Change llvm.gcroot to not init the root to null at runtime, this prevents

using it for live-in values etc.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@41879 91177308-0d34-0410-b5e6-96231b3b80d8

1 files changed, 1 insertions, 4 deletions

diff --git a/lib/Transforms/Scalar/LowerGC.cpp b/lib/Transforms/Scalar/LowerGC.cpp
index 98070995af..bac7ac799b 100644
--- a/lib/Transforms/Scalar/LowerGC.cpp
+++ b/lib/Transforms/Scalar/LowerGC.cpp
@@ -284,10 +284,7 @@ bool LowerGC::runOnFunction(Function &F) {
     new StoreInst(Null, RootPtrPtr, IP);
 
     // Each occurrance of the llvm.gcroot intrinsic now turns into an
-    // initialization of the slot with the address and a zeroing out of the
-    // address specified.
-    new StoreInst(Constant::getNullValue(PtrLocTy->getElementType()),
-                  GCRoots[i]->getOperand(1), GCRoots[i]);
+    // initialization of the slot with the address.
     new StoreInst(GCRoots[i]->getOperand(1), RootPtrPtr, GCRoots[i]);
   }