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Make DetectDeadLanes preserve CFG
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Authored by arsenm on Jun 1 2016, 8:53 AM.

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MatzeB

arsenm retitled this revision from to Make DetectDeadLanes preserve CFG.

arsenm updated this object.

arsenm added a reviewer: MatzeB.

arsenm added a subscriber: llvm-commits.

LGTM

This revision is now accepted and ready to land.Jun 14 2016, 4:20 PM

r272740

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lib/

CodeGen/

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	public:			public:
	bool runOnMachineFunction(MachineFunction &MF) override;			bool runOnMachineFunction(MachineFunction &MF) override;

	static char ID;			static char ID;
	DetectDeadLanes() : MachineFunctionPass(ID) {}			DetectDeadLanes() : MachineFunctionPass(ID) {}

	const char *getPassName() const override { return "Detect Dead Lanes"; }			const char *getPassName() const override { return "Detect Dead Lanes"; }

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

	private:			private:
	/// Add used lane bits on the register used by operand \p MO. This translates			/// Add used lane bits on the register used by operand \p MO. This translates
	/// the bitmask based on the operands subregister, and puts the register into			/// the bitmask based on the operands subregister, and puts the register into
	/// the worklist if any new bits were added.			/// the worklist if any new bits were added.
	void addUsedLanesOnOperand(const MachineOperand &MO, LaneBitmask UsedLanes);			void addUsedLanesOnOperand(const MachineOperand &MO, LaneBitmask UsedLanes);

	/// Given a bitmask \p UsedLanes for the used lanes on a def output of a			/// Given a bitmask \p UsedLanes for the used lanes on a def output of a
	/// COPY-like instruction determine the lanes used on the use operands			/// COPY-like instruction determine the lanes used on the use operands
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