static void clear_defs(ir_node *node)
{
/* clear values defined */
- if (get_irn_mode(node) == mode_T) {
- const ir_edge_t *edge;
- foreach_out_edge(node, edge) {
- ir_node *proj = get_edge_src_irn(edge);
- clear_reg_value(proj);
- }
- } else {
- clear_reg_value(node);
- }
+ be_foreach_value(node, value,
+ clear_reg_value(value);
+ );
}
static void set_uses(ir_node *node)
*/
static void process_block(ir_node *block, void *data)
{
- int l;
(void) data;
/* construct initial register assignment */
memset(register_values, 0, sizeof(ir_node*) * arch_env->n_registers);
- assert(lv->nodes && "live sets must be computed");
+ assert(lv->sets_valid && "live sets must be computed");
DB((dbg, LEVEL_1, "\nProcessing block %+F (from end)\n", block));
- be_lv_foreach(lv, block, be_lv_state_end, l) {
- ir_node *node = be_lv_get_irn(lv, block, l);
+ be_lv_foreach(lv, block, be_lv_state_end, node) {
set_reg_value(node);
}
DB((dbg, LEVEL_1, "\nstart processing\n"));
*/
bool be_has_only_one_user(ir_node *node)
{
- int n = get_irn_n_edges(node);
- int n_users;
- const ir_edge_t *edge;
+ int n = get_irn_n_edges(node);
+ int n_users;
if (n <= 1)
return 1;
return n_users == 1;
}
-bool be_can_move_before(ir_heights_t *heights, const ir_node *node,
- const ir_node *before)
+static inline bool overlapping_regs(const arch_register_t *reg0,
+ const arch_register_req_t *req0, const arch_register_t *reg1,
+ const arch_register_req_t *req1)
+{
+ if (reg0 == NULL || reg1 == NULL)
+ return false;
+ return reg0->global_index < (unsigned)reg1->global_index + req1->width
+ && reg1->global_index < (unsigned)reg0->global_index + req0->width;
+}
+
+bool be_can_move_down(ir_heights_t *heights, const ir_node *node,
+ const ir_node *before)
{
+ assert(get_nodes_block(node) == get_nodes_block(before));
+ assert(sched_get_time_step(node) < sched_get_time_step(before));
+
int node_arity = get_irn_arity(node);
ir_node *schedpoint = sched_next(node);
while (schedpoint != before) {
- int i;
- unsigned n_outs = arch_get_irn_n_outs(schedpoint);
-
- /* the node must not use our computed values */
+ /* schedpoint must not use our computed values */
if (heights_reachable_in_block(heights, schedpoint, node))
return false;
- /* the node must not overwrite registers of our inputs */
- for (i = 0; i < node_arity; ++i) {
+ /* schedpoint must not overwrite registers of our inputs */
+ for (int i = 0; i < node_arity; ++i) {
ir_node *in = get_irn_n(node, i);
const arch_register_t *reg = arch_get_irn_register(in);
- const arch_register_req_t *in_req
- = arch_get_irn_register_req_in(node, i);
- unsigned o;
if (reg == NULL)
continue;
- for (o = 0; o < n_outs; ++o) {
+ const arch_register_req_t *in_req
+ = arch_get_irn_register_req_in(node, i);
+ be_foreach_out(schedpoint, o) {
const arch_register_t *outreg
= arch_get_irn_register_out(schedpoint, o);
const arch_register_req_t *outreq
= arch_get_irn_register_req_out(schedpoint, o);
- if (outreg == NULL)
- continue;
- if (outreg->global_index >= reg->global_index
- && outreg->global_index
- < (unsigned)reg->global_index + in_req->width)
- return false;
- if (reg->global_index >= outreg->global_index
- && reg->global_index
- < (unsigned)outreg->global_index + outreq->width)
+ if (overlapping_regs(reg, in_req, outreg, outreq))
return false;
}
}
return true;
}
+bool be_can_move_up(ir_heights_t *heights, const ir_node *node,
+ const ir_node *after)
+{
+ const ir_node *node_block = get_nodes_block(node);
+ const ir_node *after_block = get_block_const(after);
+ const ir_node *schedpoint;
+ if (node_block != after_block) {
+ /* currently we can move up exactly 1 block */
+ assert(get_Block_cfgpred_block(node_block, 0) == after_block);
+ ir_node *first = sched_first(node_block);
+
+ /* do not move nodes changing memory */
+ if (is_memop(node)) {
+ ir_node *meminput = get_memop_mem(node);
+ if (!is_NoMem(meminput))
+ return false;
+ }
+
+ /* make sure we can move to the beginning of the succ block */
+ if (node != first && !be_can_move_up(heights, node, sched_prev(first)))
+ return false;
+
+ /* check if node overrides any of live-in values of other successors */
+ ir_graph *irg = get_irn_irg(node);
+ be_lv_t *lv = be_get_irg_liveness(irg);
+ foreach_block_succ(after_block, edge) {
+ ir_node *succ = get_edge_src_irn(edge);
+ if (succ == node_block)
+ continue;
+
+ be_lv_foreach(lv, succ, be_lv_state_in, live_node) {
+ const arch_register_t *reg = arch_get_irn_register(live_node);
+ const arch_register_req_t *req = arch_get_irn_register_req(live_node);
+ be_foreach_out(node, o) {
+ const arch_register_t *outreg
+ = arch_get_irn_register_out(node, o);
+ const arch_register_req_t *outreq
+ = arch_get_irn_register_req_out(node, o);
+ if (overlapping_regs(outreg, outreq, reg, req))
+ return false;
+ }
+ }
+ sched_foreach(succ, phi) {
+ if (!is_Phi(phi))
+ break;
+ const arch_register_t *reg = arch_get_irn_register(phi);
+ const arch_register_req_t *req = arch_get_irn_register_req(phi);
+ be_foreach_out(node, o) {
+ const arch_register_t *outreg
+ = arch_get_irn_register_out(node, o);
+ const arch_register_req_t *outreq
+ = arch_get_irn_register_req_out(node, o);
+ if (overlapping_regs(outreg, outreq, reg, req))
+ return false;
+ }
+ }
+ }
+ schedpoint = sched_last(after_block);
+ } else {
+ schedpoint = sched_prev(node);
+ }
+
+ /* move schedule upwards until we hit the "after" node */
+ while (schedpoint != after) {
+ /* TODO: the following heights query only works for nodes in the same
+ * block, otherwise we have to be conservative here */
+ if (get_nodes_block(node) != get_nodes_block(schedpoint))
+ return false;
+ /* node must not depend on schedpoint */
+ if (heights_reachable_in_block(heights, node, schedpoint))
+ return false;
+
+ /* node must not overwrite registers used by schedpoint */
+ int arity = get_irn_arity(schedpoint);
+ for (int i = 0; i < arity; ++i) {
+ const arch_register_t *reg
+ = arch_get_irn_register_in(schedpoint, i);
+ if (reg == NULL)
+ continue;
+ const arch_register_req_t *in_req
+ = arch_get_irn_register_req_in(schedpoint, i);
+ be_foreach_out(node, o) {
+ const arch_register_t *outreg
+ = arch_get_irn_register_out(node, o);
+ const arch_register_req_t *outreq
+ = arch_get_irn_register_req_out(node, o);
+ if (overlapping_regs(outreg, outreq, reg, in_req))
+ return false;
+ }
+ }
+
+ schedpoint = sched_prev(schedpoint);
+ }
+ return true;
+}
+
/*
* Tries to optimize a beIncSP node with its previous IncSP node.
* Must be run from a be_peephole_opt() context.
projects / libfirm / blobdiff