Second attempt at PR12573:

Allow the "SplitCriticalEdge" function to split the edge to a landing pad. If
the pass is *sure* that it thinks it knows what it's doing, then it may go ahead
and specify that the landing pad can have its critical edge split. The loop
unswitch pass is one of these passes. It will split the critical edges of all
edges coming from a loop to a landing pad not within the loop. Doing so will
retain important loop analysis information, such as loop simplify.

llvm-svn: 155817

1 files changed, 2 insertions, 1 deletions

diff --git a/llvm/include/llvm/Transforms/Utils/BasicBlockUtils.h b/llvm/include/llvm/Transforms/Utils/BasicBlockUtils.h
index 867b9e43849..2f9dc54541b 100644
--- a/llvm/include/llvm/Transforms/Utils/BasicBlockUtils.h
+++ b/llvm/include/llvm/Transforms/Utils/BasicBlockUtils.h
@@ -110,7 +110,8 @@ bool isCriticalEdge(const TerminatorInst *TI, unsigned SuccNum,
 ///
 BasicBlock *SplitCriticalEdge(TerminatorInst *TI, unsigned SuccNum,
                               Pass *P = 0, bool MergeIdenticalEdges = false,
-                              bool DontDeleteUselessPHIs = false);
+                              bool DontDeleteUselessPHIs = false,
+                              bool SplitLandingPads = false);
 
 inline BasicBlock *SplitCriticalEdge(BasicBlock *BB, succ_iterator SI,
                                      Pass *P = 0) {