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e9a25f70 | 1 | /* Definitions of floating-point access for GNU compiler. |
03cd8aba | 2 | Copyright (C) 1989, 1991, 1994, 1996, 1997, 1998, 1999, |
b6a9c30c | 3 | 2000, 2002, 2003, 2004, 2005, 2007 Free Software Foundation, Inc. |
0694b47c | 4 | |
efdc7e19 | 5 | This file is part of GCC. |
0694b47c | 6 | |
efdc7e19 RH |
7 | GCC is free software; you can redistribute it and/or modify it under |
8 | the terms of the GNU General Public License as published by the Free | |
9 | Software Foundation; either version 2, or (at your option) any later | |
10 | version. | |
0694b47c | 11 | |
efdc7e19 RH |
12 | GCC is distributed in the hope that it will be useful, but WITHOUT ANY |
13 | WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
14 | FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License | |
15 | for more details. | |
0694b47c | 16 | |
efdc7e19 RH |
17 | You should have received a copy of the GNU General Public License |
18 | along with GCC; see the file COPYING. If not, write to the Free | |
366ccddb KC |
19 | Software Foundation, 51 Franklin Street, Fifth Floor, Boston, MA |
20 | 02110-1301, USA. */ | |
0694b47c | 21 | |
88657302 RH |
22 | #ifndef GCC_REAL_H |
23 | #define GCC_REAL_H | |
0694b47c | 24 | |
1f3f1f68 KG |
25 | #include <gmp.h> |
26 | #include <mpfr.h> | |
11ad4784 ZW |
27 | #include "machmode.h" |
28 | ||
0ee6fdb5 | 29 | /* An expanded form of the represented number. */ |
ba31d94e | 30 | |
0ee6fdb5 RH |
31 | /* Enumerate the special cases of numbers that we encounter. */ |
32 | enum real_value_class { | |
33 | rvc_zero, | |
34 | rvc_normal, | |
35 | rvc_inf, | |
36 | rvc_nan | |
37 | }; | |
38 | ||
ee6ff319 | 39 | #define SIGNIFICAND_BITS (128 + HOST_BITS_PER_LONG) |
909e2256 | 40 | #define EXP_BITS (32 - 6) |
0ee6fdb5 RH |
41 | #define MAX_EXP ((1 << (EXP_BITS - 1)) - 1) |
42 | #define SIGSZ (SIGNIFICAND_BITS / HOST_BITS_PER_LONG) | |
43 | #define SIG_MSB ((unsigned long)1 << (HOST_BITS_PER_LONG - 1)) | |
44 | ||
45 | struct real_value GTY(()) | |
46 | { | |
1e92bbb9 AO |
47 | /* Use the same underlying type for all bit-fields, so as to make |
48 | sure they're packed together, otherwise REAL_VALUE_TYPE_SIZE will | |
49 | be miscomputed. */ | |
e3a64162 | 50 | unsigned int /* ENUM_BITFIELD (real_value_class) */ cl : 2; |
909e2256 | 51 | unsigned int decimal : 1; |
0ee6fdb5 | 52 | unsigned int sign : 1; |
ad59ba20 | 53 | unsigned int signalling : 1; |
fe0002ee | 54 | unsigned int canonical : 1; |
1e92bbb9 | 55 | unsigned int uexp : EXP_BITS; |
0ee6fdb5 RH |
56 | unsigned long sig[SIGSZ]; |
57 | }; | |
fd76a739 | 58 | |
1e92bbb9 AO |
59 | #define REAL_EXP(REAL) \ |
60 | ((int)((REAL)->uexp ^ (unsigned int)(1 << (EXP_BITS - 1))) \ | |
61 | - (1 << (EXP_BITS - 1))) | |
62 | #define SET_REAL_EXP(REAL, EXP) \ | |
63 | ((REAL)->uexp = ((unsigned int)(EXP) & (unsigned int)((1 << EXP_BITS) - 1))) | |
64 | ||
0ee6fdb5 RH |
65 | /* Various headers condition prototypes on #ifdef REAL_VALUE_TYPE, so it |
66 | needs to be a macro. We do need to continue to have a structure tag | |
67 | so that other headers can forward declare it. */ | |
