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Add a comment about the additional meaning of setPreservesCFG() for

MachineFunctionPass passes.

llvm-svn: 78669
This commit is contained in:
Dan Gohman 2009-08-11 15:50:56 +00:00
parent 08e747855c
commit f610241b61

View File

@ -40,6 +40,10 @@ protected:
/// getAnalysisUsage - Subclasses that override getAnalysisUsage
/// must call this.
///
/// For MachineFunctionPasses, calling AU.preservesCFG() indicates that
/// the pass does not modify the MachineBasicBlock CFG.
///
virtual void getAnalysisUsage(AnalysisUsage &AU) const;
private: