gcc/machmode.def

   1 /* This file contains the definitions and documentation for the
   2    machine modes used in the GNU compiler.
   3    Copyright (C) 1987, 1992, 1994, 1997, 1998, 2000 Free Software Foundation, Inc.
   4
   5 This file is part of GCC.
   6
   7 GCC is free software; you can redistribute it and/or modify it under
   8 the terms of the GNU General Public License as published by the Free
   9 Software Foundation; either version 2, or (at your option) any later
  10 version.
  11
  12 GCC is distributed in the hope that it will be useful, but WITHOUT ANY
  13 WARRANTY; without even the implied warranty of MERCHANTABILITY or
  14 FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  15 for more details.
  16
  17 You should have received a copy of the GNU General Public License
  18 along with GCC; see the file COPYING.  If not, write to the Free
  19 Software Foundation, 59 Temple Place - Suite 330, Boston, MA
  20 02111-1307, USA.  */
  21
  22
  23 /* This file defines all the MACHINE MODES used by GCC.
  24
  25    A machine mode specifies a size and format of data
  26    at the machine level.
  27
  28    Each RTL expression has a machine mode.
  29
  30    At the syntax tree level, each ..._TYPE and each ..._DECL node
  31    has a machine mode which describes data of that type or the
  32    data of the variable declared.  */
  33
  34 /* The first argument is the internal name of the machine mode
  35    used in the C source.
  36    By convention these are in UPPER_CASE, except for the word  "mode".
  37
  38    The second argument  is the name of the machine mode in the
  39    external ASCII format used for reading and printing RTL and trees.
  40    By convention these names in UPPER_CASE.
  41
  42    Third argument states the kind of representation:
  43    MODE_INT - integer
  44    MODE_FLOAT - floating
  45    MODE_PARTIAL_INT - PQImode, PHImode, PSImode and PDImode
  46    MODE_CC - modes used for representing the condition code in a register
  47    MODE_COMPLEX_INT, MODE_COMPLEX_FLOAT - complex number
  48    MODE_VECTOR_INT, MODE_VECTOR_FLOAT - vector
  49    MODE_RANDOM - anything else
  50
  51    Fourth argument is the relative size of the object, in bits,
  52    so we can have modes smaller than 1 byte.
  53
  54    Fifth argument is the relative size of the object, in bytes.
  55    It is zero when the size is meaningless or not determined.
  56    A byte's size is determined by BITS_PER_UNIT in tm.h.
  57
  58    Sixth arg is the relative size of subunits of the object.
  59    It is same as the fifth argument except for complexes and vectors,
  60    since they are really made of many equal size subunits.
  61
  62    Seventh arg is next wider natural mode of the same class.  0 if
  63    there is none.  Vector modes use this field to point to the next
  64    vector size, so we can iterate through the different vectors modes.
  65    The ordering is by increasing byte size, with QI coming before HI,
  66    HI before SI, etc.
  67
  68    Eigth arg is the mode of the internal elements in a vector or
  69    complex, and VOIDmode if not applicable.
  70 */
  71
  72 /* VOIDmode is used when no mode needs to be specified,
  73    as for example on CONST_INT RTL expressions.  */
