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 /* VOIDmode is used when no mode needs to be specified,
  69    as for example on CONST_INT RTL expressions.  */
  70 DEF_MACHMODE (VOIDmode, "VOID", MODE_RANDOM, 0, 0, 0, VOIDmode)
  71
  72 DEF_MACHMODE (BImode, "BI", MODE_INT, 1, 1, 1, QImode)
  73 DEF_MACHMODE (QImode, "QI", MODE_INT, BITS_PER_UNIT, 1, 1, HImode)
  74 DEF_MACHMODE (HImode, "HI", MODE_INT, BITS_PER_UNIT*2, 2, 2, SImode)
  75 DEF_MACHMODE (SImode, "SI", MODE_INT, BITS_PER_UNIT*4, 4, 4, DImode)
  76 DEF_MACHMODE (DImode, "DI", MODE_INT, BITS_PER_UNIT*8, 8, 8, TImode)
  77 DEF_MACHMODE (TImode, "TI", MODE_INT, BITS_PER_UNIT*16, 16, 16, OImode)
  78 DEF_MACHMODE (OImode, "OI", MODE_INT, BITS_PER_UNIT*32, 32, 32, VOIDmode)
  79
  80 /* Pointers on some machines use these types to distinguish them from
  81    ints.  Useful if a pointer is 4 bytes but has some bits that are
  82    not significant, so it is really not quite as wide as an integer.  */
  83 DEF_MACHMODE (PQImode, "PQI", MODE_PARTIAL_INT, BITS_PER_UNIT, 1, 1, PHImode)
  84 DEF_MACHMODE (PHImode, "PHI", MODE_PARTIAL_INT, BITS_PER_UNIT*2, 2, 2, PSImode)
  85 DEF_MACHMODE (PSImode, "PSI", MODE_PARTIAL_INT, BITS_PER_UNIT*4, 4, 4, PDImode)
  86 DEF_MACHMODE (PDImode, "PDI", MODE_PARTIAL_INT, BITS_PER_UNIT*8, 8, 8, VOIDmode)
  87
  88 DEF_MACHMODE (QFmode, "QF", MODE_FLOAT, BITS_PER_UNIT, 1, 1, HFmode)
  89 DEF_MACHMODE (HFmode, "HF", MODE_FLOAT, BITS_PER_UNIT*2, 2, 2, TQFmode)
  90 DEF_MACHMODE (TQFmode, "TQF", MODE_FLOAT, BITS_PER_UNIT*3, 3, 3, SFmode) /* MIL-STD-1750A */
  91 DEF_MACHMODE (SFmode, "SF", MODE_FLOAT, BITS_PER_UNIT*4, 4, 4, DFmode)
  92 DEF_MACHMODE (DFmode, "DF", MODE_FLOAT, BITS_PER_UNIT*8, 8, 8, XFmode)
  93 DEF_MACHMODE (XFmode, "XF", MODE_FLOAT, BITS_PER_UNIT*12, 12, 12, TFmode) /* IEEE extended */
  94 DEF_MACHMODE (TFmode, "TF", MODE_FLOAT, BITS_PER_UNIT*16, 16, 16, VOIDmode)
  95
  96 /* Complex modes.  */
  97 DEF_MACHMODE (QCmode, "QC", MODE_COMPLEX_FLOAT, BITS_PER_UNIT*2, 2, 1, HCmode)
  98 DEF_MACHMODE (HCmode, "HC", MODE_COMPLEX_FLOAT, BITS_PER_UNIT*4, 4, 2, SCmode)
  99 DEF_MACHMODE (SCmode, "SC", MODE_COMPLEX_FLOAT, BITS_PER_UNIT*8, 8, 4, DCmode)
 100 DEF_MACHMODE (DCmode, "DC", MODE_COMPLEX_FLOAT, BITS_PER_UNIT*16, 16, 8, XCmode)
 101 DEF_MACHMODE (XCmode, "XC", MODE_COMPLEX_FLOAT, BITS_PER_UNIT*24, 24, 12, TCmode)
 102 DEF_MACHMODE (TCmode, "TC", MODE_COMPLEX_FLOAT, BITS_PER_UNIT*32, 32, 16, VOIDmode)
 103
 104 DEF_MACHMODE (CQImode, "CQI", MODE_COMPLEX_INT, BITS_PER_UNIT*2, 2, 1, CHImode)
 105 DEF_MACHMODE (CHImode, "CHI", MODE_COMPLEX_INT, BITS_PER_UNIT*4, 4, 2, CSImode)
 106 DEF_MACHMODE (CSImode, "CSI", MODE_COMPLEX_INT, BITS_PER_UNIT*8, 8, 4, CDImode)
 107 DEF_MACHMODE (CDImode, "CDI", MODE_COMPLEX_INT, BITS_PER_UNIT*16, 16, 8, CTImode)
 108 DEF_MACHMODE (CTImode, "CTI", MODE_COMPLEX_INT, BITS_PER_UNIT*32, 32, 16, COImode)
 109 DEF_MACHMODE (COImode, "COI", MODE_COMPLEX_INT, BITS_PER_UNIT*64, 64, 32, VOIDmode)
 110
 111 /* Vector modes.  */
 112 /* There are no V1xx vector modes.  These are equivalent to normal
 113    scalar modes.  */
 114 /* The wider mode field for vectors follows in order of increasing bit
