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[block-freq] Add a method to loop info for returning all loop latches for a specific loop.

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We already have a method for returning one loop latch but for some
reason no one has committed one for returning loop latches in the case
where there are multiple latches.

llvm-svn: 195410
This commit is contained in:
Michael Gottesman 2013-11-22 05:00:48 +00:00
parent a50f9e81f3
commit 0af557806f
1 changed files with 12 additions and 0 deletions
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12
include/llvm/Analysis/LoopInfo.h
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@ -228,6 +228,18 @@ public:
/// A latch block is a block that contains a branch back to the header. /// A latch block is a block that contains a branch back to the header.
BlockT *getLoopLatch() const; BlockT *getLoopLatch() const;
/// getLoopLatches - Return all loop latch blocks of this loop. A latch block
/// is a block that contains a branch back to the header.
void getLoopLatches(SmallVectorImpl<BlockT *> &LoopLatches) const {
BlockT *H = getHeader();
typedef GraphTraits<Inverse<BlockT*> > InvBlockTraits;
for (typename InvBlockTraits::ChildIteratorType I =
InvBlockTraits::child_begin(H),
E = InvBlockTraits::child_end(H); I != E; ++I)
if (contains(*I))
LoopLatches.push_back(*I);
}
//===--------------------------------------------------------------------===// //===--------------------------------------------------------------------===//
// APIs for updating loop information after changing the CFG // APIs for updating loop information after changing the CFG
// //