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e9a25f70 | 1 | /* Definitions of floating-point access for GNU compiler. |
5624e564 | 2 | Copyright (C) 1989-2015 Free Software Foundation, Inc. |
0694b47c | 3 | |
efdc7e19 | 4 | This file is part of GCC. |
0694b47c | 5 | |
efdc7e19 RH |
6 | GCC is free software; you can redistribute it and/or modify it under |
7 | the terms of the GNU General Public License as published by the Free | |
9dcd6f09 | 8 | Software Foundation; either version 3, or (at your option) any later |
efdc7e19 | 9 | version. |
0694b47c | 10 | |
efdc7e19 RH |
11 | GCC is distributed in the hope that it will be useful, but WITHOUT ANY |
12 | WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
13 | FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License | |
14 | for more details. | |
0694b47c | 15 | |
efdc7e19 | 16 | You should have received a copy of the GNU General Public License |
9dcd6f09 NC |
17 | along with GCC; see the file COPYING3. If not see |
18 | <http://www.gnu.org/licenses/>. */ | |
0694b47c | 19 | |
88657302 RH |
20 | #ifndef GCC_REAL_H |
21 | #define GCC_REAL_H | |
0694b47c | 22 | |
0ee6fdb5 | 23 | /* An expanded form of the represented number. */ |
ba31d94e | 24 | |
0ee6fdb5 RH |
25 | /* Enumerate the special cases of numbers that we encounter. */ |
26 | enum real_value_class { | |
27 | rvc_zero, | |
28 | rvc_normal, | |
29 | rvc_inf, | |
30 | rvc_nan | |
31 | }; | |
32 | ||
ee6ff319 | 33 | #define SIGNIFICAND_BITS (128 + HOST_BITS_PER_LONG) |
909e2256 | 34 | #define EXP_BITS (32 - 6) |
0ee6fdb5 RH |
35 | #define MAX_EXP ((1 << (EXP_BITS - 1)) - 1) |
36 | #define SIGSZ (SIGNIFICAND_BITS / HOST_BITS_PER_LONG) | |
37 | #define SIG_MSB ((unsigned long)1 << (HOST_BITS_PER_LONG - 1)) | |
38 | ||
d1b38208 | 39 | struct GTY(()) real_value { |
1e92bbb9 AO |
40 | /* Use the same underlying type for all bit-fields, so as to make |
41 | sure they're packed together, otherwise REAL_VALUE_TYPE_SIZE will | |
42 | be miscomputed. */ | |
e3a64162 | 43 | unsigned int /* ENUM_BITFIELD (real_value_class) */ cl : 2; |
909e2256 | 44 | unsigned int decimal : 1; |
0ee6fdb5 | 45 | unsigned int sign : 1; |
ad59ba20 | 46 | unsigned int signalling : 1; |
fe0002ee | 47 | unsigned int canonical : 1; |
1e92bbb9 | 48 | unsigned int uexp : EXP_BITS; |
0ee6fdb5 RH |
49 | unsigned long sig[SIGSZ]; |
50 | }; | |
fd76a739 | 51 | |
1e92bbb9 AO |
52 | #define REAL_EXP(REAL) \ |
53 | ((int)((REAL)->uexp ^ (unsigned int)(1 << (EXP_BITS - 1))) \ | |
54 | - (1 << (EXP_BITS - 1))) | |
55 | #define SET_REAL_EXP(REAL, EXP) \ | |
56 | ((REAL)->uexp = ((unsigned int)(EXP) & (unsigned int)((1 << EXP_BITS) - 1))) | |
57 | ||
0ee6fdb5 RH |
58 | /* Various headers condition prototypes on #ifdef REAL_VALUE_TYPE, so it |
59 | needs to be a macro. We do need to continue to have a structure tag | |
60 | so that other headers can forward declare it. */ | |
