diff --git a/llvm/lib/Target/WebAssembly/WebAssemblyISelDAGToDAG.cpp b/llvm/lib/Target/WebAssembly/WebAssemblyISelDAGToDAG.cpp
--- a/llvm/lib/Target/WebAssembly/WebAssemblyISelDAGToDAG.cpp
+++ b/llvm/lib/Target/WebAssembly/WebAssemblyISelDAGToDAG.cpp
@@ -51,8 +51,8 @@
                          "********** Function: "
                       << MF.getName() << '\n');
 
-    ForCodeSize = MF.getFunction().hasFnAttribute(Attribute::OptimizeForSize) ||
-                  MF.getFunction().hasFnAttribute(Attribute::MinSize);
+    ForCodeSize = MF.getFunction().hasOptSize();
+
     Subtarget = &MF.getSubtarget<WebAssemblySubtarget>();
     return SelectionDAGISel::runOnMachineFunction(MF);
   }