#define REMAT_WHILE_LIVE /* only remat values that are live */
//#define NO_ENLARGE_L1V3N355 /* do not remat after the death of some operand */
//#define EXECFREQ_LOOPDEPH /* compute execution frequency from loop depth only */
-//#define MAY_DIE_AT_PRE_REMAT /* allow values to die after a pre remat */
-#define CHECK_POST_REMAT /* check pressure after post remats (conservative but otherwise we can temporarily exceed the register pressure) */
+#define MAY_DIE_AT_REMAT /* allow values to die after a pre remat */
#define NO_SINGLE_USE_REMATS /* do not repair schedule */
//#define KEEPALIVE_SPILLS
//#define KEEPALIVE_RELOADS
#define GOODWIN_REDUCTION
-//#define NO_MEMCOPIES
+#define NO_MEMCOPIES
#define SOLVE
//#define SOLVE_LOCAL
static INLINE int
is_rematerializable(const spill_ilp_t * si, const ir_node * irn)
{
- int i,
- n;
+ int n;
const arch_env_t *arch_env = si->chordal_env->birg->main_env->arch_env;
int remat = (arch_irn_get_flags(arch_env, irn) & arch_irn_flags_rematerializable) != 0;
ir_fprintf(stderr, " Node %+F is not rematerializable\n", irn);
#endif
- for (i = 0, n = get_irn_arity(irn); i < n && remat; ++i) {
- ir_node *op = get_irn_n(irn, i);
+ for (n = get_irn_arity(irn)-1; n>=0 && remat; --n) {
+ ir_node *op = get_irn_n(irn, n);
remat &= has_reg_class(si, op) || arch_irn_get_flags(arch_env, op) & arch_irn_flags_ignore || (get_irn_op(op) == op_NoMem);
// if(!remat)
remat->inverse = 0;
} else {
arch_inverse_t inverse;
- int i,
- n;
+ int n;
/* get the index of the operand we want to retrieve by the inverse op */
- for (i = 0, n = get_irn_arity(op); i < n; ++i) {
- ir_node *arg = get_irn_n(op, i);
+ for (n = get_irn_arity(op)-1; n>=0; --n) {
+ ir_node *arg = get_irn_n(op, n);
if(arg == dest_value) break;
}
- if(i == n) return NULL;
+ if(n<0) return NULL;
- DBG((si->dbg, LEVEL_5, "\t requesting inverse op for argument %d of op %+F\n", i, op));
+ DBG((si->dbg, LEVEL_5, "\t requesting inverse op for argument %d of op %+F\n", n, op));
/* else ask the backend to give an inverse op */
- if(arch_get_inverse(si->chordal_env->birg->main_env->arch_env, op, i, &inverse, si->obst)) {
+ if(arch_get_inverse(si->chordal_env->birg->main_env->arch_env, op, n, &inverse, si->obst)) {
int i;
DBG((si->dbg, LEVEL_4, "\t backend gave us an inverse op with %d nodes and cost %d\n", inverse.n, inverse.costs));
assert(inverse.n > 0 && "inverse op should have at least one node");
- for(i=0; i<inverse.n; ++i) {
+ for(i=inverse.n-1; i>=0; --i) {
pset_insert_ptr(si->inverse_ops, inverse.nodes[i]);
}
{
remat_info_t *remat_info,
query;
- int i,
- n;
+ int n;
assert(remat->op);
assert(remat->value);
pset_insert(remat_info->remats, remat, HASH_PTR(remat->op));
/* insert the remat into the remats_be_operand set of each argument of the remat op */
- for (i = 0, n = get_irn_arity(remat->op); i < n; ++i) {
- ir_node *arg = get_irn_n(remat->op, i);
+ for (n = get_irn_arity(remat->op)-1; n>=0; --n) {
+ ir_node *arg = get_irn_n(remat->op, n);
query.irn = arg;
query.remats = NULL;
static INLINE void
get_remats_from_op(spill_ilp_t * si, const ir_node * op)
{
- int i,
- n;
+ int n;
remat_t *remat;
#ifdef NO_SINGLE_USE_REMATS
#ifdef COLLECT_INVERSE_REMATS
/* repeat the whole stuff for each remat retrieved by get_remat_from_op(op, arg)
for each arg */
- for (i = 0, n = get_irn_arity(op); i < n; ++i) {
- ir_node *arg = get_irn_n(op, i);
+ for (n = get_irn_arity(op)-1; n>=0; --n) {
+ ir_node *arg = get_irn_n(op, n);
if(has_reg_class(si, arg)) {
/* try to get an inverse remat */
{
const ir_node *op = remat->op;
const ir_node *prev;
- int i,
- n,
+ int n,
res = 1;
if(is_Block(pos)) {
}
#endif
- for(i=0, n=get_irn_arity(op); i<n && res; ++i) {
- const ir_node *arg = get_irn_n(op, i);
+ for(n=get_irn_arity(op)-1; n>=0 && res; --n) {
+ const ir_node *arg = get_irn_n(op, n);
#ifdef NO_ENLARGE_L1V3N355
if(has_reg_class(si, arg) && live) {
return copy;
}
-static void
+static ir_node *
insert_remat_after(spill_ilp_t * si, const remat_t * remat, const ir_node * pos, const pset * live)
{
char buf[256];
} else {
proj_copy = NULL;
}
+
+ return copy;
}
+
+ return NULL;
}
-static void
+static ir_node *
insert_remat_before(spill_ilp_t * si, const remat_t * remat, const ir_node * pos, const pset * live)
{
char buf[256];
} else {
proj_copy = NULL;
}
+
+ return copy;
}
+
+ return NULL;
}
static int
#endif
}
+static void
+walker_regclass_copy_insertor(ir_node * irn, void * data)
+{
+ spill_ilp_t *si = data;
+
+ if(is_Phi(irn) && has_reg_class(si, irn)) {
+ int n;
+
+ for(n=get_irn_arity(irn)-1; n>=0; --n) {
+ ir_node *phi_arg = get_irn_n(irn, n);
+ ir_node *bb = get_Block_cfgpred_block(get_nodes_block(irn), n);
+
+ if(!has_reg_class(si, phi_arg)) {
+ ir_node *copy = be_new_Copy(si->cls, si->chordal_env->irg, bb, phi_arg);
+ ir_node *pos = sched_block_last_noncf(si, bb);
+ op_t *op = obstack_alloc(si->obst, sizeof(*op));
+
+ DBG((si->dbg, LEVEL_2, "\t copy to my regclass for arg %+F of %+F\n", phi_arg, irn));
+ sched_add_after(pos, copy);
+ set_irn_n(irn, n, copy);
+
+ op->is_remat = 0;
+ op->attr.live_range.args.reloads = NULL;
+ op->attr.live_range.ilp = ILP_UNDEF;
+ set_irn_link(copy, op);
+ }
+ }
+ }
+}
+
+
/**
* Insert (so far unused) remats into the irg to
* recompute the potential liveness of all values
op_t *op;
pset *args;
ir_node *arg;
+ pset *remat_args;
next = sched_prev(irn);
pset_insert_ptr(args, arg);
}
- /* set args of op live in epilog */
+ /* set args of op already live in epilog */
pset_foreach(args, arg) {
if(has_reg_class(si, arg)) {
