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-rw-r--r--vm_insnhelper.h2
1 files changed, 1 insertions, 1 deletions
diff --git a/vm_insnhelper.h b/vm_insnhelper.h
index 6e931e1622..1d2bdafdad 100644
--- a/vm_insnhelper.h
+++ b/vm_insnhelper.h
@@ -180,7 +180,7 @@ extern VALUE ruby_vm_redefined_flag;
/* optimize insn */
#define FIXNUM_2_P(a, b) ((a) & (b) & 1)
-#define BASIC_OP_UNREDEFINED_P(op) ((ruby_vm_redefined_flag & (op)) == 0)
+#define BASIC_OP_UNREDEFINED_P(op) (LIKELY((ruby_vm_redefined_flag & (op)) == 0))
#define HEAP_CLASS_OF(obj) RBASIC(obj)->klass
#define CALL_SIMPLE_METHOD(num, id, recv) do { \