/* This file contains the definitions and documentation for the
   machine modes used in the GNU compiler.
   Copyright (C) 1987, 1992, 1994, 1997, 1998, 2000 Free Software Foundation, Inc.

This file is part of GCC.

GCC 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.

GCC 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 GCC; see the file COPYING.  If not, write to the Free
Software Foundation, 59 Temple Place - Suite 330, Boston, MA
02111-1307, USA.  */


/* This file defines all the MACHINE MODES used by GCC.

   A machine mode specifies a size and format of data
   at the machine level.

   Each RTL expression has a machine mode.

   At the syntax tree level, each ..._TYPE and each ..._DECL node
   has a machine mode which describes data of that type or the
   data of the variable declared.  */

/* The first argument is the internal name of the machine mode
   used in the C source.
   By convention these are in UPPER_CASE, except for the word  "mode".

   The second argument  is the name of the machine mode in the
   external ASCII format used for reading and printing RTL and trees.
   By convention these names in UPPER_CASE.

   Third argument states the kind of representation:
   MODE_INT - integer
   MODE_FLOAT - floating
   MODE_PARTIAL_INT - PQImode, PHImode, PSImode and PDImode
   MODE_CC - modes used for representing the condition code in a register
   MODE_COMPLEX_INT, MODE_COMPLEX_FLOAT - complex number
   MODE_VECTOR_INT, MODE_VECTOR_FLOAT - vector
   MODE_RANDOM - anything else

   Fourth argument is the relative size of the object, in bits,
   so we can have modes smaller than 1 byte.

   Fifth argument is the relative size of the object, in bytes.
   It is zero when the size is meaningless or not determined.
   A byte's size is determined by BITS_PER_UNIT in tm.h. 

   Sixth arg is the relative size of subunits of the object.
   It is same as the fifth argument except for complexes and vectors,
   since they are really made of many equal size subunits.

   Seventh arg is next wider natural mode of the same class.  0 if
   there is none.  Vector modes use this field to point to the next
   vector size, so we can iterate through the different vectors modes.
   The ordering is by increasing byte size, with QI coming before HI,
   HI before SI, etc.

   Eigth arg is the mode of the internal elements in a vector or
   complex, and VOIDmode if not applicable.
*/

/* VOIDmode is used when no mode needs to be specified,
   as for example on CONST_INT RTL expressions.  */
DEF_MACHMODE (VOIDmode, "VOID", MODE_RANDOM, 0, 0, 0, VOIDmode, VOIDmode)

DEF_MACHMODE (BImode, "BI", MODE_INT, 1, 1, 1, QImode, VOIDmode)
DEF_MACHMODE (QImode, "QI", MODE_INT, BITS_PER_UNIT, 1, 1, HImode, VOIDmode)
DEF_MACHMODE (HImode, "HI", MODE_INT, BITS_PER_UNIT*2, 2, 2, SImode, VOIDmode)
DEF_MACHMODE (SImode, "SI", MODE_INT, BITS_PER_UNIT*4, 4, 4, DImode, VOIDmode)
DEF_MACHMODE (DImode, "DI", MODE_INT, BITS_PER_UNIT*8, 8, 8, TImode, VOIDmode)
DEF_MACHMODE (TImode, "TI", MODE_INT, BITS_PER_UNIT*16, 16, 16, OImode, VOIDmode)
DEF_MACHMODE (OImode, "OI", MODE_INT, BITS_PER_UNIT*32, 32, 32, VOIDmode, VOIDmode)

/* Pointers on some machines use these types to distinguish them from
   ints.  Useful if a pointer is 4 bytes but has some bits that are
   not significant, so it is really not quite as wide as an integer.  */
DEF_MACHMODE (PQImode, "PQI", MODE_PARTIAL_INT, BITS_PER_UNIT, 1, 1, PHImode, VOIDmode)
DEF_MACHMODE (PHImode, "PHI", MODE_PARTIAL_INT, BITS_PER_UNIT*2, 2, 2, PSImode, VOIDmode)
DEF_MACHMODE (PSImode, "PSI", MODE_PARTIAL_INT, BITS_PER_UNIT*4, 4, 4, PDImode, VOIDmode)
DEF_MACHMODE (PDImode, "PDI", MODE_PARTIAL_INT, BITS_PER_UNIT*8, 8, 8, VOIDmode, VOIDmode)

