From b848f3c7e1f1d6ded0ccc1e045b58f5cdccfb9b5 Mon Sep 17 00:00:00 2001
From: mrkn <mrkn@b2dd03c8-39d4-4d8f-98ff-823fe69b080e>
Date: Fri, 11 Nov 2016 14:45:11 +0000
Subject: [PATCH] rational.c: optimize rational - integer

* rational.c (nurat_sub): optimize rational - integer.
  Author: Tadashi Saito <tad.a.digger@gmail.com>

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@56710 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
---
 rational.c | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/rational.c b/rational.c
index 5be862bd54..909a7fc397 100644
--- a/rational.c
+++ b/rational.c
@@ -782,9 +782,9 @@ nurat_sub(VALUE self, VALUE other)
 	{
 	    get_dat1(self);
 
-	    return f_addsub(self,
-			    dat->num, dat->den,
-			    other, ONE, '-');
+	    return f_rational_new_no_reduce2(CLASS_OF(self),
+					     rb_int_minus(dat->num, rb_int_mul(other, dat->den)),
+					     dat->den);
 	}
     }
     else if (RB_TYPE_P(other, T_FLOAT)) {