compile.c: tailcall in conditinal block

* compile.c (iseq_peephole_optimize): enable tail call
  optimization inside a conditional block.

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@56208 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

ChangeLog

@@ -1,3 +1,8 @@
+Fri Sep 23 12:15:29 2016  Nobuyoshi Nakada  <nobu@ruby-lang.org>
+
+	* compile.c (iseq_peephole_optimize): enable tail call
+	  optimization inside a conditional block.
+
 Thu Sep 22 13:00:04 2016  Kazuhiro NISHIYAMA  <zn@mbf.nifty.com>
 
 	* gc.c (gc_start_internal): [DOC] methods without arguments

compile.c

@@ -2281,6 +2281,13 @@ iseq_peephole_optimize(rb_iseq_t *iseq, LINK_ELEMENT *list, const int do_tailcal
 		  /*case BIN(trace):*/
 		    next = next->next;
 		    break;
+		  case BIN(jump):
+		    /* if cond
+		     *   return tailcall
+		     * end
+		     */
+		    next = get_destination_insn((INSN *)next);
+		    break;
 		  case BIN(leave):
 		    piobj = iobj;
 		  default: