1 files changed, 11 insertions, 2 deletions
diff --git a/clang/lib/AST/Expr.cpp b/clang/lib/AST/Expr.cpp
index 6da11c1cab8..8516d41df6c 100644
--- a/clang/lib/AST/Expr.cpp
+++ b/clang/lib/AST/Expr.cpp
@@ -1256,15 +1256,24 @@ bool Expr::isConstantInitializer(ASTContext &Ctx) const {
   }
   case ImplicitValueInitExprClass:
     return true;
-  case ParenExprClass: {
+  case ParenExprClass:
     return cast<ParenExpr>(this)->getSubExpr()->isConstantInitializer(Ctx);
-  }
   case UnaryOperatorClass: {
     const UnaryOperator* Exp = cast<UnaryOperator>(this);
     if (Exp->getOpcode() == UnaryOperator::Extension)
       return Exp->getSubExpr()->isConstantInitializer(Ctx);
     break;
   }
+  case BinaryOperatorClass: {
+    // Special case &&foo - &&bar.  It would be nice to generalize this somehow
+    // but this handles the common case.
+    const BinaryOperator *Exp = cast<BinaryOperator>(this);
+    if (Exp->getOpcode() == BinaryOperator::Sub &&
+        isa<AddrLabelExpr>(Exp->getLHS()->IgnoreParenNoopCasts(Ctx)) &&
+        isa<AddrLabelExpr>(Exp->getRHS()->IgnoreParenNoopCasts(Ctx)))
+      return true;
+    break;
+  }
   case ImplicitCastExprClass:
   case CStyleCastExprClass:
     // Handle casts with a destination that's a struct or union; this