/* Define per-register tables for data flow info and register allocation.
- Copyright (C) 1987, 1993, 1994, 1995, 1997 Free Software Foundation, Inc.
+ Copyright (C) 1987, 93-99, 2000 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;
-/* Maximum number of SCRATCH rtx's in each block of this function. */
-
-extern int max_scratch;
-
/* Register information indexed by register number */
-typedef struct reg_info_def {
- /* fields set by reg_scan */
+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 */
+ /* fields set by reg_scan & flow_analysis */
int sets; /* # of times (REG n) is set */
/* fields set by flow_analysis */
char changes_size; /* whether (SUBREG (REG n)) changes size */
} reg_info;
-extern reg_info *reg_n_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. */
-#define REG_N_REFS(N) (reg_n_info[(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.
??? both regscan and flow allocate space for this. We should settle
on just copy. */
-#define REG_N_SETS(N) (reg_n_info[(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. */
-#define REG_N_DEATHS(N) (reg_n_info[(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. */
-#define REG_CHANGES_SIZE(N) (reg_n_info[(N)].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. */
-#define REG_N_CALLS_CROSSED(N) (reg_n_info[(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. */
-#define REG_LIVE_LENGTH(N) (reg_n_info[(N)].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.
/* 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. */
-#define REGNO_FIRST_UID(N) (reg_n_info[(N)].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. */
-#define REGNO_LAST_UID(N) (reg_n_info[(N)].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. */
-#define REGNO_LAST_NOTE_UID(N) (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 reg_rtx_no;
-
-/* 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]
-extern int regno_pointer_flag_length;
+#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 CLASS_LIKELY_SPILLED_P(CLASS) (reg_class_size[(int) (CLASS)] == 1)
#endif
-/* Allocated in local_alloc. */
+/* 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
-/* 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;
+/* 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
/* Allocate reg_n_info tables */
-extern void allocate_reg_info PROTO((int, int, int));
+extern void allocate_reg_info PARAMS ((size_t, int, int));
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