#define DBG_WSETS 2
#define DBG_FIX 4
#define DBG_SPILL 8
+#define DBG_START 16
#define DBG_TRACE 32
-#define DEBUG_LVL (DBG_DECIDE | DBG_WSETS | DBG_FIX | DBG_SPILL)
+#define DEBUG_LVL (DBG_START | DBG_DECIDE | DBG_WSETS | DBG_FIX | DBG_SPILL)
static firm_dbg_module_t *dbg = NULL;
-
typedef struct _workset_t workset_t;
typedef struct _block_info_t block_info_t;
-typedef struct _reloader_t reloader_t;
-typedef struct _spill_info_t spill_info_t;
-typedef struct _spill_ctx_t spill_ctx_t;
typedef struct _belady_env_t belady_env_t;
struct _workset_t {
workset_t *ws_start, *ws_end;
};
-struct _reloader_t {
- reloader_t *next;
- ir_node *reloader;
-};
-
-struct _spill_info_t {
- ir_node *spilled_node;
- reloader_t *reloaders;
-};
-
-struct _spill_ctx_t {
- ir_node *spilled; /**< The spilled node. */
- ir_node *user; /**< The node this spill is for. */
- ir_node *spill; /**< The spill itself. */
-};
-
struct _belady_env_t {
struct obstack ob;
- const be_main_session_env_t *session;
const be_node_factory_t *factory;
const arch_env_t *arch;
const arch_register_class_t *cls;
ir_node *instr; /**< current instruction */
unsigned instr_nr; /**< current instruction number (relative to block start) */
pset *used; /**< holds the values used (so far) in the current BB */
- set *spills; /**< all spill_info_t's, which must be placed */
- set *spill_ctxs; /**< all spill contexts (multiple spilling and stop recursion) */
- pset *mem_phis; /**< all phis which must be converted to memory phis */
+ spill_env_t *senv; /* see bespill.h */
pset *reloads; /**< all reload nodes placed */
};
-static int set_cmp_spillinfo(const void *x, const void *y, size_t size) {
- const spill_info_t *xx = x;
- const spill_info_t *yy = y;
- return ! (xx->spilled_node == yy->spilled_node);
-}
-
-static int set_cmp_spillctx(const void *a, const void *b, size_t n) {
- const spill_ctx_t *p = a;
- const spill_ctx_t *q = b;
- return !(p->user == q->user && p->spilled == q->spilled);
-}
-
/**
* Alloc a new workset on obstack @p ob with maximum size @p max
*/
}
}
-static INLINE int workset_contains(const workset_t *ws, ir_node *val) {
+static INLINE int workset_contains(const workset_t *ws, const ir_node *val) {
int i;
for(i=0; i<ws->len; ++i)
if (ws->vals[i].irn == val)
sched_foreach(blk, irn)
if (is_Phi(irn) && arch_get_irn_reg_class(bel->arch, irn, 0) == bel->cls) {
loc.irn = irn;
- loc.time = be_get_next_use(bel->uses, first, 0, irn);
+ loc.time = be_get_next_use(bel->uses, first, 0, irn, 0);
+ DBG((dbg, DBG_START, " %+F next-use %d\n", loc.irn, loc.time));
obstack_grow(&ob, &loc, sizeof(loc));
count++;
} else
live_foreach(blk, li)
if (live_is_in(li) && arch_get_irn_reg_class(bel->arch, li->irn, 0) == bel->cls) {
loc.irn = (ir_node *)li->irn;
- loc.time = be_get_next_use(bel->uses, first, 0, li->irn);
+ loc.time = be_get_next_use(bel->uses, first, 0, li->irn, 0);
+ DBG((dbg, DBG_START, " %+F next-use %d\n", loc.irn, loc.time));
obstack_grow(&ob, &loc, sizeof(loc));
count++;
}
if (!workset_contains(ws, val)) {
DBG((dbg, DBG_DECIDE, " insert %+F\n", val));
to_insert[demand++] = val;
-
- if (is_usage) {
- spill_info_t si, *found;
- reloader_t *rld;
-
- /* find the spill info or create it */
- si.spilled_node = val;
- si.reloaders = NULL;
- found = set_insert(bel->spills, &si, sizeof(si), HASH_PTR(si.spilled_node));
-
- /* insert the reloader into the linked list */
- rld = obstack_alloc(&bel->ob, sizeof(*rld));
- rld->reloader = bel->instr;
- rld->next = found->reloaders;
- found->reloaders = rld;
- }
+ if (is_usage)
+ be_add_spill(bel->senv, val, bel->instr);
} else
DBG((dbg, DBG_DECIDE, " skip %+F\n", val));
}
if (len > max_allowed) {
/* get current next-use distance */
for (i=0; i<ws->len; ++i)
- workset_set_time(ws, i, be_get_next_use(bel->uses, bel->instr, bel->instr_nr, workset_get_val(ws, i)));
+ workset_set_time(ws, i, be_get_next_use(bel->uses, bel->instr, bel->instr_nr, workset_get_val(ws, i), is_usage));
/* sort entries by increasing nextuse-distance*/
workset_sort(ws);
bel->instr_nr = 0;
new_vals = new_workset(&bel->ob, bel);
sched_foreach(blk, irn) {
- DBG((dbg, DBG_DECIDE, " %+F\n", irn));
+ ir_node *iii;
+ DBG((dbg, DBG_WSETS, "Current workset for %+F:\n", blk));
+ workset_foreach(bel->ws, iii)
+ DBG((dbg, DBG_WSETS, " %+F\n", iii));
+ assert(workset_get_length(bel->ws) <= bel->n_regs && "Too much values in workset!");
+
+ DBG((dbg, DBG_DECIDE, " ...%+F\n", irn));
/* projs are handled with the tuple value.
