From 0797e4720f4fa94605f883a60027956600f92908 Mon Sep 17 00:00:00 2001
From: Tom Tromey <tromey@redhat.com>
Date: Tue, 11 Jun 2002 22:36:53 +0000
Subject: For PR java/6520:

	* fold-const.c (fold_convert): Don't modify existing tree's type.

From-SVN: r54529
---
 gcc/fold-const.c | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

(limited to 'gcc/fold-const.c')

diff --git a/gcc/fold-const.c b/gcc/fold-const.c
index db41564..1c29ad5 100644
--- a/gcc/fold-const.c
+++ b/gcc/fold-const.c
@@ -1596,8 +1596,10 @@ fold_convert (t, arg1)
 	{
 	  if (REAL_VALUE_ISNAN (TREE_REAL_CST (arg1)))
 	    {
-	      t = arg1;
-	      TREE_TYPE (arg1) = type;
+	      /* We make a copy of ARG1 so that we don't modify an
+		 existing constant tree.  */
+	      t = copy_node (arg1);
+	      TREE_TYPE (t) = type;
 	      return t;
 	    }
 
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