convex.h

早期freebsd实现

/* Definitions of target machine for GNU compiler.  Convex version.
   Copyright (C) 1992 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, 675 Mass Ave, Cambridge, MA 02139, USA.  */


/* Standard GCC variables that we reference. */

extern int target_flags;

/* Interface to convex.c. */

extern int current_section_is_text;
extern int const_double_low_int ();
extern int const_double_high_int ();
extern char *set_cmp (), *gen_cmp ();
extern char *output_call ();

/* Use the proper incantation to search Posix-compliant libraries. */

#define LINK_SPEC \
"%{!traditional:-Eposix}%{traditional:-Enoposix}\
 -A__iob=___ap$iob\
 -A_use_libc_sema=___ap$use_libc_sema\
 -L /usr/lib"

/* Use the matching startup files. */

#define STARTFILE_SPEC \
"%{pg:/usr/lib/crt/gcrt0.o}\
%{!pg:%{p:/usr/lib/crt/mcrt0.o}\
%{!p:/usr/lib/crt/crt0.o}}"

/* Names to predefine in the preprocessor for this target machine.  */

#define CPP_PREDEFINES "-Dconvex -Dunix"

/* Print subsidiary information on the compiler version in use.  */

#define TARGET_VERSION fprintf (stderr, " (convex)");

/* Macros used in the machine description to test the flags.  */

/* 
   -mc1		C1 target (avoid C2-only instructions)
   -mc2		C2 target
   -mc32	vitesse
   -mc34	javelin
   -mc38	neptune
   -margcount	use standard calling sequence, with arg count word
   -mnoargcount don't push arg count, depend on symbol table
*/

#define TARGET_C1 (target_flags & 1)
#define TARGET_C2 (target_flags & 2)
#define TARGET_C34 (target_flags & 4)
#define TARGET_C38 (target_flags & 010)
#define TARGET_INDIRECTS (1)
#define TARGET_ARGCOUNT (target_flags & 040)

/* Macro to define tables used to set the flags.
   This is a list in braces of pairs in braces,
   each pair being { "NAME", VALUE }
   where VALUE is the bits to set or minus the bits to clear.
   An empty string NAME is used to identify the default VALUE.  */

#define TARGET_SWITCHES \
  { { "c1", 021 }, 	\
    { "c2", 022 },	\
    { "c32", 022 },	\
    { "c34", 006 },	\
    { "c38", 012 },	\
    { "noc1", -001 }, 	\
    { "noc2", -002 },	\
    { "argcount", 040 },  \
    { "noargcount", -040 }, \
    { "", TARGET_DEFAULT }}

/* Default target_flags if no switches specified.  */

#ifndef TARGET_DEFAULT
#define TARGET_DEFAULT 0
#endif

/* Allow $ in identifiers. */

#define DOLLARS_IN_IDENTIFIERS 2

/* Target machine storage layout */

/* Define this if most significant bit is lowest numbered
   in instructions that operate on numbered bit-fields. */
#define BITS_BIG_ENDIAN 1

/* Define this if most significant byte of a word is the lowest numbered.  */
#define BYTES_BIG_ENDIAN 1

/* Define this if most significant word of a multiword number is numbered.  */
#define WORDS_BIG_ENDIAN 1

/* Number of bits in an addressable storage unit */
#define BITS_PER_UNIT 8

/* Width in bits of a "word", which is the contents of a machine register.
   Note that this is not necessarily the width of data type `int';
   if using 16-bit ints on a 68000, this would still be 32.
   But on a machine with 16-bit registers, this would be 16.  */
#define BITS_PER_WORD 64

/* Width of a word, in units (bytes).  */
#define UNITS_PER_WORD 8

/* Width in bits of a pointer.
   See also the macro `Pmode' defined below.  */
#define POINTER_SIZE 32

/* Allocation boundary (in *bits*) for storing arguments in argument list.  */
#define PARM_BOUNDARY 32

