/* Define per-register tables for data flow info and register allocation.
- Copyright (C) 1987, 1993, 1994, 1995 Free Software Foundation, Inc.
+ Copyright (C) 1987, 1993, 1994, 1995, 1997, 1998 Free Software Foundation, Inc.
This file is part of GNU CC.
Boston, MA 02111-1307, USA. */
+#include "varray.h"
#define REG_BYTES(R) mode_size[(int) GET_MODE (R)]
#define REG_SIZE(R) \
((mode_size[(int) GET_MODE (R)] + UNITS_PER_WORD - 1) / UNITS_PER_WORD)
+#ifndef SMALL_REGISTER_CLASSES
+#define SMALL_REGISTER_CLASSES 0
+#endif
+
/* Maximum register number used in this function, plus one. */
extern int max_regno;
extern int max_scratch;
+/* Register information indexed by register number */
+typedef struct reg_info_def {
+ /* fields set by reg_scan */
+ int first_uid; /* UID of first insn to use (REG n) */
+ int last_uid; /* UID of last insn to use (REG n) */
+ int last_note_uid; /* UID of last note to use (REG n) */
+
+ /* fields set by both reg_scan and flow_analysis */
+ int sets; /* # of times (REG n) is set */
+
+ /* fields set by flow_analysis */
+ int refs; /* # of times (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 */
+} reg_info;
+
+extern varray_type reg_n_info;
+
+extern unsigned int reg_n_max;
+
/* Indexed by n, gives number of times (REG n) is used or set.
References within loops may be counted more times. */
-extern int *reg_n_refs;
+#define REG_N_REFS(N) (VARRAY_REG (reg_n_info, N)->refs)
-/* Indexed by n, gives number of times (REG n) is set. */
+/* 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. */
-extern short *reg_n_sets;
+#define REG_N_SETS(N) (VARRAY_REG (reg_n_info, N)->sets)
/* Indexed by N, gives number of insns in which register N dies.
Note that if register N is live around loops, it can die
So this is only a reliable indicator of how many regions of life there are
for registers that are contained in one basic block. */
-extern short *reg_n_deaths;
+#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. */
-extern char *reg_changes_size;
+#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. */
/* Indexed by N, gives number of CALL_INSNS across which (REG n) is live. */
-extern int *reg_n_calls_crossed;
+#define REG_N_CALLS_CROSSED(N) (VARRAY_REG (reg_n_info, N)->calls_crossed)
/* Total number of instructions at which (REG n) is live.
The larger this is, the less priority (REG n) gets for
is not required. global.c makes an allocno for this but does
not try to assign a hard register to it. */
-extern int *reg_live_length;
+#define REG_LIVE_LENGTH(N) (VARRAY_REG (reg_n_info, N)->live_length)
/* Vector of substitutions of register numbers,
- used to map pseudo regs into hardware regs. */
+ 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;
It is sometimes adjusted for subsequent changes during loop,
but not adjusted by cse even if cse invalidates it. */
-extern int *regno_first_uid;
+#define REGNO_FIRST_UID(N) (VARRAY_REG (reg_n_info, N)->first_uid)
/* Vector indexed by regno; gives uid of last insn using that reg.
This is computed by reg_scan for use by cse and loop.
but not adjusted by cse even if cse invalidates it.
This is harmless since cse won't scan through a loop end. */
-extern int *regno_last_uid;
+#define REGNO_LAST_UID(N) (VARRAY_REG (reg_n_info, N)->last_uid)
/* Similar, but includes insns that mention the reg in their notes. */
-extern int *regno_last_note_uid;
+#define REGNO_LAST_NOTE_UID(N) (VARRAY_REG (reg_n_info, N)->last_note_uid)
/* This is reset to LAST_VIRTUAL_REGISTER + 1 at the start of each function.
After rtl generation, it is 1 plus the largest register number used. */
extern int *scratch_block;
/* The length of the arrays pointed to by scratch_block and scratch_list. */
extern int scratch_list_length;
+
+/* Allocate reg_n_info tables */
+extern void allocate_reg_info PROTO((size_t, int, int));
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