61 | #define REAL_VALUE_TYPE struct real_value | |
62 | ||
63 | /* We store a REAL_VALUE_TYPE into an rtx, and we do this by putting it in | |
64 | consecutive "w" slots. Moreover, we've got to compute the number of "w" | |
65 | slots at preprocessor time, which means we can't use sizeof. Guess. */ | |
66 | ||
67 | #define REAL_VALUE_TYPE_SIZE (SIGNIFICAND_BITS + 32) | |
46468cd9 ZW |
68 | #define REAL_WIDTH \ |
69 | (REAL_VALUE_TYPE_SIZE/HOST_BITS_PER_WIDE_INT \ | |
70 | + (REAL_VALUE_TYPE_SIZE%HOST_BITS_PER_WIDE_INT ? 1 : 0)) /* round up */ | |
efdc7e19 | 71 | |
0ee6fdb5 RH |
72 | /* Verify the guess. */ |
73 | extern char test_real_width | |
c3284718 | 74 | [sizeof (REAL_VALUE_TYPE) <= REAL_WIDTH * sizeof (HOST_WIDE_INT) ? 1 : -1]; |
46468cd9 ZW |
75 | |
76 | /* Calculate the format for CONST_DOUBLE. We need as many slots as | |
77 | are necessary to overlay a REAL_VALUE_TYPE on them. This could be | |
efdc7e19 | 78 | as many as four (32-bit HOST_WIDE_INT, 128-bit REAL_VALUE_TYPE). |
46468cd9 ZW |
79 | |
80 | A number of places assume that there are always at least two 'w' | |
81 | slots in a CONST_DOUBLE, so we provide them even if one would suffice. */ | |
82 | ||
83 | #if REAL_WIDTH == 1 | |
5692c7bc | 84 | # define CONST_DOUBLE_FORMAT "ww" |
46468cd9 ZW |
85 | #else |
86 | # if REAL_WIDTH == 2 | |
5692c7bc | 87 | # define CONST_DOUBLE_FORMAT "ww" |
46468cd9 ZW |
88 | # else |
89 | # if REAL_WIDTH == 3 | |
5692c7bc | 90 | # define CONST_DOUBLE_FORMAT "www" |
46468cd9 ZW |
91 | # else |
92 | # if REAL_WIDTH == 4 | |
5692c7bc | 93 | # define CONST_DOUBLE_FORMAT "wwww" |
46468cd9 ZW |
94 | # else |
95 | # if REAL_WIDTH == 5 | |
5692c7bc | 96 | # define CONST_DOUBLE_FORMAT "wwwww" |
46468cd9 | 97 | # else |
ee6ff319 RH |
98 | # if REAL_WIDTH == 6 |
99 | # define CONST_DOUBLE_FORMAT "wwwwww" | |
100 | # else | |
101 | #error "REAL_WIDTH > 6 not supported" | |
102 | # endif | |
46468cd9 ZW |
103 | # endif |
104 | # endif | |
105 | # endif | |
106 | # endif | |
107 | #endif | |
fd76a739 | 108 | |
84f9b8e9 | 109 | |
3dc85dfb RH |
110 | /* Describes the properties of the specific target format in use. */ |
111 | struct real_format | |
112 | { | |
113 | /* Move to and from the target bytes. */ | |
0c20a65f AJ |
114 | void (*encode) (const struct real_format *, long *, |
115 | const REAL_VALUE_TYPE *); | |
116 | void (*decode) (const struct real_format *, REAL_VALUE_TYPE *, | |
117 | const long *); | |
3dc85dfb RH |
118 | |
119 | /* The radix of the exponent and digits of the significand. */ | |
120 | int b; | |
121 | ||
3dc85dfb RH |
122 | /* Size of the significand in digits of radix B. */ |
123 | int p; | |
124 | ||
fe0002ee AO |
125 | /* Size of the significant of a NaN, in digits of radix B. */ |
126 | int pnan; | |
127 | ||
3dc85dfb RH |
128 | /* The minimum negative integer, x, such that b**(x-1) is normalized. */ |