/* Boundary (in *bits*) on which stack pointer should be aligned.  */
#define STACK_BOUNDARY 32

/* Allocation boundary (in *bits*) for the code of a function.  */
#define FUNCTION_BOUNDARY 16

/* Alignment of field after `int : 0' in a structure.  */
#define EMPTY_FIELD_BOUNDARY 32

/* Every structure's size must be a multiple of this.  */
#define STRUCTURE_SIZE_BOUNDARY 8

/* A bitfield declared as `int' forces `int' alignment for the struct.  */
#define PCC_BITFIELD_TYPE_MATTERS 1

/* No data type wants to be aligned rounder than this.  */
/* beware of doubles in structs -- 64 is incompatible with pcc */
#define BIGGEST_ALIGNMENT 32

/* Set this nonzero if move instructions will actually fail to work
   when given unaligned data.  */
#define STRICT_ALIGNMENT 0

/* Define sizes of basic C types to conform to ordinary usage -- these
   types depend on BITS_PER_WORD otherwise.  */
#define CHAR_TYPE_SIZE		8
#define SHORT_TYPE_SIZE		16
#define INT_TYPE_SIZE		32
#define LONG_TYPE_SIZE		32
#define LONG_LONG_TYPE_SIZE	64
#define FLOAT_TYPE_SIZE		32
#define DOUBLE_TYPE_SIZE	64
#define LONG_DOUBLE_TYPE_SIZE	64

/* Declare the standard types used by builtins to match convex stddef.h --
   with int rather than long.  */

#define SIZE_TYPE "unsigned int"
#define PTRDIFF_TYPE "int"

/* Standard register usage.  */

/* Number of actual hardware registers.
   The hardware registers are assigned numbers for the compiler
   from 0 to just below FIRST_PSEUDO_REGISTER.
   All registers that the compiler knows about must be given numbers,
   even those that are not normally considered general registers.  */
#define FIRST_PSEUDO_REGISTER 16

/* 1 for registers that have pervasive standard uses
   and are not available for the register allocator.
   For Convex, these are AP, FP, and SP.  */
#define FIXED_REGISTERS {0, 0, 0, 0, 0, 0, 0, 0, 1, 0, 0, 0, 0, 0, 1, 1} 

/* 1 for registers not available across function calls.
   These must include the FIXED_REGISTERS and also any
   registers that can be used without being saved.
   The latter must include the registers where values are returned
   and the register where structure-value addresses are passed.
   Aside from that, you can include as many other registers as you like.  */
#define CALL_USED_REGISTERS {1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1}

/* Return number of consecutive hard regs needed starting at reg REGNO
   to hold something of mode MODE.
   This is ordinarily the length in words of a value of mode MODE
   but can be less for certain modes in special long registers. */
#define HARD_REGNO_NREGS(REGNO, MODE) \
   ((GET_MODE_SIZE (MODE) + UNITS_PER_WORD - 1) / UNITS_PER_WORD)

/* Value is 1 if hard register REGNO can hold a value of machine-mode MODE.
   On Convex, S registers can hold any type, A registers any nonfloat. */
#define HARD_REGNO_MODE_OK(REGNO, MODE) \
  ((REGNO) < 8 || (GET_MODE_CLASS (MODE) != MODE_FLOAT &&		\
		   GET_MODE_CLASS (MODE) != MODE_COMPLEX_FLOAT &&	\
		   (MODE) != DImode))

/* Value is 1 if it is a good idea to tie two pseudo registers
   when one has mode MODE1 and one has mode MODE2.
   If HARD_REGNO_MODE_OK could produce different values for MODE1 and MODE2,
   for any hard reg, then this must be 0 for correct output.  */
#define MODES_TIEABLE_P(MODE1, MODE2)  \
    ((GET_MODE_CLASS (MODE1) == MODE_FLOAT \
      || GET_MODE_CLASS (MODE1) == MODE_COMPLEX_FLOAT \
      || (MODE1) == DImode) \
     == (GET_MODE_CLASS (MODE2) == MODE_FLOAT \
	 || GET_MODE_CLASS (MODE2) == MODE_COMPLEX_FLOAT \
	 || (MODE2) == DImode))

