9 be_insn_t *be_scan_insn(const be_insn_env_t *env, ir_node *irn)
11 const arch_env_t *arch_env = env->aenv;
12 struct obstack *obst = env->obst;
18 insn = obstack_alloc(obst, sizeof(insn[0]));
19 memset(insn, 0, sizeof(insn[0]));
22 insn->next_insn = sched_next(irn);
23 if(get_irn_mode(irn) == mode_T) {
26 for(p = sched_next(irn); is_Proj(p); p = sched_next(p)) {
27 if(arch_irn_consider_in_reg_alloc(arch_env, env->cls, p)) {
28 arch_get_register_req(arch_env, &o.req, p, -1);
31 o.pos = -(get_Proj_proj(p) + 1);
33 o.has_constraints = arch_register_req_is(&o.req, limited);
34 obstack_grow(obst, &o, sizeof(o));
36 insn->out_constraints |= o.has_constraints;
37 pre_colored += arch_get_irn_register(arch_env, p) != NULL;
44 else if(arch_irn_consider_in_reg_alloc(arch_env, env->cls, irn)) {
45 arch_get_register_req(arch_env, &o.req, irn, -1);
50 o.has_constraints = arch_register_req_is(&o.req, limited);
51 obstack_grow(obst, &o, sizeof(o));
53 insn->out_constraints |= o.has_constraints;
54 pre_colored += arch_get_irn_register(arch_env, irn) != NULL;
57 insn->pre_colored = pre_colored == insn->n_ops && insn->n_ops > 0;
58 insn->use_start = insn->n_ops;
60 for(i = 0, n = get_irn_arity(irn); i < n; ++i) {
61 ir_node *op = get_irn_n(irn, i);
63 if(arch_irn_consider_in_reg_alloc(arch_env, env->cls, op)) {
64 arch_get_register_req(arch_env, &o.req, irn, i);
69 o.has_constraints = arch_register_req_is(&o.req, limited);
70 obstack_grow(obst, &o, sizeof(o));
72 insn->in_constraints |= o.has_constraints;
76 insn->has_constraints = insn->in_constraints | insn->out_constraints;
77 insn->ops = obstack_finish(obst);
79 /* Compute the admissible registers bitsets. */
80 for(i = 0; i < insn->n_ops; ++i) {
81 be_operand_t *op = &insn->ops[i];
83 assert(op->req.cls == env->cls);
84 op->regs = bitset_obstack_alloc(obst, env->cls->n_regs);
86 if(arch_register_req_is(&op->req, limited))
87 op->req.limited(op->req.limited_env, op->regs);
89 arch_put_non_ignore_regs(arch_env, env->cls, op->regs);
90 bitset_andnot(op->regs, env->ignore_colors);