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1.1 root 1: /* Front-end tree definitions for GNU compiler.
2: Copyright (C) 1989, 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: #ifndef REAL_H_INCLUDED
21: #define REAL_H_INCLUDED
22:
23: /* Define codes for all the float formats that we know of. */
24: #define UNKNOWN_FLOAT_FORMAT 0
25: #define IEEE_FLOAT_FORMAT 1
26: #define VAX_FLOAT_FORMAT 2
27:
28: /* Default to IEEE float if not specified. Nearly all machines use it. */
29:
30: #ifndef TARGET_FLOAT_FORMAT
31: #define TARGET_FLOAT_FORMAT IEEE_FLOAT_FORMAT
32: #endif
33:
34: #ifndef HOST_FLOAT_FORMAT
35: #define HOST_FLOAT_FORMAT IEEE_FLOAT_FORMAT
36: #endif
37:
38: #if TARGET_FLOAT_FORMAT == IEEE_FLOAT_FORMAT
39: #define REAL_INFINITY
40: #endif
41:
42: #ifdef REAL_ARITHMETIC
43: /* Defining REAL_IS_NOT_DOUBLE breaks certain initializations
44: when REAL_ARITHMETIC etc. are not defined. */
45:
46: /* Now see if the host and target machines use the same format.
47: If not, define REAL_IS_NOT_DOUBLE (even if we end up representing
48: reals as doubles because we have no better way in this cross compiler.)
49: This turns off various optimizations that can happen when we know the
50: compiler's float format matches the target's float format.
51: */
52: #if HOST_FLOAT_FORMAT != TARGET_FLOAT_FORMAT
53: #define REAL_IS_NOT_DOUBLE
54: #ifndef REAL_VALUE_TYPE
55: #define REAL_VALUE_TYPE \
56: struct real_value { long i[sizeof (double) / sizeof (long)]; }
57: #endif /* no REAL_VALUE_TYPE */
58: #endif /* formats differ */
59: #endif /* 0 */
60:
61: /* If we are not cross-compiling, use a `double' to represent the
62: floating-point value. Otherwise, use some other type
63: (probably a struct containing an array of longs). */
64: #ifndef REAL_VALUE_TYPE
65: #define REAL_VALUE_TYPE double
66: #else
67: #define REAL_IS_NOT_DOUBLE
68: #endif
69:
70: /* Compare two floating-point values for equality. */
71: #ifndef REAL_VALUES_EQUAL
72: #define REAL_VALUES_EQUAL(x,y) ((x) == (y))
73: #endif
74:
75: /* Compare two floating-point values for less than. */
76: #ifndef REAL_VALUES_LESS
77: #define REAL_VALUES_LESS(x,y) ((x) < (y))
78: #endif
79:
80: /* Convert a floating-point value to integer by truncating. */
81: #ifndef REAL_VALUE_FIX_TRUNCATE
82: #define REAL_VALUE_FIX_TRUNCATE(x) ((int) (x))
83: #endif
84:
85: /* Convert a floating-point value to unsigned integer by truncating. */
86: #ifndef REAL_VALUE_UNSIGNED_FIX_TRUNCATE
87: #define REAL_VALUE_UNSIGNED_FIX_TRUNCATE(x) ((unsigned int) (x))
88: #endif
89:
90: /* Convert a floating-point value to integer, using any rounding mode. */
91: #ifndef REAL_VALUE_FIX
92: #define REAL_VALUE_FIX(x) ((int) (x))
93: #endif
94:
95: /* Convert a floating-point value to unsigned integer, using any rounding
96: mode. */
97: #ifndef REAL_VALUE_UNSIGNED_FIX
98: #define REAL_VALUE_UNSIGNED_FIX(x) ((unsigned int) (x))
99: #endif
100:
101: /* Scale X by Y powers of 2. */
102: #ifndef REAL_VALUE_LDEXP
103: #define REAL_VALUE_LDEXP(x,y) ldexp (x, y)
104: extern double ldexp ();
105: #endif
106:
107: /* Convert the string X to a floating-point value. */
108: #ifndef REAL_VALUE_ATOF
109: #define REAL_VALUE_ATOF(x) atof (x)
110: #if defined (MIPSEL) || defined (MIPSEB)
111: /* MIPS compiler can't handle parens around the function name.
