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0694b47c RS |
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 | |
fd76a739 | 27 | #define IBM_FLOAT_FORMAT 3 |
0694b47c RS |
28 | |
29 | /* Default to IEEE float if not specified. Nearly all machines use it. */ | |
30 | ||
31 | #ifndef TARGET_FLOAT_FORMAT | |
32 | #define TARGET_FLOAT_FORMAT IEEE_FLOAT_FORMAT | |
33 | #endif | |
34 | ||
35 | #ifndef HOST_FLOAT_FORMAT | |
36 | #define HOST_FLOAT_FORMAT IEEE_FLOAT_FORMAT | |
37 | #endif | |
38 | ||
39 | #if TARGET_FLOAT_FORMAT == IEEE_FLOAT_FORMAT | |
40 | #define REAL_INFINITY | |
41 | #endif | |
42 | ||
fd76a739 RS |
43 | /* Defining REAL_ARITHMETIC invokes a floating point emulator |
44 | that can produce a target machine format differing by more | |
45 | than just endian-ness from the host's format. The emulator | |
46 | is also used to support extended real XFmode. */ | |
47 | #ifndef LONG_DOUBLE_TYPE_SIZE | |
48 | #define LONG_DOUBLE_TYPE_SIZE 64 | |
49 | #endif | |
50 | #if (LONG_DOUBLE_TYPE_SIZE == 96) || defined (REAL_ARITHMETIC) | |
51 | /* **** Start of software floating point emulator interface macros **** */ | |
52 | ||
53 | /* Support 80-bit extended real XFmode if LONG_DOUBLE_TYPE_SIZE | |
54 | has been defined to be 96 in the tm.h machine file. */ | |
55 | #if (LONG_DOUBLE_TYPE_SIZE == 96) | |
56 | #define REAL_IS_NOT_DOUBLE | |
57 | #define REAL_ARITHMETIC | |
58 | typedef struct { | |
59 | HOST_WIDE_INT r[(11 + sizeof (HOST_WIDE_INT))/(sizeof (HOST_WIDE_INT))]; | |
60 | } realvaluetype; | |
61 | #define REAL_VALUE_TYPE realvaluetype | |
62 | ||
63 | #else /* no XFmode support */ | |
64 | ||
65 | #if HOST_FLOAT_FORMAT != TARGET_FLOAT_FORMAT | |
66 | /* If no XFmode support, then a REAL_VALUE_TYPE is 64 bits wide | |
67 | but it is not necessarily a host machine double. */ | |
68 | #define REAL_IS_NOT_DOUBLE | |
69 | typedef struct { | |
70 | HOST_WIDE_INT r[(7 + sizeof (HOST_WIDE_INT))/(sizeof (HOST_WIDE_INT))]; | |
71 | } realvaluetype; | |
72 | #define REAL_VALUE_TYPE realvaluetype | |
73 | #else | |
74 | /* If host and target formats are compatible, then a REAL_VALUE_TYPE | |
75 | is actually a host machine double. */ | |
76 | #define REAL_VALUE_TYPE double | |
77 | #endif | |
78 | #endif /* no XFmode support */ | |
79 | ||
80 | /* If emulation has been enabled by defining REAL_ARITHMETIC or by | |
81 | setting LONG_DOUBLE_TYPE_SIZE to 96, then define macros so that | |
82 | they invoke emulator functions. This will succeed only if the machine | |
83 | files have been updated to use these macros in place of any | |
84 | references to host machine `double' or `float' types. */ | |
85 | #ifdef REAL_ARITHMETIC | |
86 | #undef REAL_ARITHMETIC | |
87 | #define REAL_ARITHMETIC(value, code, d1, d2) \ | |
88 | earith (&(value), (code), &(d1), &(d2)) | |
89 | ||
90 | /* Declare functions in real.c that are referenced here. */ | |
91 | void earith (), ereal_from_uint (), ereal_from_int (), ereal_to_int (); | |
92 | void etarldouble (), etardouble (); | |
93 | long etarsingle (); | |
94 | int ereal_cmp (), eroundi (), ereal_isneg (); | |
