[PATCH] D89483: [ARM][MachineOutliner] Emit more CFI instructions

[Momchil Velikov via Phabricator via llvm-commits]

chill created this revision.
chill added reviewers: paquette, yroux, efriedma.
Herald added subscribers: llvm-commits, danielkiss, hiraditya, kristof.beyls.
Herald added a project: LLVM.
chill requested review of this revision.

This patch make the outliner emit CFI instructions in a few more places:

- after LR is restored, but before the return in an outlined function
- around save/restore of LR to/from a register at calls to outlined functions
- around save/restore of LR to/from the stack at calls to outlined functions

The latter two only when the function does NOT spill LR.  If the function spills
LR, then outliner generated saves/restores around calls are not considered
interesting for unwinding the frame.


https://reviews.llvm.org/D89483

Files:
  llvm/lib/Target/ARM/ARMBaseInstrInfo.cpp
  llvm/lib/Target/ARM/ARMBaseInstrInfo.h
  llvm/test/CodeGen/ARM/machine-outliner-cfi-1.ll
  llvm/test/CodeGen/ARM/machine-outliner-cfi-2.ll
  llvm/test/CodeGen/ARM/machine-outliner-cfi-3.ll

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