pset_insert_ptr(live, arg);
}
}
- /* insert all possible remats after irn */
+ remat_args = pset_new_ptr_default();
+
+ /* insert all possible remats before irn */
pset_foreach(args, arg) {
remat_info_t *remat_info,
query;
continue;
}
- /* do not place post remats after jumps */
- if(sched_skip_cf_predicator(irn, si->chordal_env->birg->main_env->arch_env)) continue;
+ if(remat_info->remats) {
+ pset_foreach(remat_info->remats, remat) {
+ ir_node *remat_irn = NULL;
- if(remat_info->remats_by_operand) {
- pset_foreach(remat_info->remats_by_operand, remat) {
- /* do not insert remats producing the same value as one of the operands */
- if(!pset_find_ptr(args, remat->value)) {
- DBG((si->dbg, LEVEL_4, "\t considering remat %+F with arg %+F\n", remat->op, arg));
+ DBG((si->dbg, LEVEL_4, "\t considering remat %+F for arg %+F\n", remat->op, arg));
#ifdef REMAT_WHILE_LIVE
- if(pset_find_ptr(live, remat->value)) {
- insert_remat_after(si, remat, irn, live);
- }
+ if(pset_find_ptr(live, remat->value)) {
+ remat_irn = insert_remat_before(si, remat, irn, live);
+ }
#else
- insert_remat_after(si, remat, irn, live);
+ remat_irn = insert_remat_before(si, remat, irn, live);
#endif
+ if(remat_irn) {
+ for(n=get_irn_arity(remat_irn)-1; n>=0; --n) {
+ ir_node *remat_arg = get_irn_n(remat_irn, n);
+
+ if(!has_reg_class(si, remat_arg)) continue;
+
+ pset_insert_ptr(remat_args, remat_arg);
+ }
}
}
}
}
- /* delete defined value from live set */
- if(has_reg_class(si, irn)) {
- pset_remove_ptr(live, irn);
+ /* now we add remat args to op's args because they could also die at this op */
+ pset_foreach(args,arg) {
+ if(pset_find_ptr(remat_args, arg)) {
+ pset_remove_ptr(remat_args, arg);
+ }
+ }
+ pset_foreach(remat_args,arg) {
+ pset_insert_ptr(args, arg);
}
- /* insert all possible remats before irn */
+ /* insert all possible remats after irn */
pset_foreach(args, arg) {
remat_info_t *remat_info,
query;
remat_t *remat;
- /* continue if the operand has the wrong reg class
- */
+ /* continue if the operand has the wrong reg class */
if(!has_reg_class(si, arg))
continue;
continue;
}
- if(remat_info->remats) {
- pset_foreach(remat_info->remats, remat) {
- DBG((si->dbg, LEVEL_4, "\t considering remat %+F for arg %+F\n", remat->op, arg));
+ /* do not place post remats after jumps */
+ if(sched_skip_cf_predicator(irn, si->chordal_env->birg->main_env->arch_env)) continue;
+
+ if(remat_info->remats_by_operand) {
+ pset_foreach(remat_info->remats_by_operand, remat) {
+ /* do not insert remats producing the same value as one of the operands */
+ if(!pset_find_ptr(args, remat->value)) {
+ DBG((si->dbg, LEVEL_4, "\t considering remat %+F with arg %+F\n", remat->op, arg));
#ifdef REMAT_WHILE_LIVE
- if(pset_find_ptr(live, remat->value)) {
- insert_remat_before(si, remat, irn, live);
- }
+ if(pset_find_ptr(live, remat->value)) {
+ insert_remat_after(si, remat, irn, live);
+ }
#else
- insert_remat_before(si, remat, irn, live);
+ insert_remat_after(si, remat, irn, live);
#endif
+ }
}
}
}
+ /* delete defined value from live set */
+ if(has_reg_class(si, irn)) {
+ pset_remove_ptr(live, irn);
+ }
+
+ del_pset(remat_args);
del_pset(args);
irn = next;
}
/* collect values used by cond jumps etc. at bb end (use_end) -> always live */
/* their reg_out must always be set */
sched_foreach_reverse(bb, irn) {
- int i,
- n;
+ int n;
if(!sched_skip_cf_predicator(irn, si->chordal_env->birg->main_env->arch_env)) break;
- for (i = 0, n = get_irn_arity(irn); i < n; ++i) {
- ir_node *irn_arg = get_irn_n(irn, i);
+ for (n=get_irn_arity(irn)-1; n>=0; --n) {
+ ir_node *irn_arg = get_irn_n(irn, n);
+
if(has_reg_class(si, irn_arg)) {
pset_insert_ptr(use_end, irn_arg);
}
}
ir_snprintf(buf, sizeof(buf), "check_end_%N", bb);
+ //cst = lpp_add_cst(si->lpp, buf, lpp_less, si->n_regs);
cst = lpp_add_cst(si->lpp, buf, lpp_less, si->n_regs - pset_count(use_end));
- spill_bb->ilp = new_set(cmp_spill, 16);
+ spill_bb->ilp = new_set(cmp_spill, pset_count(live)+pset_count(use_end));
+
+ /* if this is a merge edge we can reload at the end of this block */
+ if(is_merge_edge(bb)) {
+ spill_bb->reloads = new_set(cmp_keyval, pset_count(live)+pset_count(use_end));
+ } else if(pset_count(use_end)){
+ spill_bb->reloads = new_set(cmp_keyval, pset_count(use_end));
+ } else {
+ spill_bb->reloads = NULL;
+ }
pset_foreach(live,irn) {
spill_t query,
ir_snprintf(buf, sizeof(buf), "spill_%N_%N", irn, bb);
spill->spill = lpp_add_var(si->lpp, buf, lpp_binary, spill_cost);
+ if(is_merge_edge(bb)) {
+ ilp_var_t reload;
+ ilp_cst_t rel_cst;
+
+ ir_snprintf(buf, sizeof(buf), "reload_%N_%N", bb, irn);
+ reload = lpp_add_var(si->lpp, buf, lpp_binary, COST_LOAD*execution_frequency(si, bb));
+ set_insert_keyval(spill_bb->reloads, irn, INT_TO_PTR(reload));
+
+ /* reload <= mem_out */
+ rel_cst = lpp_add_cst(si->lpp, buf, lpp_less, 0.0);
+ lpp_set_factor_fast(si->lpp, rel_cst, reload, 1.0);
+ lpp_set_factor_fast(si->lpp, rel_cst, spill->mem_out, -1.0);
+ }
+
spill->reg_in = ILP_UNDEF;
spill->mem_in = ILP_UNDEF;
}
spill_t query,
*spill;
double spill_cost;
- ilp_cst_t end_use_req;
+ ilp_cst_t end_use_req,
+ rel_cst;
+ ilp_var_t reload;
query.irn = irn;
spill = set_insert(spill_bb->ilp, &query, sizeof(query), HASH_PTR(irn));
ir_snprintf(buf, sizeof(buf), "spill_%N_%N", irn, bb);
spill->spill = lpp_add_var(si->lpp, buf, lpp_binary, spill_cost);
+ ir_snprintf(buf, sizeof(buf), "reload_%N_%N", bb, irn);
+ reload = lpp_add_var(si->lpp, buf, lpp_binary, COST_LOAD*execution_frequency(si, bb));
