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

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MachineFunctionPass passes.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@78669 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Dan Gohman 2009-08-11 15:50:56 +00:00
parent 004072508b
commit d1ad72f54f
1 changed files with 4 additions and 0 deletions
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4
include/llvm/CodeGen/MachineFunctionPass.h
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@ -40,6 +40,10 @@ protected:
/// getAnalysisUsage - Subclasses that override getAnalysisUsage /// getAnalysisUsage - Subclasses that override getAnalysisUsage
/// must call this. /// must call this.
///
/// For MachineFunctionPasses, calling AU.preservesCFG() indicates that
/// the pass does not modify the MachineBasicBlock CFG.
///
virtual void getAnalysisUsage(AnalysisUsage &AU) const; virtual void getAnalysisUsage(AnalysisUsage &AU) const;
private: private: