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1.1 root 1: /* Machine mode definitions for GNU C-Compiler; included by rtl.h and tree.h.
2: Copyright (C) 1991 Free Software Foundation, Inc.
3:
4: This file is part of GNU CC.
5:
6: GNU CC is free software; you can redistribute it and/or modify
7: it under the terms of the GNU General Public License as published by
8: the Free Software Foundation; either version 2, or (at your option)
9: any later version.
10:
11: GNU CC is distributed in the hope that it will be useful,
12: but WITHOUT ANY WARRANTY; without even the implied warranty of
13: MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14: GNU General Public License for more details.
15:
16: You should have received a copy of the GNU General Public License
17: along with GNU CC; see the file COPYING. If not, write to
18: the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA. */
19:
20:
21: #ifndef HAVE_MACHINE_MODES
22:
23: /* Strictly speaking, this isn't the proper place to include these definitions,
24: but this file is included by every GCC file.
25:
26: Some systems define these in, e.g., param.h. We undefine these names
27: here to avoid the warnings. We prefer to use our definitions since we
28: know they are correct. */
29:
30: #undef MIN
31: #undef MAX
32:
33: #define MIN(X,Y) ((X) < (Y) ? (X) : (Y))
34: #define MAX(X,Y) ((X) > (Y) ? (X) : (Y))
35:
1.1.1.3 ! root 36: /* Find the largest host integer type and set its size and type. */
! 37:
! 38: #ifndef HOST_BITS_PER_WIDE_INT
! 39:
! 40: #if HOST_BITS_PER_LONG > HOST_BITS_PER_INT
! 41: #define HOST_BITS_PER_WIDE_INT HOST_BITS_PER_LONG
! 42: #define HOST_WIDE_INT long
! 43: #else
! 44: #define HOST_BITS_PER_WIDE_INT HOST_BITS_PER_INT
! 45: #define HOST_WIDE_INT int
! 46: #endif
! 47:
! 48: #endif
! 49:
! 50: /* Define the number of entries in an 8-bit `shorts' array needed to represent
! 51: the largest supported constant, which is twice the width of the largest
! 52: host integer type. */
! 53:
! 54: #ifndef MAX_SHORTS
! 55: #define MAX_SHORTS (HOST_BITS_PER_WIDE_INT * 2 / 8)
! 56: #endif
! 57:
! 58: /* Provide a default way to print an address in hex via printf. */
! 59:
! 60: #ifndef HOST_PTR_PRINTF
! 61: #define HOST_PTR_PRINTF sizeof (int) == sizeof (char *) ? "%x" : "%lx"
! 62: #endif
! 63:
1.1 root 64: /* Make an enum class that gives all the machine modes. */
65:
66: #define DEF_MACHMODE(SYM, NAME, TYPE, SIZE, UNIT, WIDER) SYM,
67:
68: enum machine_mode {
69: #include "machmode.def"
70:
71: #ifdef EXTRA_CC_MODES
72: EXTRA_CC_MODES,
73: #endif
74: MAX_MACHINE_MODE };
75:
76: #undef DEF_MACHMODE
77:
78: #define HAVE_MACHINE_MODES
79:
80: #ifndef NUM_MACHINE_MODES
81: #define NUM_MACHINE_MODES (int) MAX_MACHINE_MODE
82: #endif
83:
84: /* Get the name of mode MODE as a string. */
85:
86: extern char *mode_name[];
87: #define GET_MODE_NAME(MODE) (mode_name[(int)(MODE)])
88:
89: enum mode_class { MODE_RANDOM, MODE_INT, MODE_FLOAT, MODE_PARTIAL_INT, MODE_CC,
90: MODE_COMPLEX_INT, MODE_COMPLEX_FLOAT, MAX_MODE_CLASS};
91:
92: /* Get the general kind of object that mode MODE represents
93: (integer, floating, complex, etc.) */
94:
95: extern enum mode_class mode_class[];
96: #define GET_MODE_CLASS(MODE) (mode_class[(int)(MODE)])
97:
98: /* Get the size in bytes of an object of mode MODE. */
99:
100: extern int mode_size[];
101: #define GET_MODE_SIZE(MODE) (mode_size[(int)(MODE)])
102:
103: /* Get the size in bytes of the basic parts of an object of mode MODE. */
104:
105: extern int mode_unit_size[];
106: #define GET_MODE_UNIT_SIZE(MODE) (mode_unit_size[(int)(MODE)])
107:
108: /* Get the number of units in the object. */
109:
110: #define GET_MODE_NUNITS(MODE) \
1.1.1.3 ! root 111: ((GET_MODE_UNIT_SIZE ((MODE)) == 0) ? 0 \
! 112: : (GET_MODE_SIZE ((MODE)) / GET_MODE_UNIT_SIZE ((MODE))))
1.1 root 113:
114: /* Get the size in bits of an object of mode MODE. */
115:
116: #define GET_MODE_BITSIZE(MODE) (BITS_PER_UNIT * mode_size[(int)(MODE)])
117:
118: /* Get a bitmask containing 1 for all bits in a word
119: that fit within mode MODE. */
120:
121: #define GET_MODE_MASK(MODE) \
1.1.1.3 ! root 122: ((GET_MODE_BITSIZE (MODE) >= HOST_BITS_PER_WIDE_INT) \
! 123: ?(HOST_WIDE_INT) ~0 : (((HOST_WIDE_INT) 1 << GET_MODE_BITSIZE (MODE)) - 1))
1.1 root 124:
125: /* Get the next wider natural mode (eg, QI -> HI -> SI -> DI -> TI). */
126:
127: extern enum machine_mode mode_wider_mode[];
128: #define GET_MODE_WIDER_MODE(MODE) (mode_wider_mode[(int)(MODE)])
129:
1.1.1.2 root 130: /* Return the mode for data of a given size SIZE and mode class CLASS.
131: If LIMIT is nonzero, then don't use modes bigger than MAX_FIXED_MODE_SIZE.
132: The value is BLKmode if no other mode is found. */
133:
134: extern enum machine_mode mode_for_size ();
135:
1.1 root 136: /* Find the best mode to use to access a bit field. */
137:
138: extern enum machine_mode get_best_mode ();
139:
140: /* Determine alignment, 1<=result<=BIGGEST_ALIGNMENT. */
141:
142: #define GET_MODE_ALIGNMENT(MODE) \
143: MIN (BIGGEST_ALIGNMENT, \
144: MAX (1, (GET_MODE_UNIT_SIZE (MODE) * BITS_PER_UNIT)))
145:
146: /* For each class, get the narrowest mode in that class. */
147:
148: extern enum machine_mode class_narrowest_mode[];
149: #define GET_CLASS_NARROWEST_MODE(CLASS) class_narrowest_mode[(int)(CLASS)]
150:
151: /* Define the integer modes whose sizes are BITS_PER_UNIT
152: and BITS_PER_WORD. */
153:
154: extern enum machine_mode byte_mode;
155: extern enum machine_mode word_mode;
156:
157: #endif /* not HAVE_MACHINE_MODES */
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