MachineBasicBlock::SplitCriticalEdge() should follow LLVM IR variant and refuse to break edge to EH landing pad. rdar://11300144
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@155470 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/CodeGen/MachineBasicBlock.cpp b/lib/CodeGen/MachineBasicBlock.cpp
index 1abb8f2..cf88525 100644
--- a/lib/CodeGen/MachineBasicBlock.cpp
+++ b/lib/CodeGen/MachineBasicBlock.cpp
@@ -596,6 +596,11 @@
MachineBasicBlock *
MachineBasicBlock::SplitCriticalEdge(MachineBasicBlock *Succ, Pass *P) {
+ // Splitting the critical edge to a landing pad block is non-trivial. Don't do
+ // it in this generic function.
+ if (Succ->isLandingPad())
+ return NULL;
+
MachineFunction *MF = getParent();
DebugLoc dl; // FIXME: this is nowhere