68 | #define REAL_VALUE_TYPE struct real_value | |
69 | ||
70 | /* We store a REAL_VALUE_TYPE into an rtx, and we do this by putting it in | |
71 | consecutive "w" slots. Moreover, we've got to compute the number of "w" | |
72 | slots at preprocessor time, which means we can't use sizeof. Guess. */ | |
73 | ||
74 | #define REAL_VALUE_TYPE_SIZE (SIGNIFICAND_BITS + 32) | |
46468cd9 ZW |
75 | #define REAL_WIDTH \ |
76 | (REAL_VALUE_TYPE_SIZE/HOST_BITS_PER_WIDE_INT \ | |
77 | + (REAL_VALUE_TYPE_SIZE%HOST_BITS_PER_WIDE_INT ? 1 : 0)) /* round up */ | |
efdc7e19 | 78 | |
0ee6fdb5 RH |
79 | /* Verify the guess. */ |
80 | extern char test_real_width | |
81 | [sizeof(REAL_VALUE_TYPE) <= REAL_WIDTH*sizeof(HOST_WIDE_INT) ? 1 : -1]; | |
46468cd9 ZW |
82 | |
83 | /* Calculate the format for CONST_DOUBLE. We need as many slots as | |
84 | are necessary to overlay a REAL_VALUE_TYPE on them. This could be | |
efdc7e19 | 85 | as many as four (32-bit HOST_WIDE_INT, 128-bit REAL_VALUE_TYPE). |
46468cd9 ZW |
86 | |
87 | A number of places assume that there are always at least two 'w' | |
88 | slots in a CONST_DOUBLE, so we provide them even if one would suffice. */ | |
89 | ||
90 | #if REAL_WIDTH == 1 | |
5692c7bc | 91 | # define CONST_DOUBLE_FORMAT "ww" |
46468cd9 ZW |
92 | #else |
93 | # if REAL_WIDTH == 2 | |
5692c7bc | 94 | # define CONST_DOUBLE_FORMAT "ww" |
46468cd9 ZW |
95 | # else |
96 | # if REAL_WIDTH == 3 | |
5692c7bc | 97 | # define CONST_DOUBLE_FORMAT "www" |
46468cd9 ZW |
98 | # else |
99 | # if REAL_WIDTH == 4 | |
5692c7bc | 100 | # define CONST_DOUBLE_FORMAT "wwww" |
46468cd9 ZW |
101 | # else |
102 | # if REAL_WIDTH == 5 | |
5692c7bc | 103 | # define CONST_DOUBLE_FORMAT "wwwww" |
46468cd9 | 104 | # else |
ee6ff319 RH |
105 | # if REAL_WIDTH == 6 |
106 | # define CONST_DOUBLE_FORMAT "wwwwww" | |
107 | # else | |
108 | #error "REAL_WIDTH > 6 not supported" | |
109 | # endif | |
46468cd9 ZW |
110 | # endif |
111 | # endif | |
112 | # endif | |
113 | # endif | |
114 | #endif | |
fd76a739 | 115 | |
84f9b8e9 | 116 | |
3dc85dfb RH |
117 | /* Describes the properties of the specific target format in use. */ |
118 | struct real_format | |
119 | { | |
120 | /* Move to and from the target bytes. */ | |
0c20a65f AJ |
121 | void (*encode) (const struct real_format *, long *, |
122 | const REAL_VALUE_TYPE *); | |
123 | void (*decode) (const struct real_format *, REAL_VALUE_TYPE *, | |
124 | const long *); | |
3dc85dfb RH |
125 | |
126 | /* The radix of the exponent and digits of the significand. */ | |
127 | int b; | |
128 | ||
3dc85dfb RH |
129 | /* Size of the significand in digits of radix B. */ |
130 | int p; | |
131 | ||
fe0002ee AO |
132 | /* Size of the significant of a NaN, in digits of radix B. */ |
133 | int pnan; | |
134 | ||
3dc85dfb RH |
135 | /* The minimum negative integer, x, such that b**(x-1) is normalized. */ |
136 | int emin; | |
137 | ||
138 | /* The maximum integer, x, such that b**(x-1) is representable. */ | |
139 | int emax; | |
140 | ||
b87a0206 RS |
141 | /* The bit position of the sign bit, for determining whether a value |
142 | is positive/negative, or -1 for a complex encoding. */ | |
143 | int signbit_ro; | |
144 | ||
