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Add a getExitBlock utility function to LoopInfo which returns the

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exit block of a loop, if there is exactly one, similar to
getExitingBlock.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@71245 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Dan Gohman 2009-05-08 20:07:23 +00:00
parent 0269d3cbf3
commit 1827e8263c
1 changed files with 10 additions and 0 deletions
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10
include/llvm/Analysis/LoopInfo.h
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@ -213,6 +213,16 @@ public:
ExitBlocks.push_back(*I); ExitBlocks.push_back(*I);
} }
/// getExitBlock - If getExitBlocks would return exactly one block,
/// return that block. Otherwise return null.
BlockT *getExitBlock() const {
SmallVector<BlockT*, 8> ExitBlocks;
getExitBlocks(ExitBlocks);
if (ExitBlocks.size() == 1)
return ExitBlocks[0];
return 0;
}
/// getUniqueExitBlocks - Return all unique successor blocks of this loop. /// getUniqueExitBlocks - Return all unique successor blocks of this loop.
/// These are the blocks _outside of the current loop_ which are branched to. /// These are the blocks _outside of the current loop_ which are branched to.
/// This assumes that loop is in canonical form. /// This assumes that loop is in canonical form.