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Add a getUniqueExitBlock utility function, similar to getExitBlock,

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but for getUniqueExitBlocks.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@74145 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Dan Gohman 2009-06-25 00:09:57 +00:00
parent 6279cd85e9
commit a278f3f552
1 changed files with 10 additions and 0 deletions
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10
include/llvm/Analysis/LoopInfo.h
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@ -281,6 +281,16 @@ public:
} }
} }
/// getUniqueExitBlock - If getUniqueExitBlocks would return exactly one
/// block, return that block. Otherwise return null.
BlockT *getUniqueExitBlock() const {
SmallVector<BlockT*, 8> UniqueExitBlocks;
getUniqueExitBlocks(UniqueExitBlocks);
if (UniqueExitBlocks.size() == 1)
return UniqueExitBlocks[0];
return 0;
}
/// getLoopPreheader - If there is a preheader for this loop, return it. A /// getLoopPreheader - If there is a preheader for this loop, return it. A
/// loop has a preheader if there is only one edge to the header of the loop /// loop has a preheader if there is only one edge to the header of the loop
/// from outside of the loop. If this is the case, the block branching to the /// from outside of the loop. If this is the case, the block branching to the