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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 \ | |
3245eea0 | 56 | struct real_value{ HOST_WIDE_INT i[sizeof (double)/sizeof (HOST_WIDE_INT)]; } |
0694b47c RS |
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 | ||
f9250555 RS |
70 | #if HOST_FLOAT_FORMAT == TARGET_FLOAT_FORMAT |
71 | ||
72 | /* Convert a type `double' value in host format first to a type `float' | |
73 | value in host format and then to a single type `long' value which | |
74 | is the bitwise equivalent of the `float' value. */ | |
75 | #define REAL_VALUE_TO_TARGET_SINGLE(IN, OUT) \ | |
76 | do { float f = (float) (IN); \ | |
77 | (OUT) = *(long *) &f; \ | |
78 | } while (0) | |
79 | ||
80 | /* Convert a type `double' value in host format to a pair of type `long' | |
81 | values which is its bitwise equivalent, but put the two words into | |
82 | proper word order for the target. */ | |
83 | #if defined (HOST_WORDS_BIG_ENDIAN) == WORDS_BIG_ENDIAN | |
84 | #define REAL_VALUE_TO_TARGET_DOUBLE(IN, OUT) \ | |
85 | do { REAL_VALUE_TYPE in = (IN); /* Make sure it's not in a register. */\ | |
86 | (OUT)[0] = ((long *) &in)[0]; \ | |
87 | (OUT)[1] = ((long *) &in)[1]; \ | |
88 | } while (0) | |
89 | #else | |
90 | #define REAL_VALUE_TO_TARGET_DOUBLE(IN, OUT) \ | |
91 | do { REAL_VALUE_TYPE in = (IN); /* Make sure it's not in a register. */\ | |
92 | (OUT)[1] = ((long *) &in)[0]; \ | |
93 | (OUT)[0] = ((long *) &in)[1]; \ | |
94 | } while (0) | |
95 | #endif | |
96 | #endif /* HOST_FLOAT_FORMAT == TARGET_FLOAT_FORMAT */ | |
97 | ||
0694b47c RS |
98 | /* Compare two floating-point values for equality. */ |
99 | #ifndef REAL_VALUES_EQUAL | |
100 | #define REAL_VALUES_EQUAL(x,y) ((x) == (y)) | |
101 | #endif | |
102 | ||
103 | /* Compare two floating-point values for less than. */ | |
104 | #ifndef REAL_VALUES_LESS | |
105 | #define REAL_VALUES_LESS(x,y) ((x) < (y)) | |
106 | #endif | |
107 | ||
108 | /* Convert a floating-point value to integer by truncating. */ | |
109 | #ifndef REAL_VALUE_FIX_TRUNCATE | |
110 | #define REAL_VALUE_FIX_TRUNCATE(x) ((int) (x)) | |
111 | #endif | |
112 | ||
113 | /* Convert a floating-point value to unsigned integer by truncating. */ | |
114 | #ifndef REAL_VALUE_UNSIGNED_FIX_TRUNCATE | |
115 | #define REAL_VALUE_UNSIGNED_FIX_TRUNCATE(x) ((unsigned int) (x)) | |
116 | #endif | |
117 | ||
118 | /* Convert a floating-point value to integer, using any rounding mode. */ | |
119 | #ifndef REAL_VALUE_FIX | |
120 | #define REAL_VALUE_FIX(x) ((int) (x)) | |
121 | #endif | |
122 | ||
123 | /* Convert a floating-point value to unsigned integer, using any rounding | |
124 | mode. */ | |
125 | #ifndef REAL_VALUE_UNSIGNED_FIX | |
126 | #define REAL_VALUE_UNSIGNED_FIX(x) ((unsigned int) (x)) | |
127 | #endif | |
128 | ||
129 | /* Scale X by Y powers of 2. */ | |
130 | #ifndef REAL_VALUE_LDEXP | |
131 | #define REAL_VALUE_LDEXP(x,y) ldexp (x, y) | |
132 | extern double ldexp (); | |
133 | #endif | |
134 | ||
135 | /* Convert the string X to a floating-point value. */ | |
136 | #ifndef REAL_VALUE_ATOF | |
137 | #define REAL_VALUE_ATOF(x) atof (x) | |
138 | #if defined (MIPSEL) || defined (MIPSEB) | |
139 | /* MIPS compiler can't handle parens around the function name. | |
140 | This problem *does not* appear to be connected with any | |
141 | macro definition for atof. It does not seem there is one. */ | |
142 | extern double atof (); | |
143 | #else | |
144 | extern double (atof) (); | |
145 | #endif | |
146 | #endif | |
147 | ||
148 | /* Negate the floating-point value X. */ | |
149 | #ifndef REAL_VALUE_NEGATE | |
150 | #define REAL_VALUE_NEGATE(x) (- (x)) | |
