re PR rtl-optimization/55315 (comparing address to constant is folded in cse)

2012-11-19  Tom de Vries  <tom@codesourcery.com>

	PR rtl-optimization/55315

	* rtlanal.c (nonzero_address_p): Don't assume a nonzero address plus a
	const is a nonzero address.

From-SVN: r193616

gcc/ChangeLog

+2012-11-19  Tom de Vries  <tom@codesourcery.com>
+
+	PR rtl-optimization/55315
+
+	* rtlanal.c (nonzero_address_p): Don't assume a nonzero address plus a
+	const is a nonzero address.
+
 2012-11-18  Sandra Loosemore  <sandra@codesourcery.com>
 
 	* doc/extend.texi: Use @smallexample consistently.  Add @noindent

gcc/rtlanal.c

@@ -392,10 +392,8 @@ nonzero_address_p (const_rtx x)
       return nonzero_address_p (XEXP (x, 0));
 
     case PLUS:
-      if (CONST_INT_P (XEXP (x, 1)))
-        return nonzero_address_p (XEXP (x, 0));
       /* Handle PIC references.  */
-      else if (XEXP (x, 0) == pic_offset_table_rtx
+      if (XEXP (x, 0) == pic_offset_table_rtx
 	       && CONSTANT_P (XEXP (x, 1)))
 	return true;
       return false;