[all-commits] [llvm/llvm-project] ae0967: [CodeGen][SVE] CopyToReg: Split scalable EVTs that...

[sdesmalen-arm via All-commits]

  Branch: refs/heads/master
  Home:   https://github.com/llvm/llvm-project
  Commit: ae09670ee4de461669fc9f09b146ba0a5f0935fb
      https://github.com/llvm/llvm-project/commit/ae09670ee4de461669fc9f09b146ba0a5f0935fb
  Author: Sander de Smalen <sander.desmalen at arm.com>
  Date:   2020-06-08 (Mon, 08 Jun 2020)

  Changed paths:
    M llvm/lib/CodeGen/TargetLoweringBase.cpp
    A llvm/test/CodeGen/AArch64/sve-breakdown-scalable-vectortype.ll

  Log Message:
  -----------
  [CodeGen][SVE] CopyToReg: Split scalable EVTs that are not powers of 2

Scalable vectors cannot use 'BUILD_VECTOR', so it is necessary to
properly split and widen scalable vectors when passing them
to CopyToReg/CopyFromReg.

This functionality is added to TargetLoweringBase::getVectorTypeBreakdown().

This patch only adds support for 'splitting' scalable vectors that
are a multiple of some legal type, e.g.

      <vscale x 6 x i64> -> 3 x <vscale x 2 x i64>

Reviewers: efriedma, c-rhodes

Reviewed By: efriedma

Tags: #llvm

Differential Revision: https://reviews.llvm.org/D80139