+ set_insert_keyval(spill_bb->reloads, irn, INT_TO_PTR(reload));
+
+ /* reload <= mem_out */
+ rel_cst = lpp_add_cst(si->lpp, buf, lpp_less, 0.0);
+ lpp_set_factor_fast(si->lpp, rel_cst, reload, 1.0);
+ lpp_set_factor_fast(si->lpp, rel_cst, spill->mem_out, -1.0);
+
spill->reg_in = ILP_UNDEF;
spill->mem_in = ILP_UNDEF;
return NULL;
}
-/**
- * Find a remat of value @p value in the prolog of @p pos
- */
-static ir_node *
-find_pre_remat(const spill_ilp_t * si, const ir_node * value, const ir_node * pos)
-{
- while((pos = next_pre_remat(si,pos)) != NULL) {
- op_t *op;
-
- op = get_irn_link(pos);
- assert(op->is_remat && op->attr.remat.pre);
-
- if(op->attr.remat.remat->value == value)
- return (ir_node*)pos;
- }
-
- return NULL;
-}
-
static spill_t *
add_to_spill_bb(spill_ilp_t * si, ir_node * bb, ir_node * irn)
{
irn = sched_last(bb);
/* all values eaten by control flow operations are also live until the end of the block */
- while(sched_skip_cf_predicator(irn, si->chordal_env->birg->main_env->arch_env)) {
+ sched_foreach_reverse(bb, irn) {
int i;
+
+ if(!sched_skip_cf_predicator(irn, si->chordal_env->birg->main_env->arch_env)) break;
+
for(i=get_irn_arity(irn)-1; i>=0; --i) {
ir_node *arg = get_irn_n(irn,i);
pset_insert_ptr(live, arg);
}
}
-
- irn = sched_prev(irn);
}
}
char buf[256];
ilp_cst_t cst;
spill_bb_t *spill_bb = get_irn_link(bb);
- int i;
ir_node *tmp;
spill_t *spill;
- irn_live_t *li;
+ pset *defs = pset_new_ptr_default();
live = pset_new_ptr_default();
- /* do something at the end of the block */
+ /****************************************
+ * B A S I C B L O C K E N D
+ ***************************************/
+
/* init live values at end of block */
get_live_end(si, bb, live);
- if(is_merge_edge(bb)) {
- spill_bb->reloads = new_set(cmp_keyval, pset_count(live));
- } else {
- spill_bb->reloads = NULL;
- }
-
pset_foreach(live, irn) {
op_t *op;
- ilp_var_t reload;
+ ilp_var_t reload = ILP_UNDEF;
spill = set_find_spill(spill_bb->ilp, irn);
assert(spill);
if(spill_bb->reloads) {
- ir_snprintf(buf, sizeof(buf), "reload_%N_%N", bb, irn);
- reload = lpp_add_var(si->lpp, buf, lpp_binary, COST_LOAD*execution_frequency(si, bb));
-
- set_insert_keyval(spill_bb->reloads, irn, INT_TO_PTR(reload));
+ keyval_t *keyval = set_find_keyval(spill_bb->reloads, irn);
- /* reload <= mem_out */
- cst = lpp_add_cst(si->lpp, buf, lpp_less, 0.0);
- lpp_set_factor_fast(si->lpp, cst, reload, 1.0);
- lpp_set_factor_fast(si->lpp, cst, spill->mem_out, -1.0);
+ if(keyval) {
+ reload = PTR_TO_INT(keyval->val);
+ }
}
op = get_irn_link(irn);
/* reg_out - reload - remat - live_range <= 0 */
lpp_set_factor_fast(si->lpp, cst, spill->reg_out, 1.0);
- if(spill_bb->reloads) lpp_set_factor_fast(si->lpp, cst, reload, -1.0);
+ if(reload != ILP_UNDEF) lpp_set_factor_fast(si->lpp, cst, reload, -1.0);
lpp_set_factor_fast(si->lpp, cst, op->attr.live_range.ilp, -1.0);
foreach_pre_remat(si, bb, tmp) {
op_t *remat_op = get_irn_link(tmp);
lpp_set_factor_fast(si->lpp, cst, remat_op->attr.remat.ilp, -1.0);
}
}
+ /* maybe we should also assure that reg_out >= live_range etc. */
+ }
+
+ /*
+ * start new live ranges for values used by remats at end of block
+ * and assure the remat args are available
+ */
+ foreach_pre_remat(si, bb, tmp) {
+ op_t *remat_op = get_irn_link(tmp);
+ int n;
+
+ for (n=get_irn_arity(tmp)-1; n>=0; --n) {
+ ir_node *remat_arg = get_irn_n(tmp, n);
+ op_t *arg_op = get_irn_link(remat_arg);
+ ilp_var_t prev_lr;
+
+ if(!has_reg_class(si, remat_arg)) continue;
+
+ /* if value is becoming live through use by remat */
+ if(!pset_find_ptr(live, remat_arg)) {
+ ir_snprintf(buf, sizeof(buf), "lr_%N_end%N", remat_arg, bb);
+ prev_lr = lpp_add_var(si->lpp, buf, lpp_binary, 0.0);
+
+ arg_op->attr.live_range.ilp = prev_lr;
+ arg_op->attr.live_range.op = bb;
+
+ DBG((si->dbg, LEVEL_4, " value %+F becoming live through use by remat at end of block %+F\n", remat_arg, tmp));
+
+ pset_insert_ptr(live, remat_arg);
+ add_to_spill_bb(si, bb, remat_arg);
+ }
+
+ /* remat <= live_rang(remat_arg) [ + reload(remat_arg) ] */
+ ir_snprintf(buf, sizeof(buf), "req_remat_%N_arg_%N", tmp, remat_arg);
+ cst = lpp_add_cst(si->lpp, buf, lpp_less, 0.0);
+
+ lpp_set_factor_fast(si->lpp, cst, remat_op->attr.remat.ilp, 1.0);
+ lpp_set_factor_fast(si->lpp, cst, arg_op->attr.live_range.ilp, -1.0);
+
+ /* use reload placed for this argument */
+ if(spill_bb->reloads) {
+ keyval_t *keyval = set_find_keyval(spill_bb->reloads, remat_arg);
+
+ if(keyval) {
+ ilp_var_t reload = PTR_TO_INT(keyval->val);
+
+ lpp_set_factor_fast(si->lpp, cst, reload, -1.0);
+ }
+ }
+ }
}
DBG((si->dbg, LEVEL_4, "\t %d values live at end of block %+F\n", pset_count(live), bb));
- sched_foreach_reverse(bb, irn) {
+
+
+
+ /**************************************
+ * B A S I C B L O C K B O D Y
+ **************************************/
+
+ sched_foreach_reverse_from(sched_block_last_noncf(si, bb), irn) {
op_t *op;
op_t *tmp_op;
int n,
- k,
+ u = 0,
d = 0;
ilp_cst_t check_pre,
check_post;
-#ifdef CHECK_POST_REMAT
- ilp_cst_t check_post_remat;
-#endif
- set *args = new_set(cmp_keyval, get_irn_arity(irn));
+ set *args;
+ pset *used;
+ pset *remat_defs;
keyval_t *keyval;
+ /* iterate only until first phi */
if(is_Phi(irn))
break;
if(op->is_remat) continue;
DBG((si->dbg, LEVEL_4, "\t at node %+F\n", irn));
+ /* collect defined values */
if(has_reg_class(si, irn)) {
- assert(pset_find_ptr(live, irn));
- pset_remove_ptr(live, irn);
+ pset_insert_ptr(defs, irn);
}
+ /* skip projs */
if(is_Proj(irn)) continue;
