[8833] | 1 | /* This file contains the definitions and documentation for the |
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| 2 | machine modes used in the the GNU compiler. |
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| 3 | Copyright (C) 1987, 1992, 1994 Free Software Foundation, Inc. |
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| 4 | |
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| 5 | This file is part of GNU CC. |
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| 6 | |
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| 7 | GNU CC is free software; you can redistribute it and/or modify |
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| 8 | it under the terms of the GNU General Public License as published by |
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| 9 | the Free Software Foundation; either version 2, or (at your option) |
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| 10 | any later version. |
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| 11 | |
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| 12 | GNU CC is distributed in the hope that it will be useful, |
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| 13 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
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| 14 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
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| 15 | GNU General Public License for more details. |
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| 16 | |
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| 17 | You should have received a copy of the GNU General Public License |
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| 18 | along with GNU CC; see the file COPYING. If not, write to |
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| 19 | the Free Software Foundation, 59 Temple Place - Suite 330, |
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| 20 | Boston, MA 02111-1307, USA. */ |
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| 21 | |
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| 22 | |
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| 23 | /* This file defines all the MACHINE MODES used by GNU CC. |
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| 24 | |
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| 25 | A machine mode specifies a size and format of data |
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| 26 | at the machine level. |
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| 27 | |
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| 28 | Each RTL expression has a machine mode. |
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| 29 | |
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| 30 | At the syntax tree level, each ..._TYPE and each ..._DECL node |
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| 31 | has a machine mode which describes data of that type or the |
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| 32 | data of the variable declared. */ |
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| 33 | |
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| 34 | /* The first argument is the internal name of the machine mode |
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| 35 | used in the C source. |
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| 36 | By convention these are in UPPER_CASE, except for the word "mode". |
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| 37 | |
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| 38 | The second argument is the name of the machine mode in the |
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| 39 | external ASCII format used for reading and printing RTL and trees. |
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| 40 | By convention these names in UPPER_CASE. |
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| 41 | |
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| 42 | Third argument states the kind of representation: |
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| 43 | MODE_INT - integer |
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| 44 | MODE_FLOAT - floating |
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| 45 | MODE_PARTIAL_INT - PSImode and PDImode |
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| 46 | MODE_CC - modes used for representing the condition code in a register |
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| 47 | MODE_COMPLEX_INT, MODE_COMPLEX_FLOAT - complex number |
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| 48 | MODE_RANDOM - anything else |
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| 49 | |
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| 50 | Fourth argument is the relative size of the object, in bytes. |
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| 51 | It is zero when the size is meaningless or not determined. |
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| 52 | A byte's size is determined by BITS_PER_UNIT in tm.h. |
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| 53 | |
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| 54 | |
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| 55 | Fifth arg is the relative size of subunits of the object. |
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| 56 | It is same as the fourth argument except for complexes, |
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| 57 | since they are really made of two equal size subunits. |
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| 58 | |
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| 59 | Sixth arg is next wider natural mode of the same class. |
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| 60 | 0 if there is none. */ |
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| 61 | |
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| 62 | /* VOIDmode is used when no mode needs to be specified, |
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| 63 | as for example on CONST_INT RTL expressions. */ |
