[all-commits] [llvm/llvm-project] 1975ff: [AArch64] Fix ldst-opt of multiple disjunct subregs.

[Florian Hahn via All-commits]

  Branch: refs/heads/master
  Home:   https://github.com/llvm/llvm-project
  Commit: 1975ff9a0a982233a9a38812cd5228428020772f
      https://github.com/llvm/llvm-project/commit/1975ff9a0a982233a9a38812cd5228428020772f
  Author: Florian Hahn <flo at fhahn.com>
  Date:   2020-06-08 (Mon, 08 Jun 2020)

  Changed paths:
    M llvm/lib/Target/AArch64/AArch64LoadStoreOptimizer.cpp
    M llvm/test/CodeGen/AArch64/stp-opt-with-renaming-ld3.mir

  Log Message:
  -----------
  [AArch64] Fix ldst-opt of multiple disjunct subregs.

Currently aarch64-ldst-opt will incorrectly rename registers with
multiple disjunct subregisters (e.g. result of LD3). This patch updates
the canRenameUpToDef to bail out if it encounters such a register class
that contains the register to rename.

Fixes PR46105.

Reviewers: efriedma, dmgreen, paquette, t.p.northover

Reviewed By: efriedma

Differential Revision: https://reviews.llvm.org/D81108