[PATCH] D78812: [SVE][CodeGen] Fix legalisation for scalable types

[Kerry McLaughlin via Phabricator via cfe-commits]

kmclaughlin created this revision.
kmclaughlin added reviewers: sdesmalen, efriedma, huntergr.
Herald added subscribers: psnobl, rkruppe, hiraditya, tschuett.
Herald added a project: LLVM.

This patch handles illegal scalable types when lowering IR operations,
addressing several places where the value of isScalableVector() is
ignored.

For types such as <vscale x 8 x i32>, this means splitting the
operations. In this example, we would split it into two
operations of type <vscale x 4 x i32> for the low and high halves.

In cases such as <vscale x 2 x i32>, the elements in the vector
will be promoted. In this case they will be promoted to
i64 (with a vector of type <vscale x 2 x i64>)


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D78812

Files:
  llvm/lib/CodeGen/SelectionDAG/SelectionDAGBuilder.cpp
  llvm/lib/CodeGen/TargetLoweringBase.cpp
  llvm/test/CodeGen/AArch64/llvm-ir-to-intrinsic.ll

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