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| 64 | DEF_MACHMODE (VOIDmode, "VOID", MODE_RANDOM, 0, 0, VOIDmode) |
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| 65 | |
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| 66 | DEF_MACHMODE (QImode, "QI", MODE_INT, 1, 1, HImode) /* int types */ |
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| 67 | DEF_MACHMODE (HImode, "HI", MODE_INT, 2, 2, SImode) |
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| 68 | /* Pointers on some machines use this type to distinguish them from ints. |
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| 69 | Useful if a pointer is 4 bytes but has some bits that are not significant, |
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| 70 | so it is really not quite as wide as an integer. */ |
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| 71 | DEF_MACHMODE (PSImode, "PSI", MODE_PARTIAL_INT, 4, 4, PDImode) |
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| 72 | DEF_MACHMODE (SImode, "SI", MODE_INT, 4, 4, DImode) |
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| 73 | DEF_MACHMODE (PDImode, "PDI", MODE_PARTIAL_INT, 8, 8, VOIDmode) |
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| 74 | DEF_MACHMODE (DImode, "DI", MODE_INT, 8, 8, TImode) |
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| 75 | DEF_MACHMODE (TImode, "TI", MODE_INT, 16, 16, OImode) |
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| 76 | DEF_MACHMODE (OImode, "OI", MODE_INT, 32, 32, VOIDmode) |
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| 77 | |
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| 78 | DEF_MACHMODE (QFmode, "QF", MODE_FLOAT, 1, 1, HFmode) |
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| 79 | DEF_MACHMODE (HFmode, "HF", MODE_FLOAT, 2, 2, TQFmode) |
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| 80 | DEF_MACHMODE (TQFmode, "TQF", MODE_FLOAT, 3, 3, SFmode) /* MIL-STD-1750A */ |
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| 81 | DEF_MACHMODE (SFmode, "SF", MODE_FLOAT, 4, 4, DFmode) |
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| 82 | DEF_MACHMODE (DFmode, "DF", MODE_FLOAT, 8, 8, XFmode) |
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| 83 | DEF_MACHMODE (XFmode, "XF", MODE_FLOAT, 12, 12, TFmode) /* IEEE extended */ |
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| 84 | DEF_MACHMODE (TFmode, "TF", MODE_FLOAT, 16, 16, VOIDmode) |
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| 85 | |
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| 86 | /* Complex modes. */ |
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| 87 | DEF_MACHMODE (SCmode, "SC", MODE_COMPLEX_FLOAT, 8, 4, DCmode) |
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| 88 | DEF_MACHMODE (DCmode, "DC", MODE_COMPLEX_FLOAT, 16, 8, XCmode) |
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| 89 | DEF_MACHMODE (XCmode, "XC", MODE_COMPLEX_FLOAT, 24, 12, TCmode) |
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| 90 | DEF_MACHMODE (TCmode, "TC", MODE_COMPLEX_FLOAT, 32, 16, VOIDmode) |
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| 91 | |
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| 92 | DEF_MACHMODE (CQImode, "CQI", MODE_COMPLEX_INT, 2, 1, CHImode) |
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| 93 | DEF_MACHMODE (CHImode, "CHI", MODE_COMPLEX_INT, 4, 2, CSImode) |
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| 94 | DEF_MACHMODE (CSImode, "CSI", MODE_COMPLEX_INT, 8, 4, CDImode) |
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| 95 | DEF_MACHMODE (CDImode, "CDI", MODE_COMPLEX_INT, 16, 8, CTImode) |
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| 96 | DEF_MACHMODE (CTImode, "CTI", MODE_COMPLEX_INT, 32, 16, COImode) |
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| 97 | DEF_MACHMODE (COImode, "COI", MODE_COMPLEX_INT, 64, 32, VOIDmode) |
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| 98 | |
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| 99 | /* BLKmode is used for structures, arrays, etc. |
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| 100 | that fit no more specific mode. */ |
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| 101 | DEF_MACHMODE (BLKmode, "BLK", MODE_RANDOM, 0, 0, VOIDmode) |
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| 102 | |
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| 103 | /* The modes for representing the condition codes come last. CCmode is |
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| 104 | always defined. Additional modes for the condition code can be specified |
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| 105 | in the EXTRA_CC_MODES macro. Everything but the names of the modes |
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| 106 | are copied from CCmode. For these modes, GET_MODE_WIDER_MODE points |
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| 107 | to the next defined CC mode, if any. */ |
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| 108 | |
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| 109 | DEF_MACHMODE (CCmode, "CC", MODE_CC, 4, 4, VOIDmode) |
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| 110 | |
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| 111 | /* The symbol Pmode stands for one of the above machine modes (usually SImode). |
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| 112 | The tm file specifies which one. It is not a distinct mode. */ |
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| 113 | |
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| 114 | /* |
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| 115 | Local variables: |
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| 116 | mode:c |
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| 117 | version-control: t |
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| 118 | End: |
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| 119 | */ |
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