129 | int emin; | |
130 | ||
131 | /* The maximum integer, x, such that b**(x-1) is representable. */ | |
132 | int emax; | |
133 | ||
b87a0206 RS |
134 | /* The bit position of the sign bit, for determining whether a value |
135 | is positive/negative, or -1 for a complex encoding. */ | |
136 | int signbit_ro; | |
137 | ||
138 | /* The bit position of the sign bit, for changing the sign of a number, | |
139 | or -1 for a complex encoding. */ | |
140 | int signbit_rw; | |
4977bab6 | 141 | |
3e479de3 UW |
142 | /* Default rounding mode for operations on this format. */ |
143 | bool round_towards_zero; | |
4099e2c2 | 144 | bool has_sign_dependent_rounding; |
3e479de3 | 145 | |
3dc85dfb RH |
146 | /* Properties of the format. */ |
147 | bool has_nans; | |
148 | bool has_inf; | |
149 | bool has_denorm; | |
150 | bool has_signed_zero; | |
151 | bool qnan_msb_set; | |
58145e4d | 152 | bool canonical_nan_lsbs_set; |
db847fa8 | 153 | const char *name; |
3dc85dfb RH |
154 | }; |
155 | ||
156 | ||
909e2256 JG |
157 | /* The target format used for each floating point mode. |
158 | Float modes are followed by decimal float modes, with entries for | |
159 | float modes indexed by (MODE - first float mode), and entries for | |
160 | decimal float modes indexed by (MODE - first decimal float mode) + | |
161 | the number of float modes. */ | |
0974c7d7 | 162 | extern const struct real_format * |
909e2256 JG |
163 | real_format_for_mode[MAX_MODE_FLOAT - MIN_MODE_FLOAT + 1 |
164 | + MAX_MODE_DECIMAL_FLOAT - MIN_MODE_DECIMAL_FLOAT + 1]; | |
3dc85dfb | 165 | |
909e2256 JG |
166 | #define REAL_MODE_FORMAT(MODE) \ |
167 | (real_format_for_mode[DECIMAL_FLOAT_MODE_P (MODE) \ | |
4099e2c2 | 168 | ? (((MODE) - MIN_MODE_DECIMAL_FLOAT) \ |
909e2256 | 169 | + (MAX_MODE_FLOAT - MIN_MODE_FLOAT + 1)) \ |
4099e2c2 UW |
170 | : ((MODE) - MIN_MODE_FLOAT)]) |
171 | ||
172 | #define FLOAT_MODE_FORMAT(MODE) \ | |
173 | (REAL_MODE_FORMAT (SCALAR_FLOAT_MODE_P (MODE)? (MODE) \ | |
174 | : GET_MODE_INNER (MODE))) | |
3dc85dfb | 175 | |
762297d9 RS |
176 | /* The following macro determines whether the floating point format is |
177 | composite, i.e. may contain non-consecutive mantissa bits, in which | |
178 | case compile-time FP overflow may not model run-time overflow. */ | |
4099e2c2 UW |
179 | #define MODE_COMPOSITE_P(MODE) \ |
180 | (FLOAT_MODE_P (MODE) \ | |
181 | && FLOAT_MODE_FORMAT (MODE)->pnan < FLOAT_MODE_FORMAT (MODE)->p) | |
182 | ||
183 | /* Accessor macros for format properties. */ | |
184 | #define MODE_HAS_NANS(MODE) \ | |
185 | (FLOAT_MODE_P (MODE) && FLOAT_MODE_FORMAT (MODE)->has_nans) | |
186 | #define MODE_HAS_INFINITIES(MODE) \ | |
187 | (FLOAT_MODE_P (MODE) && FLOAT_MODE_FORMAT (MODE)->has_inf) | |
188 | #define MODE_HAS_SIGNED_ZEROS(MODE) \ | |
189 | (FLOAT_MODE_P (MODE) && FLOAT_MODE_FORMAT (MODE)->has_signed_zero) | |
190 | #define MODE_HAS_SIGN_DEPENDENT_ROUNDING(MODE) \ | |
