@@ -26,12 +26,12 @@
 .macro generate_lookup name not_found
 \name:
 	testq	%rdi, %rdi
 	jz	ret_nil
 
-	btl	$0, %edi
-	jc	.Ltagged_pointer_\name
+	testb	$1, %dil
+	jnz	.Ltagged_pointer_\name
 
 	movq	(%rdi), %r8
 	movq	64(%r8), %r8
 
 .Lmain_\name: