1 files changed, 26 insertions, 0 deletions
diff --git a/js/src/jit/CodeGenerator.cpp b/js/src/jit/CodeGenerator.cpp
index 7b2f8214ba..16d0260929 100644
--- a/js/src/jit/CodeGenerator.cpp
+++ b/js/src/jit/CodeGenerator.cpp
@@ -11529,6 +11529,32 @@ CodeGenerator::visitHasClass(LHasClass* ins)
 }
 
 void
+CodeGenerator::visitGuardToClass(LGuardToClass* ins)
+{
+    Register lhs = ToRegister(ins->lhs());
+    Register output = ToRegister(ins->output());
+    Register temp = ToRegister(ins->temp());
+
+    Label notEqual;
+
+    masm.branchTestObjClass(Assembler::NotEqual, lhs, temp, ins->mir()->getClass(), &notEqual);
+    masm.mov(lhs, output);
+
+    if (ins->mir()->type() == MIRType::Object) {
+        // Can't return null-return here, so bail
+        bailoutFrom(&notEqual, ins->snapshot());
+    } else {
+        Label done;
+        masm.jump(&done);
+
+        masm.bind(&notEqual);
+        masm.mov(ImmPtr(0), output);
+
+        masm.bind(&done);
+    }
+}
+
+void
 CodeGenerator::visitWasmParameter(LWasmParameter* lir)
 {
 }