gcc/ira.h

   1 /* Communication between the Integrated Register Allocator (IRA) and
   2    the rest of the compiler.
   3    Copyright (C) 2006, 2007, 2008, 2009
   4    Free Software Foundation, Inc.
   5    Contributed by Vladimir Makarov <vmakarov@redhat.com>.
   6
   7 This file is part of GCC.
   8
   9 GCC is free software; you can redistribute it and/or modify it under
  10 the terms of the GNU General Public License as published by the Free
  11 Software Foundation; either version 3, or (at your option) any later
  12 version.
  13
  14 GCC is distributed in the hope that it will be useful, but WITHOUT ANY
  15 WARRANTY; without even the implied warranty of MERCHANTABILITY or
  16 FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  17 for more details.
  18
  19 You should have received a copy of the GNU General Public License
  20 along with GCC; see the file COPYING3.  If not see
  21 <http://www.gnu.org/licenses/>.  */
  22
  23 /* Number of given class hard registers available for the register
  24    allocation for given classes.  */
  25 extern int ira_available_class_regs[N_REG_CLASSES];
  26
  27 /* Map: hard register number -> cover class it belongs to.  If the
  28    corresponding class is NO_REGS, the hard register is not available
  29    for allocation.  */
  30 extern enum reg_class ira_hard_regno_cover_class[FIRST_PSEUDO_REGISTER];
  31
  32 /* Number of cover classes.  Cover classes is non-intersected register
  33    classes containing all hard-registers available for the
  34    allocation.  */
  35 extern int ira_reg_class_cover_size;
  36
  37 /* The array containing cover classes (see also comments for macro
  38    IRA_COVER_CLASSES).  Only first IRA_REG_CLASS_COVER_SIZE elements are
  39    used for this.  */
  40 extern enum reg_class ira_reg_class_cover[N_REG_CLASSES];
  41
  42 /* Map of all register classes to corresponding cover class containing
  43    the given class.  If given class is not a subset of a cover class,
  44    we translate it into the cheapest cover class.  */
  45 extern enum reg_class ira_class_translate[N_REG_CLASSES];
  46
  47 /* Map: register class x machine mode -> number of hard registers of
  48    given class needed to store value of given mode.  If the number for
  49    some hard-registers of the register class is different, the size
  50    will be negative.  */
  51 extern int ira_reg_class_nregs[N_REG_CLASSES][MAX_MACHINE_MODE];
  52
  53 /* Function specific hard registers can not be used for the register
  54    allocation.  */
  55 extern HARD_REG_SET ira_no_alloc_regs;
  56
  57 /* True if we have allocno conflicts.  It is false for non-optimized
  58    mode or when the conflict table is too big.  */
  59 extern bool ira_conflicts_p;
  60
  61 /* Array analogous to macro MEMORY_MOVE_COST.  */
  62 extern short ira_memory_move_cost[MAX_MACHINE_MODE][N_REG_CLASSES][2];
  63
  64 /* Array of number of hard registers of given class which are
  65    available for the allocation.  The order is defined by the
  66    allocation order.  */
  67 extern short ira_class_hard_regs[N_REG_CLASSES][FIRST_PSEUDO_REGISTER];
  68
  69 /* The number of elements of the above array for given register
  70    class.  */
  71 extern int ira_class_hard_regs_num[N_REG_CLASSES];
  72
  73 extern void ira_init_once (void);
  74 extern void ira_init (void);
  75 extern void ira_finish_once (void);
  76 extern void ira_setup_eliminable_regset (void);
  77 extern rtx ira_eliminate_regs (rtx, enum machine_mode);
  78 extern void ira_set_pseudo_classes (FILE *);
  79 extern void ira_implicitly_set_insn_hard_regs (HARD_REG_SET *);
  80
  81 extern void ira_sort_regnos_for_alter_reg (int *, int, unsigned int *);
  82 extern void ira_mark_allocation_change (int);
  83 extern void ira_mark_memory_move_deletion (int, int);
  84 extern bool ira_reassign_pseudos (int *, int, HARD_REG_SET, HARD_REG_SET *,
  85                                   HARD_REG_SET *, bitmap);
  86 extern rtx ira_reuse_stack_slot (int, unsigned int, unsigned int);
  87 extern void ira_mark_new_stack_slot (rtx, int, unsigned int);
  88 extern bool ira_better_spill_reload_regno_p (int *, int *, rtx, rtx, rtx);
  89