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/* Communication between the Integrated Register Allocator (IRA) and

   the rest of the compiler.

   Copyright (C) 2006, 2007, 2008, 2009, 2010

   Free Software Foundation, Inc.

   Contributed by Vladimir Makarov <vmakarov@redhat.com>.

This file is part of GCC.

GCC is free software; you can redistribute it and/or modify it under

the terms of the GNU General Public License as published by the Free

Software Foundation; either version 3, or (at your option) any later

version.

GCC is distributed in the hope that it will be useful, but WITHOUT ANY

WARRANTY; without even the implied warranty of MERCHANTABILITY or

FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License

for more details.

You should have received a copy of the GNU General Public License

along with GCC; see the file COPYING3.  If not see

<http://www.gnu.org/licenses/>.  */

/* True if we have allocno conflicts.  It is false for non-optimized

   mode or when the conflict table is too big.  */

extern bool ira_conflicts_p;

struct target_ira {

  /* Number of given class hard registers available for the register

     allocation for given classes.  */

  int x_ira_available_class_regs[N_REG_CLASSES];

  /* Map: hard register number -> allocno class it belongs to.  If the

     corresponding class is NO_REGS, the hard register is not available

     for allocation.  */

  enum reg_class x_ira_hard_regno_allocno_class[FIRST_PSEUDO_REGISTER];

  /* Number of allocno classes.  Allocno classes are register classes

     which can be used for allocations of allocnos.  */

  int x_ira_allocno_classes_num;

  /* The array containing allocno classes.  Only first

     IRA_ALLOCNO_CLASSES_NUM elements are used for this.  */

  enum reg_class x_ira_allocno_classes[N_REG_CLASSES];

  /* Map of all register classes to corresponding allocno classes

     containing the given class.  If given class is not a subset of an

     allocno class, we translate it into the cheapest allocno class.  */

  enum reg_class x_ira_allocno_class_translate[N_REG_CLASSES];

  /* Number of pressure classes.  Pressure classes are register

     classes for which we calculate register pressure.  */

  int x_ira_pressure_classes_num;

  /* The array containing pressure classes.  Only first

     IRA_PRESSURE_CLASSES_NUM elements are used for this.  */

  enum reg_class x_ira_pressure_classes[N_REG_CLASSES];

  /* Map of all register classes to corresponding pressure classes

     containing the given class.  If given class is not a subset of an

     pressure class, we translate it into the cheapest pressure

     class.  */

  enum reg_class x_ira_pressure_class_translate[N_REG_CLASSES];

  /* Bigest pressure register class containing stack registers.

     NO_REGS if there are no stack registers.  */

  enum reg_class x_ira_stack_reg_pressure_class;

  /* Maps: register class x machine mode -> maximal/minimal number of

     hard registers of given class needed to store value of given

     mode.  */

  unsigned char x_ira_reg_class_max_nregs[N_REG_CLASSES][MAX_MACHINE_MODE];

  unsigned char x_ira_reg_class_min_nregs[N_REG_CLASSES][MAX_MACHINE_MODE];

  /* Array analogous to target hook TARGET_MEMORY_MOVE_COST.  */

  short x_ira_memory_move_cost[MAX_MACHINE_MODE][N_REG_CLASSES][2];

  /* Array of number of hard registers of given class which are

     available for the allocation.  The order is defined by the

     allocation order.  */

  short x_ira_class_hard_regs[N_REG_CLASSES][FIRST_PSEUDO_REGISTER];

  /* The number of elements of the above array for given register

     class.  */

  int x_ira_class_hard_regs_num[N_REG_CLASSES];

  /* Function specific hard registers can not be used for the register

     allocation.  */

  HARD_REG_SET x_ira_no_alloc_regs;

};

extern struct target_ira default_target_ira;

#if SWITCHABLE_TARGET

extern struct target_ira *this_target_ira;

#else

#define this_target_ira (&default_target_ira)

#endif

#define ira_available_class_regs \

  (this_target_ira->x_ira_available_class_regs)

#define ira_hard_regno_allocno_class \

  (this_target_ira->x_ira_hard_regno_allocno_class)

#define ira_allocno_classes_num \

  (this_target_ira->x_ira_allocno_classes_num)

#define ira_allocno_classes \

  (this_target_ira->x_ira_allocno_classes)

#define ira_allocno_class_translate \

  (this_target_ira->x_ira_allocno_class_translate)

#define ira_pressure_classes_num \

  (this_target_ira->x_ira_pressure_classes_num)

#define ira_pressure_classes \

  (this_target_ira->x_ira_pressure_classes)

#define ira_pressure_class_translate \

  (this_target_ira->x_ira_pressure_class_translate)

#define ira_stack_reg_pressure_class \

  (this_target_ira->x_ira_stack_reg_pressure_class)

#define ira_reg_class_max_nregs \

  (this_target_ira->x_ira_reg_class_max_nregs)

#define ira_reg_class_min_nregs \

  (this_target_ira->x_ira_reg_class_min_nregs)

#define ira_memory_move_cost \

  (this_target_ira->x_ira_memory_move_cost)

#define ira_class_hard_regs \

  (this_target_ira->x_ira_class_hard_regs)

#define ira_class_hard_regs_num \

  (this_target_ira->x_ira_class_hard_regs_num)

#define ira_no_alloc_regs \

  (this_target_ira->x_ira_no_alloc_regs)

extern void ira_init_once (void);

extern void ira_init (void);

extern void ira_finish_once (void);

extern void ira_setup_eliminable_regset (void);

extern rtx ira_eliminate_regs (rtx, enum machine_mode);

extern void ira_set_pseudo_classes (FILE *);

extern void ira_implicitly_set_insn_hard_regs (HARD_REG_SET *);

extern void ira_sort_regnos_for_alter_reg (int *, int, unsigned int *);

extern void ira_mark_allocation_change (int);

extern void ira_mark_memory_move_deletion (int, int);

extern bool ira_reassign_pseudos (int *, int, HARD_REG_SET, HARD_REG_SET *,

                                  HARD_REG_SET *, bitmap);

extern rtx ira_reuse_stack_slot (int, unsigned int, unsigned int);

extern void ira_mark_new_stack_slot (rtx, int, unsigned int);

extern bool ira_better_spill_reload_regno_p (int *, int *, rtx, rtx, rtx);

extern bool ira_bad_reload_regno (int, rtx, rtx);

extern void ira_adjust_equiv_reg_cost (unsigned, int);