- /* init set of irn's arguments */
+ /*
+ * init set of irn's arguments
+ * and all possibly used values around this op
+ * and values defined by post remats
+ */
+ args = new_set(cmp_keyval, get_irn_arity(irn));
+ used = pset_new_ptr(pset_count(live) + get_irn_arity(irn));
+ remat_defs = pset_new_ptr(pset_count(live));
+
for (n=get_irn_arity(irn)-1; n>=0; --n) {
ir_node *irn_arg = get_irn_n(irn, n);
if(has_reg_class(si, irn_arg)) {
set_insert_keyval(args, irn_arg, (void*)n);
+ pset_insert_ptr(used, irn_arg);
}
}
+ foreach_post_remat(irn, tmp) {
+ op_t *remat_op = get_irn_link(tmp);
-#ifdef CHECK_POST_REMAT
- /* check the register pressure after the epilog */
- ir_snprintf(buf, sizeof(buf), "check_post_remat_%N", irn);
- check_post_remat = lpp_add_cst(si->lpp, buf, lpp_less, si->n_regs);
+ pset_insert_ptr(remat_defs, remat_op->attr.remat.remat->value);
- /* iterate over L\U */
- pset_foreach(live, tmp) {
- if(!set_find_keyval(args, tmp)) {
- /* if a live value is not used by irn */
- tmp_op = get_irn_link(tmp);
-// assert(tmp_op->attr.live_range.op != irn);
- lpp_set_factor_fast(si->lpp, check_post_remat, tmp_op->attr.live_range.ilp, 1.0);
+ for (n=get_irn_arity(tmp)-1; n>=0; --n) {
+ ir_node *remat_arg = get_irn_n(tmp, n);
+ if(has_reg_class(si, remat_arg)) {
+ pset_insert_ptr(used, remat_arg);
+ }
+ }
+ }
+ foreach_pre_remat(si, irn, tmp) {
+ for (n=get_irn_arity(tmp)-1; n>=0; --n) {
+ ir_node *remat_arg = get_irn_n(tmp, n);
+ if(has_reg_class(si, remat_arg)) {
+ pset_insert_ptr(used, remat_arg);
+ }
}
}
- /* iterate over following remats and remove possibly defined values again from check_post_remat */
- foreach_post_remat(irn, tmp) {
- op_t *remat_op = get_irn_link(tmp);
- const ir_node *value = remat_op->attr.remat.remat->value;
- op_t *val_op = get_irn_link(value);
- assert(remat_op->is_remat && !remat_op->attr.remat.pre);
+ /**********************************
+ * I N E P I L O G O F irn
+ **********************************/
- /* values that are defined by remat2s are not counted */
-#ifdef REMAT_WHILE_LIVE
- assert(val_op->attr.live_range.ilp);
- lpp_set_factor_fast(si->lpp, check_post_remat, val_op->attr.live_range.ilp, 0.0);
-#else
- if(val_op->attr.live_range.ilp != ILP_UNDEF) {
- lpp_set_factor_fast(si->lpp, check_post_remat, val_op->attr.live_range.ilp, 0.0);
+ /* ensure each dying value is used by only one post remat */
+ pset_foreach(live, tmp) {
+ ir_node *value = tmp;
+ op_t *value_op = get_irn_link(value);
+ ir_node *remat;
+ int n_remats = 0;
+
+ cst = ILP_UNDEF;
+ foreach_post_remat(irn, remat) {
+ op_t *remat_op = get_irn_link(remat);
+
+ for(n=get_irn_arity(remat)-1; n>=0; --n) {
+ ir_node *remat_arg = get_irn_n(remat, n);
+
+ /* if value is used by this remat add it to constraint */
+ if(remat_arg == value) {
+ if(n_remats == 0) {
+ /* sum remat2s <= 1 + n_remats*live_range */
+ ir_snprintf(buf, sizeof(buf), "dying_lr_%N_%N", value, irn);
+ cst = lpp_add_cst(si->lpp, buf, lpp_less, 1.0);
+ }
+
+ n_remats++;
+ lpp_set_factor_fast(si->lpp, cst, remat_op->attr.remat.ilp, 1.0);
+ break;
+ }
+ }
+ }
+
+ if(value_op->attr.live_range.ilp != ILP_UNDEF && cst != ILP_UNDEF) {
+ lpp_set_factor_fast(si->lpp, cst, value_op->attr.live_range.ilp, -n_remats);
}
-#endif /* REMAT_WHILE_LIVE */
}
-#endif /* CHECK_POST_REMAT */
- /* new live ranges for values from L\U defined by remat2s or used by remats */
+
+ /* new live ranges for values from L\U defined by post remats */
pset_foreach(live, tmp) {
- ir_node *value = tmp;//remat_op->attr.remat.remat->value;
+ ir_node *value = tmp;
op_t *value_op = get_irn_link(value);
- if(!set_find_keyval(args, value)) {
+ if(!set_find_keyval(args, value) && !pset_find_ptr(defs, value)) {
ilp_var_t prev_lr = ILP_UNDEF;
ir_node *remat;
- cst = ILP_UNDEF;
-
- foreach_post_remat(irn, remat) {
- op_t *remat_op = get_irn_link(remat);
-
- /* if value is being rematerialized by this remat */
- if(value == remat_op->attr.remat.remat->value) {
- if(cst == ILP_UNDEF) {
- /* next_live_range <= prev_live_range + sum remat2s */
- ir_snprintf(buf, sizeof(buf), "next_lr_%N_%N", value, irn);
- cst = lpp_add_cst(si->lpp, buf, lpp_less, 0.0);
- ir_snprintf(buf, sizeof(buf), "lr_%N_%N", value, irn);
- prev_lr = lpp_add_var(si->lpp, buf, lpp_binary, 0.0);
- lpp_set_factor_fast(si->lpp, cst, value_op->attr.live_range.ilp, 1.0);
- lpp_set_factor_fast(si->lpp, cst, prev_lr, -1.0);
- }
- lpp_set_factor_fast(si->lpp, cst, remat_op->attr.remat.ilp, -1.0);
- }
- }
+ if(pset_find_ptr(remat_defs, value)) {
-#ifdef MAY_DIE_AT_PRE_REMAT
- if(cst == ILP_UNDEF) {
- foreach_pre_remat(si, irn, remat) {
- int n;
-
- for (n=get_irn_arity(remat)-1; n>=0; --n) {
- ir_node *remat_arg = get_irn_n(remat, n);
-
- /* if value is being used by this remat */
- if(value == remat_arg) {
- /* next_live_range <= prev_live_range */
- ir_snprintf(buf, sizeof(buf), "lr_%N_%N", value, irn);
- prev_lr = lpp_add_var(si->lpp, buf, lpp_binary, 0.0);
-
- ir_snprintf(buf, sizeof(buf), "next_lr_%N_%N", value, irn);
- cst = lpp_add_cst(si->lpp, buf, lpp_less, 0.0);
- lpp_set_factor_fast(si->lpp, cst, value_op->attr.live_range.ilp, 1.0);
- lpp_set_factor_fast(si->lpp, cst, prev_lr, -1.0);
- goto fertig;
- }
- /* TODO check afterwards whether lr dies after a pre-remat (should not happen) */
+ /* next_live_range <= prev_live_range + sum remat2s */
+ ir_snprintf(buf, sizeof(buf), "next_lr_%N_%N", value, irn);
+ cst = lpp_add_cst(si->lpp, buf, lpp_less, 0.0);
+
+ ir_snprintf(buf, sizeof(buf), "lr_%N_%N", value, irn);