DEF_MACHMODE (QFmode, "QF", MODE_FLOAT, BITS_PER_UNIT, 1, 1, HFmode, VOIDmode)
DEF_MACHMODE (HFmode, "HF", MODE_FLOAT, BITS_PER_UNIT*2, 2, 2, TQFmode, VOIDmode)
DEF_MACHMODE (TQFmode, "TQF", MODE_FLOAT, BITS_PER_UNIT*3, 3, 3, SFmode, VOIDmode) /* MIL-STD-1750A */
DEF_MACHMODE (SFmode, "SF", MODE_FLOAT, BITS_PER_UNIT*4, 4, 4, DFmode, VOIDmode)
DEF_MACHMODE (DFmode, "DF", MODE_FLOAT, BITS_PER_UNIT*8, 8, 8, XFmode, VOIDmode)
DEF_MACHMODE (XFmode, "XF", MODE_FLOAT, BITS_PER_UNIT*12, 12, 12, TFmode, VOIDmode) /* IEEE extended */
DEF_MACHMODE (TFmode, "TF", MODE_FLOAT, BITS_PER_UNIT*16, 16, 16, VOIDmode, VOIDmode)

/* Complex modes.  */
DEF_MACHMODE (QCmode, "QC", MODE_COMPLEX_FLOAT, BITS_PER_UNIT*2, 2, 1, HCmode, QFmode)
DEF_MACHMODE (HCmode, "HC", MODE_COMPLEX_FLOAT, BITS_PER_UNIT*4, 4, 2, SCmode, HFmode)
DEF_MACHMODE (SCmode, "SC", MODE_COMPLEX_FLOAT, BITS_PER_UNIT*8, 8, 4, DCmode, SFmode)
DEF_MACHMODE (DCmode, "DC", MODE_COMPLEX_FLOAT, BITS_PER_UNIT*16, 16, 8, XCmode, DFmode)
DEF_MACHMODE (XCmode, "XC", MODE_COMPLEX_FLOAT, BITS_PER_UNIT*24, 24, 12, TCmode, XFmode)
DEF_MACHMODE (TCmode, "TC", MODE_COMPLEX_FLOAT, BITS_PER_UNIT*32, 32, 16, VOIDmode, TFmode)

DEF_MACHMODE (CQImode, "CQI", MODE_COMPLEX_INT, BITS_PER_UNIT*2, 2, 1, CHImode, QImode)
DEF_MACHMODE (CHImode, "CHI", MODE_COMPLEX_INT, BITS_PER_UNIT*4, 4, 2, CSImode, HImode)
DEF_MACHMODE (CSImode, "CSI", MODE_COMPLEX_INT, BITS_PER_UNIT*8, 8, 4, CDImode, SImode)
DEF_MACHMODE (CDImode, "CDI", MODE_COMPLEX_INT, BITS_PER_UNIT*16, 16, 8, CTImode, DImode)
DEF_MACHMODE (CTImode, "CTI", MODE_COMPLEX_INT, BITS_PER_UNIT*32, 32, 16, COImode, TImode)
DEF_MACHMODE (COImode, "COI", MODE_COMPLEX_INT, BITS_PER_UNIT*64, 64, 32, VOIDmode, OImode)

/* Vector modes.  */
/* The wider mode field for vectors follows in order of increasing bit
   size with QI coming before HI, HI before SI, and SI before DI
   within same bit sizes.  */
DEF_MACHMODE (V1DImode, "V1DI", MODE_VECTOR_INT, BITS_PER_UNIT*8, 8, 8, V2QImode, DImode)
DEF_MACHMODE (V2QImode, "V2QI", MODE_VECTOR_INT, BITS_PER_UNIT*2, 2, 1, V4QImode, QImode)
DEF_MACHMODE (V2HImode, "V2HI", MODE_VECTOR_INT, BITS_PER_UNIT*4, 4, 2, V8QImode, HImode)
DEF_MACHMODE (V2SImode, "V2SI", MODE_VECTOR_INT, BITS_PER_UNIT*8, 8, 4, V16QImode, SImode)
DEF_MACHMODE (V2DImode, "V2DI", MODE_VECTOR_INT, BITS_PER_UNIT*16, 16, 8, V8SImode, DImode)

