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[gcc.git] / gcc / machmode.h

/* Machine mode definitions for GNU C-Compiler; included by rtl.h and tree.h.
   Copyright (C) 1991  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.  */


#ifndef HAVE_MACHINE_MODES

/* Strictly speaking, this isn't the proper place to include these definitions,
   but this file is included by every GCC file.

   Some systems define these in, e.g., param.h.  We undefine these names
   here to avoid the warnings.  We prefer to use our definitions since we
   know they are correct.  */

#undef MIN
#undef MAX

#define MIN(X,Y) ((X) < (Y) ? (X) : (Y))
#define MAX(X,Y) ((X) > (Y) ? (X) : (Y))

/* Make an enum class that gives all the machine modes.  */

#define DEF_MACHMODE(SYM, NAME, TYPE, SIZE, UNIT, WIDER)  SYM,

enum machine_mode {
#include "machmode.def"

#ifdef EXTRA_CC_MODES
  EXTRA_CC_MODES,
#endif
MAX_MACHINE_MODE };

#undef DEF_MACHMODE

#define HAVE_MACHINE_MODES

#ifndef NUM_MACHINE_MODES
#define NUM_MACHINE_MODES (int) MAX_MACHINE_MODE
#endif

/* Get the name of mode MODE as a string.  */

extern char *mode_name[];
#define GET_MODE_NAME(MODE)		(mode_name[(int)(MODE)])

enum mode_class { MODE_RANDOM, MODE_INT, MODE_FLOAT, MODE_PARTIAL_INT, MODE_CC,
		  MODE_COMPLEX_INT, MODE_COMPLEX_FLOAT, MAX_MODE_CLASS};

/* Get the general kind of object that mode MODE represents
   (integer, floating, complex, etc.)  */

extern enum mode_class mode_class[];
#define GET_MODE_CLASS(MODE)		(mode_class[(int)(MODE)])

/* Get the size in bytes of an object of mode MODE.  */

extern int mode_size[];
#define GET_MODE_SIZE(MODE)		(mode_size[(int)(MODE)])

/* Get the size in bytes of the basic parts of an object of mode MODE.  */

extern int mode_unit_size[];
#define GET_MODE_UNIT_SIZE(MODE)	(mode_unit_size[(int)(MODE)])

/* Get the number of units in the object.  */

#define GET_MODE_NUNITS(MODE)  \
  (GET_MODE_SIZE ((MODE)) / GET_MODE_UNIT_SIZE ((MODE)))

/* Get the size in bits of an object of mode MODE.  */

#define GET_MODE_BITSIZE(MODE)  (BITS_PER_UNIT * mode_size[(int)(MODE)])

/* Get a bitmask containing 1 for all bits in a word
   that fit within mode MODE.  */

#define GET_MODE_MASK(MODE)  \
   ((GET_MODE_BITSIZE (MODE) >= HOST_BITS_PER_INT)  \
    ? -1 : ((1 << GET_MODE_BITSIZE (MODE)) - 1))

/* Get the next wider natural mode (eg, QI -> HI -> SI -> DI -> TI).  */

extern enum machine_mode mode_wider_mode[];
#define GET_MODE_WIDER_MODE(MODE)	(mode_wider_mode[(int)(MODE)])

/* Find the best mode to use to access a bit field.  */

extern enum machine_mode get_best_mode ();

/* Determine alignment, 1<=result<=BIGGEST_ALIGNMENT.  */

#define GET_MODE_ALIGNMENT(MODE)   \
  MIN (BIGGEST_ALIGNMENT, 	   \
       MAX (1, (GET_MODE_UNIT_SIZE (MODE) * BITS_PER_UNIT)))

/* For each class, get the narrowest mode in that class.  */

extern enum machine_mode class_narrowest_mode[];
#define GET_CLASS_NARROWEST_MODE(CLASS) class_narrowest_mode[(int)(CLASS)]

/* Define the integer modes whose sizes are BITS_PER_UNIT
   and BITS_PER_WORD.  */

extern enum machine_mode byte_mode;
extern enum machine_mode word_mode;

#endif /* not HAVE_MACHINE_MODES */