nobu	2015-09-24 14:20:32 +0900 (Thu, 24 Sep 2015)

  New Revision: 51926

  http://svn.ruby-lang.org/cgi-bin/viewvc.cgi?view=revision&revision=51926

  Log:
    file.c: same timespec
    
    * file.c (rb_file_s_utime): same timespec for same time object.
      assume time objects are static.

  Modified files:
    trunk/file.c
Index: file.c
===================================================================
--- file.c	(revision 51925)
+++ file.c	(revision 51926)
@@ -2686,7 +2686,10 @@ rb_file_s_utime(int argc, VALUE *argv) https://github.com/ruby/ruby/blob/trunk/file.c#L2686
     if (!NIL_P(args.atime) || !NIL_P(args.mtime)) {
 	tsp = tss;
 	tsp[0] = rb_time_timespec(args.atime);
-	tsp[1] = rb_time_timespec(args.mtime);
+	if (args.atime == args.mtime)
+	    tsp[1] = tsp[0];
+	else
+	    tsp[1] = rb_time_timespec(args.mtime);
     }
     args.tsp = tsp;
 

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