re PR middle-end/23831 (ICE in immed_double_const with vectorized multipication)

	PR middle-end/23831
	* simplify-rtx.c (simplify_immed_subreg) [MODE_INT]: Skip
	simplification if elem_bitsize > 2 * HOST_BITS_PER_WIDE_INT.

From-SVN: r104650

gcc/ChangeLog

+2005-09-26  Uros Bizjak  <uros@kss-loka.si>
+
+	PR middle-end/23831
+	* simplify-rtx.c (simplify_immed_subreg) [MODE_INT]: Skip
+	simplification if elem_bitsize > 2 * HOST_BITS_PER_WIDE_INT.
+
 2005-09-26    Fariborz Jahanian <fjahanian@apple.com>
 
         * combine.c (make_extraction): Check for valid use of subreg.

gcc/simplify-rtx.c

@@ -3743,8 +3743,10 @@ simplify_immed_subreg (enum machine_mode outermode, rtx op,
 	       know why.  */
 	    if (elem_bitsize <= HOST_BITS_PER_WIDE_INT)
 	      elems[elem] = gen_int_mode (lo, outer_submode);
-	    else
+	    else if (elem_bitsize <= 2 * HOST_BITS_PER_WIDE_INT)
 	      elems[elem] = immed_double_const (lo, hi, outer_submode);
+	    else
+	      return NULL_RTX;
 	  }
 	  break;