/* Specify the registers used for certain standard purposes.
   The values of these macros are register numbers.  */

/* Register to use for pushing function arguments.  */
#define STACK_POINTER_REGNUM 8

/* Base register for access to local variables of the function.  */
#define FRAME_POINTER_REGNUM 15

/* Value should be nonzero if functions must have frame pointers.
   Zero means the frame pointer need not be set up (and parms
   may be accessed via the stack pointer) in functions that seem suitable.
   This is computed in `reload', in reload1.c.  */
#define FRAME_POINTER_REQUIRED 1

/* Base register for access to arguments of the function.  */
#define ARG_POINTER_REGNUM 14

/* Register in which static-chain is passed to a function.
   Use S0, not an A reg, because this rare use would otherwise prevent
   an A reg from being available to global-alloc across calls.  */
#define STATIC_CHAIN_REGNUM 0

/* Register in which address to store a structure value
   is passed to a function.  */
#define STRUCT_VALUE_REGNUM 9

/* Define the classes of registers for register constraints in the
   machine description.  Also define ranges of constants.

   One of the classes must always be named ALL_REGS and include all hard regs.
   If there is more than one class, another class must be named NO_REGS
   and contain no registers.

   The name GENERAL_REGS must be the name of a class (or an alias for
   another name such as ALL_REGS).  This is the class of registers
   that is allowed by "g" or "r" in a register constraint.
   Also, registers outside this class are allocated only when
   instructions express preferences for them.

   The classes must be numbered in nondecreasing order; that is,
   a larger-numbered class must never be contained completely
   in a smaller-numbered class.

   For any two classes, it is very desirable that there be another
   class that represents their union.  */
   
/* Convex has classes A (address) and S (scalar).
   A is further divided into SP_REGS (stack pointer) and INDEX_REGS.
   Seems to work better to put S first, here and in the md. */

enum reg_class {
  NO_REGS, S_REGS, INDEX_REGS, SP_REGS, A_REGS, ALL_REGS, LIM_REG_CLASSES 
};

#define N_REG_CLASSES (int) LIM_REG_CLASSES

/* Since GENERAL_REGS is the same class as ALL_REGS,
   don't give it a different class number; just make it an alias.  */

#define GENERAL_REGS ALL_REGS

/* Give names of register classes as strings for dump file.   */

#define REG_CLASS_NAMES \
 {"NO_REGS", "S_REGS", "INDEX_REGS", "SP_REGS", "A_REGS", "ALL_REGS" }

/* Define which registers fit in which classes.
   This is an initializer for a vector of HARD_REG_SET
   of length N_REG_CLASSES.  */

#define REG_CLASS_CONTENTS {0, 0x00ff, 0xfe00, 0x0100, 0xff00, 0xffff}

/* The same information, inverted:
   Return the class number of the smallest class containing
   reg number REGNO.  This could be a conditional expression
   or could index an array.  */

#define REGNO_REG_CLASS(REGNO) \
  (S_REGNO_P (REGNO) ? S_REGS : REGNO == 8 ? SP_REGS : INDEX_REGS)

#define S_REGNO_P(REGNO) ((REGNO) < 8)
#define A_REGNO_P(REGNO) ((REGNO) >= 8)

#define S_REG_P(X) (REG_P (X) && S_REGNO_P (REGNO (X)))
#define A_REG_P(X) (REG_P (X) && A_REGNO_P (REGNO (X)))

