[PATCH] D92230: [SVE][CodeGen] Add DAG combines for s/zext_masked_gather

[Kerry McLaughlin via Phabricator via llvm-commits]

kmclaughlin created this revision.
kmclaughlin added reviewers: sdesmalen, efriedma, craig.topper.
Herald added subscribers: llvm-commits, ecnelises, steven.zhang, psnobl, hiraditya, tschuett.
Herald added a project: LLVM.
kmclaughlin requested review of this revision.

This patch adds the following DAGCombines, which apply if isVectorLoadExtDesirable() returns true:

- fold (and (masked_gather x)) -> (zext_masked_gather x)
- fold (sext_inreg (masked_gather x)) -> (sext_masked_gather x)

LowerMGATHER has also been updated to fetch the LoadExtType associated with the
gather and also use this value to determine the correct masked gather opcode to use.


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D92230

Files:
  llvm/lib/CodeGen/SelectionDAG/DAGCombiner.cpp
  llvm/lib/Target/AArch64/AArch64ISelLowering.cpp
  llvm/test/CodeGen/AArch64/sve-masked-gather-legalize.ll

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