/* Define per-register tables for data flow info and register allocation.
Copyright (C) 1987, 1993, 1994, 1995, 1996, 1997, 1998,
- 1999, 2000, 2003, 2004, 2005, 2006, 2007 Free Software Foundation, Inc.
+ 1999, 2000, 2003, 2004, 2005, 2006, 2007, 2008, 2010 Free Software
+ Foundation, Inc.
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 2, or (at your option) any later
+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
for more details.
You should have received a copy of the GNU General Public License
-along with GCC; see the file COPYING. If not, write to the Free
-Software Foundation, 51 Franklin Street, Fifth Floor, Boston, MA
-02110-1301, USA. */
+along with GCC; see the file COPYING3. If not see
+<http://www.gnu.org/licenses/>. */
#ifndef GCC_REGS_H
#define GCC_REGS_H
-#include "varray.h"
-#include "obstack.h"
+#include "machmode.h"
#include "hard-reg-set.h"
-#include "basic-block.h"
#define REG_BYTES(R) mode_size[(int) GET_MODE (R)]
#define REGMODE_NATURAL_SIZE(MODE) UNITS_PER_WORD
#endif
-#ifndef SMALL_REGISTER_CLASSES
-#define SMALL_REGISTER_CLASSES 0
-#endif
-
/* Maximum register number used in this function, plus one. */
extern int max_regno;
regstat_init_n_sets_and_refs from the current values of
DF_REG_DEF_COUNT and DF_REG_USE_COUNT. REG_N_REFS and REG_N_SETS
should only be used if a pass need to change these values in some
- magical way or or the pass needs to have accurate values for these
+ magical way or the pass needs to have accurate values for these
and is not using incremental df scanning.
At the end of a pass that uses REG_N_REFS and REG_N_SETS, a call
- should be made to regstat_free_n_sets_and_refs.
+ should be made to regstat_free_n_sets_and_refs.
Local alloc seems to play pretty loose with these values.
REG_N_REFS is set to 0 if the register is used in an asm.
int deaths; /* # of times (REG n) dies */
int live_length; /* # of instructions (REG n) is live */
int calls_crossed; /* # of calls (REG n) is live across */
+ int freq_calls_crossed; /* # estimated frequency (REG n) crosses call */
int throw_calls_crossed; /* # of calls that may throw (REG n) is live across */
int basic_block; /* # of basic blocks (REG n) is used in */
};
#define REG_FREQ(N) (reg_info_p[N].freq)
-/* The weights for each insn varries from 0 to REG_FREQ_BASE.
+/* The weights for each insn varies from 0 to REG_FREQ_BASE.
This constant does not need to be high, as in infrequently executed
regions we want to count instructions equivalently to optimize for
size instead of speed. */
/* Indexed by N, gives number of CALL_INSNS across which (REG n) is live. */
#define REG_N_CALLS_CROSSED(N) (reg_info_p[N].calls_crossed)
+#define REG_FREQ_CALLS_CROSSED(N) (reg_info_p[N].freq_calls_crossed)
/* Indexed by N, gives number of CALL_INSNS that may throw, across which
(REG n) is live. */
extern short *reg_renumber;
-/* Vector indexed by machine mode saying whether there are regs of that mode. */
-
-extern bool have_regs_of_mode [MAX_MACHINE_MODE];
-
-/* For each hard register, the widest mode object that it can contain.
- This will be a MODE_INT mode if the register can hold integers. Otherwise
- it will be a MODE_FLOAT or a MODE_CC mode, whichever is valid for the
- register. */
-
-extern enum machine_mode reg_raw_mode[FIRST_PSEUDO_REGISTER];
-
/* Flag set by local-alloc or global-alloc if they decide to allocate
something in a call-clobbered register. */
#define CALLER_SAVE_PROFITABLE(REFS, CALLS) (4 * (CALLS) < (REFS))
#endif
-/* On most machines a register class is likely to be spilled if it
- only has one register. */
-#ifndef CLASS_LIKELY_SPILLED_P
-#define CLASS_LIKELY_SPILLED_P(CLASS) (reg_class_size[(int) (CLASS)] == 1)
-#endif
-
/* Select a register mode required for caller save of hard regno REGNO. */
#ifndef HARD_REGNO_CALLER_SAVE_MODE
#define HARD_REGNO_CALLER_SAVE_MODE(REGNO, NREGS, MODE) \
#define HARD_REGNO_CALL_PART_CLOBBERED(REGNO, MODE) 0
#endif
-/* Specify number of hard registers given machine mode occupy. */
-extern unsigned char hard_regno_nregs[FIRST_PSEUDO_REGISTER][MAX_MACHINE_MODE];
+typedef unsigned short move_table[N_REG_CLASSES];
+
+/* Target-dependent globals. */
+struct target_regs {
+ /* For each starting hard register, the number of consecutive hard
+ registers that a given machine mode occupies. */
+ unsigned char x_hard_regno_nregs[FIRST_PSEUDO_REGISTER][MAX_MACHINE_MODE];
+
+ /* For each hard register, the widest mode object that it can contain.
