Do not split edges to EH landing pads. It will cause code size explosion.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@66140 91177308-0d34-0410-b5e6-96231b3b80d8

1 files changed, 6 insertions, 0 deletions

diff --git a/lib/Transforms/Scalar/CodeGenPrepare.cpp b/lib/Transforms/Scalar/CodeGenPrepare.cpp
index 1f3a13cc9c..85e57661c1 100644
--- a/lib/Transforms/Scalar/CodeGenPrepare.cpp
+++ b/lib/Transforms/Scalar/CodeGenPrepare.cpp
@@ -327,6 +327,12 @@ static void SplitEdgeNicely(TerminatorInst *TI, unsigned SuccNum,
   assert(isa<PHINode>(Dest->begin()) &&
          "This should only be called if Dest has a PHI!");
 
+  // Do not split edges to EH landing pads.
+  if (InvokeInst *Invoke = dyn_cast<InvokeInst>(TI)) {
+    if (Invoke->getSuccessor(1) == Dest)
+      return;
+  }
+
   // As a hack, never split backedges of loops.  Even though the copy for any
   // PHIs inserted on the backedge would be dead for exits from the loop, we
   // assume that the cost of *splitting* the backedge would be too high.