mrkn	2016-11-11 23:45:11 +0900 (Fri, 11 Nov 2016)

  New Revision: 56710

  https://svn.ruby-lang.org/cgi-bin/viewvc.cgi?view=revision&revision=56710

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

  Modified files:
    trunk/rational.c
Index: rational.c
===================================================================
--- rational.c	(revision 56709)
+++ rational.c	(revision 56710)
@@ -782,9 +782,9 @@ nurat_sub(VALUE self, VALUE other) https://github.com/ruby/ruby/blob/trunk/rational.c#L782
 	{
 	    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)) {

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