#include <assert.h>
#include "tailrec.h"
#include "array.h"
-#include "irprog.h"
+#include "irprog_t.h"
#include "irgwalk.h"
#include "irgmod.h"
#include "irop.h"
* the lifetime of locals end with the recursive call.
* We do this by checking that no address of a local variable is
* stored or transmitted as an argument to a call.
+ *
+ * @return non-zero if it's ok to do tail recursion
*/
static int check_lifetime_of_locals(ir_graph *irg)
{
int opt_tail_rec_irg(ir_graph *irg)
{
ir_node *end_block;
- int n_preds;
int i, n_tail_calls = 0;
ir_node *rets = NULL;
type *mtd_type, *call_type;
end_block = get_irg_end_block(irg);
set_irn_link(end_block, NULL);
- n_preds = get_Block_n_cfgpreds(end_block);
- for (i = 0; i < n_preds; ++i) {
+ for (i = get_Block_n_cfgpreds(end_block) - 1; i >= 0; --i) {
ir_node *ret = get_Block_cfgpred(end_block, i);
ir_node *call, *call_ptr;
entity *ent;
- int j, n_ress;
+ int j;
ir_node **ress;
/* search all returns of a block */
continue;
/* ok, mem is routed to a recursive call, check return args */
- n_ress = get_Return_n_ress(ret);
ress = get_Return_res_arr(ret);
-
- for (j = 0; j < n_ress; ++j) {
+ for (j = get_Return_n_ress(ret) - 1; j >= 0; --j) {
ir_node *irn = skip_Proj(skip_Proj(ress[j]));
if (irn != call) {
- /* not routed to a call */
- break;
+ /* not routed to a call */
+ break;
}
}
- if (j < n_ress)
+ if (j >= 0)
continue;
/*
if (mtd_type != call_type) {
/*
* Hmm, the types did not match, bad.
- * This can happen in C when no prototyp is given
+ * This can happen in C when no prototype is given
* or K&R style is used.
*/
#if 0
{
int i;
int n_opt_applications = 0;
+ ir_graph *irg;
if (! get_opt_tail_recursion() || ! get_opt_optimize())
return;
- for (i = 0; i < get_irp_n_irgs(); i++) {
- current_ir_graph = get_irp_irg(i);
+ for (i = get_irp_n_irgs() - 1; i >= 0; --i) {
+ irg = get_irp_irg(i);
- if (opt_tail_rec_irg(current_ir_graph))
+ if (opt_tail_rec_irg(irg))
++n_opt_applications;
}