[PATCH] D89048: [ARM][LowOverheadLoops] Insert loop start at end of block in more cases

[Sam Tebbs via Phabricator via llvm-commits]

samtebbs created this revision.
samtebbs added reviewers: SjoerdMeijer, dmgreen, simon_tatham, olista01, t.p.northover, samparker.
Herald added subscribers: llvm-commits, danielkiss, hiraditya, kristof.beyls.
Herald added a project: LLVM.
samtebbs requested review of this revision.

There are some cases where the loop start instruction isn't inserted at the end of the basic block where it could be. This patch allows it to be as long as the def of the count reg and lr is the same at the end as at the previous insertion point.


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D89048

Files:
  llvm/lib/Target/ARM/ARMLowOverheadLoops.cpp
  llvm/test/CodeGen/Thumb2/LowOverheadLoops/ctlz-non-zeros.mir
  llvm/test/CodeGen/Thumb2/LowOverheadLoops/dls-kills-reg.mir
  llvm/test/CodeGen/Thumb2/LowOverheadLoops/inloop-vpnot-1.mir
  llvm/test/CodeGen/Thumb2/LowOverheadLoops/inloop-vpnot-2.mir
  llvm/test/CodeGen/Thumb2/LowOverheadLoops/inloop-vpnot-3.mir
  llvm/test/CodeGen/Thumb2/LowOverheadLoops/inloop-vpsel-1.mir
  llvm/test/CodeGen/Thumb2/LowOverheadLoops/inloop-vpsel-2.mir
  llvm/test/CodeGen/Thumb2/LowOverheadLoops/invariant-qreg.mir
  llvm/test/CodeGen/Thumb2/LowOverheadLoops/it-block-chain-store.mir
  llvm/test/CodeGen/Thumb2/LowOverheadLoops/it-block-mov.mir
  llvm/test/CodeGen/Thumb2/LowOverheadLoops/mov-after-dlstp.mir
  llvm/test/CodeGen/Thumb2/LowOverheadLoops/mov-operand.ll
  llvm/test/CodeGen/Thumb2/LowOverheadLoops/safe-retaining.mir
  llvm/test/CodeGen/Thumb2/LowOverheadLoops/unpredicated-max.mir
  llvm/test/CodeGen/Thumb2/LowOverheadLoops/unsafe-retaining.mir
  llvm/test/CodeGen/Thumb2/LowOverheadLoops/vaddv.mir
  llvm/test/CodeGen/Thumb2/LowOverheadLoops/vctp-add-operand-liveout.mir
  llvm/test/CodeGen/Thumb2/LowOverheadLoops/wrong-vctp-operand-liveout.mir
  llvm/test/CodeGen/Thumb2/mve-gather-increment.ll

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