--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/gcc/regs.h	Fri Jul 17 14:47:48 2009 +0900
@@ -0,0 +1,370 @@
+/* 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, 2008 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 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/>.  */
+
+#ifndef GCC_REGS_H
+#define GCC_REGS_H
+
+#include "varray.h"
+#include "obstack.h"
+#include "hard-reg-set.h"
+#include "basic-block.h"
+
+#define REG_BYTES(R) mode_size[(int) GET_MODE (R)]
+
+/* When you only have the mode of a pseudo register before it has a hard
+   register chosen for it, this reports the size of each hard register
+   a pseudo in such a mode would get allocated to.  A target may
+   override this.  */
+
+#ifndef REGMODE_NATURAL_SIZE
+#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;
+
+/* REG_N_REFS and REG_N_SETS are initialized by a call to
+   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
+   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.  
+
+   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.
+   Furthermore, local_alloc calls regclass to hack both REG_N_REFS and
+   REG_N_SETS for three address insns.  Other passes seem to have
+   other special values.  */
+
+
+
+/* Structure to hold values for REG_N_SETS (i) and REG_N_REFS (i). */
+
+struct regstat_n_sets_and_refs_t
+{
+  int sets;			/* # of times (REG n) is set */
+  int refs;			/* # of times (REG n) is used or set */
+};
+
+extern struct regstat_n_sets_and_refs_t *regstat_n_sets_and_refs;
+
+/* Indexed by n, gives number of times (REG n) is used or set.  */
+static inline int
+REG_N_REFS(int regno)
+{
+  return regstat_n_sets_and_refs[regno].refs;
+}
+
+/* Indexed by n, gives number of times (REG n) is used or set.  */
+#define SET_REG_N_REFS(N,V) (regstat_n_sets_and_refs[N].refs = V)
+#define INC_REG_N_REFS(N,V) (regstat_n_sets_and_refs[N].refs += V)
+
+/* Indexed by n, gives number of times (REG n) is set.  */
+static inline int
+REG_N_SETS (int regno)
+{
+  return regstat_n_sets_and_refs[regno].sets;
+}
+
+/* Indexed by n, gives number of times (REG n) is set.  */
+#define SET_REG_N_SETS(N,V) (regstat_n_sets_and_refs[N].sets = V)
+#define INC_REG_N_SETS(N,V) (regstat_n_sets_and_refs[N].sets += V)
+
+
+/* Functions defined in reg-stat.c.  */
+extern void regstat_init_n_sets_and_refs (void);
+extern void regstat_free_n_sets_and_refs (void);
+extern void regstat_compute_ri (void);
+extern void regstat_free_ri (void);
+extern bitmap regstat_get_setjmp_crosses (void);
+extern void regstat_compute_calls_crossed (void);
+extern void regstat_free_calls_crossed (void);
+
+
+/* Register information indexed by register number.  This structure is
+   initialized by calling regstat_compute_ri and is destroyed by
+   calling regstat_free_ri.  */
+struct reg_info_t
+{
+  int freq;			/* # estimated frequency (REG n) is used or set */
+  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 */
+};
+
+extern struct reg_info_t *reg_info_p;
+
+/* The number allocated elements of reg_info_p.  */
+extern size_t reg_info_p_size;
+
+/* Estimate frequency of references to register N.  */
+
+#define REG_FREQ(N) (reg_info_p[N].freq)
+
+/* 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.  */
+#define REG_FREQ_MAX 1000
+
+/* Compute register frequency from the BB frequency.  When optimizing for size,
+   or profile driven feedback is available and the function is never executed,
+   frequency is always equivalent.  Otherwise rescale the basic block
+   frequency.  */
+#define REG_FREQ_FROM_BB(bb) (optimize_size				      \
+			      || (flag_branch_probabilities		      \
+				  && !ENTRY_BLOCK_PTR->count)		      \
+			      ? REG_FREQ_MAX				      \
+			      : ((bb)->frequency * REG_FREQ_MAX / BB_FREQ_MAX)\
+			      ? ((bb)->frequency * REG_FREQ_MAX / BB_FREQ_MAX)\
+			      : 1)
+
+/* Indexed by N, gives number of insns in which register N dies.
+   Note that if register N is live around loops, it can die
+   in transitions between basic blocks, and that is not counted here.
+   So this is only a reliable indicator of how many regions of life there are
+   for registers that are contained in one basic block.  */
+
+#define REG_N_DEATHS(N) (reg_info_p[N].deaths)
+
+/* Get the number of consecutive words required to hold pseudo-reg N.  */
+
+#define PSEUDO_REGNO_SIZE(N) \
+  ((GET_MODE_SIZE (PSEUDO_REGNO_MODE (N)) + UNITS_PER_WORD - 1)		\
+   / UNITS_PER_WORD)
+
+/* Get the number of bytes required to hold pseudo-reg N.  */
+
+#define PSEUDO_REGNO_BYTES(N) \
+  GET_MODE_SIZE (PSEUDO_REGNO_MODE (N))
+
+/* Get the machine mode of pseudo-reg N.  */
+
+#define PSEUDO_REGNO_MODE(N) GET_MODE (regno_reg_rtx[N])
+
+/* 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.  */
+
+#define REG_N_THROWING_CALLS_CROSSED(N) (reg_info_p[N].throw_calls_crossed)
+
+/* Total number of instructions at which (REG n) is live.  The larger
+   this is, the less priority (REG n) gets for allocation in a hard
+   register (in global-alloc).  This is set in df-problems.c whenever
+   register info is requested and remains valid for the rest of the
+   compilation of the function; it is used to control register
+   allocation.