191 | (FLOAT_MODE_P (MODE) \ | |
192 | && FLOAT_MODE_FORMAT (MODE)->has_sign_dependent_rounding) | |
193 | ||
3d3dbadd MG |
194 | /* Declare functions in real.c. */ |
195 | ||
6a4d4e8a RO |
196 | /* True if the given mode has a NaN representation and the treatment of |
197 | NaN operands is important. Certain optimizations, such as folding | |
198 | x * 0 into 0, are not correct for NaN operands, and are normally | |
199 | disabled for modes with NaNs. The user can ask for them to be | |
200 | done anyway using the -funsafe-math-optimizations switch. */ | |
1b457aa4 MG |
201 | extern bool HONOR_NANS (machine_mode); |
202 | extern bool HONOR_NANS (const_tree); | |
203 | extern bool HONOR_NANS (const_rtx); | |
6a4d4e8a RO |
204 | |
205 | /* Like HONOR_NANs, but true if we honor signaling NaNs (or sNaNs). */ | |
3d3dbadd MG |
206 | extern bool HONOR_SNANS (machine_mode); |
207 | extern bool HONOR_SNANS (const_tree); | |
208 | extern bool HONOR_SNANS (const_rtx); | |
6a4d4e8a RO |
209 | |
210 | /* As for HONOR_NANS, but true if the mode can represent infinity and | |
211 | the treatment of infinite values is important. */ | |
3d3dbadd MG |
212 | extern bool HONOR_INFINITIES (machine_mode); |
213 | extern bool HONOR_INFINITIES (const_tree); | |
214 | extern bool HONOR_INFINITIES (const_rtx); | |
6a4d4e8a RO |
215 | |
216 | /* Like HONOR_NANS, but true if the given mode distinguishes between | |
217 | positive and negative zero, and the sign of zero is important. */ | |
3d3dbadd MG |
218 | extern bool HONOR_SIGNED_ZEROS (machine_mode); |
219 | extern bool HONOR_SIGNED_ZEROS (const_tree); | |
220 | extern bool HONOR_SIGNED_ZEROS (const_rtx); | |
6a4d4e8a RO |
221 | |
222 | /* Like HONOR_NANS, but true if given mode supports sign-dependent rounding, | |
223 | and the rounding mode is important. */ | |
3d3dbadd MG |
224 | extern bool HONOR_SIGN_DEPENDENT_ROUNDING (machine_mode); |
225 | extern bool HONOR_SIGN_DEPENDENT_ROUNDING (const_tree); | |
226 | extern bool HONOR_SIGN_DEPENDENT_ROUNDING (const_rtx); | |
fd76a739 | 227 | |
efdc7e19 | 228 | /* Binary or unary arithmetic on tree_code. */ |
d284eb28 | 229 | extern bool real_arithmetic (REAL_VALUE_TYPE *, int, const REAL_VALUE_TYPE *, |
0c20a65f | 230 | const REAL_VALUE_TYPE *); |
efdc7e19 RH |
231 | |
232 | /* Compare reals by tree_code. */ | |
0c20a65f | 233 | extern bool real_compare (int, const REAL_VALUE_TYPE *, const REAL_VALUE_TYPE *); |
efdc7e19 RH |
234 | |
235 | /* Determine whether a floating-point value X is infinite. */ | |
0c20a65f | 236 | extern bool real_isinf (const REAL_VALUE_TYPE *); |
efdc7e19 RH |
237 | |
238 | /* Determine whether a floating-point value X is a NaN. */ | |
0c20a65f | 239 | extern bool real_isnan (const REAL_VALUE_TYPE *); |
efdc7e19 | 240 | |
4c8c70e0 KG |
241 | /* Determine whether a floating-point value X is finite. */ |