95 | unsigned int eroundui (); | |
96 | REAL_VALUE_TYPE etrunci (), etruncui (), ereal_ldexp (), ereal_atof (); | |
97 | REAL_VALUE_TYPE ereal_negate (), ereal_truncate (); | |
543758c6 | 98 | REAL_VALUE_TYPE ereal_from_float (), ereal_from_double (); |
fd76a739 RS |
99 | |
100 | #define REAL_VALUES_EQUAL(x, y) (ereal_cmp ((x), (y)) == 0) | |
101 | /* true if x < y : */ | |
265b1bae | 102 | #define REAL_VALUES_LESS(x, y) (ereal_cmp ((x), (y)) == -1) |
fd76a739 RS |
103 | #define REAL_VALUE_LDEXP(x, n) ereal_ldexp (x, n) |
104 | ||
105 | /* These return REAL_VALUE_TYPE: */ | |
106 | #define REAL_VALUE_RNDZINT(x) (etrunci (x)) | |
107 | #define REAL_VALUE_UNSIGNED_RNDZINT(x) (etruncui (x)) | |
108 | extern REAL_VALUE_TYPE real_value_truncate (); | |
109 | #define REAL_VALUE_TRUNCATE(mode, x) real_value_truncate (mode, x) | |
110 | ||
111 | /* These return int: */ | |
112 | #define REAL_VALUE_FIX(x) (eroundi (x)) | |
113 | #define REAL_VALUE_UNSIGNED_FIX(x) ((unsigned int) eroundui (x)) | |
114 | ||
115 | #define REAL_VALUE_ATOF ereal_atof | |
116 | #define REAL_VALUE_NEGATE ereal_negate | |
117 | ||
118 | #define REAL_VALUE_MINUS_ZERO(x) \ | |
119 | ((ereal_cmp (x, dconst0) == 0) && (ereal_isneg (x) != 0 )) | |
120 | ||
121 | #define REAL_VALUE_TO_INT ereal_to_int | |
122 | #define REAL_VALUE_FROM_INT(d, i, j) (ereal_from_int (&d, i, j)) | |
123 | #define REAL_VALUE_FROM_UNSIGNED_INT(d, i, j) (ereal_from_uint (&d, i, j)) | |
124 | ||
125 | /* IN is a REAL_VALUE_TYPE. OUT is an array of longs. */ | |
126 | #define REAL_VALUE_TO_TARGET_LONG_DOUBLE(IN, OUT) (etarldouble ((IN), (OUT))) | |
127 | #define REAL_VALUE_TO_TARGET_DOUBLE(IN, OUT) (etardouble ((IN), (OUT))) | |
543758c6 RS |
128 | /* d is an array of longs. */ |
129 | #define REAL_VALUE_FROM_TARGET_DOUBLE(d) (ereal_from_double (d)) | |
fd76a739 RS |
130 | /* IN is a REAL_VALUE_TYPE. OUT is a long. */ |
131 | #define REAL_VALUE_TO_TARGET_SINGLE(IN, OUT) ((OUT) = etarsingle ((IN))) | |
543758c6 RS |
132 | /* f is a long. */ |
133 | #define REAL_VALUE_FROM_TARGET_SINGLE(f) (ereal_from_float (f)) | |
fd76a739 RS |
134 | |
135 | /* Conversions to decimal ASCII string. */ | |
136 | #define REAL_VALUE_TO_DECIMAL(r, fmt, s) (ereal_to_decimal (r, s)) | |
137 | ||
138 | #endif /* REAL_ARITHMETIC defined */ | |
139 | ||
140 | /* **** End of software floating point emulator interface macros **** */ | |
141 | #else /* LONG_DOUBLE_TYPE_SIZE != 96 and REAL_ARITHMETIC not defined */ | |
142 | ||
143 | /* old interface */ | |
0694b47c RS |
144 | #ifdef REAL_ARITHMETIC |
145 | /* Defining REAL_IS_NOT_DOUBLE breaks certain initializations | |
146 | when REAL_ARITHMETIC etc. are not defined. */ | |
147 | ||
148 | /* Now see if the host and target machines use the same format. | |
149 | If not, define REAL_IS_NOT_DOUBLE (even if we end up representing | |
150 | reals as doubles because we have no better way in this cross compiler.) | |
151 | This turns off various optimizations that can happen when we know the | |
152 | compiler's float format matches the target's float format. | |
