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"
#define REG_BYTES(R) mode_size[(int) GET_MODE (R)]
-/* Get the number of consecutive hard regs required to hold the REG rtx R.
+/* Get the number of consecutive hard regs required to hold the REG or
+ SUBREG 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. */
+ valid way to get this value. You cannot get it from the regno.
+ A target may override this definition, the case where you would do
+ this is where there are registers which are smaller than WORD_SIZE
+ such as the SFmode registers on sparc64. */
+
+#ifndef REG_SIZE
#define REG_SIZE(R) \
((mode_size[(int) GET_MODE (R)] + UNITS_PER_WORD - 1) / UNITS_PER_WORD)
+#endif
+
+/* 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. Like REG_SIZE, 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
/* 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 */
extern varray_type reg_n_info;
-/* 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. */
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