Index: lib/Target/AMDGPU/AMDGPULibFunc.cpp
===================================================================
--- lib/Target/AMDGPU/AMDGPULibFunc.cpp
+++ lib/Target/AMDGPU/AMDGPULibFunc.cpp
@@ -995,8 +995,10 @@
   } else {
     AttributeList Attr;
     LLVMContext &Ctx = M->getContext();
-    Attr.addAttribute(Ctx, AttributeList::FunctionIndex, Attribute::ReadOnly);
-    Attr.addAttribute(Ctx, AttributeList::FunctionIndex, Attribute::NoUnwind);
+    Attr = Attr.addAttribute(Ctx, AttributeList::FunctionIndex,
+                             Attribute::ReadOnly);
+    Attr = Attr.addAttribute(Ctx, AttributeList::FunctionIndex,
+                             Attribute::NoUnwind);
     C = M->getOrInsertFunction(FuncName, FuncTy, Attr);
   }
 
Index: test/CodeGen/AMDGPU/simplify-libcalls.ll
===================================================================
--- test/CodeGen/AMDGPU/simplify-libcalls.ll
+++ test/CodeGen/AMDGPU/simplify-libcalls.ll
@@ -783,5 +783,10 @@
   ret void
 }
 
+; GCN-PRELINK: declare float @_Z4fabsf(float) local_unnamed_addr #[[NOUNWIND_READONLY:[0-9]+]]
+; GCN-PRELINK: declare float @_Z4cbrtf(float) local_unnamed_addr #[[NOUNWIND_READONLY]]
+; GCN-PRELINK: declare float @_Z11native_sqrtf(float) local_unnamed_addr #[[NOUNWIND_READONLY]]
+
 ; CGN-PRELINK: attributes #[[$NOUNWIND]] = { nounwind }
+; GCN-PRELINK: attributes #[[NOUNWIND_READONLY]] = { nounwind readonly }
 attributes #0 = { nounwind }