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1 | /* This file contains the definitions and documentation for the |
2 | machine modes used in the the GNU compiler. | |
3 | Copyright (C) 1987-1990 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, 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_PARTIAL_INT - PSImode and PDImode | |
45 | MODE_CC - modes used for representing the condition code in a register | |
46 | MODE_COMPLEX_INT, MODE_COMPLEX_FLOAT - complex number | |
47 | MODE_RANDOM - anything else | |
48 | ||
49 | Fourth argument is the relative size of the object, in bytes. | |
50 | It is zero when the size is meaningless or not determined. | |
51 | A byte's size is determined by BITS_PER_UNIT in tm.h. | |
52 | ||
53 | ||
54 | Fifth arg is the relative size of subunits of the object. | |
55 | It is same as the fourth argument except for complexes, | |
56 | since they are really made of two equal size subunits. | |
57 | ||
58 | Sixth arg is next wider natural mode of the same class. | |
59 | 0 if there is none. */ | |
60 | ||
61 | /* VOIDmode is used when no mode needs to be specified, | |
62 | as for example on CONST_INT RTL expressions. */ | |
63 | DEF_MACHMODE (VOIDmode, "VOID", MODE_RANDOM, 0, 0, VOIDmode) | |
64 | ||
65 | DEF_MACHMODE (QImode, "QI", MODE_INT, 1, 1, HImode) /* int types */ | |
66 | DEF_MACHMODE (HImode, "HI", MODE_INT, 2, 2, SImode) | |
67 | /* Pointers on some machines use this type to distinguish them from ints. | |
68 | Useful if a pointer is 4 bytes but has some bits that are not significant, | |
69 | so it is really not quite as wide as an integer. */ | |
70 | DEF_MACHMODE (PSImode, "PSI", MODE_PARTIAL_INT, 4, 4, VOIDmode) | |
71 | DEF_MACHMODE (SImode, "SI", MODE_INT, 4, 4, DImode) | |
72 | DEF_MACHMODE (PDImode, "PDI", MODE_PARTIAL_INT, 8, 8, VOIDmode) | |
73 | DEF_MACHMODE (DImode, "DI", MODE_INT, 8, 8, TImode) | |
74 | DEF_MACHMODE (TImode, "TI", MODE_INT, 16, 16, OImode) | |
75 | DEF_MACHMODE (OImode, "OI", MODE_INT, 32, 32, VOIDmode) | |
76 | ||
77 | DEF_MACHMODE (QFmode, "QF", MODE_FLOAT, 1, 1, HFmode) | |
78 | DEF_MACHMODE (HFmode, "HF", MODE_FLOAT, 2, 2, SFmode) | |
79 | DEF_MACHMODE (SFmode, "SF", MODE_FLOAT, 4, 4, DFmode) | |
80 | DEF_MACHMODE (DFmode, "DF", MODE_FLOAT, 8, 8, XFmode) | |
81 | DEF_MACHMODE (XFmode, "XF", MODE_FLOAT, 12, 12, TFmode) /* IEEE extended */ | |
82 | DEF_MACHMODE (TFmode, "TF", MODE_FLOAT, 16, 16, VOIDmode) | |
83 | ||
84 | /* Complex modes. */ | |
85 | DEF_MACHMODE (SCmode, "SC", MODE_COMPLEX_FLOAT, 8, 4, DCmode) | |
86 | DEF_MACHMODE (DCmode, "DC", MODE_COMPLEX_FLOAT, 16, 8, XCmode) | |
87 | DEF_MACHMODE (XCmode, "XC", MODE_COMPLEX_FLOAT, 24, 12, TCmode) | |
88 | DEF_MACHMODE (TCmode, "TC", MODE_COMPLEX_FLOAT, 32, 16, VOIDmode) | |
89 | ||
90 | DEF_MACHMODE (CQImode, "CQI", MODE_COMPLEX_INT, 2, 1, CHImode) | |
91 | DEF_MACHMODE (CHImode, "CHI", MODE_COMPLEX_INT, 4, 2, CSImode) | |
92 | DEF_MACHMODE (CSImode, "CSI", MODE_COMPLEX_INT, 8, 4, CDImode) | |
93 | DEF_MACHMODE (CDImode, "CDI", MODE_COMPLEX_INT, 16, 8, CTImode) | |
94 | DEF_MACHMODE (CTImode, "CTI", MODE_COMPLEX_INT, 32, 16, COImode) | |
95 | DEF_MACHMODE (COImode, "COI", MODE_COMPLEX_INT, 64, 32, VOIDmode) | |
96 | ||
97 | /* BLKmode is used for structures, arrays, etc. | |
98 | that fit no more specific mode. */ | |
99 | DEF_MACHMODE (BLKmode, "BLK", MODE_RANDOM, 0, 0, VOIDmode) | |
100 | ||
101 | /* The modes for representing the condition codes come last. CCmode is | |
102 | always defined. Additional modes for the condition code can be specified | |
103 | in the EXTRA_CC_MODES macro. Everything but the names of the modes | |
104 | are copied from CCmode. For these modes, GET_MODE_WIDER_MODE points | |
105 | to the next defined CC mode, if any. */ | |
106 | ||
107 | DEF_MACHMODE (CCmode, "CC", MODE_CC, 4, 4, VOIDmode) | |
108 | ||
109 | /* The symbol Pmode stands for one of the above machine modes (usually SImode). | |
110 | The tm file specifies which one. It is not a distinct mode. */ | |
111 | ||
112 | /* | |
113 | Local variables: | |
114 | mode:c | |
115 | version-control: t | |
116 | End: | |
117 | */ |