242 | extern bool real_isfinite (const REAL_VALUE_TYPE *); | |
243 | ||
efdc7e19 | 244 | /* Determine whether a floating-point value X is negative. */ |
0c20a65f | 245 | extern bool real_isneg (const REAL_VALUE_TYPE *); |
efdc7e19 RH |
246 | |
247 | /* Determine whether a floating-point value X is minus zero. */ | |
0c20a65f | 248 | extern bool real_isnegzero (const REAL_VALUE_TYPE *); |
efdc7e19 | 249 | |
624d31fe | 250 | /* Test relationships between reals. */ |
0c20a65f | 251 | extern bool real_identical (const REAL_VALUE_TYPE *, const REAL_VALUE_TYPE *); |
624d31fe | 252 | extern bool real_equal (const REAL_VALUE_TYPE *, const REAL_VALUE_TYPE *); |
8cb41028 | 253 | extern bool real_less (const REAL_VALUE_TYPE *, const REAL_VALUE_TYPE *); |
fd76a739 | 254 | |
efdc7e19 | 255 | /* Extend or truncate to a new mode. */ |
ef4bddc2 | 256 | extern void real_convert (REAL_VALUE_TYPE *, machine_mode, |
0c20a65f | 257 | const REAL_VALUE_TYPE *); |
efdc7e19 RH |
258 | |
259 | /* Return true if truncating to NEW is exact. */ | |
ef4bddc2 | 260 | extern bool exact_real_truncate (machine_mode, const REAL_VALUE_TYPE *); |
efdc7e19 RH |
261 | |
262 | /* Render R as a decimal floating point constant. */ | |
0c20a65f AJ |
263 | extern void real_to_decimal (char *, const REAL_VALUE_TYPE *, size_t, |
264 | size_t, int); | |
efdc7e19 | 265 | |
3e479de3 UW |
266 | /* Render R as a decimal floating point constant, rounded so as to be |
267 | parsed back to the same value when interpreted in mode MODE. */ | |
268 | extern void real_to_decimal_for_mode (char *, const REAL_VALUE_TYPE *, size_t, | |
ef4bddc2 | 269 | size_t, int, machine_mode); |
3e479de3 | 270 | |
efdc7e19 | 271 | /* Render R as a hexadecimal floating point constant. */ |
0c20a65f AJ |
272 | extern void real_to_hexadecimal (char *, const REAL_VALUE_TYPE *, |
273 | size_t, size_t, int); | |
efdc7e19 RH |
274 | |
275 | /* Render R as an integer. */ | |
0c20a65f | 276 | extern HOST_WIDE_INT real_to_integer (const REAL_VALUE_TYPE *); |
efdc7e19 | 277 | |
92ef5cf9 MLI |
278 | /* Initialize R from a decimal or hexadecimal string. Return -1 if |
279 | the value underflows, +1 if overflows, and 0 otherwise. */ | |
280 | extern int real_from_string (REAL_VALUE_TYPE *, const char *); | |
909e2256 | 281 | /* Wrapper to allow different internal representation for decimal floats. */ |
ef4bddc2 | 282 | extern void real_from_string3 (REAL_VALUE_TYPE *, const char *, machine_mode); |
efdc7e19 | 283 | |
0c20a65f AJ |
284 | extern long real_to_target_fmt (long *, const REAL_VALUE_TYPE *, |
285 | const struct real_format *); | |
ef4bddc2 | 286 | extern long real_to_target (long *, const REAL_VALUE_TYPE *, machine_mode); |
fd76a739 | 287 | |
0c20a65f AJ |
288 | extern void real_from_target_fmt (REAL_VALUE_TYPE *, const long *, |
289 | const struct real_format *); | |
290 | extern void real_from_target (REAL_VALUE_TYPE *, const long *, | |
