[PATCH] D86548: [SVE][CodeGen] Legalisation of truncate for scalable vectors

[Kerry McLaughlin via Phabricator via llvm-commits]

kmclaughlin created this revision.
kmclaughlin added reviewers: sdesmalen, efriedma, david-arm, paulwalker-arm.
Herald added subscribers: llvm-commits, psnobl, hiraditya, kristof.beyls, tschuett.
Herald added a reviewer: rengolin.
Herald added a project: LLVM.
kmclaughlin requested review of this revision.

Truncating from an illegal SVE type to a legal type, e.g.
`trunc <vscale x 4 x i64> %in to <vscale x 4 x i32>`
fails after PromoteIntOp_CONCAT_VECTORS attempts to
create a BUILD_VECTOR.

This patch changes the promote function to create a pair of
INSERT_SUBVECTORs if the return type is scalable, and replaces
these with UZP1 for AArch64.


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D86548

Files:
  llvm/lib/CodeGen/SelectionDAG/LegalizeIntegerTypes.cpp
  llvm/lib/Target/AArch64/AArch64ISelLowering.cpp
  llvm/test/CodeGen/AArch64/sve-split-trunc.ll

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