153 | */ | |
154 | #if HOST_FLOAT_FORMAT != TARGET_FLOAT_FORMAT | |
155 | #define REAL_IS_NOT_DOUBLE | |
156 | #ifndef REAL_VALUE_TYPE | |
fd76a739 RS |
157 | typedef struct { |
158 | HOST_WIDE_INT r[sizeof (double)/sizeof (HOST_WIDE_INT)]; | |
159 | } realvaluetype; | |
160 | #define REAL_VALUE_TYPE realvaluetype | |
0694b47c RS |
161 | #endif /* no REAL_VALUE_TYPE */ |
162 | #endif /* formats differ */ | |
163 | #endif /* 0 */ | |
164 | ||
fd76a739 RS |
165 | #endif /* emulator not used */ |
166 | ||
0694b47c RS |
167 | /* If we are not cross-compiling, use a `double' to represent the |
168 | floating-point value. Otherwise, use some other type | |
169 | (probably a struct containing an array of longs). */ | |
170 | #ifndef REAL_VALUE_TYPE | |
171 | #define REAL_VALUE_TYPE double | |
172 | #else | |
173 | #define REAL_IS_NOT_DOUBLE | |
174 | #endif | |
175 | ||
f9250555 RS |
176 | #if HOST_FLOAT_FORMAT == TARGET_FLOAT_FORMAT |
177 | ||
178 | /* Convert a type `double' value in host format first to a type `float' | |
179 | value in host format and then to a single type `long' value which | |
180 | is the bitwise equivalent of the `float' value. */ | |
fd76a739 | 181 | #ifndef REAL_VALUE_TO_TARGET_SINGLE |
f9250555 RS |
182 | #define REAL_VALUE_TO_TARGET_SINGLE(IN, OUT) \ |
183 | do { float f = (float) (IN); \ | |
184 | (OUT) = *(long *) &f; \ | |
fd76a739 RS |
185 | } while (0) |
186 | #endif | |
f9250555 RS |
187 | |
188 | /* Convert a type `double' value in host format to a pair of type `long' | |
189 | values which is its bitwise equivalent, but put the two words into | |
190 | proper word order for the target. */ | |
fd76a739 | 191 | #ifndef REAL_VALUE_TO_TARGET_DOUBLE |
f9250555 RS |
192 | #if defined (HOST_WORDS_BIG_ENDIAN) == WORDS_BIG_ENDIAN |
193 | #define REAL_VALUE_TO_TARGET_DOUBLE(IN, OUT) \ | |
194 | do { REAL_VALUE_TYPE in = (IN); /* Make sure it's not in a register. */\ | |
195 | (OUT)[0] = ((long *) &in)[0]; \ | |
196 | (OUT)[1] = ((long *) &in)[1]; \ | |
197 | } while (0) | |
198 | #else | |
199 | #define REAL_VALUE_TO_TARGET_DOUBLE(IN, OUT) \ | |
200 | do { REAL_VALUE_TYPE in = (IN); /* Make sure it's not in a register. */\ | |
201 | (OUT)[1] = ((long *) &in)[0]; \ | |
202 | (OUT)[0] = ((long *) &in)[1]; \ | |
203 | } while (0) | |
204 | #endif | |
fd76a739 | 205 | #endif |
f9250555 RS |
206 | #endif /* HOST_FLOAT_FORMAT == TARGET_FLOAT_FORMAT */ |
207 | ||
fd76a739 RS |
208 | /* In this configuration, double and long double are the same. */ |
209 | #ifndef REAL_VALUE_TO_TARGET_LONG_DOUBLE | |
210 | #define REAL_VALUE_TO_TARGET_LONG_DOUBLE(a, b) REAL_VALUE_TO_TARGET_DOUBLE (a, b) | |
211 | #endif | |
212 | ||
0694b47c RS |
213 | /* Compare two floating-point values for equality. */ |
214 | #ifndef REAL_VALUES_EQUAL | |
fd76a739 | 215 | #define REAL_VALUES_EQUAL(x, y) ((x) == (y)) |
0694b47c RS |
216 | #endif |
217 | ||
218 | /* Compare two floating-point values for less than. */ | |
219 | #ifndef REAL_VALUES_LESS | |
fd76a739 | 220 | #define REAL_VALUES_LESS(x, y) ((x) < (y)) |
0694b47c RS |
221 | #endif |
