Expose isCriticalEdge & SplitCriticalEdge methods from crit-edges pass

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@4075 91177308-0d34-0410-b5e6-96231b3b80d8

1 files changed, 16 insertions, 0 deletions

diff --git a/include/llvm/Transforms/Scalar.h b/include/llvm/Transforms/Scalar.h
index 3161d68..1ade0f4 100644
--- a/include/llvm/Transforms/Scalar.h
+++ b/include/llvm/Transforms/Scalar.h
@@ -11,6 +11,7 @@
 class Pass;
 class GetElementPtrInst;
 class PassInfo;
+class TerminatorInst;
 
 //===----------------------------------------------------------------------===//
 //
@@ -188,6 +189,21 @@ Pass *createCFGSimplificationPass();
 Pass *createBreakCriticalEdgesPass();
 extern const PassInfo *BreakCriticalEdgesID;
 
+// The BreakCriticalEdges pass also exposes some low-level functionality that
+// may be used by other passes.
+
+/// isCriticalEdge - Return true if the specified edge is a critical edge.
+/// Critical edges are edges from a block with multiple successors to a block
+/// with multiple predecessors.
+///
+bool isCriticalEdge(const TerminatorInst *TI, unsigned SuccNum);
+
+/// SplitCriticalEdge - Insert a new node node to split the critical edge.  This
+/// will update DominatorSet, ImmediateDominator and DominatorTree information
+/// if a pass is specified, thus calling this pass will not invalidate these
+/// analyses.
+///
+void SplitCriticalEdge(TerminatorInst *TI, unsigned SuccNum, Pass *P = 0);
 
 //===----------------------------------------------------------------------===//
 //