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author | obrien <obrien@FreeBSD.org> | 1999-08-26 09:30:50 +0000 |
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committer | obrien <obrien@FreeBSD.org> | 1999-08-26 09:30:50 +0000 |
commit | 0bedf4fb30066e5e1d4342a1d3914dae7d37cba7 (patch) | |
tree | 68d8110b41afd0ebbf39167b1a4918eea667a7c5 /contrib/gcc/regs.h | |
parent | d4db5fb866b7ad5216abd5047774a3973b9901a9 (diff) | |
download | FreeBSD-src-0bedf4fb30066e5e1d4342a1d3914dae7d37cba7.zip FreeBSD-src-0bedf4fb30066e5e1d4342a1d3914dae7d37cba7.tar.gz |
Virgin import of gcc from EGCS 1.1.2
Diffstat (limited to 'contrib/gcc/regs.h')
-rw-r--r-- | contrib/gcc/regs.h | 73 |
1 files changed, 61 insertions, 12 deletions
diff --git a/contrib/gcc/regs.h b/contrib/gcc/regs.h index daa012e..e248665 100644 --- a/contrib/gcc/regs.h +++ b/contrib/gcc/regs.h @@ -1,5 +1,5 @@ /* Define per-register tables for data flow info and register allocation. - Copyright (C) 1987, 1993, 1994 Free Software Foundation, Inc. + Copyright (C) 1987, 1993, 1994, 1995, 1997, 1998 Free Software Foundation, Inc. This file is part of GNU CC. @@ -19,6 +19,7 @@ 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)] @@ -29,6 +30,10 @@ Boston, MA 02111-1307, USA. */ #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; @@ -37,14 +42,39 @@ 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 @@ -52,13 +82,13 @@ extern short *reg_n_sets; 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. */ @@ -77,7 +107,7 @@ extern char *reg_changes_size; /* 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 @@ -94,10 +124,14 @@ extern int *reg_n_calls_crossed; 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; @@ -122,7 +156,7 @@ extern enum machine_mode reg_raw_mode[FIRST_PSEUDO_REGISTER]; 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. @@ -130,11 +164,16 @@ extern int *regno_first_uid; 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 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 @@ -142,6 +181,7 @@ extern int *regno_last_note_uid; 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. */ @@ -165,6 +205,12 @@ extern int caller_save_needed; #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 + /* Allocated in local_alloc. */ /* A list of SCRATCH rtl allocated by local-alloc. */ @@ -173,3 +219,6 @@ extern rtx *scratch_list; 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)); |