fix subreg optimization bug introduced 2002-05-25

fix subreg optimization bug introduced 2002-05-25
	* combine.c (simplify_set): When optimizing a subreg src with a
	cc0 dest, use GET_MODE (src) for mask instead of inner_mode.

From-SVN: r57323

gcc/ChangeLog

+2002-09-19  Jim Wilson  <wilson@redhat.com>
+
+	* combine.c (simplify_set): When optimizing a subreg src with a
+	cc0 dest, use GET_MODE (src) for mask instead of inner_mode.
+
 2002-09-19  Dale Johannesen <dalej@apple.com>
 	* combine.c (make_extraction): Don't create
 	invalid subreg.

gcc/combine.c

@@ -5229,7 +5229,7 @@ simplify_set (x)
       if (GET_MODE_BITSIZE (inner_mode) <= HOST_BITS_PER_WIDE_INT
 	  && (nonzero_bits (inner, inner_mode)
 	      < ((unsigned HOST_WIDE_INT) 1
-		 << (GET_MODE_BITSIZE (inner_mode) - 1))))
+		 << (GET_MODE_BITSIZE (GET_MODE (src)) - 1))))
 	{
 	  SUBST (SET_SRC (x), inner);
 	  src = SET_SRC (x);