2 * Author: Daniel Grund, Sebastian Hack
4 * Copyright: (c) Universitaet Karlsruhe
5 * Licence: This file protected by GPL - GNU GENERAL PUBLIC LICENSE.
11 #include "iredges_t.h"
18 typedef struct _reloader_t reloader_t;
19 typedef struct _spill_info_t spill_info_t;
26 struct _spill_info_t {
27 ir_node *spilled_node;
28 reloader_t *reloaders;
31 typedef struct _spill_ctx_t {
32 ir_node *spilled; /**< The spilled node. */
33 ir_node *user; /**< The node this spill is for. */
34 ir_node *spill; /**< The spill itself. */
38 firm_dbg_module_t *dbg;
39 const arch_register_class_t *cls;
40 const be_main_session_env_t *session;
43 set *spills; /**< all spill_info_t's, which must be placed */
44 pset *mem_phis; /**< set of all special spilled phis. allocated and freed seperately */
45 decide_irn_t is_mem_phi; /**< callback func to decide if a phi needs special spilling */
46 void *data; /**< data passed to all callbacks */
49 static int cmp_spillctx(const void *a, const void *b, size_t n) {
50 const spill_ctx_t *p = a;
51 const spill_ctx_t *q = b;
52 return !(p->user == q->user && p->spilled == q->spilled);
55 static int cmp_spillinfo(const void *x, const void *y, size_t size) {
56 const spill_info_t *xx = x;
57 const spill_info_t *yy = y;
58 return ! (xx->spilled_node == yy->spilled_node);
61 spill_env_t *be_new_spill_env(firm_dbg_module_t *dbg, const be_main_session_env_t *session,
62 const arch_register_class_t *cls, decide_irn_t is_mem_phi, void *data) {
63 spill_env_t *env = malloc(sizeof(env[0]));
64 env->spill_ctxs = new_set(cmp_spillctx, 1024);
65 env->spills = new_set(cmp_spillinfo, 1024);
66 env->session = session;
69 env->is_mem_phi = is_mem_phi;
71 obstack_init(&env->obst);
75 void be_delete_spill_env(spill_env_t *senv) {
76 del_set(senv->spill_ctxs);
77 del_set(senv->spills);
78 obstack_free(&senv->obst, NULL);
82 static spill_ctx_t *be_get_spill_ctx(set *sc, ir_node *to_spill, ir_node *ctx_irn) {
85 templ.spilled = to_spill;
89 return set_insert(sc, &templ, sizeof(templ), HASH_COMBINE(HASH_PTR(to_spill), HASH_PTR(ctx_irn)));
92 static ir_node *be_spill_irn(spill_env_t *senv, ir_node *irn, ir_node *ctx_irn) {
94 DBG((senv->dbg, LEVEL_1, "%+F in ctx %+F\n", irn, ctx_irn));
96 ctx = be_get_spill_ctx(senv->spill_ctxs, irn, ctx_irn);
98 const be_main_env_t *env = senv->session->main_env;
99 ctx->spill = be_spill(env->node_factory, env->arch_env, irn);
106 * If the first usage of a phi result would be out of memory
107 * there is no sense in allocating a register for it.
108 * Thus we spill it and all its operands to the same spill slot.
