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Add a comment about the additional meaning of setPreservesCFG() for
MachineFunctionPass passes. llvm-svn: 78669
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@ -40,6 +40,10 @@ protected:
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/// getAnalysisUsage - Subclasses that override getAnalysisUsage
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/// must call this.
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///
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/// For MachineFunctionPasses, calling AU.preservesCFG() indicates that
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/// the pass does not modify the MachineBasicBlock CFG.
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///
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virtual void getAnalysisUsage(AnalysisUsage &AU) const;
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private:
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