nobu	2015-11-18 16:09:27 +0900 (Wed, 18 Nov 2015)

  New Revision: 52634

  http://svn.ruby-lang.org/cgi-bin/viewvc.cgi?view=revision&revision=52634

  Log:
    comment for r52633 [ci skip]

  Modified files:
    trunk/compile.c
Index: compile.c
===================================================================
--- compile.c	(revision 52633)
+++ compile.c	(revision 52634)
@@ -2032,6 +2032,23 @@ iseq_peephole_optimize(rb_iseq_t *iseq, https://github.com/ruby/ruby/blob/trunk/compile.c#L2032
 		replace_destination(iobj, nobj);
 	    }
 	    else if (pobj) {
+		/*
+		 *   putnil
+		 *   if L1
+		 * =>
+		 *   # nothing
+		 *
+		 *   putobject true
+		 *   if L1
+		 * =>
+		 *   jump L1
+		 *
+		 *   putstring ".."
+		 *   if L1
+		 * =>
+		 *   jump L1
+		 *
+		 */
 		int cond;
 		if (pobj->insn_id == BIN(putobject)) {
 		    cond = (iobj->insn_id == BIN(branchif) ?

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