From cec53ff77e4885de5b1fb0e81f07166a04cb8d53 Mon Sep 17 00:00:00 2001
From: "Yukihiro \"Matz\" Matsumoto" <matz@ruby-lang.org>
Date: Fri, 25 Aug 2017 16:04:32 +0900
Subject: `Array#first` to treat 1 argument case specially to improve
 performance.

---
 src/array.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

(limited to 'src/array.c')

diff --git a/src/array.c b/src/array.c
index be6744724..3ccdd3262 100644
--- a/src/array.c
+++ b/src/array.c
@@ -931,9 +931,10 @@ mrb_ary_first(mrb_state *mrb, mrb_value self)
   struct RArray *a = mrb_ary_ptr(self);
   mrb_int size, alen = ARY_LEN(a);
 
-  if (mrb_get_args(mrb, "|i", &size) == 0) {
+  if (mrb->c->ci->argc == 0) {
     return (alen > 0)? ARY_PTR(a)[0]: mrb_nil_value();
   }
+  mrb_get_args(mrb, "|i", &size);
   if (size < 0) {
     mrb_raise(mrb, E_ARGUMENT_ERROR, "negative array size");
   }
-- 
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