[PATCH] D79587: [CodeGen][SVE] Legalisation of extends with scalable types

[Kerry McLaughlin via Phabricator via cfe-commits]

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

This patch adds legalisation of extensions where the operand
of the extend is a legal scalable type but the result is not.

In these cases we can try to use the [S|U]UNPK[HI|LO] operations
to extend each half individually and concatenate the result.

For example:

  zext <vscale x 16 x i8> %a to <vscale x 16 x i16>

should emit:

  uunpklo z2.h, z0.b
  uunpkhi z1.h, z0.b

Patch by Richard Sandiford


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D79587

Files:
  llvm/lib/Target/AArch64/AArch64ISelLowering.cpp
  llvm/lib/Target/AArch64/AArch64ISelLowering.h
  llvm/test/CodeGen/AArch64/llvm-ir-to-intrinsic.ll
  llvm/test/CodeGen/AArch64/sve-arith.ll
  llvm/test/CodeGen/AArch64/sve-ext.ll

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