+ prev_lr = lpp_add_var(si->lpp, buf, lpp_binary, 0.0);
+
+ lpp_set_factor_fast(si->lpp, cst, value_op->attr.live_range.ilp, 1.0);
+ lpp_set_factor_fast(si->lpp, cst, prev_lr, -1.0);
+
+ foreach_post_remat(irn, remat) {
+ op_t *remat_op = get_irn_link(remat);
+
+ /* if value is being rematerialized by this remat */
+ if(value == remat_op->attr.remat.remat->value) {
+ lpp_set_factor_fast(si->lpp, cst, remat_op->attr.remat.ilp, -1.0);
}
}
- }
-fertig:
-#endif
- if(prev_lr != ILP_UNDEF) {
value_op->attr.live_range.ilp = prev_lr;
value_op->attr.live_range.op = irn;
}
}
}
- /* get count of values in my register class defined by irn */
- /* also add defined values to check_post_remat; do this before iterating over args */
- if(get_irn_mode(irn) == mode_T) {
- ir_node *proj = sched_next(irn);
- op_t *proj_op = get_irn_link(proj);
+ /* requirements for post remats and start live ranges from L/U' for values dying here */
+ foreach_post_remat(irn, tmp) {
+ op_t *remat_op = get_irn_link(tmp);
+ int n;
- while(is_Proj(proj)) {
- if(has_reg_class(si, proj)) {
- ++d;
-#ifdef CHECK_POST_REMAT
- lpp_set_factor_fast(si->lpp, check_post_remat, proj_op->attr.live_range.ilp, 1.0);
-#endif
+ for (n=get_irn_arity(tmp)-1; n>=0; --n) {
+ ir_node *remat_arg = get_irn_n(tmp, n);
+ op_t *arg_op = get_irn_link(remat_arg);
+
+ if(!has_reg_class(si, remat_arg)) continue;
+
+ /* only for values in L\U (TODO and D?), the others are handled with post_use */
+ if(!pset_find_ptr(used, remat_arg)) {
+ /* remat <= live_rang(remat_arg) */
+ ir_snprintf(buf, sizeof(buf), "req_remat2_%N_arg_%N", tmp, remat_arg);
+ cst = lpp_add_cst(si->lpp, buf, lpp_less, 0.0);
+
+ /* if value is becoming live through use by remat2 */
+ if(!pset_find_ptr(live, remat_arg)) {
+ ilp_var_t lr;
+
+ ir_snprintf(buf, sizeof(buf), "lr_%N_%N", remat_arg, irn);
+ lr = lpp_add_var(si->lpp, buf, lpp_binary, 0.0);
+
+ arg_op->attr.live_range.ilp = lr;
+ arg_op->attr.live_range.op = irn;
+
+ DBG((si->dbg, LEVEL_3, " value %+F becoming live through use by remat2 %+F\n", remat_arg, tmp));
+
+ pset_insert_ptr(live, remat_arg);
+ add_to_spill_bb(si, bb, remat_arg);
+ }
+
+ lpp_set_factor_fast(si->lpp, cst, remat_op->attr.remat.ilp, 1.0);
+ lpp_set_factor_fast(si->lpp, cst, arg_op->attr.live_range.ilp, -1.0);
}
- proj = sched_next(proj);
- proj_op = get_irn_link(proj);
- }
- } else {
- if(has_reg_class(si, irn)) {
- d = 1;
-#ifdef CHECK_POST_REMAT
- lpp_set_factor_fast(si->lpp, check_post_remat, op->attr.live_range.ilp, 1.0);
-#endif
}
}
+
+ d = pset_count(defs);
DBG((si->dbg, LEVEL_4, "\t %+F produces %d values in my register class\n", irn, d));
/* count how many regs irn needs for arguments */
- k = set_count(args);
+ u = set_count(args);
- /* check the register pressure in the prolog */
- /* sum_{L\U} lr <= n - |U| */
- ir_snprintf(buf, sizeof(buf), "check_pre_%N", irn);
- check_pre = lpp_add_cst(si->lpp, buf, lpp_less, si->n_regs - k);
/* check the register pressure in the epilog */
+ /* sum_{L\U'} lr + sum_{U'} post_use <= k - |D| */
ir_snprintf(buf, sizeof(buf), "check_post_%N", irn);
check_post = lpp_add_cst(si->lpp, buf, lpp_less, si->n_regs - d);
- set_foreach(args, keyval) {
- ilp_var_t next_lr;
- op_t *arg_op;
+ /* add L\U' to check_post */
+ pset_foreach(live, tmp) {
+ if(!pset_find_ptr(used, tmp) && !pset_find_ptr(defs, tmp)) {
+ /* if a live value is not used by irn */
+ tmp_op = get_irn_link(tmp);
+ lpp_set_factor_fast(si->lpp, check_post, tmp_op->attr.live_range.ilp, 1.0);
+ }
+ }
+
+ /***********************************************************
+ * I T E R A T I O N O V E R U S E S F O R E P I L O G
+ **********************************************************/
+
+
+ pset_foreach(used, tmp) {
+ ilp_var_t prev_lr;
ilp_var_t post_use;
int p = 0;
spill_t *spill;
- ir_node *arg = keyval->key;
+ ir_node *arg = tmp;
+ op_t *arg_op = get_irn_link(arg);
+ ir_node *remat;
spill = add_to_spill_bb(si, bb, arg);
+ /* new live range for each used value */
ir_snprintf(buf, sizeof(buf), "lr_%N_%N", arg, irn);
- next_lr = lpp_add_var(si->lpp, buf, lpp_binary, 0.0);
-
- i = (int)keyval->val;
-
- ir_snprintf(buf, sizeof(buf), "reload_%N_%N", arg, irn);
- op->attr.live_range.args.reloads[i] = lpp_add_var(si->lpp, buf, lpp_binary, COST_LOAD*execution_frequency(si, bb));
-
- /* reload <= mem_out */
- cst = lpp_add_cst(si->lpp, buf, lpp_less, 0.0);
- lpp_set_factor_fast(si->lpp, cst, op->attr.live_range.args.reloads[i], 1.0);
- lpp_set_factor_fast(si->lpp, cst, spill->mem_out, -1.0);
-
- arg_op = get_irn_link(arg);
+ prev_lr = lpp_add_var(si->lpp, buf, lpp_binary, 0.0);
- /* requirement: arg must be in register for use */
- /* reload + remat + live_range == 1 */
- ir_snprintf(buf, sizeof(buf), "req_%N_%N", irn, arg);
- cst = lpp_add_cst(si->lpp, buf, lpp_equal, 1.0);
-
- lpp_set_factor_fast(si->lpp, cst, next_lr, 1.0);
- lpp_set_factor_fast(si->lpp, cst, op->attr.live_range.args.reloads[i], 1.0);
- foreach_pre_remat(si, irn, tmp) {
- op_t *remat_op = get_irn_link(tmp);
- if(remat_op->attr.remat.remat->value == arg) {
- lpp_set_factor_fast(si->lpp, cst, remat_op->attr.remat.ilp, 1.0);
- }
- }
-
- /* the epilog stuff - including post_use, post, post_remat */
+ /* the epilog stuff - including post_use, check_post, check_post_remat */
ir_snprintf(buf, sizeof(buf), "post_use_%N_%N", arg, irn);
post_use = lpp_add_var(si->lpp, buf, lpp_binary, 0.0);
if(pset_find_ptr(live, arg)) {
DBG((si->dbg, LEVEL_3, "\t arg %+F is possibly live in epilog of %+F\n", arg, irn));
+ /* post_use >= next_lr + remat */
