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 /* Function specific hard registers can not be used for the register
  24    allocation.  */
  25 extern HARD_REG_SET ira_no_alloc_regs;
  26
  27 /* True if we have allocno conflicts.  It is false for non-optimized
  28    mode or when the conflict table is too big.  */
  29 extern bool ira_conflicts_p;
  30
  31 struct target_ira {
  32   /* Number of given class hard registers available for the register
  33      allocation for given classes.  */
  34   int x_ira_available_class_regs[N_REG_CLASSES];
  35
  36   /* Map: hard register number -> cover class it belongs to.  If the
  37      corresponding class is NO_REGS, the hard register is not available
  38      for allocation.  */
  39   enum reg_class x_ira_hard_regno_cover_class[FIRST_PSEUDO_REGISTER];
  40
  41   /* Number of cover classes.  Cover classes is non-intersected register
  42      classes containing all hard-registers available for the
  43      allocation.  */
  44   int x_ira_reg_class_cover_size;
  45
  46   /* The array containing cover classes (see also comments for macro
  47      IRA_COVER_CLASSES;.  Only first IRA_REG_CLASS_COVER_SIZE elements are
  48      used for this.  */
  49   enum reg_class x_ira_reg_class_cover[N_REG_CLASSES];
  50
  51   /* Map of all register classes to corresponding cover class containing
  52      the given class.  If given class is not a subset of a cover class,
  53      we translate it into the cheapest cover class.  */
  54   enum reg_class x_ira_class_translate[N_REG_CLASSES];
  55
  56   /* Map: register class x machine mode -> number of hard registers of
  57      given class needed to store value of given mode.  If the number for
  58      some hard-registers of the register class is different, the size
  59      will be negative.  */
  60   int x_ira_reg_class_nregs[N_REG_CLASSES][MAX_MACHINE_MODE];
  61
  62   /* Array analogous to target hook TARGET_MEMORY_MOVE_COST.  */
  63   short x_ira_memory_move_cost[MAX_MACHINE_MODE][N_REG_CLASSES][2];
  64
  65   /* Array of number of hard registers of given class which are
  66      available for the allocation.  The order is defined by the
  67      allocation order.  */
  68   short x_ira_class_hard_regs[N_REG_CLASSES][FIRST_PSEUDO_REGISTER];
  69
  70   /* The number of elements of the above array for given register
  71      class.  */
  72   int x_ira_class_hard_regs_num[N_REG_CLASSES];
  73 };
  74
  75 extern struct target_ira default_target_ira;
  76 #if SWITCHABLE_TARGET
  77 extern struct target_ira *this_target_ira;
  78 #else
  79 #define this_target_ira (&default_target_ira)
  80 #endif
  81
  82 #define ira_available_class_regs \
  83   (this_target_ira->x_ira_available_class_regs)
  84 #define ira_hard_regno_cover_class \
  85   (this_target_ira->x_ira_hard_regno_cover_class)
  86 #define ira_reg_class_cover_size \
  87   (this_target_ira->x_ira_reg_class_cover_size)
  88 #define ira_reg_class_cover \
  89   (this_target_ira->x_ira_reg_class_cover)
  90 #define ira_class_translate \
  91   (this_target_ira->x_ira_class_translate)
  92 #define ira_reg_class_nregs \
  93   (this_target_ira->x_ira_reg_class_nregs)
  94 #define ira_memory_move_cost \
  95   (this_target_ira->x_ira_memory_move_cost)
  96 #define ira_class_hard_regs \
  97   (this_target_ira->x_ira_class_hard_regs)
  98 #define ira_class_hard_regs_num \
  99   (this_target_ira->x_ira_class_hard_regs_num)
 100
 101 extern void ira_init_once (void);
 102 extern void ira_init (void);
 103 extern void ira_finish_once (void);
 104 extern void ira_setup_eliminable_regset (void);
 105 extern rtx ira_eliminate_regs (rtx, enum machine_mode);
 106 extern void ira_set_pseudo_classes (FILE *);
 107 extern void ira_implicitly_set_insn_hard_regs (HARD_REG_SET *);
 108
 109 extern void ira_sort_regnos_for_alter_reg (int *, int, unsigned int *);
 110 extern void ira_mark_allocation_change (int);
 111 extern void ira_mark_memory_move_deletion (int, int);
 112 extern bool ira_reassign_pseudos (int *, int, HARD_REG_SET, HARD_REG_SET *,
 113                                   HARD_REG_SET *, bitmap);
 114 extern rtx ira_reuse_stack_slot (int, unsigned int, unsigned int);
 115 extern void ira_mark_new_stack_slot (rtx, int, unsigned int);
 116 extern bool ira_better_spill_reload_regno_p (int *, int *, rtx, rtx, rtx);
 117 extern bool ira_bad_reload_regno (int, rtx, rtx);
 118
 119 extern void ira_adjust_equiv_reg_cost (unsigned, int);