fe7dee4700
GCC-2.6.1 COMES TO FREEBSD-current ---------------------------------- Everybody needs to 'make world'. Oakland, Nov 2nd 1994. In a surprise move this sunny afternoon, the release- engineer for the slightly delayed FreeBSD-2.0, Poul-Henning Kamp (28), decided to pull in the new version 2.6.1 of the GNU C-compiler. The new version of the compiler was release today at noon, and hardly 9 hours later it was committed into the FreeBSD-current source-repository. "It's is simply because we have had too much trouble with the version 2.6.0 of the compiler" Poul-Henning told the FreeBSD-Gazette, "we took a gamble when we decided to use that as our compiler for the 2.0 release, but it seems to pay of in the end now" he concludes. The move has not been discussed on the "core" list at all, and will come as a surprise for most Poul-Hennings peers. "I have only discussed it with Jordan [J. K. Hubbard, the FreeBSD's resident humourist], and we agreed that we needed to do it, so ... I did it!". After a breath he added with a grin: "My email will probably get an all time 'disk-full' now!". This will bring quite a flag-day to the FreeBSD developers, the patch-file is almost 1.4 Megabyte, and they will have to run "make world" to get entirely -current again. "Too bad, but we just had to do this." Was the only comment from Poul-Henning to these problems. When asked how this move would impact the 2.0 release-date, Poul-Hennings face grew dark, he mumbled some very Danish words while he moved his fingers in strange geometrical patterns. Immediately something ecclipsed the Sun, a minor tremor shook the buildings, and the temperature fell significantly. We decided not to pursure the question. ----------- JOB-SECTION ----------- Are you a dedicated GCC-hacker ? We BADLY need somebody to look at the 'freebsd' OS in gcc, sanitize it and carry the patches back to the GNU people. In particular, we need to get out of the "i386-only" spot we are in now. I have the stuff to take a gnu-dist into bmake-form, and will do that part. Please apply to phk@freebsd.org No Novice Need Apply.
175 lines
6.1 KiB
C
175 lines
6.1 KiB
C
/* Define per-register tables for data flow info and register allocation.
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Copyright (C) 1987, 1993, 1994 Free Software Foundation, Inc.
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This file is part of GNU CC.
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GNU CC is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2, or (at your option)
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any later version.
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GNU CC is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with GNU CC; see the file COPYING. If not, write to
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the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA. */
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#define REG_BYTES(R) mode_size[(int) GET_MODE (R)]
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/* Get the number of consecutive hard regs required to hold the REG rtx R.
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When something may be an explicit hard reg, REG_SIZE is the only
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valid way to get this value. You cannot get it from the regno. */
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#define REG_SIZE(R) \
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((mode_size[(int) GET_MODE (R)] + UNITS_PER_WORD - 1) / UNITS_PER_WORD)
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/* Maximum register number used in this function, plus one. */
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extern int max_regno;
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/* Maximum number of SCRATCH rtx's in each block of this function. */
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extern int max_scratch;
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/* Indexed by n, gives number of times (REG n) is used or set.
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References within loops may be counted more times. */
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extern int *reg_n_refs;
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/* Indexed by n, gives number of times (REG n) is set. */
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extern short *reg_n_sets;
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/* Indexed by N, gives number of insns in which register N dies.
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Note that if register N is live around loops, it can die
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in transitions between basic blocks, and that is not counted here.
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So this is only a reliable indicator of how many regions of life there are
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for registers that are contained in one basic block. */
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extern short *reg_n_deaths;
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/* Indexed by N; says whether a psuedo register N was ever used
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within a SUBREG that changes the size of the reg. Some machines prohibit
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such objects to be in certain (usually floating-point) registers. */
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extern char *reg_changes_size;
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/* Get the number of consecutive words required to hold pseudo-reg N. */
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#define PSEUDO_REGNO_SIZE(N) \
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((GET_MODE_SIZE (PSEUDO_REGNO_MODE (N)) + UNITS_PER_WORD - 1) \
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/ UNITS_PER_WORD)
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/* Get the number of bytes required to hold pseudo-reg N. */
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#define PSEUDO_REGNO_BYTES(N) \
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GET_MODE_SIZE (PSEUDO_REGNO_MODE (N))
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/* Get the machine mode of pseudo-reg N. */
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#define PSEUDO_REGNO_MODE(N) GET_MODE (regno_reg_rtx[N])
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/* Indexed by N, gives number of CALL_INSNS across which (REG n) is live. */
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extern int *reg_n_calls_crossed;
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/* Total number of instructions at which (REG n) is live.