+ This will be a MODE_INT mode if the register can hold integers. Otherwise
+ it will be a MODE_FLOAT or a MODE_CC mode, whichever is valid for the
+ register. */
+ enum machine_mode x_reg_raw_mode[FIRST_PSEUDO_REGISTER];
+
+ /* Vector indexed by machine mode saying whether there are regs of
+ that mode. */
+ bool x_have_regs_of_mode[MAX_MACHINE_MODE];
+
+ /* 1 if the corresponding class contains a register of the given mode. */
+ char x_contains_reg_of_mode[N_REG_CLASSES][MAX_MACHINE_MODE];
+
+ /* Maximum cost of moving from a register in one class to a register
+ in another class. Based on TARGET_REGISTER_MOVE_COST. */
+ move_table *x_move_cost[MAX_MACHINE_MODE];
+
+ /* Similar, but here we don't have to move if the first index is a
+ subset of the second so in that case the cost is zero. */
+ move_table *x_may_move_in_cost[MAX_MACHINE_MODE];
+
+ /* Similar, but here we don't have to move if the first index is a
+ superset of the second so in that case the cost is zero. */
+ move_table *x_may_move_out_cost[MAX_MACHINE_MODE];
+
+ /* Keep track of the last mode we initialized move costs for. */
+ int x_last_mode_for_init_move_cost;
+
+ /* Record for each mode whether we can move a register directly to or
+ from an object of that mode in memory. If we can't, we won't try
+ to use that mode directly when accessing a field of that mode. */
+ char x_direct_load[NUM_MACHINE_MODES];
+ char x_direct_store[NUM_MACHINE_MODES];
+
+ /* Record for each mode whether we can float-extend from memory. */
+ bool x_float_extend_from_mem[NUM_MACHINE_MODES][NUM_MACHINE_MODES];
+};
+
+extern struct target_regs default_target_regs;
+#if SWITCHABLE_TARGET
+extern struct target_regs *this_target_regs;
+#else
+#define this_target_regs (&default_target_regs)
+#endif
+
+#define hard_regno_nregs \
+ (this_target_regs->x_hard_regno_nregs)
+#define reg_raw_mode \
+ (this_target_regs->x_reg_raw_mode)
+#define have_regs_of_mode \
+ (this_target_regs->x_have_regs_of_mode)
+#define contains_reg_of_mode \
+ (this_target_regs->x_contains_reg_of_mode)
+#define move_cost \
+ (this_target_regs->x_move_cost)
+#define may_move_in_cost \
+ (this_target_regs->x_may_move_in_cost)
+#define may_move_out_cost \
+ (this_target_regs->x_may_move_out_cost)
+#define direct_load \
+ (this_target_regs->x_direct_load)
+#define direct_store \
+ (this_target_regs->x_direct_store)
+#define float_extend_from_mem \
+ (this_target_regs->x_float_extend_from_mem)
/* Return an exclusive upper bound on the registers occupied by hard
register (reg:MODE REGNO). */
return false;
}
+/* Like add_to_hard_reg_set, but use a REGNO/NREGS range instead of
+ REGNO and MODE. */
+
+static inline void
+add_range_to_hard_reg_set (HARD_REG_SET *regs, unsigned int regno,
+ int nregs)
+{
+ while (nregs-- > 0)
+ SET_HARD_REG_BIT (*regs, regno + nregs);
+}
+
+/* Likewise, but remove the registers. */
+
+static inline void
+remove_range_from_hard_reg_set (HARD_REG_SET *regs, unsigned int regno,
+ int nregs)
+{
+ while (nregs-- > 0)
+ CLEAR_HARD_REG_BIT (*regs, regno + nregs);
+}
+
+/* Like overlaps_hard_reg_set_p, but use a REGNO/NREGS range instead of
+ REGNO and MODE. */
+static inline bool
+range_overlaps_hard_reg_set_p (const HARD_REG_SET set, unsigned regno,
+ int nregs)
+{
+ while (nregs-- > 0)
+ if (TEST_HARD_REG_BIT (set, regno + nregs))
+ return true;
+ return false;
+}
+
+/* Like in_hard_reg_set_p, but use a REGNO/NREGS range instead of
+ REGNO and MODE. */
+static inline bool
+range_in_hard_reg_set_p (const HARD_REG_SET set, unsigned regno, int nregs)
+{
+ while (nregs-- > 0)
+ if (!TEST_HARD_REG_BIT (set, regno + nregs))
+ return false;
+ return true;
+}
+
#endif /* GCC_REGS_H */