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;
48 else if(arch_irn_consider_in_reg_alloc(arch_env, env->cls, irn)) {
49 arch_get_register_req(arch_env, &o.req, irn, -1);
54 o.has_constraints = arch_register_req_is(&o.req, limited);
55 obstack_grow(obst, &o, sizeof(o));
57 insn->out_constraints |= o.has_constraints;
58 pre_colored += arch_get_irn_register(arch_env, irn) != NULL;
61 insn->pre_colored = pre_colored == insn->n_ops && insn->n_ops > 0;
62 insn->use_start = insn->n_ops;
64 for(i = 0, n = get_irn_arity(irn); i < n; ++i) {
65 ir_node *op = get_irn_n(irn, i);
67 if(arch_irn_consider_in_reg_alloc(arch_env, env->cls, op)) {
68 arch_get_register_req(arch_env, &o.req, irn, i);
73 o.has_constraints = arch_register_req_is(&o.req, limited);
74 obstack_grow(obst, &o, sizeof(o));
76 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 assert(op->req.cls == env->cls);
88 op->regs = bitset_obstack_alloc(obst, env->cls->n_regs);
90 if(arch_register_req_is(&op->req, limited))
91 op->req.limited(op->req.limited_env, op->regs);
93 arch_put_non_ignore_regs(arch_env, env->cls, op->regs);
94 if(env->ignore_colors)
95 bitset_andnot(op->regs, env->ignore_colors);
103 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)
105 ie->aenv = birg->main_env->arch_env;
108 ie->ignore_colors = bitset_obstack_alloc(obst, cls->n_regs);
109 be_abi_put_ignore_regs(birg->abi, cls, ie->ignore_colors);