PruneEH: Only merge attribute sets when used. No functionality change.

llvm-svn: 184041

1 files changed, 5 insertions, 7 deletions

diff --git a/llvm/lib/Transforms/IPO/PruneEH.cpp b/llvm/lib/Transforms/IPO/PruneEH.cpp
index 73d9323195b..89529dee110 100644
--- a/llvm/lib/Transforms/IPO/PruneEH.cpp
+++ b/llvm/lib/Transforms/IPO/PruneEH.cpp
@@ -145,15 +145,13 @@ bool PruneEH::runOnSCC(CallGraphSCC &SCC) {
         NewAttributes.addAttribute(Attribute::NoReturn);
 
       Function *F = (*I)->getFunction();
-      const AttributeSet &PAL = F->getAttributes();
-      const AttributeSet &NPAL =
-        PAL.addAttributes(F->getContext(), AttributeSet::FunctionIndex,
-                          AttributeSet::get(F->getContext(),
-                                            AttributeSet::FunctionIndex,
-                                            NewAttributes));
+      const AttributeSet &PAL = F->getAttributes().getFnAttributes();
+      const AttributeSet &NPAL = AttributeSet::get(
+          F->getContext(), AttributeSet::FunctionIndex, NewAttributes);
+
       if (PAL != NPAL) {
         MadeChange = true;
-        F->setAttributes(NPAL);
+        F->addAttributes(AttributeSet::FunctionIndex, NPAL);
       }
     }