| 1 | /* This file contains the definitions and documentation for the |
| 2 | machine modes used in the the GNU compiler. |
| 3 | Copyright (C) 1987 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 1, 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, 675 Mass Ave, Cambridge, MA 02139, USA. */ |
| 20 | |
| 21 | |
| 22 | /* This file defines all the MACHINE MODES used by GNU CC. |
| 23 | |
| 24 | A machine mode specifies a size and format of data |
| 25 | at the machine level. |
| 26 | |
| 27 | Each RTL expression has a machine mode. |
| 28 | |
| 29 | At the syntax tree level, each ..._TYPE and each ..._DECL node |
| 30 | has a machine mode which describes data of that type or the |
| 31 | data of the variable declared. */ |
| 32 | |
| 33 | /* The first argument is the internal name of the machine mode |
| 34 | used in the C source. |
| 35 | By convention these are in UPPER_CASE, except for the word "mode". |
| 36 | |
| 37 | The second argument is the name of the machine mode in the |
| 38 | external ASCII format used for reading and printing RTL and trees. |
| 39 | By convention these names in UPPER_CASE. |
| 40 | |
| 41 | Third argument states the kind of representation: |
| 42 | MODE_INT - integer |
| 43 | MODE_FLOAT - floating |
| 44 | MODE_COMPLEX_INT - pair of integers |
| 45 | MODE_COMPLEX_FLOAT - pair of floats |
| 46 | MODE_FUNCTION - Algol or Pascal function-variable incl. static chain |
| 47 | MODE_RANDOM - anything else |
| 48 | |
| 49 | Fourth argument is the relative size of the object. |
| 50 | It is zero when the size is meaningless or not determined. |
| 51 | On most machines, this is also the actual size in bytes. |
| 52 | However, the general rule is that the size of SImode in bytes |
| 53 | is UNITS_PER_WORD and the other sizes are proportional to that. |
| 54 | (If UNITS_PER_WORD is less than 4, some modes would be less than |
| 55 | one byte. Their sizes are rounded up to 1.) |
| 56 | |
| 57 | Fifth arg is the relative size of subunits of the object. |
| 58 | It is same as the fourth argument except for complexes and EPmode, |
| 59 | since they are really made of two equal size subunits. |
| 60 | |
| 61 | Sixth arg is next wider natural mode of the same class, |
| 62 | for widening multiply and narrowing divide. 0 if there is none. */ |
| 63 | |
| 64 | /* The compiler assumes that a mode may be widened to another |
| 65 | HIGHER NUMBERED mode if both those modes AND ALL MODES IN BETWEEN |
| 66 | are in the same mode class. Thus, you must should assign all |
| 67 | MODE_INT and MODE_FLOAT modes in separate contiguous blocks. */ |
| 68 | |
| 69 | /* VOIDmode is used when no mode needs to be specified, |
| 70 | as for example on CONST_INT RTL expressions. */ |
| 71 | DEF_MACHMODE (VOIDmode, "VOID", MODE_RANDOM, 0, 0, 0) |
| 72 | |
| 73 | DEF_MACHMODE (QImode, "QI", MODE_INT, 1, 1, HImode) /* int types */ |
| 74 | DEF_MACHMODE (HImode, "HI", MODE_INT, 2, 2, SImode) |
| 75 | /* Pointers on some machines use this type to distinguish them from ints. |
| 76 | Useful if a pointer is 4 bytes but has some bits that are not significant, |
| 77 | so it is really not quite as wide as an integer. */ |
| 78 | DEF_MACHMODE (PSImode, "PSI", MODE_INT, 4, 4, 0) |
| 79 | DEF_MACHMODE (SImode, "SI", MODE_INT, 4, 4, DImode) |
| 80 | DEF_MACHMODE (PDImode, "PDI", MODE_INT, 8, 8, 0) |
| 81 | DEF_MACHMODE (DImode, "DI", MODE_INT, 8, 8, TImode) |
| 82 | DEF_MACHMODE (TImode, "TI", MODE_INT, 16, 16, 0) |
| 83 | DEF_MACHMODE (QFmode, "QF", MODE_FLOAT, 1, 1, 0) |
| 84 | DEF_MACHMODE (HFmode, "HF", MODE_FLOAT, 2, 2, 0) /* floating types */ |
| 85 | DEF_MACHMODE (SFmode, "SF", MODE_FLOAT, 4, 4, 0) |
| 86 | DEF_MACHMODE (DFmode, "DF", MODE_FLOAT, 8, 8, 0) |
| 87 | DEF_MACHMODE (XFmode, "XF", MODE_FLOAT, 12, 12, 0) /* IEEE extended float */ |
| 88 | DEF_MACHMODE (TFmode, "TF", MODE_FLOAT, 16, 16, 0) |
| 89 | DEF_MACHMODE (CQImode, "CQI", MODE_COMPLEX_INT, 2, 1, 0) |
| 90 | DEF_MACHMODE (CHImode, "CHI", MODE_COMPLEX_INT, 4, 2, 0) /* complex ints */ |
| 91 | DEF_MACHMODE (CSImode, "CSI", MODE_COMPLEX_INT, 8, 4, 0) |
| 92 | DEF_MACHMODE (CDImode, "CDI", MODE_COMPLEX_INT, 16, 8, 0) |
| 93 | DEF_MACHMODE (CTImode, "CTI", MODE_COMPLEX_INT, 32, 16, 0) |
| 94 | DEF_MACHMODE (CQFmode, "CQF", MODE_COMPLEX_FLOAT, 2, 1, 0) |
| 95 | DEF_MACHMODE (CHFmode, "CHF", MODE_COMPLEX_FLOAT, 4, 2, 0) /* complex floats */ |
| 96 | DEF_MACHMODE (CSFmode, "CSF", MODE_COMPLEX_FLOAT, 8, 4, 0) |
| 97 | DEF_MACHMODE (CDFmode, "CDF", MODE_COMPLEX_FLOAT, 16, 8, 0) |
| 98 | DEF_MACHMODE (CXFmode, "CXF", MODE_COMPLEX_FLOAT, 24, 12, 0) |
| 99 | DEF_MACHMODE (CTFmode, "CTF", MODE_COMPLEX_FLOAT, 32, 16, 0) |
| 100 | |
| 101 | /* BImode is used only in FIELD_DECL nodes for bit fields |
| 102 | whose size and alignment are not such as to fit any other mode. */ |
| 103 | DEF_MACHMODE (BImode, "BI", MODE_INT, 0, 0, 0) /* signed bit field */ |
| 104 | |
| 105 | /* BLKmode is used for structures, arrays, etc. |
| 106 | that fit no more specific mode. */ |
| 107 | DEF_MACHMODE (BLKmode, "BLK", MODE_RANDOM, 0, 0, 0) |
| 108 | |
| 109 | /* Function-variable that includes a static chain. */ |
| 110 | DEF_MACHMODE (EPmode, "EP", MODE_RANDOM, 8, 4, 0) |
| 111 | |
| 112 | /* The symbol Pmode stands for one of the above machine modes (usually SImode). |
| 113 | The tm file specifies which one. It is not a distinct mode. */ |
| 114 | |
| 115 | /* |
| 116 | Local variables: |
| 117 | mode:c |
| 118 | version-control: t |
| 119 | End: |
| 120 | */ |