ef4bddc2 | 291 | machine_mode); |
6f4d7222 | 292 | |
0c20a65f | 293 | extern void real_inf (REAL_VALUE_TYPE *); |
fd76a739 | 294 | |
ef4bddc2 | 295 | extern bool real_nan (REAL_VALUE_TYPE *, const char *, int, machine_mode); |
efdc7e19 | 296 | |
ef4bddc2 | 297 | extern void real_maxval (REAL_VALUE_TYPE *, int, machine_mode); |
18c2511c | 298 | |
ef4bddc2 | 299 | extern void real_2expN (REAL_VALUE_TYPE *, int, machine_mode); |
efdc7e19 | 300 | |
0c20a65f | 301 | extern unsigned int real_hash (const REAL_VALUE_TYPE *); |
46b33600 | 302 | |
3dc85dfb RH |
303 | |
304 | /* Target formats defined in real.c. */ | |
305 | extern const struct real_format ieee_single_format; | |
fe0002ee | 306 | extern const struct real_format mips_single_format; |
b6a9c30c | 307 | extern const struct real_format motorola_single_format; |
88f091f5 | 308 | extern const struct real_format spu_single_format; |
3dc85dfb | 309 | extern const struct real_format ieee_double_format; |
fe0002ee | 310 | extern const struct real_format mips_double_format; |
b6a9c30c | 311 | extern const struct real_format motorola_double_format; |
3dc85dfb RH |
312 | extern const struct real_format ieee_extended_motorola_format; |
313 | extern const struct real_format ieee_extended_intel_96_format; | |
bfa0c519 | 314 | extern const struct real_format ieee_extended_intel_96_round_53_format; |
3dc85dfb | 315 | extern const struct real_format ieee_extended_intel_128_format; |
d454e75a | 316 | extern const struct real_format ibm_extended_format; |
fe0002ee | 317 | extern const struct real_format mips_extended_format; |
3dc85dfb | 318 | extern const struct real_format ieee_quad_format; |
fe0002ee | 319 | extern const struct real_format mips_quad_format; |
3dc85dfb RH |
320 | extern const struct real_format vax_f_format; |
321 | extern const struct real_format vax_d_format; | |
322 | extern const struct real_format vax_g_format; | |
5e26e5a2 | 323 | extern const struct real_format real_internal_format; |
909e2256 JG |
324 | extern const struct real_format decimal_single_format; |
325 | extern const struct real_format decimal_double_format; | |
326 | extern const struct real_format decimal_quad_format; | |
ae63687c SL |
327 | extern const struct real_format ieee_half_format; |
328 | extern const struct real_format arm_half_format; | |
3dc85dfb RH |
329 | |
330 | ||
efdc7e19 RH |
331 | /* ====================================================================== */ |
332 | /* Crap. */ | |
333 | ||
ba31d94e | 334 | /* Determine whether a floating-point value X is infinite. */ |
efdc7e19 | 335 | #define REAL_VALUE_ISINF(x) real_isinf (&(x)) |
ba31d94e ZW |
336 | |
337 | /* Determine whether a floating-point value X is a NaN. */ | |
efdc7e19 | 338 | #define REAL_VALUE_ISNAN(x) real_isnan (&(x)) |
ba31d94e ZW |
339 | |
340 | /* Determine whether a floating-point value X is negative. */ | |
