[all-commits] [llvm/llvm-project] 6ec5f3: [ARM][LowOverheadLoops] Iteration count liveness

[Sam Parker via All-commits]

  Branch: refs/heads/master
  Home:   https://github.com/llvm/llvm-project
  Commit: 6ec5f324973dfbe7b4a489593dde5073ff63ff64
      https://github.com/llvm/llvm-project/commit/6ec5f324973dfbe7b4a489593dde5073ff63ff64
  Author: Sam Parker <sam.parker at arm.com>
  Date:   2020-10-01 (Thu, 01 Oct 2020)

  Changed paths:
    M llvm/lib/Target/ARM/ARMLowOverheadLoops.cpp
    M llvm/test/CodeGen/Thumb2/LowOverheadLoops/it-block-chain-store.mir
    M llvm/test/CodeGen/Thumb2/LowOverheadLoops/mov-after-dlstp.mir
    M llvm/test/CodeGen/Thumb2/LowOverheadLoops/mov-operand.ll

  Log Message:
  -----------
  [ARM][LowOverheadLoops] Iteration count liveness

Before deciding to insert a [W|D]LSTP, check that defining LR with
the element count won't affect any other instructions that should be
taking the iteration count.

Differential Revision: https://reviews.llvm.org/D88549