145 | /* The bit position of the sign bit, for changing the sign of a number, | |
146 | or -1 for a complex encoding. */ | |
147 | int signbit_rw; | |
4977bab6 | 148 | |
3dc85dfb RH |
149 | /* Properties of the format. */ |
150 | bool has_nans; | |
151 | bool has_inf; | |
152 | bool has_denorm; | |
153 | bool has_signed_zero; | |
154 | bool qnan_msb_set; | |
58145e4d | 155 | bool canonical_nan_lsbs_set; |
3dc85dfb RH |
156 | }; |
157 | ||
158 | ||
909e2256 JG |
159 | /* The target format used for each floating point mode. |
160 | Float modes are followed by decimal float modes, with entries for | |
161 | float modes indexed by (MODE - first float mode), and entries for | |
162 | decimal float modes indexed by (MODE - first decimal float mode) + | |
163 | the number of float modes. */ | |
0974c7d7 | 164 | extern const struct real_format * |
909e2256 JG |
165 | real_format_for_mode[MAX_MODE_FLOAT - MIN_MODE_FLOAT + 1 |
166 | + MAX_MODE_DECIMAL_FLOAT - MIN_MODE_DECIMAL_FLOAT + 1]; | |
3dc85dfb | 167 | |
909e2256 JG |
168 | #define REAL_MODE_FORMAT(MODE) \ |
169 | (real_format_for_mode[DECIMAL_FLOAT_MODE_P (MODE) \ | |
170 | ? ((MODE - MIN_MODE_DECIMAL_FLOAT) \ | |
171 | + (MAX_MODE_FLOAT - MIN_MODE_FLOAT + 1)) \ | |
172 | : (MODE - MIN_MODE_FLOAT)]) | |
3dc85dfb | 173 | |
762297d9 RS |
174 | /* The following macro determines whether the floating point format is |
175 | composite, i.e. may contain non-consecutive mantissa bits, in which | |
176 | case compile-time FP overflow may not model run-time overflow. */ | |
177 | #define REAL_MODE_FORMAT_COMPOSITE_P(MODE) \ | |
178 | ((REAL_MODE_FORMAT(MODE))->pnan < (REAL_MODE_FORMAT (MODE))->p) | |
179 | ||
3dc85dfb | 180 | /* Declare functions in real.c. */ |
fd76a739 | 181 | |
efdc7e19 | 182 | /* Binary or unary arithmetic on tree_code. */ |
d284eb28 | 183 | extern bool real_arithmetic (REAL_VALUE_TYPE *, int, const REAL_VALUE_TYPE *, |
0c20a65f | 184 | const REAL_VALUE_TYPE *); |
efdc7e19 RH |
185 | |
186 | /* Compare reals by tree_code. */ | |
0c20a65f | 187 | extern bool real_compare (int, const REAL_VALUE_TYPE *, const REAL_VALUE_TYPE *); |
efdc7e19 RH |
188 | |
189 | /* Determine whether a floating-point value X is infinite. */ | |
0c20a65f | 190 | extern bool real_isinf (const REAL_VALUE_TYPE *); |
efdc7e19 RH |
191 | |
192 | /* Determine whether a floating-point value X is a NaN. */ | |
0c20a65f | 193 | extern bool real_isnan (const REAL_VALUE_TYPE *); |
efdc7e19 | 194 | |
4c8c70e0 KG |
195 | /* Determine whether a floating-point value X is finite. */ |
196 | extern bool real_isfinite (const REAL_VALUE_TYPE *); | |
197 | ||
efdc7e19 | 198 | /* Determine whether a floating-point value X is negative. */ |
0c20a65f | 199 | extern bool real_isneg (const REAL_VALUE_TYPE *); |
efdc7e19 RH |
200 | |
201 | /* Determine whether a floating-point value X is minus zero. */ | |
0c20a65f | 202 | extern bool real_isnegzero (const REAL_VALUE_TYPE *); |
efdc7e19 RH |
203 | |
204 | /* Compare two floating-point objects for bitwise identity. */ | |
0c20a65f | 205 | extern bool real_identical (const REAL_VALUE_TYPE *, const REAL_VALUE_TYPE *); |
fd76a739 | 206 | |
efdc7e19 | 207 | /* Extend or truncate to a new mode. */ |