112: This problem *does not* appear to be connected with any
113: macro definition for atof. It does not seem there is one. */
114: extern double atof ();
115: #else
116: extern double (atof) ();
117: #endif
118: #endif
119:
120: /* Negate the floating-point value X. */
121: #ifndef REAL_VALUE_NEGATE
122: #define REAL_VALUE_NEGATE(x) (- (x))
123: #endif
124:
125: /* Truncate the floating-point value X to mode MODE. This is correct only
126: for the most common case where the host and target have objects of the same
127: size and where `float' is SFmode. */
128:
129: #ifndef REAL_VALUE_TRUNCATE
130: #define REAL_VALUE_TRUNCATE(mode, x) \
131: (GET_MODE_BITSIZE (mode) == sizeof (float) * HOST_BITS_PER_CHAR \
132: ? (float) (x) : (x))
133: #endif
134:
135: /* Determine whether a floating-point value X is infinite. */
136: #ifndef REAL_VALUE_ISINF
137: #define REAL_VALUE_ISINF(x) (target_isinf (x))
138: #endif
139:
1.1.1.2 ! root 140: /* Determine whether a floating-point value X is a NaN. */
! 141: #ifndef REAL_VALUE_ISNAN
! 142: #define REAL_VALUE_ISNAN(x) (target_isnan (x))
! 143: #endif
! 144:
1.1 root 145: /* Determine whether a floating-point value X is minus 0. */
146: #ifndef REAL_VALUE_MINUS_ZERO
147: #define REAL_VALUE_MINUS_ZERO(x) (target_minus_zero (x))
148: #endif
149:
150: /* Constant real values 0, 1, 2, and -1. */
151:
152: extern REAL_VALUE_TYPE dconst0;
153: extern REAL_VALUE_TYPE dconst1;
154: extern REAL_VALUE_TYPE dconst2;
155: extern REAL_VALUE_TYPE dconstm1;
156:
157: /* Union type used for extracting real values from CONST_DOUBLEs
158: or putting them in. */
159:
160: union real_extract
161: {
162: REAL_VALUE_TYPE d;
163: int i[sizeof (REAL_VALUE_TYPE) / sizeof (int)];
164: };
165:
166: /* For a CONST_DOUBLE:
167: The usual two ints that hold the value.
168: For a DImode, that is all there are;
169: and CONST_DOUBLE_LOW is the low-order word and ..._HIGH the high-order.
170: For a float, the number of ints varies,
171: and CONST_DOUBLE_LOW is the one that should come first *in memory*.
172: So use &CONST_DOUBLE_LOW(r) as the address of an array of ints. */
173: #define CONST_DOUBLE_LOW(r) XINT (r, 2)
174: #define CONST_DOUBLE_HIGH(r) XINT (r, 3)
175:
176: /* Link for chain of all CONST_DOUBLEs in use in current function. */
177: #define CONST_DOUBLE_CHAIN(r) XEXP (r, 1)
178: /* The MEM which represents this CONST_DOUBLE's value in memory,
179: or const0_rtx if no MEM has been made for it yet,
180: or cc0_rtx if it is not on the chain. */
181: #define CONST_DOUBLE_MEM(r) XEXP (r, 0)
182:
183: /* Function to return a real value (not a tree node)
184: from a given integer constant. */
185: REAL_VALUE_TYPE real_value_from_int_cst ();
186:
187: /* Given a CONST_DOUBLE in FROM, store into TO the value it represents. */
188:
189: #define REAL_VALUE_FROM_CONST_DOUBLE(to, from) \
190: do { union real_extract u; \
191: bcopy (&CONST_DOUBLE_LOW ((from)), &u, sizeof u); \
192: to = u.d; } while (0)
193:
194: /* Return a CONST_DOUBLE with value R and mode M. */
195:
196: #define CONST_DOUBLE_FROM_REAL_VALUE(r,m) immed_real_const_1 (r, m)
197:
198: #endif /* Not REAL_H_INCLUDED */
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