Check for valid use of subreg.

Oked by Richard Henderson.

From-SVN: r104649

gcc/ChangeLog

+2005-09-26    Fariborz Jahanian <fjahanian@apple.com>
+
+        * combine.c (make_extraction): Check for valid use of subreg.
+
 2005-09-26  Uros Bizjak  <uros@kss-loka.si>
 
 	PR target/24055

gcc/combine.c

@@ -6314,7 +6314,7 @@ make_extraction (enum machine_mode mode, rtx inner, HOST_WIDE_INT pos,
 
 		  /* Avoid creating invalid subregs, for example when
 		     simplifying (x>>32)&255.  */
-		  if (final_word >= GET_MODE_SIZE (inner_mode))
+		  if (!validate_subreg (tmode, inner_mode, inner, final_word))
 		    return NULL_RTX;
 
 		  new = gen_rtx_SUBREG (tmode, inner, final_word);