0c20a65f AJ |
208 | extern void real_convert (REAL_VALUE_TYPE *, enum machine_mode, |
209 | const REAL_VALUE_TYPE *); | |
efdc7e19 RH |
210 | |
211 | /* Return true if truncating to NEW is exact. */ | |
0c20a65f | 212 | extern bool exact_real_truncate (enum machine_mode, const REAL_VALUE_TYPE *); |
efdc7e19 RH |
213 | |
214 | /* Render R as a decimal floating point constant. */ | |
0c20a65f AJ |
215 | extern void real_to_decimal (char *, const REAL_VALUE_TYPE *, size_t, |
216 | size_t, int); | |
efdc7e19 RH |
217 | |
218 | /* Render R as a hexadecimal floating point constant. */ | |
0c20a65f AJ |
219 | extern void real_to_hexadecimal (char *, const REAL_VALUE_TYPE *, |
220 | size_t, size_t, int); | |
efdc7e19 RH |
221 | |
222 | /* Render R as an integer. */ | |
0c20a65f AJ |
223 | extern HOST_WIDE_INT real_to_integer (const REAL_VALUE_TYPE *); |
224 | extern void real_to_integer2 (HOST_WIDE_INT *, HOST_WIDE_INT *, | |
225 | const REAL_VALUE_TYPE *); | |
efdc7e19 | 226 | |
92ef5cf9 MLI |
227 | /* Initialize R from a decimal or hexadecimal string. Return -1 if |
228 | the value underflows, +1 if overflows, and 0 otherwise. */ | |
229 | extern int real_from_string (REAL_VALUE_TYPE *, const char *); | |
909e2256 JG |
230 | /* Wrapper to allow different internal representation for decimal floats. */ |
231 | extern void real_from_string3 (REAL_VALUE_TYPE *, const char *, enum machine_mode); | |
efdc7e19 RH |
232 | |
233 | /* Initialize R from an integer pair HIGH/LOW. */ | |
0c20a65f AJ |
234 | extern void real_from_integer (REAL_VALUE_TYPE *, enum machine_mode, |
235 | unsigned HOST_WIDE_INT, HOST_WIDE_INT, int); | |
8f9eb495 | 236 | |
0c20a65f AJ |
237 | extern long real_to_target_fmt (long *, const REAL_VALUE_TYPE *, |
238 | const struct real_format *); | |
239 | extern long real_to_target (long *, const REAL_VALUE_TYPE *, enum machine_mode); | |
fd76a739 | 240 | |
0c20a65f AJ |
241 | extern void real_from_target_fmt (REAL_VALUE_TYPE *, const long *, |
242 | const struct real_format *); | |
243 | extern void real_from_target (REAL_VALUE_TYPE *, const long *, | |
244 | enum machine_mode); | |
6f4d7222 | 245 | |
0c20a65f | 246 | extern void real_inf (REAL_VALUE_TYPE *); |
fd76a739 | 247 | |
0c20a65f | 248 | extern bool real_nan (REAL_VALUE_TYPE *, const char *, int, enum machine_mode); |
efdc7e19 | 249 | |
0c20a65f | 250 | extern void real_maxval (REAL_VALUE_TYPE *, int, enum machine_mode); |
18c2511c | 251 | |
0c20a65f | 252 | extern void real_2expN (REAL_VALUE_TYPE *, int); |
efdc7e19 | 253 | |
0c20a65f | 254 | extern unsigned int real_hash (const REAL_VALUE_TYPE *); |
46b33600 | 255 | |
3dc85dfb RH |
256 | |
257 | /* Target formats defined in real.c. */ | |
258 | extern const struct real_format ieee_single_format; | |
fe0002ee | 259 | extern const struct real_format mips_single_format; |
b6a9c30c | 260 | extern const struct real_format motorola_single_format; |
3dc85dfb | 261 | extern const struct real_format ieee_double_format; |
fe0002ee | 262 | extern const struct real_format mips_double_format; |
b6a9c30c | 263 | extern const struct real_format motorola_double_format; |
3dc85dfb RH |
