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[PostRAMachineSink] preserve CFG
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Authored by junbuml on Mar 23 2018, 1:39 PM.

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Summary

Mark CFG is preserved since this pass do not make any change in CFG.

LGTM!

This revision is now accepted and ready to land.Mar 23 2018, 1:54 PM

This revision was automatically updated to reflect the committed changes.

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lib/

CodeGen/

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	class PostRAMachineSinking : public MachineFunctionPass {			class PostRAMachineSinking : public MachineFunctionPass {
	public:			public:
	bool runOnMachineFunction(MachineFunction &MF) override;			bool runOnMachineFunction(MachineFunction &MF) override;

	static char ID;			static char ID;
	PostRAMachineSinking() : MachineFunctionPass(ID) {}			PostRAMachineSinking() : MachineFunctionPass(ID) {}
	StringRef getPassName() const override { return "PostRA Machine Sink"; }			StringRef getPassName() const override { return "PostRA Machine Sink"; }

				void getAnalysisUsage(AnalysisUsage &AU) const override {
				AU.setPreservesCFG();
				MachineFunctionPass::getAnalysisUsage(AU);
				}

	private:			private:
	/// Track which registers have been modified and used.			/// Track which registers have been modified and used.
	BitVector ModifiedRegs, UsedRegs;			BitVector ModifiedRegs, UsedRegs;

	/// Sink Copy instructions unused in the same block close to their uses in			/// Sink Copy instructions unused in the same block close to their uses in
	/// successors.			/// successors.
	bool tryToSinkCopy(MachineBasicBlock &BB, MachineFunction &MF,			bool tryToSinkCopy(MachineBasicBlock &BB, MachineFunction &MF,
	const TargetRegisterInfo TRI, const TargetInstrInfo TII);			const TargetRegisterInfo TRI, const TargetInstrInfo TII);
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