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 Free Software Foundation, Inc.
   4
   5 This file is part of GNU CC.
   6
   7 GNU CC is free software; you can redistribute it and/or modify
   8 it under the terms of the GNU General Public License as published by
   9 the Free Software Foundation; either version 2, or (at your option)
  10 any later version.
  11
  12 GNU CC is distributed in the hope that it will be useful,
  13 but WITHOUT ANY WARRANTY; without even the implied warranty of
  14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15 GNU General Public License for more details.
  16
  17 You should have received a copy of the GNU General Public License
  18 along with GNU CC; see the file COPYING.  If not, write to
  19 the Free Software Foundation, 59 Temple Place - Suite 330,
  20 Boston, MA 02111-1307, USA.  */
  21
  22
  23 /* This file defines all the MACHINE MODES used by GNU CC.
  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_RANDOM - anything else
  49
  50    Fourth argument is the relative size of the object, in bytes.
  51    It is zero when the size is meaningless or not determined.
  52    A byte's size is determined by BITS_PER_UNIT in tm.h.
  53
  54
  55    Fifth arg is the relative size of subunits of the object.
  56    It is same as the fourth argument except for complexes,
  57    since they are really made of two equal size subunits.
  58
  59    Sixth arg is next wider natural mode of the same class.
  60    0 if there is none.  */
  61
  62 /* VOIDmode is used when no mode needs to be specified,
  63    as for example on CONST_INT RTL expressions.  */
  64 DEF_MACHMODE (VOIDmode, "VOID", MODE_RANDOM, 0, 0, VOIDmode)
  65
  66 DEF_MACHMODE (PQImode, "PQI", MODE_PARTIAL_INT, 1, 1, PHImode)
  67 DEF_MACHMODE (QImode, "QI", MODE_INT, 1, 1, HImode)             /* int types */
  68 DEF_MACHMODE (PHImode, "PHI", MODE_PARTIAL_INT, 2, 2, PSImode)
  69 DEF_MACHMODE (HImode, "HI", MODE_INT, 2, 2, SImode)
  70 /* Pointers on some machines use this type to distinguish them from ints.
  71    Useful if a pointer is 4 bytes but has some bits that are not significant,
  72    so it is really not quite as wide as an integer.  */
  73 DEF_MACHMODE (PSImode, "PSI", MODE_PARTIAL_INT, 4, 4, PDImode)
  74 DEF_MACHMODE (SImode, "SI", MODE_INT, 4, 4, DImode)
  75 DEF_MACHMODE (PDImode, "PDI", MODE_PARTIAL_INT, 8, 8, VOIDmode)
  76 DEF_MACHMODE (DImode, "DI", MODE_INT, 8, 8, TImode)
  77 DEF_MACHMODE (TImode, "TI", MODE_INT, 16, 16, OImode)
  78 DEF_MACHMODE (OImode, "OI", MODE_INT, 32, 32, VOIDmode)
  79
  80 DEF_MACHMODE (QFmode, "QF", MODE_FLOAT, 1, 1, HFmode)
  81 DEF_MACHMODE (HFmode, "HF", MODE_FLOAT, 2, 2, TQFmode)
  82 DEF_MACHMODE (TQFmode, "TQF", MODE_FLOAT, 3, 3, SFmode)  /* MIL-STD-1750A */
  83 DEF_MACHMODE (SFmode, "SF", MODE_FLOAT, 4, 4, DFmode)
  84 DEF_MACHMODE (DFmode, "DF", MODE_FLOAT, 8, 8, XFmode)
  85 DEF_MACHMODE (XFmode, "XF", MODE_FLOAT, 12, 12, TFmode)   /* IEEE extended */
  86 DEF_MACHMODE (TFmode, "TF", MODE_FLOAT, 16, 16, VOIDmode)
  87
  88 /* Complex modes.  */
  89 DEF_MACHMODE (QCmode, "QC", MODE_COMPLEX_FLOAT, 2, 1, HCmode)
  90 DEF_MACHMODE (HCmode, "HC", MODE_COMPLEX_FLOAT, 4, 2, SCmode)
  91 DEF_MACHMODE (SCmode, "SC", MODE_COMPLEX_FLOAT, 8, 4, DCmode)
  92 DEF_MACHMODE (DCmode, "DC", MODE_COMPLEX_FLOAT, 16, 8, XCmode)
  93 DEF_MACHMODE (XCmode, "XC", MODE_COMPLEX_FLOAT, 24, 12, TCmode)
  94 DEF_MACHMODE (TCmode, "TC", MODE_COMPLEX_FLOAT, 32, 16, VOIDmode)
  95
  96 DEF_MACHMODE (CQImode, "CQI", MODE_COMPLEX_INT, 2, 1, CHImode)
  97 DEF_MACHMODE (CHImode, "CHI", MODE_COMPLEX_INT, 4, 2, CSImode)
  98 DEF_MACHMODE (CSImode, "CSI", MODE_COMPLEX_INT, 8, 4, CDImode)
  99 DEF_MACHMODE (CDImode, "CDI", MODE_COMPLEX_INT, 16, 8, CTImode)
 100 DEF_MACHMODE (CTImode, "CTI", MODE_COMPLEX_INT, 32, 16, COImode)
 101 DEF_MACHMODE (COImode, "COI", MODE_COMPLEX_INT, 64, 32, VOIDmode)
 102
 103 /* BLKmode is used for structures, arrays, etc.
 104    that fit no more specific mode.  */
 105 DEF_MACHMODE (BLKmode, "BLK", MODE_RANDOM, 0, 0, VOIDmode)
 106
 107 /* The modes for representing the condition codes come last.  CCmode is
 108    always defined.  Additional modes for the condition code can be specified
 109    in the EXTRA_CC_MODES macro.
 110    All MODE_CC modes are the same width as SImode and have VOIDmode as their
 111    next wider mode.
 112 */
 113
 114 #define CC(E, M)  DEF_MACHMODE (E, M, MODE_CC, 4, 4, VOIDmode)
 115
 116 CC (CCmode, "CC")
 117
 118 #ifdef EXTRA_CC_MODES
 119 EXTRA_CC_MODES
 120 #endif
 121
 122 #undef CC
 123
 124 /* The symbol Pmode stands for one of the above machine modes (usually SImode).
 125    The tm file specifies which one.  It is not a distinct mode.  */
 126
 127 /*
 128 Local variables:
 129 mode:c
 130 version-control: t
 131 End:
 132 */