  74 DEF_MACHMODE (VOIDmode, "VOID", MODE_RANDOM, 0, 0, 0, VOIDmode, VOIDmode)
  75
  76 DEF_MACHMODE (BImode, "BI", MODE_INT, 1, 1, 1, QImode, VOIDmode)
  77 DEF_MACHMODE (QImode, "QI", MODE_INT, BITS_PER_UNIT, 1, 1, HImode, VOIDmode)
  78 DEF_MACHMODE (HImode, "HI", MODE_INT, BITS_PER_UNIT*2, 2, 2, SImode, VOIDmode)
  79 DEF_MACHMODE (SImode, "SI", MODE_INT, BITS_PER_UNIT*4, 4, 4, DImode, VOIDmode)
  80 DEF_MACHMODE (DImode, "DI", MODE_INT, BITS_PER_UNIT*8, 8, 8, TImode, VOIDmode)
  81 DEF_MACHMODE (TImode, "TI", MODE_INT, BITS_PER_UNIT*16, 16, 16, OImode, VOIDmode)
  82 DEF_MACHMODE (OImode, "OI", MODE_INT, BITS_PER_UNIT*32, 32, 32, VOIDmode, VOIDmode)
  83
  84 /* Pointers on some machines use these types to distinguish them from
  85    ints.  Useful if a pointer is 4 bytes but has some bits that are
  86    not significant, so it is really not quite as wide as an integer.  */
  87 DEF_MACHMODE (PQImode, "PQI", MODE_PARTIAL_INT, BITS_PER_UNIT, 1, 1, PHImode, VOIDmode)
  88 DEF_MACHMODE (PHImode, "PHI", MODE_PARTIAL_INT, BITS_PER_UNIT*2, 2, 2, PSImode, VOIDmode)
  89 DEF_MACHMODE (PSImode, "PSI", MODE_PARTIAL_INT, BITS_PER_UNIT*4, 4, 4, PDImode, VOIDmode)
  90 DEF_MACHMODE (PDImode, "PDI", MODE_PARTIAL_INT, BITS_PER_UNIT*8, 8, 8, VOIDmode, VOIDmode)
  91
  92 DEF_MACHMODE (QFmode, "QF", MODE_FLOAT, BITS_PER_UNIT, 1, 1, HFmode, VOIDmode)
  93 DEF_MACHMODE (HFmode, "HF", MODE_FLOAT, BITS_PER_UNIT*2, 2, 2, TQFmode, VOIDmode)
  94 DEF_MACHMODE (TQFmode, "TQF", MODE_FLOAT, BITS_PER_UNIT*3, 3, 3, SFmode, VOIDmode) /* MIL-STD-1750A */
  95 DEF_MACHMODE (SFmode, "SF", MODE_FLOAT, BITS_PER_UNIT*4, 4, 4, DFmode, VOIDmode)
  96 DEF_MACHMODE (DFmode, "DF", MODE_FLOAT, BITS_PER_UNIT*8, 8, 8, XFmode, VOIDmode)
  97 DEF_MACHMODE (XFmode, "XF", MODE_FLOAT, BITS_PER_UNIT*12, 12, 12, TFmode, VOIDmode) /* IEEE extended */
  98 DEF_MACHMODE (TFmode, "TF", MODE_FLOAT, BITS_PER_UNIT*16, 16, 16, VOIDmode, VOIDmode)
  99
 100 /* Complex modes.  */
 101 DEF_MACHMODE (QCmode, "QC", MODE_COMPLEX_FLOAT, BITS_PER_UNIT*2, 2, 1, HCmode, QFmode)
 102 DEF_MACHMODE (HCmode, "HC", MODE_COMPLEX_FLOAT, BITS_PER_UNIT*4, 4, 2, SCmode, HFmode)
 103 DEF_MACHMODE (SCmode, "SC", MODE_COMPLEX_FLOAT, BITS_PER_UNIT*8, 8, 4, DCmode, SFmode)
 104 DEF_MACHMODE (DCmode, "DC", MODE_COMPLEX_FLOAT, BITS_PER_UNIT*16, 16, 8, XCmode, DFmode)
 105 DEF_MACHMODE (XCmode, "XC", MODE_COMPLEX_FLOAT, BITS_PER_UNIT*24, 24, 12, TCmode, XFmode)
 106 DEF_MACHMODE (TCmode, "TC", MODE_COMPLEX_FLOAT, BITS_PER_UNIT*32, 32, 16, VOIDmode, TFmode)
 107
 108 DEF_MACHMODE (CQImode, "CQI", MODE_COMPLEX_INT, BITS_PER_UNIT*2, 2, 1, CHImode, QImode)
 109 DEF_MACHMODE (CHImode, "CHI", MODE_COMPLEX_INT, BITS_PER_UNIT*4, 4, 2, CSImode, HImode)
 110 DEF_MACHMODE (CSImode, "CSI", MODE_COMPLEX_INT, BITS_PER_UNIT*8, 8, 4, CDImode, SImode)
 111 DEF_MACHMODE (CDImode, "CDI", MODE_COMPLEX_INT, BITS_PER_UNIT*16, 16, 8, CTImode, DImode)
 112 DEF_MACHMODE (CTImode, "CTI", MODE_COMPLEX_INT, BITS_PER_UNIT*32, 32, 16, COImode, TImode)
 113 DEF_MACHMODE (COImode, "COI", MODE_COMPLEX_INT, BITS_PER_UNIT*64, 64, 32, VOIDmode, OImode)
 114
 115 /* Vector modes.  */
 116 /* There are no V1xx vector modes.  These are equivalent to normal
 117    scalar modes.  */
 118 /* The wider mode field for vectors follows in order of increasing bit
