lambda-code.c (replace_uses_equiv_to_x_with_y): Check step and access function…

lambda-code.c (replace_uses_equiv_to_x_with_y): Check step and access function against chrec_dont_know.


2005-06-10  Daniel Berlin  <dberlin@dberlin.org>

	* lambda-code.c (replace_uses_equiv_to_x_with_y): Check step
	and access function against chrec_dont_know.

From-SVN: r100831

gcc/ChangeLog

 2005-06-10  Daniel Berlin  <dberlin@dberlin.org>
 
+	* lambda-code.c (replace_uses_equiv_to_x_with_y): Check step
+	and access function against chrec_dont_know.
+	  
+2005-06-10  Daniel Berlin  <dberlin@dberlin.org>
+
 	* lambda-code.c (replace_uses_of_x_with_y): Renamed and rewritten
-        slightly.
+	slightly.
 	(exit_phi_for_loop_p): New function.
 	(can_put_in_inner_loop): Ditto.
 	(can_convert_to_perfect_nest): Ditto.

gcc/lambda-code.c

@@ -2182,9 +2182,9 @@ replace_uses_equiv_to_x_with_y (struct loop *loop, tree stmt, tree x,
       
       access_fn = instantiate_parameters
 	(loop, analyze_scalar_evolution (loop, use));
-      if (access_fn != NULL_TREE)
+      if (access_fn != NULL_TREE && access_fn != chrec_dont_know)
 	step = evolution_part_in_loop_num (access_fn, loop->num);
-      if ((step && int_cst_value (step) == xstep)
+      if ((step && step != chrec_dont_know && int_cst_value (step) == xstep)
 	  || USE_FROM_PTR (use_p) == x)
 	SET_USE (use_p, y);
     }