222 | ||
fd76a739 RS |
223 | /* Truncate toward zero to an integer floating-point value. */ |
224 | #ifndef REAL_VALUE_RNDZINT | |
225 | #define REAL_VALUE_RNDZINT(x) ((double) ((int) (x))) | |
0694b47c RS |
226 | #endif |
227 | ||
fd76a739 RS |
228 | /* Truncate toward zero to an unsigned integer floating-point value. */ |
229 | #ifndef REAL_VALUE_UNSIGNED_RNDZINT | |
230 | #define REAL_VALUE_UNSIGNED_RNDZINT(x) ((double) ((unsigned int) (x))) | |
0694b47c RS |
231 | #endif |
232 | ||
233 | /* Convert a floating-point value to integer, using any rounding mode. */ | |
234 | #ifndef REAL_VALUE_FIX | |
235 | #define REAL_VALUE_FIX(x) ((int) (x)) | |
236 | #endif | |
237 | ||
238 | /* Convert a floating-point value to unsigned integer, using any rounding | |
239 | mode. */ | |
240 | #ifndef REAL_VALUE_UNSIGNED_FIX | |
241 | #define REAL_VALUE_UNSIGNED_FIX(x) ((unsigned int) (x)) | |
242 | #endif | |
243 | ||
244 | /* Scale X by Y powers of 2. */ | |
245 | #ifndef REAL_VALUE_LDEXP | |
fd76a739 | 246 | #define REAL_VALUE_LDEXP(x, y) ldexp (x, y) |
0694b47c RS |
247 | extern double ldexp (); |
248 | #endif | |
249 | ||
250 | /* Convert the string X to a floating-point value. */ | |
251 | #ifndef REAL_VALUE_ATOF | |
fd76a739 RS |
252 | #if 1 |
253 | /* Use real.c to convert decimal numbers to binary, ... */ | |
254 | REAL_VALUE_TYPE ereal_atof (); | |
255 | #define REAL_VALUE_ATOF(x, s) ereal_atof (x, s) | |
256 | #else | |
257 | /* ... or, if you like the host computer's atof, go ahead and use it: */ | |
258 | #define REAL_VALUE_ATOF(x, s) atof (x) | |
0694b47c RS |
259 | #if defined (MIPSEL) || defined (MIPSEB) |
260 | /* MIPS compiler can't handle parens around the function name. | |
261 | This problem *does not* appear to be connected with any | |
262 | macro definition for atof. It does not seem there is one. */ | |
263 | extern double atof (); | |
264 | #else | |
265 | extern double (atof) (); | |
266 | #endif | |
267 | #endif | |
fd76a739 | 268 | #endif |
0694b47c RS |
269 | |
270 | /* Negate the floating-point value X. */ | |
271 | #ifndef REAL_VALUE_NEGATE | |
272 | #define REAL_VALUE_NEGATE(x) (- (x)) | |
273 | #endif | |
274 | ||
275 | /* Truncate the floating-point value X to mode MODE. This is correct only | |
276 | for the most common case where the host and target have objects of the same | |
277 | size and where `float' is SFmode. */ | |
278 | ||
5352b11a RS |
279 | /* Don't use REAL_VALUE_TRUNCATE directly--always call real_value_truncate. */ |
280 | extern REAL_VALUE_TYPE real_value_truncate (); | |
281 | ||
0694b47c RS |
282 | #ifndef REAL_VALUE_TRUNCATE |
283 | #define REAL_VALUE_TRUNCATE(mode, x) \ | |
161ca48c RS |
284 | (GET_MODE_BITSIZE (mode) == sizeof (float) * HOST_BITS_PER_CHAR \ |
285 | ? (float) (x) : (x)) | |
0694b47c RS |
286 | #endif |
287 | ||
288 | /* Determine whether a floating-point value X is infinite. */ | |
289 | #ifndef REAL_VALUE_ISINF | |
290 | #define REAL_VALUE_ISINF(x) (target_isinf (x)) | |
291 | #endif | |
292 | ||
3dd4b517 TW |
293 | /* Determine whether a floating-point value X is a NaN. */ |