 119    size with QI coming before HI, HI before SI, and SI before DI
 120    within same bit sizes.  */
 121 DEF_MACHMODE (V2QImode, "V2QI", MODE_VECTOR_INT, BITS_PER_UNIT*2, 2, 1, V4QImode, QImode)
 122 DEF_MACHMODE (V2HImode, "V2HI", MODE_VECTOR_INT, BITS_PER_UNIT*4, 4, 2, V8QImode, HImode)
 123 DEF_MACHMODE (V2SImode, "V2SI", MODE_VECTOR_INT, BITS_PER_UNIT*8, 8, 4, V16QImode, SImode)
 124 DEF_MACHMODE (V2DImode, "V2DI", MODE_VECTOR_INT, BITS_PER_UNIT*16, 16, 8, V8SImode, DImode)
 125
 126 DEF_MACHMODE (V4QImode, "V4QI", MODE_VECTOR_INT, BITS_PER_UNIT*4, 4, 1, V2HImode, QImode)
 127 DEF_MACHMODE (V4HImode, "V4HI", MODE_VECTOR_INT, BITS_PER_UNIT*8, 8, 2, V2SImode, HImode)
 128 DEF_MACHMODE (V4SImode, "V4SI", MODE_VECTOR_INT, BITS_PER_UNIT*16, 16, 4, V2DImode, SImode)
 129 DEF_MACHMODE (V4DImode, "V4DI", MODE_VECTOR_INT, BITS_PER_UNIT*32, 32, 8, V8DImode, DImode)
 130
 131 DEF_MACHMODE (V8QImode, "V8QI", MODE_VECTOR_INT, BITS_PER_UNIT*8, 8, 1, V4HImode, QImode)
 132 DEF_MACHMODE (V8HImode, "V8HI", MODE_VECTOR_INT, BITS_PER_UNIT*16, 16, 2, V4SImode, HImode)
 133 DEF_MACHMODE (V8SImode, "V8SI", MODE_VECTOR_INT, BITS_PER_UNIT*32, 32, 4, V4DImode, SImode)
 134 DEF_MACHMODE (V8DImode, "V8DI", MODE_VECTOR_INT, BITS_PER_UNIT*64, 64, 8, VOIDmode, DImode)
 135
 136 DEF_MACHMODE (V16QImode, "V16QI", MODE_VECTOR_INT, BITS_PER_UNIT*16, 16, 1, V8HImode, QImode)
 137
 138 DEF_MACHMODE (V2SFmode, "V2SF", MODE_VECTOR_FLOAT, BITS_PER_UNIT*8, 8, 4, V4SFmode, SFmode)
 139 DEF_MACHMODE (V2DFmode, "V2DF", MODE_VECTOR_FLOAT, BITS_PER_UNIT*16, 16, 8, V8SFmode, DFmode)
 140
 141 DEF_MACHMODE (V4SFmode, "V4SF", MODE_VECTOR_FLOAT, BITS_PER_UNIT*16, 16, 4, V2DFmode, SFmode)
 142 DEF_MACHMODE (V4DFmode, "V4DF", MODE_VECTOR_FLOAT, BITS_PER_UNIT*32, 32, 8, V8DFmode, DFmode)
 143
 144 DEF_MACHMODE (V8SFmode, "V8SF", MODE_VECTOR_FLOAT, BITS_PER_UNIT*32, 32, 4,V4DFmode, SFmode)
 145 DEF_MACHMODE (V8DFmode, "V8DF", MODE_VECTOR_FLOAT, BITS_PER_UNIT*64, 64, 8, VOIDmode, DFmode)
 146 DEF_MACHMODE (V16SFmode, "V16SF", MODE_VECTOR_FLOAT, 512, 64, 4, VOIDmode, SFmode)
 147
 148 /* BLKmode is used for structures, arrays, etc.
 149    that fit no more specific mode.  */
 150 DEF_MACHMODE (BLKmode, "BLK", MODE_RANDOM, 0, 0, 0, VOIDmode, VOIDmode)
 151
 152 /* The modes for representing the condition codes come last.  CCmode
 153    is always defined.  Additional modes for the condition code can be
 154    specified in the EXTRA_CC_MODES header.  All MODE_CC modes are the
 155    same width as SImode and have VOIDmode as their next wider mode.  */
 156
 157 /* We do not use CC() for CCmode to avoid a warning about use of
 158    function-like macros with no arguments.  */
 159 DEF_MACHMODE (CCmode, "CC", MODE_CC, BITS_PER_UNIT*4, 4, 4, VOIDmode, VOIDmode)
 160
 161 #ifdef EXTRA_MODES_FILE
 162 #define CC(N)  \
 163   DEF_MACHMODE (CONCAT2 (N,mode), STRINGX (N), \
 164                 MODE_CC, BITS_PER_UNIT*4, 4, 4, VOIDmode, VOIDmode)
 165 #include EXTRA_MODES_FILE
 166 #undef CC
 167 #endif
 168
 169 /* The symbol Pmode stands for one of the above machine modes (usually SImode).
 170    The tm file specifies which one.  It is not a distinct mode.  */
 171
 172 /*
 173 Local variables:
 174 mode:c
 175 version-control: t
 176 End:
 177 */