264 | extern const struct real_format ieee_extended_motorola_format; |
265 | extern const struct real_format ieee_extended_intel_96_format; | |
bfa0c519 | 266 | extern const struct real_format ieee_extended_intel_96_round_53_format; |
3dc85dfb | 267 | extern const struct real_format ieee_extended_intel_128_format; |
d454e75a | 268 | extern const struct real_format ibm_extended_format; |
fe0002ee | 269 | extern const struct real_format mips_extended_format; |
3dc85dfb | 270 | extern const struct real_format ieee_quad_format; |
fe0002ee | 271 | extern const struct real_format mips_quad_format; |
3dc85dfb RH |
272 | extern const struct real_format vax_f_format; |
273 | extern const struct real_format vax_d_format; | |
274 | extern const struct real_format vax_g_format; | |
3dc85dfb RH |
275 | extern const struct real_format c4x_single_format; |
276 | extern const struct real_format c4x_extended_format; | |
5e26e5a2 | 277 | extern const struct real_format real_internal_format; |
909e2256 JG |
278 | extern const struct real_format decimal_single_format; |
279 | extern const struct real_format decimal_double_format; | |
280 | extern const struct real_format decimal_quad_format; | |
3dc85dfb RH |
281 | |
282 | ||
efdc7e19 RH |
283 | /* ====================================================================== */ |
284 | /* Crap. */ | |
285 | ||
efdc7e19 RH |
286 | #define REAL_ARITHMETIC(value, code, d1, d2) \ |
287 | real_arithmetic (&(value), code, &(d1), &(d2)) | |
288 | ||
289 | #define REAL_VALUES_IDENTICAL(x, y) real_identical (&(x), &(y)) | |
290 | #define REAL_VALUES_EQUAL(x, y) real_compare (EQ_EXPR, &(x), &(y)) | |
291 | #define REAL_VALUES_LESS(x, y) real_compare (LT_EXPR, &(x), &(y)) | |
15e5ad76 | 292 | |
ba31d94e | 293 | /* Determine whether a floating-point value X is infinite. */ |
efdc7e19 | 294 | #define REAL_VALUE_ISINF(x) real_isinf (&(x)) |
ba31d94e ZW |
295 | |
296 | /* Determine whether a floating-point value X is a NaN. */ | |
efdc7e19 | 297 | #define REAL_VALUE_ISNAN(x) real_isnan (&(x)) |
ba31d94e ZW |
298 | |
299 | /* Determine whether a floating-point value X is negative. */ | |
efdc7e19 | 300 | #define REAL_VALUE_NEGATIVE(x) real_isneg (&(x)) |
ba31d94e ZW |
301 | |
302 | /* Determine whether a floating-point value X is minus zero. */ | |
efdc7e19 RH |
303 | #define REAL_VALUE_MINUS_ZERO(x) real_isnegzero (&(x)) |
304 | ||
305 | /* IN is a REAL_VALUE_TYPE. OUT is an array of longs. */ | |
306 | #define REAL_VALUE_TO_TARGET_LONG_DOUBLE(IN, OUT) \ | |
307 | real_to_target (OUT, &(IN), \ | |
308 | mode_for_size (LONG_DOUBLE_TYPE_SIZE, MODE_FLOAT, 0)) | |
fd76a739 | 309 | |
efdc7e19 RH |
310 | #define REAL_VALUE_TO_TARGET_DOUBLE(IN, OUT) \ |
311 | real_to_target (OUT, &(IN), mode_for_size (64, MODE_FLOAT, 0)) | |
91d61207 | 312 | |
efdc7e19 RH |
313 | /* IN is a REAL_VALUE_TYPE. OUT is a long. */ |
314 | #define REAL_VALUE_TO_TARGET_SINGLE(IN, OUT) \ | |
315 | ((OUT) = real_to_target (NULL, &(IN), mode_for_size (32, MODE_FLOAT, 0))) | |
91d61207 | 316 | |
efdc7e19 RH |
317 | #define REAL_VALUE_FROM_INT(r, lo, hi, mode) \ |
318 | real_from_integer (&(r), mode, lo, hi, 0) | |
7bb5d01e | 319 | |
efdc7e19 RH |
