static void assign_reg(const ir_node *block, ir_node *node,
unsigned *forbidden_regs)
{
- const arch_register_t *reg;
+ const arch_register_t *final_reg;
allocation_info_t *info;
const arch_register_req_t *req;
reg_pref_t *reg_prefs;
ir_node *in_node;
- unsigned i;
+ unsigned r;
const unsigned *allowed_regs;
- unsigned r = 0;
+ unsigned final_reg_index = 0;
assert(!is_Phi(node));
/* preassigned register? */
- reg = arch_get_irn_register(node);
- if (reg != NULL) {
- DB((dbg, LEVEL_2, "Preassignment %+F -> %s\n", node, reg->name));
- use_reg(node, reg);
+ final_reg = arch_get_irn_register(node);
+ if (final_reg != NULL) {
+ DB((dbg, LEVEL_2, "Preassignment %+F -> %s\n", node, final_reg->name));
+ use_reg(node, final_reg);
return;
}
for (i = 0; i < arity; ++i) {
ir_node *in;
const arch_register_t *reg;
- unsigned r;
+ unsigned reg_index;
if (!rbitset_is_set(&req->other_same, i))
continue;
in = get_irn_n(in_node, i);
reg = arch_get_irn_register(in);
assert(reg != NULL);
- r = arch_register_get_index(reg);
+ reg_index = arch_register_get_index(reg);
/* if the value didn't die here then we should not propagate the
* should_be_same info */
- if (assignments[r] == in)
+ if (assignments[reg_index] == in)
continue;
- info->prefs[r] += weight * AFF_SHOULD_BE_SAME;
+ info->prefs[reg_index] += weight * AFF_SHOULD_BE_SAME;
}
}
DB((dbg, LEVEL_2, "Candidates for %+F:", node));
reg_prefs = ALLOCAN(reg_pref_t, n_regs);
fill_sort_candidates(reg_prefs, info);
- for (i = 0; i < n_regs; ++i) {
- unsigned num = reg_prefs[i].num;
+ for (r = 0; r < n_regs; ++r) {
+ unsigned num = reg_prefs[r].num;
const arch_register_t *reg;
if (!rbitset_is_set(normal_regs, num))
continue;
-
reg = arch_register_for_index(cls, num);
- DB((dbg, LEVEL_2, " %s(%f)", reg->name, reg_prefs[i].pref));
+ DB((dbg, LEVEL_2, " %s(%f)", reg->name, reg_prefs[r].pref));
}
DB((dbg, LEVEL_2, "\n"));
allowed_regs = req->limited;
}
- for (i = 0; i < n_regs; ++i) {
+ for (r = 0; r < n_regs; ++r) {
float pref, delta;
ir_node *before;
bool res;
- r = reg_prefs[i].num;
- if (!rbitset_is_set(allowed_regs, r))
+ final_reg_index = reg_prefs[r].num;
+ if (!rbitset_is_set(allowed_regs, final_reg_index))
continue;
- if (assignments[r] == NULL)
+ /* alignment constraint? */
+ if (req->width > 1 && (req->type & arch_register_req_type_aligned)
+ && (final_reg_index % req->width) != 0)
+ continue;
+
+ if (assignments[final_reg_index] == NULL)
break;
- pref = reg_prefs[i].pref;
- delta = i+1 < n_regs ? pref - reg_prefs[i+1].pref : 0;
+ pref = reg_prefs[r].pref;
+ delta = r+1 < n_regs ? pref - reg_prefs[r+1].pref : 0;
before = skip_Proj(node);
- res = try_optimistic_split(assignments[r], before,
+ res = try_optimistic_split(assignments[final_reg_index], before,
pref, delta, forbidden_regs, 0);
if (res)
break;
}
- if (i >= n_regs) {
+ if (r >= n_regs) {
/* the common reason to hit this panic is when 1 of your nodes is not
* register pressure faithful */
panic("No register left for %+F\n", node);
}
- reg = arch_register_for_index(cls, r);
