* simplify-rtx.c (simplify_subreg): Avoid creating of incorrect subregs.

From-SVN: r42212

gcc/ChangeLog

+Thu May 17 19:40:03 CEST 2001  Jan Hubicka  <jh@suse.cz>
+
+	* simplify-rtx.c  (simplify_subreg): Avoid creating of incorrect subregs.
+
 2001-05-17  Bernd Schmidt  <bernds@redhat.com>
 
 	* expr.c (protect_from_queue): Protect against subsequent calls to

gcc/simplify-rtx.c

@@ -2331,6 +2331,10 @@ simplify_subreg (outermode, op, innermode, byte)
 			       % UNITS_PER_WORD));
 	}
 
+      /* Bail out in case resulting subreg would be incorrect.  */
+      if (final_offset % GET_MODE_SIZE (outermode)
+	  || final_offset >= GET_MODE_SIZE (innermostmode))
+	return NULL;
       /* Recurse for futher possible simplifications.  */
       new = simplify_subreg (outermode, SUBREG_REG (op),
 			     GET_MODE (SUBREG_REG (op)),