+
+   local-alloc.c may alter this number to change the priority.
+
+   Negative values are special.
+   -1 is used to mark a pseudo reg which has a constant or memory equivalent
+   and is used infrequently enough that it should not get a hard register.
+   -2 is used to mark a pseudo reg for a parameter, when a frame pointer
+   is not required.  global.c makes an allocno for this but does
+   not try to assign a hard register to it.  */
+
+#define REG_LIVE_LENGTH(N)  (reg_info_p[N].live_length)
+
+/* Indexed by n, gives number of basic block that  (REG n) is used in.
+   If the value is REG_BLOCK_GLOBAL (-1),
+   it means (REG n) is used in more than one basic block.
+   REG_BLOCK_UNKNOWN (0) means it hasn't been seen yet so we don't know.
+   This information remains valid for the rest of the compilation
+   of the current function; it is used to control register allocation.  */
+
+#define REG_BLOCK_UNKNOWN 0
+#define REG_BLOCK_GLOBAL -1
+
+#define REG_BASIC_BLOCK(N) (reg_info_p[N].basic_block)
+
+/* Vector of substitutions of register numbers,
+   used to map pseudo regs into hardware regs.
+
+   This can't be folded into reg_n_info without changing all of the
+   machine dependent directories, since the reload functions
+   in the machine dependent files access it.  */
+
+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.  */
+
+extern int caller_save_needed;
+
+/* Predicate to decide whether to give a hard reg to a pseudo which
+   is referenced REFS times and would need to be saved and restored
+   around a call CALLS times.  */
+
+#ifndef CALLER_SAVE_PROFITABLE
+#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) \
+  choose_hard_reg_mode (REGNO, NREGS, false)
+#endif
+
+/* Registers that get partially clobbered by a call in a given mode.
+   These must not be call used registers.  */
+#ifndef HARD_REGNO_CALL_PART_CLOBBERED
+#define HARD_REGNO_CALL_PART_CLOBBERED(REGNO, MODE) 0
+#endif
+
+/* 1 if the corresponding class does contain register of given
+   mode.  */
+extern char contains_reg_of_mode [N_REG_CLASSES] [MAX_MACHINE_MODE];
+
+typedef unsigned short move_table[N_REG_CLASSES];
+
+/* Maximum cost of moving from a register in one class to a register
+   in another class.  */
+extern move_table *move_cost[MAX_MACHINE_MODE];
+
+/* Specify number of hard registers given machine mode occupy.  */
+extern unsigned char hard_regno_nregs[FIRST_PSEUDO_REGISTER][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.  */
+extern move_table *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.  */
+extern move_table *may_move_out_cost[MAX_MACHINE_MODE];
+
+/* Return an exclusive upper bound on the registers occupied by hard
+   register (reg:MODE REGNO).  */
+
+static inline unsigned int
+end_hard_regno (enum machine_mode mode, unsigned int regno)
+{
+  return regno + hard_regno_nregs[regno][(int) mode];
+}
+
+/* Likewise for hard register X.  */
+
+#define END_HARD_REGNO(X) end_hard_regno (GET_MODE (X), REGNO (X))
+
+/* Likewise for hard or pseudo register X.  */
+
+#define END_REGNO(X) (HARD_REGISTER_P (X) ? END_HARD_REGNO (X) : REGNO (X) + 1)
+
+/* Add to REGS all the registers required to store a value of mode MODE
+   in register REGNO.  */
+
+static inline void
+add_to_hard_reg_set (HARD_REG_SET *regs, enum machine_mode mode,
+		     unsigned int regno)
+{
+  unsigned int end_regno;
+
+  end_regno = end_hard_regno (mode, regno);
+  do
+    SET_HARD_REG_BIT (*regs, regno);
+  while (++regno < end_regno);
+}
+
+/* Likewise, but remove the registers.  */
+
+static inline void
+remove_from_hard_reg_set (HARD_REG_SET *regs, enum machine_mode mode,
+			  unsigned int regno)
+{
+  unsigned int end_regno;
+
+  end_regno = end_hard_regno (mode, regno);
+  do
+    CLEAR_HARD_REG_BIT (*regs, regno);
+  while (++regno < end_regno);
+}
+
+/* Return true if REGS contains the whole of (reg:MODE REGNO).  */
+
+static inline bool
+in_hard_reg_set_p (const HARD_REG_SET regs, enum machine_mode mode,
+		   unsigned int regno)
+{
+  unsigned int end_regno;
+
+  if (!TEST_HARD_REG_BIT (regs, regno))
+    return false;
+
+  end_regno = end_hard_regno (mode, regno);
+  while (++regno < end_regno)
+    if (!TEST_HARD_REG_BIT (regs, regno))
+      return false;
+
+  return true;
+}
+
+/* Return true if (reg:MODE REGNO) includes an element of REGS.  */
+
+static inline bool
+overlaps_hard_reg_set_p (const HARD_REG_SET regs, enum machine_mode mode,
+			 unsigned int regno)
+{
+  unsigned int end_regno;
+
+  if (TEST_HARD_REG_BIT (regs, regno))
+    return true;
+
+  end_regno = end_hard_regno (mode, regno);
+  while (++regno < end_regno)
+    if (TEST_HARD_REG_BIT (regs, regno))
+      return true;
+
+  return false;
+}
+
+#endif /* GCC_REGS_H */