[PATCH] D86158: [X86][AVX] Fold store(extract_element(vtrunc)) to truncated store

[Simon Pilgrim via Phabricator via llvm-commits]

RKSimon created this revision.
RKSimon added reviewers: craig.topper, spatel.
Herald added a subscriber: hiraditya.
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RKSimon requested review of this revision.

Add handling for X86ISD::VTRUNC nodes that the (lower) truncated bits are then extracted as an element and the element stored out - this can be lowered to a generic truncated store directly.


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D86158

Files:
  llvm/lib/Target/X86/X86ISelLowering.cpp
  llvm/test/CodeGen/X86/shuffle-vs-trunc-128.ll
  llvm/test/CodeGen/X86/shuffle-vs-trunc-256.ll
  llvm/test/CodeGen/X86/shuffle-vs-trunc-512.ll

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