From 40b0dd1ce11393f87c92938417cc79f4dc0ee416 Mon Sep 17 00:00:00 2001
From: nobu <nobu@b2dd03c8-39d4-4d8f-98ff-823fe69b080e>
Date: Wed, 18 Nov 2015 07:09:27 +0000
Subject: comment for r52633 [ci skip]

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@52634 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
---
 compile.c | 17 +++++++++++++++++
 1 file changed, 17 insertions(+)

(limited to 'compile.c')

diff --git a/compile.c b/compile.c
index ae900fbf31..2b4add1c16 100644
--- a/compile.c
+++ b/compile.c
@@ -2032,6 +2032,23 @@ iseq_peephole_optimize(rb_iseq_t *iseq, LINK_ELEMENT *list, const int do_tailcal
 		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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