109 * Therefore the phi/dataB becomes a phi/Memory
111 static ir_node *be_spill_phi(spill_env_t *senv, ir_node *phi, ir_node *ctx_irn) {
112 int i, n = get_irn_arity(phi);
113 ir_node **ins, *bl = get_nodes_block(phi);
114 ir_graph *irg = senv->session->irg;
118 DBG((senv->dbg, LEVEL_1, "%+F in ctx %+F\n", phi, ctx_irn));
120 /* search an existing spill for this context */
121 ctx = be_get_spill_ctx(senv->spill_ctxs, phi, ctx_irn);
123 /* if not found spill the phi */
125 /* build a new PhiM with dummy in-array */
126 ins = malloc(n * sizeof(ins[0]));
128 ins[i] = new_r_Unknown(irg, mode_M);
129 ctx->spill = new_r_Phi(senv->session->irg, bl, n, ins, mode_M);
132 /* re-wire the phiM */
134 ir_node *arg = get_irn_n(phi, i);
137 if(is_Phi(arg) && pset_find_ptr(senv->mem_phis, arg))
138 sub_res = be_spill_phi(senv, arg, ctx_irn);
140 sub_res = be_spill_irn(senv, arg, ctx_irn);
142 set_irn_n(ctx->spill, i, sub_res);
148 static ir_node *be_spill_node(spill_env_t *senv, ir_node *to_spill) {
150 if (pset_find_ptr(senv->mem_phis, to_spill))
151 res = be_spill_phi(senv, to_spill, to_spill);
153 res = be_spill_irn(senv, to_spill, to_spill);
158 static void phi_walker(ir_node *irn, void *env) {
159 spill_env_t *senv = env;
160 const arch_env_t *arch = senv->session->main_env->arch_env;
162 if (is_Phi(irn) && arch_irn_has_reg_class(arch, irn, 0, senv->cls)
163 && senv->is_mem_phi(irn, senv->data)) {
164 DBG((senv->dbg, LEVEL_1, " %+F\n", irn));
165 pset_insert_ptr(senv->mem_phis, irn);
169 void be_insert_spills_reloads(spill_env_t *senv, pset *reload_set) {
170 ir_graph *irg = senv->session->irg;
177 /* get all special spilled phis */
178 DBG((senv->dbg, LEVEL_1, "Mem-phis:\n"));
179 senv->mem_phis = pset_new_ptr_default();
180 irg_walk_graph(senv->session->irg, phi_walker, NULL, senv);
182 /* Add reloads for mem_phis */
183 /* BETTER: These reloads (1) should only be inserted, if they are really needed */
184 DBG((senv->dbg, LEVEL_1, "Reloads for mem-phis:\n"));
185 for(irn = pset_first(senv->mem_phis); irn; irn = pset_next(senv->mem_phis)) {
187 DBG((senv->dbg, LEVEL_1, " Mem-phi %+F\n", irn));
188 foreach_out_edge(irn, e) {
189 ir_node *user = e->src;
190 if (is_Phi(user) && !pset_find_ptr(senv->mem_phis, user)) {
191 DBG((senv->dbg, LEVEL_1, " non-mem-phi user %+F\n", user));
192 ir_node *use_bl = get_nodes_block(user);
193 be_add_reload_on_edge(senv, irn, use_bl, e->pos); /* (1) */
198 /* process each spilled node */
199 DBG((senv->dbg, LEVEL_1, "Insert spills and reloads:\n"));
200 for(si = set_first(senv->spills); si; si = set_next(senv->spills)) {
204 ir_mode *mode = get_irn_mode(si->spilled_node);
206 /* go through all reloads for this spill */
207 for(rld = si->reloaders; rld; rld = rld->next) {
208 /* the spill for this reloader */
209 ir_node *spill = be_spill_node(senv, si->spilled_node);
212 ir_node *bl = is_Block(rld->reloader) ? rld->reloader : get_nodes_block(rld->reloader);
213 ir_node *reload = new_Reload(senv->session->main_env->node_factory,
214 senv->cls, irg, bl, mode, spill);
216 DBG((senv->dbg, LEVEL_1, " %+F of %+F before %+F\n", reload, si->spilled_node, rld->reloader));
218 pset_insert_ptr(reload_set, reload);
220 /* remember the reaload */
221 obstack_ptr_grow(&ob, reload);
222 sched_add_before(rld->reloader, reload);
226 assert(n_reloads > 0);
227 reloads = obstack_finish(&ob);
228 be_introduce_copies_ignore(senv->session->dom_front, si->spilled_node,
229 n_reloads, reloads, senv->mem_phis);
230 obstack_free(&ob, reloads);
233 obstack_free(&ob, NULL);
235 for(irn = pset_first(senv->mem_phis); irn; irn = pset_next(senv->mem_phis)) {
237 for(i = 0, n = get_irn_arity(irn); i < n; ++i)
238 set_irn_n(irn, i, new_r_Bad(senv->session->irg));
242 del_pset(senv->mem_phis);
245 void be_add_reload(spill_env_t *senv, ir_node *to_spill, ir_node *before) {
246 spill_info_t templ, *res;
249 // assert(get_irn_opcode(to_spill) != iro_Unknown);
251 templ.spilled_node = to_spill;
252 templ.reloaders = NULL;
253 res = set_insert(senv->spills, &templ, sizeof(templ), HASH_PTR(to_spill));
255 rel = obstack_alloc(&senv->obst, sizeof(rel[0]));
256 rel->reloader = before;
257 rel->next = res->reloaders;
258 res->reloaders = rel;
261 void be_add_reload_on_edge(spill_env_t *senv, ir_node *to_spill, ir_node *bl, int pos) {
262 ir_node *insert_bl = get_irn_arity(bl) == 1 ? sched_first(bl) : get_Block_cfgpred_block(bl, pos);
263 be_add_reload(senv, to_spill, insert_bl);