294 | #ifndef REAL_VALUE_ISNAN | |
295 | #define REAL_VALUE_ISNAN(x) (target_isnan (x)) | |
296 | #endif | |
297 | ||
11030a60 RS |
298 | /* Determine whether a floating-point value X is negative. */ |
299 | #ifndef REAL_VALUE_NEGATIVE | |
300 | #define REAL_VALUE_NEGATIVE(x) (target_negative (x)) | |
301 | #endif | |
302 | ||
0694b47c RS |
303 | /* Determine whether a floating-point value X is minus 0. */ |
304 | #ifndef REAL_VALUE_MINUS_ZERO | |
11030a60 | 305 | #define REAL_VALUE_MINUS_ZERO(x) ((x) == 0 && REAL_VALUE_NEGATIVE (x)) |
0694b47c RS |
306 | #endif |
307 | \f | |
308 | /* Constant real values 0, 1, 2, and -1. */ | |
309 | ||
310 | extern REAL_VALUE_TYPE dconst0; | |
311 | extern REAL_VALUE_TYPE dconst1; | |
312 | extern REAL_VALUE_TYPE dconst2; | |
313 | extern REAL_VALUE_TYPE dconstm1; | |
314 | ||
315 | /* Union type used for extracting real values from CONST_DOUBLEs | |
316 | or putting them in. */ | |
317 | ||
318 | union real_extract | |
319 | { | |
320 | REAL_VALUE_TYPE d; | |
3245eea0 | 321 | HOST_WIDE_INT i[sizeof (REAL_VALUE_TYPE) / sizeof (HOST_WIDE_INT)]; |
0694b47c RS |
322 | }; |
323 | ||
324 | /* For a CONST_DOUBLE: | |
325 | The usual two ints that hold the value. | |
326 | For a DImode, that is all there are; | |
327 | and CONST_DOUBLE_LOW is the low-order word and ..._HIGH the high-order. | |
328 | For a float, the number of ints varies, | |
329 | and CONST_DOUBLE_LOW is the one that should come first *in memory*. | |
330 | So use &CONST_DOUBLE_LOW(r) as the address of an array of ints. */ | |
3245eea0 CH |
331 | #define CONST_DOUBLE_LOW(r) XWINT (r, 2) |
332 | #define CONST_DOUBLE_HIGH(r) XWINT (r, 3) | |
0694b47c RS |
333 | |
334 | /* Link for chain of all CONST_DOUBLEs in use in current function. */ | |
335 | #define CONST_DOUBLE_CHAIN(r) XEXP (r, 1) | |
336 | /* The MEM which represents this CONST_DOUBLE's value in memory, | |
337 | or const0_rtx if no MEM has been made for it yet, | |
338 | or cc0_rtx if it is not on the chain. */ | |
339 | #define CONST_DOUBLE_MEM(r) XEXP (r, 0) | |
340 | ||
341 | /* Function to return a real value (not a tree node) | |
342 | from a given integer constant. */ | |
343 | REAL_VALUE_TYPE real_value_from_int_cst (); | |
344 | ||
345 | /* Given a CONST_DOUBLE in FROM, store into TO the value it represents. */ | |
346 | ||
347 | #define REAL_VALUE_FROM_CONST_DOUBLE(to, from) \ | |
348 | do { union real_extract u; \ | |
349 | bcopy (&CONST_DOUBLE_LOW ((from)), &u, sizeof u); \ | |
350 | to = u.d; } while (0) | |
351 | ||
352 | /* Return a CONST_DOUBLE with value R and mode M. */ | |
353 | ||
fd76a739 RS |
354 | #define CONST_DOUBLE_FROM_REAL_VALUE(r, m) immed_real_const_1 (r, m) |
355 | ||
356 | /* Convert a floating point value `r', that can be interpreted | |
357 | as a host machine float or double, to a decimal ASCII string `s' | |
358 | using printf format string `fmt'. */ | |
359 | #ifndef REAL_VALUE_TO_DECIMAL | |
360 | #define REAL_VALUE_TO_DECIMAL(r, fmt, s) (sprintf (s, fmt, r)) | |
361 | #endif | |
0694b47c RS |
362 | |
363 | #endif /* Not REAL_H_INCLUDED */ |