ir_snprintf(buf, sizeof(buf), "post_use_%N_%N-%d", arg, irn, p++);
cst = lpp_add_cst(si->lpp, buf, lpp_less, 0.0);
lpp_set_factor_fast(si->lpp, cst, post_use, -1.0);
lpp_set_factor_fast(si->lpp, cst, arg_op->attr.live_range.ilp, 1.0);
-#ifdef CHECK_POST_REMAT
- lpp_set_factor_fast(si->lpp, check_post_remat, arg_op->attr.live_range.ilp, 1.0);
-#endif
}
- /*forall remat2 which use arg add a similar cst*/
- foreach_post_remat(irn, tmp) {
+ /* if value is not an arg of op and not possibly defined by post remat
+ * then it may only die and not become live
+ */
+ if(!set_find_keyval(args, arg)) {
+ /* post_use <= prev_lr */
+ ir_snprintf(buf, sizeof(buf), "req_post_use_%N_%N", arg, irn);
+ cst = lpp_add_cst(si->lpp, buf, lpp_less, 0.0);
+ lpp_set_factor_fast(si->lpp, cst, post_use, 1.0);
+ lpp_set_factor_fast(si->lpp, cst, prev_lr, -1.0);
+
+ if(!pset_find_ptr(remat_defs, arg) && pset_find_ptr(live, arg)) {
+ /* next_lr <= prev_lr */
+ ir_snprintf(buf, sizeof(buf), "next_lr_%N_%N", arg, irn);
+ cst = lpp_add_cst(si->lpp, buf, lpp_less, 0.0);
+ lpp_set_factor_fast(si->lpp, cst, arg_op->attr.live_range.ilp, 1.0);
+ lpp_set_factor_fast(si->lpp, cst, prev_lr, -1.0);
+ }
+ }
+
+
+
+ /* forall post remat which use arg add a similar cst */
+ foreach_post_remat(irn, remat) {
int n;
- for (n=get_irn_arity(tmp)-1; n>=0; --n) {
- ir_node *remat_arg = get_irn_n(tmp, n);
- op_t *remat_op = get_irn_link(tmp);
+ for (n=get_irn_arity(remat)-1; n>=0; --n) {
+ ir_node *remat_arg = get_irn_n(remat, n);
+ op_t *remat_op = get_irn_link(remat);
if(remat_arg == arg) {
DBG((si->dbg, LEVEL_3, "\t found remat with arg %+F in epilog of %+F\n", arg, irn));
}
}
- /* new live range begins for each argument */
- arg_op->attr.live_range.ilp = next_lr;
+ /* new live range begins for each used value */
+ arg_op->attr.live_range.ilp = prev_lr;
arg_op->attr.live_range.op = irn;
+ /*if(!pset_find_ptr(live, arg)) {
+ pset_insert_ptr(live, arg);
+ add_to_spill_bb(si, bb, arg);
+ }*/
pset_insert_ptr(live, arg);
+
}
- /* start new live ranges for values used by remats */
- foreach_pre_remat(si, irn, tmp) {
- int n;
+ /* just to be sure */
+ check_post = ILP_UNDEF;
- for (n=get_irn_arity(tmp)-1; n>=0; --n) {
- ir_node *remat_arg = get_irn_n(tmp, n);
- op_t *arg_op = get_irn_link(remat_arg);
- ilp_var_t prev_lr;
- if(!has_reg_class(si, remat_arg)) continue;
- /* if value is becoming live through use by remat */
- if(!pset_find_ptr(live, remat_arg)) {
- ir_snprintf(buf, sizeof(buf), "lr_%N_%N", remat_arg, irn);
- prev_lr = lpp_add_var(si->lpp, buf, lpp_binary, 0.0);
- arg_op->attr.live_range.ilp = prev_lr;
- arg_op->attr.live_range.op = irn;
+ /******************
+ * P R O L O G
+ ******************/
- DBG((si->dbg, LEVEL_4, " value %+F becoming live through use by remat %+F\n", remat_arg, tmp));
+ /* check the register pressure in the prolog */
+ /* sum_{L\U} lr <= k - |U| */
+ ir_snprintf(buf, sizeof(buf), "check_pre_%N", irn);
+ check_pre = lpp_add_cst(si->lpp, buf, lpp_less, si->n_regs - u);
+
+ /* for the prolog remove defined values from the live set */
+ pset_foreach(defs, tmp) {
+ pset_remove_ptr(live, tmp);
+ }
- /* TODO ist das hier die richtige Stelle???? */
- pset_insert_ptr(live, remat_arg);
- add_to_spill_bb(si, bb, remat_arg);
+ /***********************************************************
+ * I T E R A T I O N O V E R A R G S F O R P R O L O G
+ **********************************************************/
+
+
+ set_foreach(args, keyval) {
+ spill_t *spill;
+ ir_node *arg = keyval->key;
+ int i = PTR_TO_INT(keyval->val);
+ op_t *arg_op = get_irn_link(arg);
+
+ spill = set_find_spill(spill_bb->ilp, arg);
+ assert(spill);
+
+ ir_snprintf(buf, sizeof(buf), "reload_%N_%N", arg, irn);
+ op->attr.live_range.args.reloads[i] = lpp_add_var(si->lpp, buf, lpp_binary, COST_LOAD*execution_frequency(si, bb));
+
+ /* reload <= mem_out */
+ ir_snprintf(buf, sizeof(buf), "req_reload_%N_%N", arg, irn);
+ cst = lpp_add_cst(si->lpp, buf, lpp_less, 0.0);
+ lpp_set_factor_fast(si->lpp, cst, op->attr.live_range.args.reloads[i], 1.0);
+ lpp_set_factor_fast(si->lpp, cst, spill->mem_out, -1.0);
+
+ /* requirement: arg must be in register for use */
+ /* reload + remat + live_range == 1 */
+ ir_snprintf(buf, sizeof(buf), "req_%N_%N", irn, arg);
+ cst = lpp_add_cst(si->lpp, buf, lpp_equal, 1.0);
+
+ lpp_set_factor_fast(si->lpp, cst, arg_op->attr.live_range.ilp, 1.0);
+ lpp_set_factor_fast(si->lpp, cst, op->attr.live_range.args.reloads[i], 1.0);
+ foreach_pre_remat(si, irn, tmp) {
+ op_t *remat_op = get_irn_link(tmp);
+ if(remat_op->attr.remat.remat->value == arg) {
+ lpp_set_factor_fast(si->lpp, cst, remat_op->attr.remat.ilp, 1.0);
}
- /* TODO check afterwards whether lr dies after a pre-remat (should not happen) */
}
}
if(!set_find_keyval(args, tmp)) {
/* if a live value is not used by irn */
tmp_op = get_irn_link(tmp);
-// assert(tmp_op->attr.live_range.op != irn);
lpp_set_factor_fast(si->lpp, check_pre, tmp_op->attr.live_range.ilp, 1.0);
- lpp_set_factor_fast(si->lpp, check_post, tmp_op->attr.live_range.ilp, 1.0);
}
}
+
/* requirements for remats */
+ /* start new live ranges for values used by remats */
foreach_pre_remat(si, irn, tmp) {
op_t *remat_op = get_irn_link(tmp);
int n;
for (n=get_irn_arity(tmp)-1; n>=0; --n) {
ir_node *remat_arg = get_irn_n(tmp, n);
op_t *arg_op = get_irn_link(remat_arg);
+ ilp_var_t prev_lr;
if(!has_reg_class(si, remat_arg)) continue;
}
}
- /* requirements for remats2
- *
- * TODO unsure if this does the right thing.
