loop.c

From-SVN: r31500

gcc/ChangeLog

+2000-01-20  Michael Hayes  <m.hayes@elec.canterbury.ac.nz>
+
+	* loop.c (current_loop_info): Renamed from loop_info_data
+	and changed to a pointer.
+	(loop_optimize): Allocate loop_info structure for each loop
+	and initialise to zero.
+	(scan_loop): Set current_loop_info.
+
+	* unroll.c (loop_iterations): Don't abort if REG_USERVAR_P set
+	on iteration_var.
+
 2000-01-19  Richard Henderson  <rth@cygnus.com>
 
 	* stupid.c: Die die die.

gcc/unroll.c

@@ -3702,10 +3702,14 @@ loop_iterations (loop)
       return 0;
     }
 
-  /* The only new registers that care created before loop iterations are
-     givs made from biv increments, so this should never occur.  */
-
-  if ((unsigned) REGNO (iteration_var) >= reg_iv_type->num_elements)
+  /* The only new registers that are created before loop iterations
+     are givs made from biv increments or registers created by
+     load_mems.  In the latter case, it is possible that try_copy_prop
+     will propagate a new pseudo into the old iteration register but
+     this will be marked by having the REG_USERVAR_P bit set.  */
+
+  if ((unsigned) REGNO (iteration_var) >= reg_iv_type->num_elements
+      && ! REG_USERVAR_P (iteration_var))
     abort ();
 
   iteration_info (iteration_var, &initial_value, &increment,