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Diffstat (limited to 'gcc_arm/regs.h')
| -rwxr-xr-x | gcc_arm/regs.h | 240 |
1 files changed, 240 insertions, 0 deletions
diff --git a/gcc_arm/regs.h b/gcc_arm/regs.h new file mode 100755 index 0000000..5f5c38b --- /dev/null +++ b/gcc_arm/regs.h @@ -0,0 +1,240 @@ +/* Define per-register tables for data flow info and register allocation. + Copyright (C) 1987, 1993, 1994, 1995, 1997, 1998 Free Software Foundation, Inc. + +This file is part of GNU CC. + +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. + +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. + +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. */ + + +#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. + 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. */ + +#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; + +/* 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 */ + /* CYGNUS LOCAL LRS */ + unsigned range_candidate : 1; /* register is candidate for LRS */ + unsigned range_copy : 1; /* register is a copy generated by LRS */ + unsigned changes_size : 1; /* whether (SUBREG (REG n)) changes size */ + /* END CYGNUS LOCAL */ +} 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. */ + +#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) (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 + in transitions between basic blocks, and that is not counted here. + 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) (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) + +/* CYGNHUS LOCAL LRS */ +/* Indexed by N; says whether a pseudo register is a candidate for + live range splitting. */ + +#define REG_N_RANGE_CANDIDATE_P(N) \ + (VARRAY_REG (reg_n_info, N)->range_candidate) + +/* Indexed by N; says whether a pseudo register is a copy of a register + found during live range splitting. */ + +#define REG_N_RANGE_COPY_P(N) (VARRAY_REG (reg_n_info, N)->range_copy) +/* END CYGNUS LOCAL */ + +/* Get the number of consecutive words required to hold pseudo-reg N. */ + +#define PSEUDO_REGNO_SIZE(N) \ + ((GET_MODE_SIZE (PSEUDO_REGNO_MODE (N)) + UNITS_PER_WORD - 1) \ + / UNITS_PER_WORD) + +/* Get the number of bytes required to hold pseudo-reg N. */ + +#define PSEUDO_REGNO_BYTES(N) \ + GET_MODE_SIZE (PSEUDO_REGNO_MODE (N)) + +/* Get the machine mode of pseudo-reg N. */ + +#define PSEUDO_REGNO_MODE(N) GET_MODE (regno_reg_rtx[N]) + +/* Indexed by N, gives number of CALL_INSNS across which (REG n) is live. */ + +#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 + allocation in a hard register (in global-alloc). + This is set in flow.c and remains valid for the rest of the compilation + of the function; it is used to control register allocation. + + local-alloc.c may alter this number to change the priority. + + Negative values are special. + -1 is used to mark a pseudo reg which has a constant or memory equivalent + and is used infrequently enough that it should not get a hard register. + -2 is used to mark a pseudo reg for a parameter, when a frame pointer + 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) (VARRAY_REG (reg_n_info, N)->live_length) + +/* Vector of substitutions of register numbers, + 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 + saying whether that reg is ever used. */ + +extern char regs_ever_live[FIRST_PSEUDO_REGISTER]; + +/* Vector indexed by hardware reg giving its name. */ + +extern 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 will be a MODE_FLOAT or a MODE_CC mode, whichever is valid for the + register. */ + +extern enum machine_mode reg_raw_mode[FIRST_PSEUDO_REGISTER]; + +/* Vector indexed by regno; gives uid of first insn using that reg. + This is computed by reg_scan for use by cse and loop. + It is sometimes adjusted for subsequent changes during loop, + but not adjusted by cse even if cse invalidates it. */ + +#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. + It is sometimes adjusted for subsequent changes during 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) (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) (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 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; + +/* 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. */ + +extern int caller_save_needed; + +/* Predicate to decide whether to give a hard reg to a pseudo which + is referenced REFS times and would need to be saved and restored + around a call CALLS times. */ + +#ifndef CALLER_SAVE_PROFITABLE +#define CALLER_SAVE_PROFITABLE(REFS, CALLS) (4 * (CALLS) < (REFS)) +#endif + +/* 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 + +/* Allocate reg_n_info tables */ +extern void allocate_reg_info PROTO((size_t, int, int)); |