efdc7e19 | 341 | #define REAL_VALUE_NEGATIVE(x) real_isneg (&(x)) |
ba31d94e ZW |
342 | |
343 | /* Determine whether a floating-point value X is minus zero. */ | |
efdc7e19 RH |
344 | #define REAL_VALUE_MINUS_ZERO(x) real_isnegzero (&(x)) |
345 | ||
346 | /* IN is a REAL_VALUE_TYPE. OUT is an array of longs. */ | |
347 | #define REAL_VALUE_TO_TARGET_LONG_DOUBLE(IN, OUT) \ | |
348 | real_to_target (OUT, &(IN), \ | |
349 | mode_for_size (LONG_DOUBLE_TYPE_SIZE, MODE_FLOAT, 0)) | |
fd76a739 | 350 | |
efdc7e19 RH |
351 | #define REAL_VALUE_TO_TARGET_DOUBLE(IN, OUT) \ |
352 | real_to_target (OUT, &(IN), mode_for_size (64, MODE_FLOAT, 0)) | |
91d61207 | 353 | |
efdc7e19 RH |
354 | /* IN is a REAL_VALUE_TYPE. OUT is a long. */ |
355 | #define REAL_VALUE_TO_TARGET_SINGLE(IN, OUT) \ | |
356 | ((OUT) = real_to_target (NULL, &(IN), mode_for_size (32, MODE_FLOAT, 0))) | |
91d61207 | 357 | |
7292b8e4 | 358 | /* Real values to IEEE 754 decimal floats. */ |
909e2256 JG |
359 | |
360 | /* IN is a REAL_VALUE_TYPE. OUT is an array of longs. */ | |
361 | #define REAL_VALUE_TO_TARGET_DECIMAL128(IN, OUT) \ | |
362 | real_to_target (OUT, &(IN), mode_for_size (128, MODE_DECIMAL_FLOAT, 0)) | |
363 | ||
364 | #define REAL_VALUE_TO_TARGET_DECIMAL64(IN, OUT) \ | |
365 | real_to_target (OUT, &(IN), mode_for_size (64, MODE_DECIMAL_FLOAT, 0)) | |
366 | ||
367 | /* IN is a REAL_VALUE_TYPE. OUT is a long. */ | |
368 | #define REAL_VALUE_TO_TARGET_DECIMAL32(IN, OUT) \ | |
369 | ((OUT) = real_to_target (NULL, &(IN), mode_for_size (32, MODE_DECIMAL_FLOAT, 0))) | |
370 | ||
ef4bddc2 | 371 | extern REAL_VALUE_TYPE real_value_truncate (machine_mode, |
0c20a65f | 372 | REAL_VALUE_TYPE); |
efdc7e19 | 373 | |
d49b6e1e SB |
374 | extern REAL_VALUE_TYPE real_value_negate (const REAL_VALUE_TYPE *); |
375 | extern REAL_VALUE_TYPE real_value_abs (const REAL_VALUE_TYPE *); | |
7bb6fbd1 | 376 | |
ef4bddc2 | 377 | extern int significand_size (machine_mode); |
7bb6fbd1 | 378 | |
ef4bddc2 | 379 | extern REAL_VALUE_TYPE real_from_string2 (const char *, machine_mode); |
7bb5d01e | 380 | |
efdc7e19 RH |
381 | #define REAL_VALUE_ATOF(s, m) \ |
382 | real_from_string2 (s, m) | |
fd76a739 | 383 | |
efdc7e19 | 384 | #define CONST_DOUBLE_ATOF(s, m) \ |
555affd7 | 385 | const_double_from_real_value (real_from_string2 (s, m), m) |
efdc7e19 RH |
386 | |
387 | #define REAL_VALUE_FIX(r) \ | |
388 | real_to_integer (&(r)) | |
389 | ||
390 | /* ??? Not quite right. */ | |
391 | #define REAL_VALUE_UNSIGNED_FIX(r) \ | |
392 | real_to_integer (&(r)) | |
393 | ||
394 | /* ??? These were added for Paranoia support. */ | |
395 | ||
396 | /* Return floor log2(R). */ | |
0c20a65f | 397 | extern int real_exponent (const REAL_VALUE_TYPE *); |
efdc7e19 RH |
398 | |
399 | /* R = A * 2**EXP. */ | |
0c20a65f | 400 | extern void real_ldexp (REAL_VALUE_TYPE *, const REAL_VALUE_TYPE *, int); |
