nsz Git - libfirm/blob - ir/be/beinsn.c

   1 /*
   2  * Copyright (C) 1995-2008 University of Karlsruhe.  All right reserved.
   3  *
   4  * This file is part of libFirm.
   5  *
   6  * This file may be distributed and/or modified under the terms of the
   7  * GNU General Public License version 2 as published by the Free Software
   8  * Foundation and appearing in the file LICENSE.GPL included in the
   9  * packaging of this file.
  10  *
  11  * Licensees holding valid libFirm Professional Edition licenses may use
  12  * this file in accordance with the libFirm Commercial License.
  13  * Agreement provided with the Software.
  14  *
  15  * This file is provided AS IS with NO WARRANTY OF ANY KIND, INCLUDING THE
  16  * WARRANTY OF DESIGN, MERCHANTABILITY AND FITNESS FOR A PARTICULAR
  17  * PURPOSE.
  18  */
  19
  20 /**
  21  * @file
  22  * @brief       A data structure to treat nodes and node-proj collections uniformly.
  23  * @author      Sebastian Hack
  24  */
  25 #include "config.h"
  26
  27 #include "irgraph_t.h"
  28 #include "irmode_t.h"
  29 #include "irnode_t.h"
  30 #include "iredges.h"
  31
  32 #include "bechordal_t.h"
  33 #include "besched.h"
  34 #include "beinsn_t.h"
  35 #include "beirg.h"
  36 #include "beabi.h"
  37 #include "raw_bitset.h"
  38
  39 be_insn_t *be_scan_insn(be_chordal_env_t const *const env, ir_node *const irn)
  40 {
  41         struct obstack *obst = env->obst;
  42         be_operand_t o;
  43         int i, n;
  44         int pre_colored = 0;
  45
  46         be_insn_t *insn = OALLOCZ(obst, be_insn_t);
  47
  48         insn->irn       = irn;
  49         insn->next_insn = sched_next(irn);
  50         if (get_irn_mode(irn) == mode_T) {
  51                 ir_node *p;
  52
  53                 /* This instruction might create more than one def. These are handled
  54                    by Proj's, find them. */
  55                 foreach_out_edge(irn, edge) {
  56                         p = get_edge_src_irn(edge);
  57
  58                         /* did not work if the result is a ProjT. This should NOT happen
  59                            in the backend, but check it for now. */
  60                         assert(get_irn_mode(p) != mode_T);
  61
  62                         if (arch_irn_consider_in_reg_alloc(env->cls, p)) {
  63                                 /* found a def: create a new operand */
  64                                 o.req             = arch_get_irn_register_req(p);
  65                                 o.carrier         = p;
  66                                 o.irn             = irn;
  67                                 o.pos             = -(get_Proj_proj(p) + 1);
  68                                 o.partner         = NULL;
  69                                 o.has_constraints = arch_register_req_is(o.req, limited) | (o.req->width > 1);
  70                                 obstack_grow(obst, &o, sizeof(o));
  71                                 insn->n_ops++;
  72                                 insn->out_constraints |= o.has_constraints;
  73                                 pre_colored += arch_get_irn_register(p) != NULL;
  74                         }
  75                 }
  76         } else if (arch_irn_consider_in_reg_alloc(env->cls, irn)) {
  77                 /* only one def, create one operand */
  78                 o.req     = arch_get_irn_register_req(irn);
  79                 o.carrier = irn;
  80                 o.irn     = irn;
  81                 o.pos     = -1;
  82                 o.partner = NULL;
  83                 o.has_constraints = arch_register_req_is(o.req, limited) | (o.req->width > 1);
  84                 obstack_grow(obst, &o, sizeof(o));
  85                 insn->n_ops++;
  86                 insn->out_constraints |= o.has_constraints;
  87                 pre_colored += arch_get_irn_register(irn) != NULL;
  88         }
  89
  90         if (pre_colored > 0) {
  91                 assert(pre_colored == insn->n_ops && "partly pre-colored nodes not supported");
  92                 insn->pre_colored = 1;
  93         }
  94         insn->use_start   = insn->n_ops;
  95
  96         /* now collect the uses for this node */
  97         for (i = 0, n = get_irn_arity(irn); i < n; ++i) {
  98                 ir_node *op = get_irn_n(irn, i);
  99
 100                 if (arch_irn_consider_in_reg_alloc(env->cls, op)) {
 101                         /* found a register use, create an operand */
 102                         o.req     = arch_get_irn_register_req_in(irn, i);
 103                         o.carrier = op;
 104                         o.irn     = irn;
 105                         o.pos     = i;
 106                         o.partner = NULL;
 107                         o.has_constraints = arch_register_req_is(o.req, limited);
 108                         obstack_grow(obst, &o, sizeof(o));
 109                         insn->n_ops++;
 110                         insn->in_constraints |= o.has_constraints;
 111                 }
 112         }
 113
 114         insn->has_constraints = insn->in_constraints | insn->out_constraints;
 115         insn->ops = (be_operand_t*)obstack_finish(obst);
 116
 117         /* Compute the admissible registers bitsets. */
 118         for (i = 0; i < insn->n_ops; ++i) {
 119                 be_operand_t *op = &insn->ops[i];
 120                 const arch_register_req_t   *req = op->req;
 121                 const arch_register_class_t *cls = req->cls;
 122                 arch_register_req_type_t    type = req->type;
 123
 124                 /* If there is no special requirement, we allow current class here */
 125                 if (cls == NULL && req->type == arch_register_req_type_none) {
 126                         cls  = env->cls;
 127                         type = arch_register_req_type_normal;
 128                 }
 129
 130                 assert(cls == env->cls);
 131
 132                 if (type & arch_register_req_type_limited) {
 133                         bitset_t *regs = bitset_obstack_alloc(obst, env->cls->n_regs);
 134                         rbitset_copy_to_bitset(req->limited, regs);
 135                         op->regs = regs;
 136                 } else {
 137                         op->regs = env->allocatable_regs;
 138                 }
 139         }
 140
 141         return insn;
 142 }