* alias.c (find_base_value): Avoid reading past end of reg_base_value.

From-SVN: r20240

gcc/ChangeLog

+Fri Jun  5 09:03:22 1998  John Carr  <jfc@mit.edu>
+
+	* alias.c (find_base_value): Avoid reading past	end of reg_base_value.
+
 Fri Jun  5 03:05:34 1998  Richard Henderson  <rth@cygnus.com>
 
 	* alpha.md (insxh-1): New insxl pattern for combine.

gcc/alias.c

@@ -129,6 +129,7 @@ find_base_value (src)
 	 The test above is not sufficient because the scheduler may move
 	 a copy out of an arg reg past the NOTE_INSN_FUNCTION_BEGIN.  */
       if (REGNO (src) >= FIRST_PSEUDO_REGISTER
+	  && REGNO (src) < reg_base_value_size
 	  && reg_base_value[REGNO (src)])
 	return reg_base_value[REGNO (src)];