13 be_insn_t *be_scan_insn(const be_insn_env_t *env, ir_node *irn)
15 const arch_env_t *arch_env = env->aenv;
16 struct obstack *obst = env->obst;
22 insn = obstack_alloc(obst, sizeof(insn[0]));
23 memset(insn, 0, sizeof(insn[0]));
26 insn->next_insn = sched_next(irn);
27 if(get_irn_mode(irn) == mode_T) {
30 for(p = sched_next(irn); is_Proj(p); p = sched_next(p)) {
31 if(arch_irn_consider_in_reg_alloc(arch_env, env->cls, p)) {
32 arch_get_register_req(arch_env, &o.req, p, -1);
35 o.pos = -(get_Proj_proj(p) + 1);
37 o.has_constraints = arch_register_req_is(&o.req, limited);
38 obstack_grow(obst, &o, sizeof(o));
40 insn->out_constraints |= o.has_constraints;
41 pre_colored += arch_get_irn_register(arch_env, p) != NULL;
47 else if(arch_irn_consider_in_reg_alloc(arch_env, env->cls, irn)) {
48 arch_get_register_req(arch_env, &o.req, irn, -1);
53 o.has_constraints = arch_register_req_is(&o.req, limited);
54 obstack_grow(obst, &o, sizeof(o));
56 insn->out_constraints |= o.has_constraints;
57 pre_colored += arch_get_irn_register(arch_env, irn) != NULL;
60 insn->pre_colored = pre_colored == insn->n_ops && insn->n_ops > 0;
61 insn->use_start = insn->n_ops;
63 for(i = 0, n = get_irn_arity(irn); i < n; ++i) {
64 ir_node *op = get_irn_n(irn, i);
66 if(!arch_irn_consider_in_reg_alloc(arch_env, env->cls, op))
69 arch_get_register_req(arch_env, &o.req, irn, i);
74 o.has_constraints = arch_register_req_is(&o.req, limited);
75 obstack_grow(obst, &o, sizeof(o));
77 insn->in_constraints |= o.has_constraints;
80 insn->has_constraints = insn->in_constraints | insn->out_constraints;
81 insn->ops = obstack_finish(obst);
83 /* Compute the admissible registers bitsets. */
84 for (i = 0; i < insn->n_ops; ++i) {
85 be_operand_t *op = &insn->ops[i];
87 if (op->req.cls == NULL && op->req.type == arch_register_req_type_none) {
88 op->req.cls = env->cls;
89 op->req.type = arch_register_req_type_normal;
92 assert(op->req.cls == env->cls);
93 op->regs = bitset_obstack_alloc(obst, env->cls->n_regs);
95 if (arch_register_req_is(&op->req, limited))
96 op->req.limited(op->req.limited_env, op->regs);
98 arch_put_non_ignore_regs(arch_env, env->cls, op->regs);
99 if (env->ignore_colors)
100 bitset_andnot(op->regs, env->ignore_colors);
107 be_insn_env_t *be_insn_env_init(be_insn_env_t *ie, const be_irg_t *birg, const arch_register_class_t *cls, struct obstack *obst)
109 ie->aenv = birg->main_env->arch_env;
112 ie->ignore_colors = bitset_obstack_alloc(obst, cls->n_regs);
113 be_abi_put_ignore_regs(birg->abi, cls, ie->ignore_colors);