 115    size with QI coming before HI, HI before SI, and SI before DI
 116    within same bit sizes.  */
 117 DEF_MACHMODE (V2QImode, "V2QI", MODE_VECTOR_INT, BITS_PER_UNIT*2, 2, 1, V4QImode)
 118 DEF_MACHMODE (V2HImode, "V2HI", MODE_VECTOR_INT, BITS_PER_UNIT*4, 4, 2, V8QImode)
 119 DEF_MACHMODE (V2SImode, "V2SI", MODE_VECTOR_INT, BITS_PER_UNIT*8, 8, 4, V16QImode)
 120 DEF_MACHMODE (V2DImode, "V2DI", MODE_VECTOR_INT, BITS_PER_UNIT*16, 16, 8, V8SImode)
 121
 122 DEF_MACHMODE (V4QImode, "V4QI", MODE_VECTOR_INT, BITS_PER_UNIT*4, 4, 1, V2HImode)
 123 DEF_MACHMODE (V4HImode, "V4HI", MODE_VECTOR_INT, BITS_PER_UNIT*8, 8, 2, V2SImode)
 124 DEF_MACHMODE (V4SImode, "V4SI", MODE_VECTOR_INT, BITS_PER_UNIT*16, 16, 4, V2DImode)
 125 DEF_MACHMODE (V4DImode, "V4DI", MODE_VECTOR_INT, BITS_PER_UNIT*32, 32, 8, V8DImode)
 126
 127 DEF_MACHMODE (V8QImode, "V8QI", MODE_VECTOR_INT, BITS_PER_UNIT*8, 8, 1, V4HImode)
 128 DEF_MACHMODE (V8HImode, "V8HI", MODE_VECTOR_INT, BITS_PER_UNIT*16, 16, 2, V4SImode)
 129 DEF_MACHMODE (V8SImode, "V8SI", MODE_VECTOR_INT, BITS_PER_UNIT*32, 32, 4, V4DImode)
 130 DEF_MACHMODE (V8DImode, "V8DI", MODE_VECTOR_INT, BITS_PER_UNIT*64, 64, 8, VOIDmode)
 131
 132 DEF_MACHMODE (V16QImode, "V16QI", MODE_VECTOR_INT, BITS_PER_UNIT*16, 16, 1, V8HImode)
 133
 134 DEF_MACHMODE (V2SFmode, "V2SF", MODE_VECTOR_FLOAT, BITS_PER_UNIT*8, 8, 4, V4SFmode)
 135 DEF_MACHMODE (V2DFmode, "V2DF", MODE_VECTOR_FLOAT, BITS_PER_UNIT*16, 16, 8, V8SFmode)
 136
 137 DEF_MACHMODE (V4SFmode, "V4SF", MODE_VECTOR_FLOAT, BITS_PER_UNIT*16, 16, 4, V2DFmode)
 138 DEF_MACHMODE (V4DFmode, "V4DF", MODE_VECTOR_FLOAT, BITS_PER_UNIT*32, 32, 8, V8DFmode)
 139
 140 DEF_MACHMODE (V8SFmode, "V8SF", MODE_VECTOR_FLOAT, BITS_PER_UNIT*32, 32, 4,V4DFmode)
 141 DEF_MACHMODE (V8DFmode, "V8DF", MODE_VECTOR_FLOAT, BITS_PER_UNIT*64, 64, 8, VOIDmode)
 142
 143 /* BLKmode is used for structures, arrays, etc.
 144    that fit no more specific mode.  */
 145 DEF_MACHMODE (BLKmode, "BLK", MODE_RANDOM, 0, 0, 0, VOIDmode)
 146
 147 /* The modes for representing the condition codes come last.  CCmode
 148    is always defined.  Additional modes for the condition code can be
 149    specified in the EXTRA_CC_MODES macro.  All MODE_CC modes are the
 150    same width as SImode and have VOIDmode as their next wider mode.  */
 151
 152 #define CC(E, M)  DEF_MACHMODE (E, M, MODE_CC, BITS_PER_UNIT*4, 4, 4, VOIDmode)
 153
 154 CC (CCmode, "CC")
 155
 156 #ifdef EXTRA_CC_MODES
 157 EXTRA_CC_MODES
 158 #endif
 159
 160 #undef CC
 161
 162 /* The symbol Pmode stands for one of the above machine modes (usually SImode).
 163    The tm file specifies which one.  It is not a distinct mode.  Nevertheless,
 164    while processing the md file, we wish to treat as a distinct mode so that
 165    it is preserved intact through to the insn-foo.c files.  This eliminates a
 166    lot of redundancy in ports that support both 32-bit and 64-bit targets.  */
 167 #ifdef GENERATOR_FILE
 168 #undef Pmode
 169 DEF_MACHMODE (Pmode, "P", MODE_RANDOM, 0, 0, 0, VOIDmode)
 170 #endif
 171
 172 /*
 173 Local variables:
 174 mode:c
 175 version-control: t
 176 End:
 177 */