Revert "Revert "Add a specialized instruction for `.nil?` calls""

This reverts commit a0980f2446c0db735b8ffeb37e241370c458a626.

Retry for macOS Mojave.

1 files changed, 14 insertions, 0 deletions

diff --git a/insns.def b/insns.def
index c971026cf6..7c93af6e4d 100644
--- a/insns.def
+++ b/insns.def
@@ -808,6 +808,20 @@ opt_str_freeze
     }
 }
 
+/* optimized nil? */
+DEFINE_INSN
+opt_nil_p
+(CALL_INFO ci, CALL_CACHE cc)
+(VALUE recv)
+(VALUE val)
+{
+    val = vm_opt_nil_p(ci, cc, recv);
+
+    if (val == Qundef) {
+        CALL_SIMPLE_METHOD();
+    }
+}
+
 DEFINE_INSN
 opt_str_uminus
 (VALUE str, CALL_INFO ci, CALL_CACHE cc)