diff options
Diffstat (limited to 'contrib/gcc/regs.h')
| -rw-r--r-- | contrib/gcc/regs.h | 107 |
1 files changed, 57 insertions, 50 deletions
diff --git a/contrib/gcc/regs.h b/contrib/gcc/regs.h index d513093bf0d5..0b35f07dee0a 100644 --- a/contrib/gcc/regs.h +++ b/contrib/gcc/regs.h @@ -1,34 +1,37 @@ /* Define per-register tables for data flow info and register allocation. - Copyright (C) 1987, 1993, 1994, 1995, 1997, 1998 Free Software Foundation, Inc. + 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. - 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. */ +/* 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. A target may + override this. */ -#define REG_SIZE(R) \ - ((mode_size[(int) GET_MODE (R)] + UNITS_PER_WORD - 1) / UNITS_PER_WORD) +#ifndef REGMODE_NATURAL_SIZE +#define REGMODE_NATURAL_SIZE(MODE) UNITS_PER_WORD +#endif #ifndef SMALL_REGISTER_CLASSES #define SMALL_REGISTER_CLASSES 0 @@ -39,33 +42,54 @@ Boston, MA 02111-1307, USA. */ extern int max_regno; /* 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 */ 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 */ int basic_block; /* # of basic blocks (REG n) is used in */ - char changes_size; /* whether (SUBREG (REG n)) changes size */ + char changes_mode; /* whether (SUBREG (REG n)) exists and + is illegal. */ } 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. */ +/* 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. */ @@ -81,10 +105,11 @@ extern unsigned int reg_n_max; #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. */ + within a SUBREG that changes the mode of the reg in some way + that is illegal for a given class (usually floating-point) + of registers. */ -#define REG_CHANGES_SIZE(N) (VARRAY_REG (reg_n_info, N)->changes_size) +#define REG_CHANGES_MODE(N) (VARRAY_REG (reg_n_info, N)->changes_mode) /* Get the number of consecutive words required to hold pseudo-reg N. */ @@ -138,7 +163,7 @@ extern char regs_ever_live[FIRST_PSEUDO_REGISTER]; /* 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 @@ -166,28 +191,10 @@ extern enum machine_mode reg_raw_mode[FIRST_PSEUDO_REGISTER]; #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. */ @@ -209,7 +216,7 @@ extern int caller_save_needed; /* 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) \ +#define HARD_REGNO_CALLER_SAVE_MODE(REGNO, NREGS, MODE) \ choose_hard_reg_mode (REGNO, NREGS) #endif @@ -220,4 +227,4 @@ extern int caller_save_needed; #endif /* Allocate reg_n_info tables */ -extern void allocate_reg_info PROTO((size_t, int, int)); +extern void allocate_reg_info PARAMS ((size_t, int, int)); |