320 | #define REAL_VALUE_FROM_UNSIGNED_INT(r, lo, hi, mode) \ |
321 | real_from_integer (&(r), mode, lo, hi, 1) | |
322 | ||
909e2256 JG |
323 | /* Real values to IEEE 754R decimal floats. */ |
324 | ||
325 | /* IN is a REAL_VALUE_TYPE. OUT is an array of longs. */ | |
326 | #define REAL_VALUE_TO_TARGET_DECIMAL128(IN, OUT) \ | |
327 | real_to_target (OUT, &(IN), mode_for_size (128, MODE_DECIMAL_FLOAT, 0)) | |
328 | ||
329 | #define REAL_VALUE_TO_TARGET_DECIMAL64(IN, OUT) \ | |
330 | real_to_target (OUT, &(IN), mode_for_size (64, MODE_DECIMAL_FLOAT, 0)) | |
331 | ||
332 | /* IN is a REAL_VALUE_TYPE. OUT is a long. */ | |
333 | #define REAL_VALUE_TO_TARGET_DECIMAL32(IN, OUT) \ | |
334 | ((OUT) = real_to_target (NULL, &(IN), mode_for_size (32, MODE_DECIMAL_FLOAT, 0))) | |
335 | ||
0c20a65f AJ |
336 | extern REAL_VALUE_TYPE real_value_truncate (enum machine_mode, |
337 | REAL_VALUE_TYPE); | |
efdc7e19 RH |
338 | |
339 | #define REAL_VALUE_TO_INT(plow, phigh, r) \ | |
340 | real_to_integer2 (plow, phigh, &(r)) | |
341 | ||
0c20a65f AJ |
342 | extern REAL_VALUE_TYPE real_arithmetic2 (int, const REAL_VALUE_TYPE *, |
343 | const REAL_VALUE_TYPE *); | |
efdc7e19 RH |
344 | |
345 | #define REAL_VALUE_NEGATE(X) \ | |
346 | real_arithmetic2 (NEGATE_EXPR, &(X), NULL) | |
7bb5d01e | 347 | |
efdc7e19 RH |
348 | #define REAL_VALUE_ABS(X) \ |
349 | real_arithmetic2 (ABS_EXPR, &(X), NULL) | |
7bb6fbd1 | 350 | |
0c20a65f | 351 | extern int significand_size (enum machine_mode); |
7bb6fbd1 | 352 | |
0c20a65f | 353 | extern REAL_VALUE_TYPE real_from_string2 (const char *, enum machine_mode); |
7bb5d01e | 354 | |
efdc7e19 RH |
355 | #define REAL_VALUE_ATOF(s, m) \ |
356 | real_from_string2 (s, m) | |
fd76a739 | 357 | |
efdc7e19 RH |
358 | #define CONST_DOUBLE_ATOF(s, m) \ |
359 | CONST_DOUBLE_FROM_REAL_VALUE (real_from_string2 (s, m), m) | |
360 | ||
361 | #define REAL_VALUE_FIX(r) \ | |
362 | real_to_integer (&(r)) | |
363 | ||
364 | /* ??? Not quite right. */ | |
365 | #define REAL_VALUE_UNSIGNED_FIX(r) \ | |
366 | real_to_integer (&(r)) | |
367 | ||
368 | /* ??? These were added for Paranoia support. */ | |
369 | ||
370 | /* Return floor log2(R). */ | |
0c20a65f | 371 | extern int real_exponent (const REAL_VALUE_TYPE *); |
efdc7e19 RH |
372 | |
373 | /* R = A * 2**EXP. */ | |
0c20a65f | 374 | extern void real_ldexp (REAL_VALUE_TYPE *, const REAL_VALUE_TYPE *, int); |
fd76a739 | 375 | |
fd76a739 | 376 | /* **** End of software floating point emulator interface macros **** */ |
0694b47c | 377 | \f |
f7657db9 | 378 | /* Constant real values 0, 1, 2, 3, 10, -1, -2, 0.5 and 1/3. */ |
0694b47c RS |
379 | |
380 | extern REAL_VALUE_TYPE dconst0; | |
381 | extern REAL_VALUE_TYPE dconst1; | |
382 | extern REAL_VALUE_TYPE dconst2; | |
f7657db9 KG |
383 | extern REAL_VALUE_TYPE dconst3; |
384 | extern REAL_VALUE_TYPE dconst10; | |
0694b47c | 385 | extern REAL_VALUE_TYPE dconstm1; |
03f2ea93 RS |
386 | extern REAL_VALUE_TYPE dconstm2; |
387 | extern REAL_VALUE_TYPE dconsthalf; | |
f7657db9 | 388 | extern REAL_VALUE_TYPE dconstthird; |
b86a760a | 389 | extern REAL_VALUE_TYPE dconstsqrt2; |
ab01a87c | 390 | extern REAL_VALUE_TYPE dconste; |
0694b47c | 391 | |
0694b47c RS |
