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1.1 root 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, VOIDmode)
75:
76: DEF_MACHMODE (SFmode, "SF", MODE_FLOAT, 4, 4, DFmode)
77: DEF_MACHMODE (DFmode, "DF", MODE_FLOAT, 8, 8, XFmode)
78: DEF_MACHMODE (XFmode, "XF", MODE_FLOAT, 12, 12, TFmode) /* IEEE extended */
79: DEF_MACHMODE (TFmode, "TF", MODE_FLOAT, 16, 16, VOIDmode)
80:
81: DEF_MACHMODE (SCmode, "SC", MODE_COMPLEX_FLOAT, 8, 4, DCmode)
82: DEF_MACHMODE (DCmode, "DC", MODE_COMPLEX_FLOAT, 16, 8, XCmode)
83: DEF_MACHMODE (XCmode, "XC", MODE_COMPLEX_FLOAT, 24, 12, TCmode)
84: DEF_MACHMODE (TCmode, "TC", MODE_COMPLEX_FLOAT, 32, 16, VOIDmode)
85:
86: /* BLKmode is used for structures, arrays, etc.
87: that fit no more specific mode. */
88: DEF_MACHMODE (BLKmode, "BLK", MODE_RANDOM, 0, 0, VOIDmode)
89:
90: /* The modes for representing the condition codes come last. CCmode is
91: always defined. Additional modes for the condition code can be specified
92: in the EXTRA_CC_MODES macro. Everything but the names of the modes
93: are copied from CCmode. For these modes, GET_MODE_WIDER_MODE points
94: to the next defined CC mode, if any. */
95:
96: DEF_MACHMODE (CCmode, "CC", MODE_CC, 4, 4, VOIDmode)
97:
98: /* The symbol Pmode stands for one of the above machine modes (usually SImode).
99: The tm file specifies which one. It is not a distinct mode. */
100:
101: /*
102: Local variables:
103: mode:c
104: version-control: t
105: End:
106: */
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