/* The class value for index registers, and the one for base regs.  */

#define INDEX_REG_CLASS INDEX_REGS
#define BASE_REG_CLASS INDEX_REGS

/* Get reg_class from a letter such as appears in the machine description.  */
/* S regs use the letter 'd' because 's' is taken. */

#define REG_CLASS_FROM_LETTER(C) \
  ((C) == 'a' ? A_REGS : \
   (C) == 'd' ? S_REGS : \
   (C) == 'A' ? INDEX_REGS : \
   NO_REGS)

/* The letters I, J, K, L and M in a register constraint string
   can be used to stand for particular ranges of immediate operands.
   This macro defines what the ranges are.
   C is the letter, and VALUE is a constant value.
   Return 1 if VALUE is in the range specified by C.  */

/* Convex uses only I:
   32-bit value with sign bit off, usable as immediate in DImode logical 
     instructions and, or, xor */ 

#define CONST_OK_FOR_LETTER_P(VALUE, C)  ((VALUE) >= 0)

/* Similar, but for floating constants, and defining letters G and H.
   Here VALUE is the CONST_DOUBLE rtx itself.  */
/* Convex uses only G:
   value usable in ld.d (low word 0) or ld.l (high word all sign) */

#define CONST_DOUBLE_OK_FOR_LETTER_P(VALUE, C) \
  (LD_D_P (VALUE) || LD_L_P (VALUE))

#define LD_D_P(X) (const_double_low_int (X) == 0)

#define LD_L_P(X) (const_double_low_int (X) >= 0 \
		   ? const_double_high_int (X) == 0 \
		   : const_double_high_int (X) == -1)

/* Given an rtx X being reloaded into a reg required to be
   in class CLASS, return the class of reg to actually use.
   In general this is just CLASS; but on some machines
   in some cases it is preferable to use a more restrictive class.  */

/* CONST_DOUBLEs (constraint 'F') are passed by LEGITIMATE_CONSTANT_P
   without regard to their value.  Constraint 'G' is used by instructions
   that need to reject non-immediate values.  The rejected values are
   dealt with by reload -- PREFERRED_RELOAD_CLASS returns NO_REGS for
   nonimmediate values, causing reload to put them in memory.  Every insn
   that uses 'G' must have an alternative that accepts memory.  */

#define PREFERRED_RELOAD_CLASS(X,CLASS)	\
  (GET_CODE (X) != CONST_DOUBLE ? (CLASS) : \
   (GET_MODE (X) != TFmode && (LD_L_P (X) || LD_D_P (X))) ? (CLASS) : NO_REGS)
   
/* Return the maximum number of consecutive registers
   needed to represent mode MODE in a register of class CLASS.  */
#define CLASS_MAX_NREGS(CLASS, MODE)  ((GET_MODE_SIZE (MODE) + 7) / 8)

/* Stack layout; function entry, exit and calling.  */

/* Define this if pushing a word on the stack
   makes the stack pointer a smaller address.  */
#define STACK_GROWS_DOWNWARD

/* Define this if the nominal address of the stack frame
   is at the high-address end of the local variables;
   that is, each additional local variable allocated
   goes at a more negative offset in the frame.  */
#define FRAME_GROWS_DOWNWARD

/* Define this if should default to -fcaller-saves.  */
#define DEFAULT_CALLER_SAVES

/* Offset within stack frame to start allocating local variables at.
   If FRAME_GROWS_DOWNWARD, this is the offset to the END of the
   first local allocated.  Otherwise, it is the offset to the BEGINNING
   of the first local allocated.  */
#define STARTING_FRAME_OFFSET 0

/* If we generate an insn to push BYTES bytes,
   this says how many the stack pointer really advances by. */
#define PUSH_ROUNDING(BYTES) (((BYTES) + 3) & ~3)

/* Offset of first parameter from the argument pointer register value.  */
#define FIRST_PARM_OFFSET(FNDECL) 0

/* Value is the number of bytes of arguments automatically
   popped when returning from a subroutine call.