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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) \ | |
161ca48c RS |
131 | (GET_MODE_BITSIZE (mode) == sizeof (float) * HOST_BITS_PER_CHAR \ |
132 | ? (float) (x) : (x)) | |
0694b47c RS |
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 | ||
3dd4b517 TW |
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 | ||
0694b47c RS |
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 | \f | |
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 */ |