[CGP] Check that we have an insert point before moving llvm.dbg.value around

llvm-svn: 255055

1 files changed, 8 insertions, 4 deletions

diff --git a/llvm/lib/CodeGen/CodeGenPrepare.cpp b/llvm/lib/CodeGen/CodeGenPrepare.cpp
index d619044e86c..615bcf33767 100644
--- a/llvm/lib/CodeGen/CodeGenPrepare.cpp
+++ b/llvm/lib/CodeGen/CodeGenPrepare.cpp
@@ -5251,12 +5251,16 @@ bool CodeGenPrepare::placeDbgValues(Function &F) {
 
       Instruction *VI = dyn_cast_or_null<Instruction>(DVI->getValue());
       if (VI && VI != PrevNonDbgInst && !VI->isTerminator()) {
-        DEBUG(dbgs() << "Moving Debug Value before :\n" << *DVI << ' ' << *VI);
-        DVI->removeFromParent();
+        BasicBlock::iterator IP;
         if (isa<PHINode>(VI))
-          DVI->insertBefore(&*VI->getParent()->getFirstInsertionPt());
+          IP = VI->getParent()->getFirstInsertionPt();
         else
-          DVI->insertAfter(VI);
+          IP = ++VI->getIterator();
+        if (IP == VI->getParent()->end())
+          continue;
+        DEBUG(dbgs() << "Moving Debug Value before :\n" << *DVI << ' ' << *VI);
+        DVI->removeFromParent();
+        VI->getParent()->getInstList().insert(IP, DVI);
         MadeChange = true;
         ++NumDbgValueMoved;
       }