Fix fast-math-pr55281.c ICE

2020-01-31  Andrew Stubbs  <ams@codesourcery.com>

	gcc/
	* tree-ssa-loop-ivopts.c (get_iv): Use sizetype for zero-step.
	(find_inv_vars_cb): Likewise.

gcc/ChangeLog

+2020-01-31  Andrew Stubbs  <ams@codesourcery.com>
+
+	* tree-ssa-loop-ivopts.c (get_iv): Use sizetype for zero-step.
+	(find_inv_vars_cb): Likewise.
+
 2020-01-31  David Malcolm  <dmalcolm@redhat.com>
 
 	* calls.c (special_function_p): Split out the check for DECL_NAME

gcc/tree-ssa-loop-ivopts.c

@@ -1246,7 +1246,11 @@ get_iv (struct ivopts_data *data, tree var)
 
       if (!bb
 	  || !flow_bb_inside_loop_p (data->current_loop, bb))
-	set_iv (data, var, var, build_int_cst (type, 0), true);
+	{
+	  if (POINTER_TYPE_P (type))
+	    type = sizetype;
+	  set_iv (data, var, var, build_int_cst (type, 0), true);
+	}
     }
 
   return name_info (data, var)->iv;
@@ -2990,7 +2994,10 @@ find_inv_vars_cb (tree *expr_p, int *ws ATTRIBUTE_UNUSED, void *data)
 
       if (!bb || !flow_bb_inside_loop_p (idata->current_loop, bb))
 	{
-	  set_iv (idata, op, op, build_int_cst (TREE_TYPE (op), 0), true);
+	  tree steptype = TREE_TYPE (op);
+	  if (POINTER_TYPE_P (steptype))
+	    steptype = sizetype;
+	  set_iv (idata, op, op, build_int_cst (steptype, 0), true);
 	  record_invariant (idata, op, false);
 	}
     }