[PATCH] D150599: [ARC] Use backwards scavenging in frame index elimination

[Jay Foad via Phabricator via llvm-commits]

foad created this revision.
foad added a reviewer: marksl.
Herald added subscribers: StephenFan, arphaman, hiraditya.
Herald added a project: All.
foad requested review of this revision.
Herald added a project: LLVM.
Herald added a subscriber: llvm-commits.

This is preferred because it does not rely on accurate kill flags.


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D150599

Files:
  llvm/lib/Target/ARC/ARCRegisterInfo.h


Index: llvm/lib/Target/ARC/ARCRegisterInfo.h
===================================================================
--- llvm/lib/Target/ARC/ARCRegisterInfo.h
+++ llvm/lib/Target/ARC/ARCRegisterInfo.h
@@ -39,6 +39,8 @@
 
   bool useFPForScavengingIndex(const MachineFunction &MF) const override;
 
+  bool supportsBackwardScavenger() const override { return true; }
+
   bool eliminateFrameIndex(MachineBasicBlock::iterator II, int SPAdj,
                            unsigned FIOperandNum,
                            RegScavenger *RS = nullptr) const override;


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