[all-commits] [llvm/llvm-project] 993c1a: [AArch64][SVE] Teach copyPhysReg to copy ZPR2/3/4.

[Eli Friedman via All-commits]

  Branch: refs/heads/master
  Home:   https://github.com/llvm/llvm-project
  Commit: 993c1a3219a8ae69f1d700183bf174d75f3815d4
      https://github.com/llvm/llvm-project/commit/993c1a3219a8ae69f1d700183bf174d75f3815d4
  Author: Eli Friedman <efriedma at quicinc.com>
  Date:   2020-07-23 (Thu, 23 Jul 2020)

  Changed paths:
    M llvm/lib/Target/AArch64/AArch64InstrInfo.cpp
    A llvm/test/CodeGen/AArch64/sve-copy-zprpair.mir

  Log Message:
  -----------
  [AArch64][SVE] Teach copyPhysReg to copy ZPR2/3/4.

It's sort of tricky to hit this in practice, but not impossible. I have
a synthetic C testcase if anyone is interested.

The implementation is identical to the equivalent NEON register copies.

Differential Revision: https://reviews.llvm.org/D84373