From 11e09dc5dbd6ddaabf145bbee62741f4191eca79 Mon Sep 17 00:00:00 2001
From: dearblue <dearblue@users.noreply.github.com>
Date: Sat, 22 Jun 2019 23:09:36 +0900
Subject: Fix the unnecessary `mrb_str_modify()` call

Now to be calls `mrb_str_modify()` only once when 2 or more characters.
---
 src/string.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/src/string.c b/src/string.c
index 2cfdc337e..2d9d176d4 100644
--- a/src/string.c
+++ b/src/string.c
@@ -1710,11 +1710,13 @@ mrb_str_reverse_bang(mrb_state *mrb, mrb_value str)
       str_reverse(p, p + clen - 1);
       p += clen;
     }
+    goto bytes;
   }
 #endif
 
-  mrb_str_modify(mrb, s);
   if (RSTR_LEN(s) > 1) {
+    mrb_str_modify(mrb, s);
+   bytes:
     p = RSTR_PTR(s);
     e = p + RSTR_LEN(s) - 1;
     str_reverse(p, e);
-- 
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