[OpenCL] Add builtin function attribute handling

Add handling for the "pure", "const" and "convergent" function
attributes for OpenCL builtin functions.

Patch by Pierre Gondois and Sven van Haastregt.

Differential Revision: https://reviews.llvm.org/D64319

1 files changed, 10 insertions, 2 deletions

diff --git a/clang/lib/Sema/SemaLookup.cpp b/clang/lib/Sema/SemaLookup.cpp
index 3aedcdc66bc..44c9d276c3e 100644
--- a/clang/lib/Sema/SemaLookup.cpp
+++ b/clang/lib/Sema/SemaLookup.cpp
@@ -815,9 +815,17 @@ static void InsertOCLBuiltinDeclarationsFromTable(Sema &S, LookupResult &LR,
         }
         NewOpenCLBuiltin->setParams(ParmList);
       }
-      if (!S.getLangOpts().OpenCLCPlusPlus) {
+
+      // Add function attributes.
+      if (OpenCLBuiltin.IsPure)
+        NewOpenCLBuiltin->addAttr(PureAttr::CreateImplicit(Context));
+      if (OpenCLBuiltin.IsConst)
+        NewOpenCLBuiltin->addAttr(ConstAttr::CreateImplicit(Context));
+      if (OpenCLBuiltin.IsConv)
+        NewOpenCLBuiltin->addAttr(ConvergentAttr::CreateImplicit(Context));
+      if ((GenTypeMaxCnt > 1 || Len > 1) && !S.getLangOpts().OpenCLCPlusPlus)
         NewOpenCLBuiltin->addAttr(OverloadableAttr::CreateImplicit(Context));
-      }
+
       LR.addDecl(NewOpenCLBuiltin);
     }
   }