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The larger this is, the less priority (REG n) gets for
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allocation in a hard register (in global-alloc).
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This is set in flow.c and remains valid for the rest of the compilation
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of the function; it is used to control register allocation.
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local-alloc.c may alter this number to change the priority.
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Negative values are special.
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-1 is used to mark a pseudo reg which has a constant or memory equivalent
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and is used infrequently enough that it should not get a hard register.
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-2 is used to mark a pseudo reg for a parameter, when a frame pointer
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is not required. global.c makes an allocno for this but does
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not try to assign a hard register to it. */
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extern int *reg_live_length;
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/* Vector of substitutions of register numbers,
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used to map pseudo regs into hardware regs. */
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extern short *reg_renumber;
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/* Vector indexed by hardware reg
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saying whether that reg is ever used. */
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extern char regs_ever_live[FIRST_PSEUDO_REGISTER];
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/* Vector indexed by hardware reg giving its name. */
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extern char *reg_names[FIRST_PSEUDO_REGISTER];
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/* For each hard register, the widest mode object that it can contain.
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This will be a MODE_INT mode if the register can hold integers. Otherwise
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it will be a MODE_FLOAT or a MODE_CC mode, whichever is valid for the
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register. */
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extern enum machine_mode reg_raw_mode[FIRST_PSEUDO_REGISTER];
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/* Vector indexed by regno; gives uid of first insn using that reg.
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This is computed by reg_scan for use by cse and loop.
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It is sometimes adjusted for subsequent changes during loop,
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but not adjusted by cse even if cse invalidates it. */
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extern int *regno_first_uid;
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/* Vector indexed by regno; gives uid of last insn using that reg.
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This is computed by reg_scan for use by cse and loop.
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It is sometimes adjusted for subsequent changes during loop,
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but not adjusted by cse even if cse invalidates it.
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This is harmless since cse won't scan through a loop end. */
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extern int *regno_last_uid;
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/* Similar, but includes insns that mention the reg in their notes. */
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extern int *regno_last_note_uid;
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/* Vector indexed by regno; contains 1 for a register is considered a pointer.
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Reloading, etc. will use a pointer register rather than a non-pointer
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as the base register in an address, when there is a choice of two regs. */
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extern char *regno_pointer_flag;
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#define REGNO_POINTER_FLAG(REGNO) regno_pointer_flag[REGNO]
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/* List made of EXPR_LIST rtx's which gives pairs of pseudo registers
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that have to go in the same hard reg. */
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extern rtx regs_may_share;
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/* Vector mapping pseudo regno into the REG rtx for that register.
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This is computed by reg_scan. */
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extern rtx *regno_reg_rtx;
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/* Flag set by local-alloc or global-alloc if they decide to allocate
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something in a call-clobbered register. */
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extern int caller_save_needed;
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/* Predicate to decide whether to give a hard reg to a pseudo which
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is referenced REFS times and would need to be saved and restored
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around a call CALLS times. */
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#ifndef CALLER_SAVE_PROFITABLE
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#define CALLER_SAVE_PROFITABLE(REFS, CALLS) (4 * (CALLS) < (REFS))
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#endif
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/* Allocated in local_alloc. */
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/* A list of SCRATCH rtl allocated by local-alloc. */
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extern rtx *scratch_list;
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/* The basic block in which each SCRATCH is used. */
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extern int *scratch_block;
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/* The length of the arrays pointed to by scratch_block and scratch_list. */
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extern int scratch_list_length;
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