Make sure we don't emit instructions before a landingpad instruction.

PR14782

llvm-svn: 171846

1 files changed, 6 insertions, 1 deletions

diff --git a/llvm/lib/Transforms/Utils/DemoteRegToStack.cpp b/llvm/lib/Transforms/Utils/DemoteRegToStack.cpp
index ee59e946551..d5c41f54594 100644
--- a/llvm/lib/Transforms/Utils/DemoteRegToStack.cpp
+++ b/llvm/lib/Transforms/Utils/DemoteRegToStack.cpp
@@ -124,7 +124,12 @@ AllocaInst *llvm::DemotePHIToStack(PHINode *P, Instruction *AllocaPoint) {
   }
 
   // Insert a load in place of the PHI and replace all uses.
-  Value *V = new LoadInst(Slot, P->getName()+".reload", P);
+  BasicBlock::iterator InsertPt = P;
+
+  for (; isa<PHINode>(InsertPt) || isa<LandingPadInst>(InsertPt); ++InsertPt)
+    /* empty */;   // Don't insert before PHI nodes or landingpad instrs.
+
+  Value *V = new LoadInst(Slot, P->getName()+".reload", InsertPt);
   P->replaceAllUsesWith(V);
 
   // Delete PHI.