- * should insert values into set if they do not become live through remat and
- * op
- */
- foreach_post_remat(irn, tmp) {
- op_t *remat_op = get_irn_link(tmp);
- int n;
-
- for (n=get_irn_arity(tmp)-1; n>=0; --n) {
- ir_node *remat_arg = get_irn_n(tmp, n);
- op_t *arg_op = get_irn_link(remat_arg);
- if(!has_reg_class(si, remat_arg)) continue;
-
- /* only for values in L\U, the others are handled with post_use */
- if(!set_find_keyval(args, remat_arg)) {
- /* remat <= live_rang(remat_arg) */
- ir_snprintf(buf, sizeof(buf), "req_remat2_%N_arg_%N", tmp, remat_arg);
- cst = lpp_add_cst(si->lpp, buf, lpp_less, 0.0);
-
- /* if value is becoming live through use by remat2 */
- if(!pset_find_ptr(live, remat_arg)) {
- ilp_var_t lr;
-
- ir_snprintf(buf, sizeof(buf), "lr_%N_%N", remat_arg, irn);
- lr = lpp_add_var(si->lpp, buf, lpp_binary, 0.0);
-
- arg_op->attr.live_range.ilp = lr;
- arg_op->attr.live_range.op = irn;
-
- DBG((si->dbg, LEVEL_3, " value %+F becoming live through use by remat2 %+F\n", remat_arg, tmp));
-
- pset_insert_ptr(live, remat_arg);
- add_to_spill_bb(si, bb, remat_arg);
- }
-
- lpp_set_factor_fast(si->lpp, cst, remat_op->attr.remat.ilp, 1.0);
- lpp_set_factor_fast(si->lpp, cst, arg_op->attr.live_range.ilp, -1.0);
- }
- }
- }
-
-#ifdef CHECK_POST_REMAT
- /* iterate over following remats and add them to check_post_remat */
- foreach_post_remat(irn, tmp) {
- op_t *remat_op = get_irn_link(tmp);
-
- assert(remat_op->is_remat && !remat_op->attr.remat.pre);
-
- lpp_set_factor_fast(si->lpp, check_post_remat, remat_op->attr.remat.ilp, 1.0);
- }
-#endif
+ /*************************
+ * D O N E W I T H O P
+ *************************/
DBG((si->dbg, LEVEL_4, "\t %d values live at %+F\n", pset_count(live), irn));
assert(!find_post_remat(arg, irn) && "there should be no post remat for an argument of an op");
}
+ del_pset(remat_defs);
+ del_pset(used);
del_set(args);
+ del_pset(defs);
+ defs = pset_new_ptr_default();
}
- /* do something at the beginning of the block */
+ /***************************************
+ * B E G I N N I N G O F B L O C K
+ ***************************************/
+
/* we are now at the beginning of the basic block, there are only \Phis in front of us */
DBG((si->dbg, LEVEL_3, "\t %d values live at beginning of block %+F\n", pset_count(live), bb));
lpp_set_factor_fast(si->lpp, cst, spill->reg_in, 1.0);
- /* spill + reg_in <= 1 */
+ /* spill + mem_in <= 1 */
ir_snprintf(buf, sizeof(buf), "nospill_%N_%N", irn, bb);
nospill = lpp_add_cst(si->lpp, buf, lpp_less, 1);
- lpp_set_factor_fast(si->lpp, nospill, spill->reg_in, 1.0);
+ lpp_set_factor_fast(si->lpp, nospill, spill->mem_in, 1.0);
lpp_set_factor_fast(si->lpp, nospill, spill->spill, 1.0);
}
lpp_set_factor_fast(si->lpp, cst, remat_op->attr.remat.ilp, 1.0);
}
- /* forall remat2 add requirements */
+ /* forall post remats add requirements */
foreach_post_remat(bb, tmp) {
int n;
spill = set_find_spill(spill_bb->ilp, remat_arg);
assert(spill);
- /* TODO verify this is placed correctly */
+ /* remat <= reg_in_argument */
ir_snprintf(buf, sizeof(buf), "req_remat2_%N_%N_arg_%N", tmp, bb, remat_arg);
cst = lpp_add_cst(si->lpp, buf, lpp_less, 0.0);
lpp_set_factor_fast(si->lpp, cst, spill->reg_in, -1.0);
/* this must only be done for values that are not defined in this block */
/* TODO are these values at start of block? if yes, just check whether this is a diverge edge and skip the loop */
pset_foreach(live, irn) {
+ /*
+ * if value is defined in this block we can anways place the spill directly after the def
+ * -> no constraint necessary
+ */
+ if(!is_Phi(irn) && get_nodes_block(irn) == bb) continue;
+
+
spill = set_find_spill(spill_bb->ilp, irn);
assert(spill);
lpp_set_factor_fast(si->lpp, cst, spill->spill, 1.0);
if(is_diverge_edge(bb)) lpp_set_factor_fast(si->lpp, cst, spill->reg_in, -1.0);
- sched_foreach_op(bb, tmp) {
- op_t *op = get_irn_link(tmp);
+ if(!is_Phi(irn)) {
+ sched_foreach_op(bb, tmp) {
+ op_t *op = get_irn_link(tmp);
- if(is_Phi(tmp)) continue;
- assert(!is_Proj(tmp));
+ if(is_Phi(tmp)) continue;
+ assert(!is_Proj(tmp));
- if(op->is_remat) {
- ir_node *value = op->attr.remat.remat->value;
+ if(op->is_remat) {
+ ir_node *value = op->attr.remat.remat->value;
- if(value == irn) {
- /* only collect remats up to the first use of a value */
- lpp_set_factor_fast(si->lpp, cst, op->attr.remat.ilp, -1.0);
- }
- } else {
- int n;
+ if(value == irn) {
+ /* only collect remats up to the first use of a value */
+ lpp_set_factor_fast(si->lpp, cst, op->attr.remat.ilp, -1.0);
+ }
+ } else {
+ int n;
- for (n=get_irn_arity(tmp)-1; n>=0; --n) {
- ir_node *arg = get_irn_n(tmp, n);
+ for (n=get_irn_arity(tmp)-1; n>=0; --n) {
+ ir_node *arg = get_irn_n(tmp, n);
- if(arg == irn) {
- /* if a value is used stop collecting remats */
- cst = ILP_UNDEF;
+ if(arg == irn) {
+ /* if a value is used stop collecting remats */
+ cst = ILP_UNDEF;
+ }
+ break;
}
- break;
}
+ if(cst == ILP_UNDEF) break;
}
- if(cst == ILP_UNDEF) break;
}
}
-
- /* if a value is used by a mem-phi, then mem_in of this value is 0 (has to be spilled again into a different slot)
- mem_in(phi) -> not mem_in(orig_value) TODO: how does this depend on a certain predecessor?
