[OpenCL] Enabling the usage of CLK_NULL_QUEUE as compare operand.

Summary: Enabling the compression of CLK_NULL_QUEUE to variable of type queue_t.

Reviewers: Anastasia

Subscribers: cfe-commits, yaxunl, bader

Differential Revision: https://reviews.llvm.org/D27569

llvm-svn: 290171

1 files changed, 12 insertions, 0 deletions

diff --git a/clang/lib/Sema/SemaExpr.cpp b/clang/lib/Sema/SemaExpr.cpp
index b8883456911..3c554c9a524 100644
--- a/clang/lib/Sema/SemaExpr.cpp
+++ b/clang/lib/Sema/SemaExpr.cpp
@@ -9635,6 +9635,18 @@ QualType Sema::CheckCompareOperands(ExprResult &LHS, ExprResult &RHS,
     return ResultTy;
   }
 
+  if (getLangOpts().OpenCLVersion >= 200) {
+    if (LHSIsNull && RHSType->isQueueT()) {
+      LHS = ImpCastExprToType(LHS.get(), RHSType, CK_NullToPointer);
+      return ResultTy;
+    }
+
+    if (LHSType->isQueueT() && RHSIsNull) {
+      RHS = ImpCastExprToType(RHS.get(), LHSType, CK_NullToPointer);
+      return ResultTy;
+    }
+  }
+
   return InvalidOperands(Loc, LHS, RHS);
 }