowering.cpp
  llvm/test/CodeGen/X86/extractelement-load.ll

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