rtl.c (rtx_equal_p): Check for null pointers when comparing rtx strings.

	* rtl.c (rtx_equal_p): Check for null pointers when comparing rtx
	strings.

From-SVN: r47785

2 files changed, 8 insertions, 1 deletions

diff --git a/gcc/ChangeLog b/gcc/ChangeLog
index b07ac1b..792a400 100644
--- a/gcc/ChangeLog
+++ b/gcc/ChangeLog
@@ -1,3 +1,8 @@
+2001-12-08  John David Anglin  <dave@hiauly1.hia.nrc.ca>
+
+	* rtl.c (rtx_equal_p): Check for null pointers when comparing rtx
+	strings.
+
 2001-12-07  Richard Henderson  <rth@redhat.com>
 
 	* doc/extend.texi: Fix typo last change.
diff --git a/gcc/rtl.c b/gcc/rtl.c
index 3e73e4b..4d97bbd 100644
--- a/gcc/rtl.c
+++ b/gcc/rtl.c
@@ -670,7 +670,9 @@ rtx_equal_p (x, y)
 
 	case 'S':
 	case 's':
-	  if (strcmp (XSTR (x, i), XSTR (y, i)))
+	  if ((XSTR (x, i) || XSTR (y, i))
+	      && (! XSTR (x, i) || ! XSTR (y, i)
+		  || strcmp (XSTR (x, i), XSTR (y, i))))
 	    return 0;
 	  break;