* loop.c (load_mems) Don't use hard registers for the hoisting.

	* unroll.c (unroll_loop): Avoid overflow in the n_iterations
	calculation; rename const_equiv array in the preconditioning code
	from loop_unroll to loop_unroll_precondition

From-SVN: r33480

gcc/ChangeLog

+Thu Apr 27 14:54:22 MET DST 2000  Jan Hubicka  <jh@suse.cz>
+
+	* loop.c (load_mems)  Don't use hard registers for the hoisting.
+
+	* unroll.c (unroll_loop): Avoid overflow in the n_iterations
+	calculation; rename const_equiv array in the preconditioning code
+	from loop_unroll to loop_unroll_precondition
+
 2000-04-27  Richard Henderson  <rth@cygnus.com>
 
 	* flow.c (struct propagate_block_info): Remove new_dead, new_live;

gcc/loop.c

@@ -9887,7 +9887,13 @@ load_mems (loop)
 		{
 		  if (CONSTANT_P (equiv->loc))
 		    const_equiv = equiv;
-		  else if (GET_CODE (equiv->loc) == REG)
+		  else if (GET_CODE (equiv->loc) == REG
+			   /* Extending hard register lifetimes cuases crash
+			      on SRC targets.  Doing so on non-SRC is
+			      probably also not good idea, since we most
+			      probably have pseudoregister equivalence as
+			      well.  */
+			   && REGNO (equiv->loc) >= FIRST_PSEUDO_REGISTER)
 		    best_equiv = equiv;
 		}
 	      /* Use the constant equivalence if that is cheap enough.  */

gcc/unroll.c

@@ -385,6 +385,8 @@ unroll_loop (loop, insn_count, end_insert_before, strength_reduce_p)
       return;
     }
   else if (loop_info->n_iterations > 0
+	   /* Avoid overflow in the next expression.  */
+	   && loop_info->n_iterations < MAX_UNROLLED_INSNS
 	   && loop_info->n_iterations * insn_count < MAX_UNROLLED_INSNS)
     {
       unroll_number = loop_info->n_iterations;
@@ -906,7 +908,7 @@ unroll_loop (loop, insn_count, end_insert_before, strength_reduce_p)
 	  map->reg_map = (rtx *) xmalloc (maxregnum * sizeof (rtx));
 
 	  VARRAY_CONST_EQUIV_INIT (map->const_equiv_varray, maxregnum,
-				   "unroll_loop");
+				   "unroll_loop_precondition");
 	  global_const_equiv_varray = map->const_equiv_varray;
 
 	  init_reg_map (map, maxregnum);