DEF_MACHMODE (V4QImode, "V4QI", MODE_VECTOR_INT, BITS_PER_UNIT*4, 4, 1, V2HImode, QImode)
DEF_MACHMODE (V4HImode, "V4HI", MODE_VECTOR_INT, BITS_PER_UNIT*8, 8, 2, V2SImode, HImode)
DEF_MACHMODE (V4SImode, "V4SI", MODE_VECTOR_INT, BITS_PER_UNIT*16, 16, 4, V2DImode, SImode)
DEF_MACHMODE (V4DImode, "V4DI", MODE_VECTOR_INT, BITS_PER_UNIT*32, 32, 8, V8DImode, DImode)

DEF_MACHMODE (V8QImode, "V8QI", MODE_VECTOR_INT, BITS_PER_UNIT*8, 8, 1, V4HImode, QImode)
DEF_MACHMODE (V8HImode, "V8HI", MODE_VECTOR_INT, BITS_PER_UNIT*16, 16, 2, V4SImode, HImode)
DEF_MACHMODE (V8SImode, "V8SI", MODE_VECTOR_INT, BITS_PER_UNIT*32, 32, 4, V4DImode, SImode)
DEF_MACHMODE (V8DImode, "V8DI", MODE_VECTOR_INT, BITS_PER_UNIT*64, 64, 8, VOIDmode, DImode)

DEF_MACHMODE (V16QImode, "V16QI", MODE_VECTOR_INT, BITS_PER_UNIT*16, 16, 1, V8HImode, QImode)

DEF_MACHMODE (V2HFmode, "V2HF", MODE_VECTOR_FLOAT, BITS_PER_UNIT*4, 4, 2, V4HFmode, HFmode)
DEF_MACHMODE (V2SFmode, "V2SF", MODE_VECTOR_FLOAT, BITS_PER_UNIT*8, 8, 4, V4SFmode, SFmode)
DEF_MACHMODE (V2DFmode, "V2DF", MODE_VECTOR_FLOAT, BITS_PER_UNIT*16, 16, 8, V8SFmode, DFmode)

DEF_MACHMODE (V4HFmode, "V4HF", MODE_VECTOR_FLOAT, BITS_PER_UNIT*8,  8,  2, V2SFmode, HFmode)
DEF_MACHMODE (V4SFmode, "V4SF", MODE_VECTOR_FLOAT, BITS_PER_UNIT*16, 16, 4, V2DFmode, SFmode)
DEF_MACHMODE (V4DFmode, "V4DF", MODE_VECTOR_FLOAT, BITS_PER_UNIT*32, 32, 8, V8DFmode, DFmode)

DEF_MACHMODE (V8HFmode, "V8HF", MODE_VECTOR_FLOAT, BITS_PER_UNIT*16, 16, 2, V4SFmode, HFmode)
DEF_MACHMODE (V8SFmode, "V8SF", MODE_VECTOR_FLOAT, BITS_PER_UNIT*32, 32, 4, V4DFmode, SFmode)
DEF_MACHMODE (V8DFmode, "V8DF", MODE_VECTOR_FLOAT, BITS_PER_UNIT*64, 64, 8, VOIDmode, DFmode)
DEF_MACHMODE (V16SFmode, "V16SF", MODE_VECTOR_FLOAT, 512, 64, 4, VOIDmode, SFmode)

/* BLKmode is used for structures, arrays, etc.
   that fit no more specific mode.  */
DEF_MACHMODE (BLKmode, "BLK", MODE_RANDOM, 0, 0, 0, VOIDmode, VOIDmode)

/* The modes for representing the condition codes come last.  CCmode
   is always defined.  Additional modes for the condition code can be
   specified in the EXTRA_CC_MODES header.  All MODE_CC modes are the
   same width as SImode and have VOIDmode as their next wider mode.  */

/* We do not use CC() for CCmode to avoid a warning about use of
   function-like macros with no arguments.  */
DEF_MACHMODE (CCmode, "CC", MODE_CC, BITS_PER_UNIT*4, 4, 4, VOIDmode, VOIDmode)

#ifdef EXTRA_MODES_FILE
#define CC(N)  \
  DEF_MACHMODE (N##mode, #N, \
                MODE_CC, BITS_PER_UNIT*4, 4, 4, VOIDmode, VOIDmode)
#include EXTRA_MODES_FILE
#undef CC
#endif

/* The symbol Pmode stands for one of the above machine modes (usually SImode).
   The tm file specifies which one.  It is not a distinct mode.  */

/*
Local variables:
mode:c
version-control: t
End:
*/
