Check for NULL return from gen_lowpart_if_possible().

From-SVN: r23049

gcc/ChangeLog

+Tue Oct 13 11:37:45 1998  Nick Clifton  <nickc@cygnus.com>
+
+	* cse.c (equiv_constant): Check for NULL return from
+	gen_lowpart_if_possible().
+
 Tue Oct 13 11:24:51 1998  Jeffrey A Law  (law@cygnus.com)
 
 	* collect2.c (main): Pass -EL/-EB through to the compiler.

gcc/cse.c

@@ -5860,7 +5860,7 @@ equiv_constant (x)
       && qty_const[reg_qty[REGNO (x)]])
     x = gen_lowpart_if_possible (GET_MODE (x), qty_const[reg_qty[REGNO (x)]]);
 
-  if (x != 0 && CONSTANT_P (x))
+  if (x == 0 || CONSTANT_P (x))
     return x;
 
   /* If X is a MEM, try to fold it outside the context of any insn to see if