* Phis are no real instr (see insert_starters)
DBG((dbg, DBG_FIX, " Pred %+F\n", pred));
workset_foreach(wsb, irnb) {
- spill_info_t si, *found;
- reloader_t *rld;
-
/* if irnb is a phi of the current block we reload
* the corresponding argument, else irnb itself */
if(is_Phi(irnb) && blk == get_nodes_block(irnb))
goto next_value;
/* irnb is in memory at the end of pred, so we have to reload it */
-
- /* find the spill info or create it */
- si.spilled_node = irnb;
- si.reloaders = NULL;
- found = set_insert(bel->spills, &si, sizeof(si), HASH_PTR(si.spilled_node));
-
- /* insert the reloader into the linked list.
- * the schedule position depends on the cf-situation of the block */
- rld = obstack_alloc(&bel->ob, sizeof(*rld));
- rld->reloader = (max==1) ? sched_skip(sched_first(blk), 1, sched_skip_phi_predicator, NULL) : pred;
- rld->next = found->reloaders;
- found->reloaders = rld;
-
- DBG((dbg, DBG_FIX, " reload %+F before %+F\n", irnb, rld->reloader));
+ be_add_spill_on_edge(bel->senv, irnb, blk, i);
next_value:
/*epsilon statement :)*/;
}
}
-static INLINE spill_ctx_t *get_spill_ctx(set *sc, ir_node *to_spill, ir_node *ctx_irn) {
- spill_ctx_t templ;
-
- templ.spilled = to_spill;
- templ.user = ctx_irn;
- templ.spill = NULL;
-
- return set_insert(sc, &templ, sizeof(templ), HASH_COMBINE(HASH_PTR(to_spill), HASH_PTR(ctx_irn)));
-}
-
-static INLINE ir_node *spill_irn(belady_env_t *bel, ir_node *irn, ir_node *ctx_irn) {
- spill_ctx_t *ctx;
- DBG((dbg, DBG_SPILL, "spill_irn %+F\n", irn));
-
- ctx = get_spill_ctx(bel->spill_ctxs, irn, ctx_irn);
- if(!ctx->spill)
- ctx->spill = be_spill(bel->factory, bel->arch, irn);
-
- return ctx->spill;
-}
-
-/**
- * If the first usage of a phi result would be out of memory
- * there is no sense in allocating a register for it.
- * Thus we spill it and all its operands to the same spill slot.
- * Therefore the phi/dataB becomes a phi/Memory
- */
-static ir_node *spill_phi(belady_env_t *bel, ir_node *phi, ir_node *ctx_irn) {
- int i, n = get_irn_arity(phi);
- ir_node **ins, *bl = get_nodes_block(phi);
- ir_graph *irg = get_irn_irg(bl);
- spill_ctx_t *ctx;
-
- assert(is_Phi(phi));
- DBG((dbg, DBG_SPILL, "spill_phi %+F\n", phi));
-
- /* search an existing spill for this context */
- ctx = get_spill_ctx(bel->spill_ctxs, phi, ctx_irn);
-
- /* if not found spill the phi */
- if(!ctx->spill) {
- /* build a new PhiM with dummy in-array */
- ins = malloc(n * sizeof(ins[0]));
- for(i=0; i<n; ++i)
- ins[i] = new_r_Unknown(irg, mode_M);
- ctx->spill = new_r_Phi(bel->session->irg, bl, n, ins, mode_M);
- free(ins);
-
- /* re-wire the phiM */
- for(i=0; i<n; ++i) {
- ir_node *arg = get_irn_n(phi, i);
- ir_node *sub_res;
-
- if(is_Phi(arg) && pset_find_ptr(bel->mem_phis, arg))
- sub_res = spill_phi(bel, arg, ctx_irn);
- else
- sub_res = spill_irn(bel, arg, ctx_irn);
-
- set_irn_n(ctx->spill, i, sub_res);
- }
- }
- return ctx->spill;
-}
-
-static ir_node *spill_node(belady_env_t *bel, ir_node *to_spill) {
- ir_node *res;
- if (pset_find_ptr(bel->mem_phis, to_spill))
- res = spill_phi(bel, to_spill, to_spill);
- else
- res = spill_irn(bel, to_spill, to_spill);
-
- return res;
-}
-
-static void insert_spills_reloads(ir_graph *irg, belady_env_t *bel) {
- ir_node *irn;
- spill_info_t *si;
- struct obstack ob;
- obstack_init(&ob);
-
- /* get all special spilled phis */
- for(si = set_first(bel->spills); si; si = set_next(bel->spills)) {
