/* Define per-register tables for data flow info and register allocation.
- Copyright (C) 1987, 1993, 1994 Free Software Foundation, Inc.
+ Copyright (C) 1987, 93-99, 2000 Free Software Foundation, Inc.
This file is part of GNU CC.
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, 675 Mass Ave, Cambridge, MA 02139, USA. */
+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)]
#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;
-/* Maximum number of SCRATCH rtx's in each block of this function. */
+/* 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 reg_scan & 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 int max_scratch;
+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;
/* Vector indexed by hardware reg giving its name. */
-extern 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
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;
-
-/* Vector indexed by regno; contains 1 for a register is considered a pointer.
- Reloading, etc. will use a pointer register rather than a non-pointer
- as the base register in an address, when there is a choice of two regs. */
-
-extern char *regno_pointer_flag;
-#define REGNO_POINTER_FLAG(REGNO) regno_pointer_flag[REGNO]
+#define REGNO_LAST_NOTE_UID(N) (VARRAY_REG (reg_n_info, N)->last_note_uid)
/* List made of EXPR_LIST rtx's which gives pairs of pseudo registers
that have to go in the same hard reg. */
extern rtx regs_may_share;
-/* Vector mapping pseudo regno into the REG rtx for that register.
- This is computed by reg_scan. */
-
-extern rtx *regno_reg_rtx;
-
/* 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
-/* Allocated in local_alloc. */
+/* 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) \
+ choose_hard_reg_mode (REGNO, NREGS)
+#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
-/* A list of SCRATCH rtl allocated by local-alloc. */
-extern rtx *scratch_list;
-/* The basic block in which each SCRATCH is 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 PARAMS ((size_t, int, int));
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