392 | /* Function to return a real value (not a tree node) |
393 | from a given integer constant. */ | |
9566a759 | 394 | REAL_VALUE_TYPE real_value_from_int_cst (const_tree, const_tree); |
0694b47c | 395 | |
efdc7e19 RH |
396 | /* Given a CONST_DOUBLE in FROM, store into TO the value it represents. */ |
397 | #define REAL_VALUE_FROM_CONST_DOUBLE(to, from) \ | |
9e254451 | 398 | ((to) = *CONST_DOUBLE_REAL_VALUE (from)) |
0694b47c RS |
399 | |
400 | /* Return a CONST_DOUBLE with value R and mode M. */ | |
5692c7bc ZW |
401 | #define CONST_DOUBLE_FROM_REAL_VALUE(r, m) \ |
402 | const_double_from_real_value (r, m) | |
0c20a65f | 403 | extern rtx const_double_from_real_value (REAL_VALUE_TYPE, enum machine_mode); |
5692c7bc | 404 | |
ebc8186b | 405 | /* Replace R by 1/R in the given machine mode, if the result is exact. */ |
0c20a65f | 406 | extern bool exact_real_inverse (enum machine_mode, REAL_VALUE_TYPE *); |
ebc8186b | 407 | |
11ad4784 | 408 | /* In tree.c: wrap up a REAL_VALUE_TYPE in a tree node. */ |
0c20a65f | 409 | extern tree build_real (tree, REAL_VALUE_TYPE); |
11ad4784 | 410 | |
4977bab6 | 411 | /* Calculate R as the square root of X in the given machine mode. */ |
0c20a65f AJ |
412 | extern bool real_sqrt (REAL_VALUE_TYPE *, enum machine_mode, |
413 | const REAL_VALUE_TYPE *); | |
11ad4784 | 414 | |
71c0e7fc | 415 | /* Calculate R as X raised to the integer exponent N in mode MODE. */ |
0c20a65f AJ |
416 | extern bool real_powi (REAL_VALUE_TYPE *, enum machine_mode, |
417 | const REAL_VALUE_TYPE *, HOST_WIDE_INT); | |
e82a312b | 418 | |
0a9530a9 | 419 | /* Standard round to integer value functions. */ |
0c20a65f AJ |
420 | extern void real_trunc (REAL_VALUE_TYPE *, enum machine_mode, |
421 | const REAL_VALUE_TYPE *); | |
422 | extern void real_floor (REAL_VALUE_TYPE *, enum machine_mode, | |
423 | const REAL_VALUE_TYPE *); | |
424 | extern void real_ceil (REAL_VALUE_TYPE *, enum machine_mode, | |
425 | const REAL_VALUE_TYPE *); | |
25348c94 RS |
426 | extern void real_round (REAL_VALUE_TYPE *, enum machine_mode, |
427 | const REAL_VALUE_TYPE *); | |
0a9530a9 | 428 | |
67057c53 RS |
429 | /* Set the sign of R to the sign of X. */ |
430 | extern void real_copysign (REAL_VALUE_TYPE *, const REAL_VALUE_TYPE *); | |
431 | ||
1f3f1f68 KG |
432 | /* Convert between MPFR and REAL_VALUE_TYPE. The caller is |
433 | responsible for initializing and clearing the MPFR parameter. */ | |
434 | ||
205a4d09 BM |
435 | extern void real_from_mpfr (REAL_VALUE_TYPE *, mpfr_srcptr, tree, mp_rnd_t); |
436 | extern void mpfr_from_real (mpfr_ptr, const REAL_VALUE_TYPE *, mp_rnd_t); | |
1f3f1f68 | 437 | |
313f234b MLI |
438 | /* Check whether the real constant value given is an integer. */ |
439 | extern bool real_isinteger (const REAL_VALUE_TYPE *c, enum machine_mode mode); | |
440 | ||
7faa1bbb KG |
441 | /* Write into BUF the maximum representable finite floating-point |
442 | number, (1 - b**-p) * b**emax for a given FP format FMT as a hex | |
443 | float string. BUF must be large enough to contain the result. */ | |
444 | extern void get_max_float (const struct real_format *, char *, size_t); | |
88657302 | 445 | #endif /* ! GCC_REAL_H */ |