From b1aa345d4f691a9a9dce12226983539e98866a84 Mon Sep 17 00:00:00 2001
From: Richard Stallman <rms@gnu.org>
Date: Tue, 13 Apr 1993 20:33:27 +0000
Subject: [PATCH] Comment change.

From-SVN: r4130
---
 gcc/fold-const.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/gcc/fold-const.c b/gcc/fold-const.c
index 02d40275a70..a7994aead79 100644
--- a/gcc/fold-const.c
+++ b/gcc/fold-const.c
@@ -1628,6 +1628,9 @@ non_lvalue (x)
     {
       if (TREE_CODE (x) == INTEGER_CST && integer_zerop (x))
 	{
+	  /* Use NOP_EXPR instead of NON_LVALUE_EXPR
+	     so convert_for_assignment won't strip it.
+	     This is so this 0 won't be treated as a null pointer constant.  */
 	  result = build1 (NOP_EXPR, TREE_TYPE (x), x);
 	  TREE_CONSTANT (result) = TREE_CONSTANT (x);
 	  return result;