- irn = si->spilled_node;
- if (is_Phi(irn)) {
- ir_node *blk = get_nodes_block(irn);
- workset_t *sws = ((block_info_t *)get_irn_link(blk))->ws_start;
- if (!workset_contains(sws, irn))
- pset_insert_ptr(bel->mem_phis, irn);
- }
- }
-
- /* process each spilled node */
- for(si = set_first(bel->spills); si; si = set_next(bel->spills)) {
- reloader_t *rld;
- ir_node **reloads;
- int n_reloads = 0;
- ir_mode *mode = get_irn_mode(si->spilled_node);
-
- /* go through all reloads for this spill */
- for(rld = si->reloaders; rld; rld = rld->next) {
- /* the spill for this reloader */
- ir_node *spill = spill_node(bel, si->spilled_node);
-
- /* the reload */
- ir_node *bl = is_Block(rld->reloader) ? rld->reloader : get_nodes_block(rld->reloader);
- ir_node *reload = new_Reload(bel->factory, bel->cls, irg, bl, mode, spill);
- pset_insert_ptr(bel->reloads, reload);
-
- /* remember the reaload */
- obstack_ptr_grow(&ob, reload);
- sched_add_before(rld->reloader, reload);
- n_reloads++;
- }
-
- assert(n_reloads > 0);
- reloads = obstack_finish(&ob);
- be_introduce_copies_ignore(bel->session->dom_front, si->spilled_node, n_reloads, reloads, bel->mem_phis);
- obstack_free(&ob, reloads);
- }
-
- obstack_free(&ob, NULL);
-
- /* remove all special phis form the irg and the schedule */
- for(irn = pset_first(bel->mem_phis); irn; irn = pset_next(bel->mem_phis)) {
- int i, n;
- for(i = 0, n = get_irn_arity(irn); i < n; ++i)
- set_irn_n(irn, i, new_r_Bad(irg));
- sched_remove(irn);
- }
-}
-
/**
* Removes all used reloads from bel->reloads.
* The remaining nodes in bel->reloads will be removed from the graph.
*/
static void rescue_used_reloads(ir_node *irn, void *env) {
pset *rlds = ((belady_env_t *)env)->reloads;
- if (pset_find_ptr(rlds, irn))
+ if (pset_find_ptr(rlds, irn)) {
+ DBG((dbg, DBG_SPILL, "Removing %+F in %+F\n", irn, get_nodes_block(irn)));
pset_remove_ptr(rlds, irn);
+ }
+}
+
+static int is_mem_phi(const ir_node *irn, void *data) {
+ ir_node *blk = get_nodes_block(irn);
+ workset_t *sws = ((block_info_t *)get_irn_link(blk))->ws_start;
+ return !workset_contains(sws, irn);
}
void be_spill_belady(const be_main_session_env_t *session, const arch_register_class_t *cls) {
/* init belady env */
belady_env_t *bel = alloca(sizeof(*bel));
obstack_init(&bel->ob);
- bel->session = session;
bel->factory = session->main_env->node_factory;
bel->arch = session->main_env->arch_env;
bel->cls = cls;
bel->n_regs = arch_register_class_n_regs(cls);
bel->ws = new_workset(&bel->ob, bel);
bel->uses = be_begin_uses(session->irg, session->main_env->arch_env, cls);
- bel->spills = new_set(set_cmp_spillinfo, 32);
- bel->spill_ctxs = new_set(set_cmp_spillctx, 32);
- bel->mem_phis = pset_new_ptr_default();
+ bel->senv = be_new_spill_env(dbg, session, cls);
bel->reloads = pset_new_ptr_default();
/* do the work */
irg_block_walk_graph(session->irg, decide, NULL, bel);
irg_block_walk_graph(session->irg, fix_block_borders, NULL, bel);
- insert_spills_reloads(session->irg, bel);
+ be_insert_spills_reloads(bel->senv, bel->reloads, is_mem_phi, NULL);
/* find all unused reloads and remove them from the schedule */
irg_walk_graph(session->irg, rescue_used_reloads, NULL, bel);
/* clean up */
del_pset(bel->reloads);
- del_pset(bel->mem_phis);
- del_set(bel->spill_ctxs);
- del_set(bel->spills);
+ be_delete_spill_env(bel->senv);
be_end_uses(bel->uses);
obstack_free(&bel->ob, NULL);
}
projects / libfirm / blobdiff