151 | #endif | |
152 | ||
153 | /* Truncate the floating-point value X to mode MODE. This is correct only | |
154 | for the most common case where the host and target have objects of the same | |
155 | size and where `float' is SFmode. */ | |
156 | ||
5352b11a RS |
157 | /* Don't use REAL_VALUE_TRUNCATE directly--always call real_value_truncate. */ |
158 | extern REAL_VALUE_TYPE real_value_truncate (); | |
159 | ||
0694b47c RS |
160 | #ifndef REAL_VALUE_TRUNCATE |
161 | #define REAL_VALUE_TRUNCATE(mode, x) \ | |
161ca48c RS |
162 | (GET_MODE_BITSIZE (mode) == sizeof (float) * HOST_BITS_PER_CHAR \ |
163 | ? (float) (x) : (x)) | |
0694b47c RS |
164 | #endif |
165 | ||
166 | /* Determine whether a floating-point value X is infinite. */ | |
167 | #ifndef REAL_VALUE_ISINF | |
168 | #define REAL_VALUE_ISINF(x) (target_isinf (x)) | |
169 | #endif | |
170 | ||
3dd4b517 TW |
171 | /* Determine whether a floating-point value X is a NaN. */ |
172 | #ifndef REAL_VALUE_ISNAN | |
173 | #define REAL_VALUE_ISNAN(x) (target_isnan (x)) | |
174 | #endif | |
175 | ||
11030a60 RS |
176 | /* Determine whether a floating-point value X is negative. */ |
177 | #ifndef REAL_VALUE_NEGATIVE | |
178 | #define REAL_VALUE_NEGATIVE(x) (target_negative (x)) | |
179 | #endif | |
180 | ||
0694b47c RS |
181 | /* Determine whether a floating-point value X is minus 0. */ |
182 | #ifndef REAL_VALUE_MINUS_ZERO | |
11030a60 | 183 | #define REAL_VALUE_MINUS_ZERO(x) ((x) == 0 && REAL_VALUE_NEGATIVE (x)) |
0694b47c RS |
184 | #endif |
185 | \f | |
186 | /* Constant real values 0, 1, 2, and -1. */ | |
187 | ||
188 | extern REAL_VALUE_TYPE dconst0; | |
189 | extern REAL_VALUE_TYPE dconst1; | |
190 | extern REAL_VALUE_TYPE dconst2; | |
191 | extern REAL_VALUE_TYPE dconstm1; | |
192 | ||
193 | /* Union type used for extracting real values from CONST_DOUBLEs | |
194 | or putting them in. */ | |
195 | ||
196 | union real_extract | |
197 | { | |
198 | REAL_VALUE_TYPE d; | |
3245eea0 | 199 | HOST_WIDE_INT i[sizeof (REAL_VALUE_TYPE) / sizeof (HOST_WIDE_INT)]; |
0694b47c RS |
200 | }; |
201 | ||
202 | /* For a CONST_DOUBLE: | |
203 | The usual two ints that hold the value. | |
204 | For a DImode, that is all there are; | |
205 | and CONST_DOUBLE_LOW is the low-order word and ..._HIGH the high-order. | |
206 | For a float, the number of ints varies, | |
207 | and CONST_DOUBLE_LOW is the one that should come first *in memory*. | |
208 | So use &CONST_DOUBLE_LOW(r) as the address of an array of ints. */ | |
3245eea0 CH |
209 | #define CONST_DOUBLE_LOW(r) XWINT (r, 2) |
210 | #define CONST_DOUBLE_HIGH(r) XWINT (r, 3) | |
0694b47c RS |
211 | |
212 | /* Link for chain of all CONST_DOUBLEs in use in current function. */ | |
213 | #define CONST_DOUBLE_CHAIN(r) XEXP (r, 1) | |
214 | /* The MEM which represents this CONST_DOUBLE's value in memory, | |
215 | or const0_rtx if no MEM has been made for it yet, | |
216 | or cc0_rtx if it is not on the chain. */ | |
217 | #define CONST_DOUBLE_MEM(r) XEXP (r, 0) | |
218 | ||
219 | /* Function to return a real value (not a tree node) | |
220 | from a given integer constant. */ | |
221 | REAL_VALUE_TYPE real_value_from_int_cst (); | |
222 | ||
223 | /* Given a CONST_DOUBLE in FROM, store into TO the value it represents. */ | |
224 | ||
225 | #define REAL_VALUE_FROM_CONST_DOUBLE(to, from) \ | |
226 | do { union real_extract u; \ | |
227 | bcopy (&CONST_DOUBLE_LOW ((from)), &u, sizeof u); \ | |
228 | to = u.d; } while (0) | |
229 | ||
230 | /* Return a CONST_DOUBLE with value R and mode M. */ | |
231 | ||
232 | #define CONST_DOUBLE_FROM_REAL_VALUE(r,m) immed_real_const_1 (r, m) | |
233 | ||
234 | #endif /* Not REAL_H_INCLUDED */ |