/* Define per-register tables for data flow info and register allocation.
- Copyright (C) 1987, 93-98, 1999 Free Software Foundation, Inc.
+ Copyright (C) 1987, 1993, 1994, 1995, 1996, 1997, 1998,
+ 1999, 2000 Free Software Foundation, Inc.
-This file is part of GNU CC.
+This file is part of GCC.
-GNU CC 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 version.
+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
+version.
-GNU CC 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.
+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 GNU CC; see the file COPYING. If not, write to
-the Free Software Foundation, 59 Temple Place - Suite 330,
-Boston, MA 02111-1307, USA. */
+along with GCC; see the file COPYING. If not, write to the Free
+Software Foundation, 59 Temple Place - Suite 330, Boston, MA
+02111-1307, USA. */
#include "varray.h"
+#include "hard-reg-set.h"
+#include "basic-block.h"
#define REG_BYTES(R) mode_size[(int) GET_MODE (R)]
-/* Get the number of consecutive hard regs required to hold the REG rtx R.
- When something may be an explicit hard reg, REG_SIZE is the only
- valid way to get this value. You cannot get it from the regno. */
+/* 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. */
-#define REG_SIZE(R) \
- ((mode_size[(int) GET_MODE (R)] + UNITS_PER_WORD - 1) / UNITS_PER_WORD)
+#ifndef REGMODE_NATURAL_SIZE
+#define REGMODE_NATURAL_SIZE(MODE) UNITS_PER_WORD
+#endif
#ifndef SMALL_REGISTER_CLASSES
#define SMALL_REGISTER_CLASSES 0
/* fields set by flow_analysis */
int refs; /* # of times (REG n) is used or set */
+ 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 basic_block; /* # of basic blocks (REG n) is used in */
- char changes_size; /* whether (SUBREG (REG n)) changes size */
+ char changes_mode; /* whether (SUBREG (REG n)) exists and
+ is illegal. */
} reg_info;
extern varray_type reg_n_info;
-extern unsigned int reg_n_max;
+extern regset_head subregs_of_mode [NUM_MACHINE_MODES];
-/* Indexed by n, gives number of times (REG n) is used or set.
- References within loops may be counted more times. */
+/* Indexed by n, gives number of times (REG n) is used or set. */
#define REG_N_REFS(N) (VARRAY_REG (reg_n_info, N)->refs)
+/* Estimate frequency of references to register N. */
+
+#define REG_FREQ(N) (VARRAY_REG (reg_n_info, N)->freq)
+
+/* The weights for each insn varries 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 times (REG n) is set.
??? both regscan and flow allocate space for this. We should settle
on just copy. */
#define REG_N_DEATHS(N) (VARRAY_REG (reg_n_info, N)->deaths)
-/* Indexed by N; says whether a pseudo register N was ever used
- within a SUBREG that changes the size of the reg. Some machines prohibit
- such objects to be in certain (usually floating-point) registers. */
-
-#define REG_CHANGES_SIZE(N) (VARRAY_REG (reg_n_info, N)->changes_size)
-
/* Get the number of consecutive words required to hold pseudo-reg N. */
#define PSEUDO_REGNO_SIZE(N) \
/* Vector indexed by hardware reg giving its name. */
-extern const char *reg_names[FIRST_PSEUDO_REGISTER];
+extern const char * reg_names[FIRST_PSEUDO_REGISTER];
/* 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
/* 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) \
+#define HARD_REGNO_CALLER_SAVE_MODE(REGNO, NREGS, MODE) \
choose_hard_reg_mode (REGNO, NREGS)
#endif
#endif
/* Allocate reg_n_info tables */
-extern void allocate_reg_info PROTO((size_t, int, int));
+extern void allocate_reg_info PARAMS ((size_t, int, int));