From d4691e641ba47cb86eef80f5c879e13f9d961724 Mon Sep 17 00:00:00 2001 From: peter Date: Wed, 18 Sep 1996 05:35:50 +0000 Subject: Import of unmodified (but trimmed) gcc-2.7.2. The bigger parts of the non-i386, non-unix, and generatable files have been trimmed, but can easily be added in later if needed. gcc-2.7.2.1 will follow shortly, it's a very small delta to this and it's handy to have both available for reference for such little cost. The freebsd-specific changes will then be committed, and once the dust has settled, the bmakefiles will be committed to use this code. --- contrib/gcc/regs.h | 175 +++++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 175 insertions(+) create mode 100644 contrib/gcc/regs.h (limited to 'contrib/gcc/regs.h') diff --git a/contrib/gcc/regs.h b/contrib/gcc/regs.h new file mode 100644 index 0000000..daa012e --- /dev/null +++ b/contrib/gcc/regs.h @@ -0,0 +1,175 @@ +/* Define per-register tables for data flow info and register allocation. + Copyright (C) 1987, 1993, 1994 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. */ + + + +#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) + +/* 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; + +/* 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; + +/* Indexed by n, gives number of times (REG n) is set. */ + +extern short *reg_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. */ + +extern short *reg_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; + +/* 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. */ + +extern int *reg_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. */ + +extern int *reg_live_length; + +/* Vector of substitutions of register numbers, + used to map pseudo regs into hardware regs. */ + +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. */ + +extern int *regno_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. */ + +extern int *regno_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] + +/* 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 + +/* Allocated in local_alloc. */ + +/* 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; -- cgit v1.1