- */
-
- /* mem_in of mem-phi has associated costs (but first one is free) */
- /* define n_mem_copies as positive integer in each predecessor block,
- #mem_in into this block from predecessor block - 1 weighted with SPILL_COST*execfreq(predecessor)
- TODO
- */
-
-
del_pset(live);
}
cst;
const ir_node *a = interference->a;
const ir_node *b = interference->b;
- struct list_head *pos;
/* any_interf <= \sum interf */
ir_snprintf(buf, sizeof(buf), "interfere_%N_%N", a, b);
char buf[256];
query.irn = a;
- spilla = set_find(spill_bb->ilp, &query, sizeof(query), HASH_PTR(a));
+ spilla = set_find_spill(spill_bb->ilp, a);
assert(spilla);
query.irn = b;
- spillb = set_find(spill_bb->ilp, &query, sizeof(query), HASH_PTR(b));
+ spillb = set_find_spill(spill_bb->ilp, b);
assert(spillb);
/* interfere <-> (mem_in_a or spill_a) and (mem_in_b or spill_b): */
name = si->lpp->vars[spill->spill];
if(!is_zero(name->value)) {
+ /* place spill directly after definition */
+ if(get_nodes_block(spill->irn) == bb) {
+ insert_spill(si, spill->irn, spill->irn, spill->irn);
+ continue;
+ }
+
+ /* place spill at bb start */
if(spill->reg_in > 0) {
name = si->lpp->vars[spill->reg_in];
if(!is_zero(name->value)) {
continue;
}
}
+ /* place spill after a remat */
pset_insert_ptr(spills_to_do, spill->irn);
}
}
int i;
irn_live_t *li;
+ /* reloads at end of block */
+ if(spill_bb->reloads) {
+ keyval_t *keyval;
+
+ set_foreach(spill_bb->reloads, keyval) {
+ ir_node *irn = (ir_node*)keyval->key;
+ ilp_var_t reload = PTR_TO_INT(keyval->val);
+ lpp_name_t *name;
+
+ name = si->lpp->vars[reload];
+ if(!is_zero(name->value)) {
+ ir_node *reload;
+ ir_node *insert_pos = bb;
+ ir_node *prev = sched_block_last_noncf(si, bb);
+ op_t *prev_op = get_irn_link(prev);
+
+ /* insert reload before pre-remats */
+ while(!sched_is_end(prev) && !be_is_Reload(prev) && !be_is_Spill(prev)
+ && prev_op->is_remat && prev_op->attr.remat.pre) {
+ insert_pos = prev;
+
+ prev = sched_prev(insert_pos);
+ prev_op = get_irn_link(prev);
+ }
+
+ reload = insert_reload(si, irn, insert_pos);
+
+#ifdef KEEPALIVE_RELOADS
+ pset_insert_ptr(si->spills, reload);
+#endif
+ }
+ }
+ }
+
+ /* walk and insert more reloads and collect remats */
sched_foreach_reverse(bb, irn) {
op_t *op = get_irn_link(irn);
}
}
- /* reloads at end of block */
- if(spill_bb->reloads) {
- keyval_t *keyval;
-
- set_foreach(spill_bb->reloads, keyval) {
- ir_node *irn = (ir_node*)keyval->key;
- ilp_var_t reload = PTR_TO_INT(keyval->val);
- lpp_name_t *name;
-
- name = si->lpp->vars[reload];
- if(!is_zero(name->value)) {
- ir_node *reload;
- ir_node *insert_pos = bb;
- ir_node *prev = sched_prev(insert_pos);
- op_t *prev_op = get_irn_link(prev);
-
- /* insert reload before pre-remats */
- while(!sched_is_end(prev) && !be_is_Reload(prev) && !be_is_Spill(prev)
- && prev_op->is_remat && prev_op->attr.remat.pre) {
- insert_pos = prev;
-
- prev = sched_prev(insert_pos);
- prev_op = get_irn_link(prev);
- }
-
- reload = insert_reload(si, irn, insert_pos);
-
-#ifdef KEEPALIVE_RELOADS
- pset_insert_ptr(si->spills, reload);
-#endif
- }
- }
- }
-
del_set(spill_bb->ilp);
if(spill_bb->reloads) del_set(spill_bb->reloads);
}
if(!lc_bitset_is_set(kh->used, get_irn_idx(irn))) {
if(be_is_Spill(irn) || be_is_Reload(irn)) {
DBG((kh->si->dbg, LEVEL_1, "\t SUBOPTIMAL! %+F IS UNUSED (cost: %g)\n", irn, get_cost(kh->si, irn)*execution_frequency(kh->si, bb)));
+#if 0
assert(lpp_get_sol_state(kh->si->lpp) != lpp_optimal && "optimal solution is suboptimal?");
+#endif
}
sched_remove(irn);
dump_graph_with_remats(chordal_env->irg, dump_suffix);
#endif
+ /* insert copies for phi arguments not in my regclass */
+ irg_walk_graph(chordal_env->irg, walker_regclass_copy_insertor, NULL, &si);
/* recompute liveness */
DBG((si.dbg, LEVEL_1, "Recomputing liveness\n"));
// move reloads upwards
be_liveness(chordal_env->irg);
- irg_block_walk_graph(chordal_env->irg, walker_pressure_annotator, NULL, &si);
- move_reloads_upward(&si);
+ //irg_block_walk_graph(chordal_env->irg, walker_pressure_annotator, NULL, &si);
+ //move_reloads_upward(&si);
irg_block_walk_graph(chordal_env->irg, walker_pressure_annotator, NULL, &si);
projects / libfirm / blobdiff