- DB((dbg, LEVEL_2, "Assign %+F -> %s\n", node, reg->name));
- use_reg(node, reg);
+ final_reg = arch_register_for_index(cls, final_reg_index);
+ DB((dbg, LEVEL_2, "Assign %+F -> %s\n", node, final_reg->name));
+ use_reg(node, final_reg);
}
/**
const arch_register_t *reg;
const arch_register_req_t *req;
const unsigned *limited;
- unsigned r;
+ unsigned reg_index;
if (!arch_irn_consider_in_reg_alloc(cls, op))
continue;
if (!(req->type & arch_register_req_type_limited))
continue;
- limited = req->limited;
- reg = arch_get_irn_register(op);
- r = arch_register_get_index(reg);
- if (!rbitset_is_set(limited, r)) {
+ limited = req->limited;
+ reg = arch_get_irn_register(op);
+ reg_index = arch_register_get_index(reg);
+ if (!rbitset_is_set(limited, reg_index)) {
/* found an assignment outside the limited set */
good = false;
break;
static int find_value_in_block_info(block_info_t *info, ir_node *value)
{
unsigned r;
- ir_node **assignments = info->assignments;
+ ir_node **end_assignments = info->assignments;
for (r = 0; r < n_regs; ++r) {
- ir_node *a_value = assignments[r];
+ ir_node *a_value = end_assignments[r];
if (a_value == NULL)
continue;
DB((dbg, LEVEL_3, "Create Phi %+F (for %+F) -", phi, node));
#ifdef DEBUG_libfirm
{
- int i;
- for (i = 0; i < n_preds; ++i) {
- DB((dbg, LEVEL_3, " %+F", phi_ins[i]));
+ int pi;
+ for (pi = 0; pi < n_preds; ++pi) {
+ DB((dbg, LEVEL_3, " %+F", phi_ins[pi]));
}
DB((dbg, LEVEL_3, "\n"));
}
/* assign instructions in the block */
sched_foreach(block, node) {
- int i;
int arity;
ir_node *value;
static void determine_block_order(void)
{
- size_t i;
+ size_t p;
ir_node **blocklist = be_get_cfgpostorder(irg);
size_t n_blocks = ARR_LEN(blocklist);
int dfs_num = 0;
size_t order_p = 0;
/* clear block links... */
- for (i = 0; i < n_blocks; ++i) {
- ir_node *block = blocklist[i];
+ for (p = 0; p < n_blocks; ++p) {
+ ir_node *block = blocklist[p];
set_irn_link(block, NULL);
}
/* walk blocks in reverse postorder, the costs for each block are the
* sum of the costs of its predecessors (excluding the costs on backedges
* which we can't determine) */
- for (i = n_blocks; i > 0;) {
+ for (p = n_blocks; p > 0;) {
block_costs_t *cost_info;
- ir_node *block = blocklist[--i];
+ ir_node *block = blocklist[--p];
float execfreq = (float)get_block_execfreq(execfreqs, block);
float costs = execfreq;
int n_cfgpreds = get_Block_n_cfgpreds(block);
- int p;
- for (p = 0; p < n_cfgpreds; ++p) {
- ir_node *pred_block = get_Block_cfgpred_block(block, p);
+ int p2;
+ for (p2 = 0; p2 < n_cfgpreds; ++p2) {
+ ir_node *pred_block = get_Block_cfgpred_block(block, p2);
block_costs_t *pred_costs = (block_costs_t*)get_irn_link(pred_block);
/* we don't have any info for backedges */
if (pred_costs == NULL)
ir_reserve_resources(irg, IR_RESOURCE_BLOCK_VISITED);
inc_irg_block_visited(irg);
- for (i = 0; i < n_blocks; ++i) {
- ir_node *block = blocklist[i];
+ for (p = 0; p < n_blocks; ++p) {
+ ir_node *block = blocklist[p];
if (Block_block_visited(block))
continue;
projects / libfirm / blobdiff