fd76a739 | 401 | |
fd76a739 | 402 | /* **** End of software floating point emulator interface macros **** */ |
0694b47c | 403 | \f |
aefa9d43 | 404 | /* Constant real values 0, 1, 2, -1 and 0.5. */ |
0694b47c RS |
405 | |
406 | extern REAL_VALUE_TYPE dconst0; | |
407 | extern REAL_VALUE_TYPE dconst1; | |
408 | extern REAL_VALUE_TYPE dconst2; | |
409 | extern REAL_VALUE_TYPE dconstm1; | |
03f2ea93 | 410 | extern REAL_VALUE_TYPE dconsthalf; |
aefa9d43 | 411 | |
9c02cf68 MLI |
412 | #define dconst_e() (*dconst_e_ptr ()) |
413 | #define dconst_third() (*dconst_third_ptr ()) | |
414 | #define dconst_sqrt2() (*dconst_sqrt2_ptr ()) | |
415 | ||
416 | /* Function to return the real value special constant 'e'. */ | |
417 | extern const REAL_VALUE_TYPE * dconst_e_ptr (void); | |
418 | ||
419 | /* Returns the special REAL_VALUE_TYPE corresponding to 1/3. */ | |
420 | extern const REAL_VALUE_TYPE * dconst_third_ptr (void); | |
aefa9d43 | 421 | |
9c02cf68 MLI |
422 | /* Returns the special REAL_VALUE_TYPE corresponding to sqrt(2). */ |
423 | extern const REAL_VALUE_TYPE * dconst_sqrt2_ptr (void); | |
0694b47c | 424 | |
0694b47c RS |
425 | /* Function to return a real value (not a tree node) |
426 | from a given integer constant. */ | |
9566a759 | 427 | REAL_VALUE_TYPE real_value_from_int_cst (const_tree, const_tree); |
0694b47c | 428 | |
efdc7e19 RH |
429 | /* Given a CONST_DOUBLE in FROM, store into TO the value it represents. */ |
430 | #define REAL_VALUE_FROM_CONST_DOUBLE(to, from) \ | |
9e254451 | 431 | ((to) = *CONST_DOUBLE_REAL_VALUE (from)) |
0694b47c RS |
432 | |
433 | /* Return a CONST_DOUBLE with value R and mode M. */ | |
ef4bddc2 | 434 | extern rtx const_double_from_real_value (REAL_VALUE_TYPE, machine_mode); |
5692c7bc | 435 | |
ebc8186b | 436 | /* Replace R by 1/R in the given machine mode, if the result is exact. */ |
ef4bddc2 | 437 | extern bool exact_real_inverse (machine_mode, REAL_VALUE_TYPE *); |
ebc8186b | 438 | |
20ded7a6 JM |
439 | /* Return true if arithmetic on values in IMODE that were promoted |
440 | from values in TMODE is equivalent to direct arithmetic on values | |
441 | in TMODE. */ | |
ef4bddc2 | 442 | bool real_can_shorten_arithmetic (machine_mode, machine_mode); |
20ded7a6 | 443 | |
11ad4784 | 444 | /* In tree.c: wrap up a REAL_VALUE_TYPE in a tree node. */ |
0c20a65f | 445 | extern tree build_real (tree, REAL_VALUE_TYPE); |
11ad4784 | 446 | |
71c0e7fc | 447 | /* Calculate R as X raised to the integer exponent N in mode MODE. */ |
ef4bddc2 | 448 | extern bool real_powi (REAL_VALUE_TYPE *, machine_mode, |
0c20a65f | 449 | const REAL_VALUE_TYPE *, HOST_WIDE_INT); |
e82a312b | 450 | |
0a9530a9 | 451 | /* Standard round to integer value functions. */ |
ef4bddc2 | 452 | extern void real_trunc (REAL_VALUE_TYPE *, machine_mode, |
0c20a65f | 453 | const REAL_VALUE_TYPE *); |
ef4bddc2 | 454 | extern void real_floor (REAL_VALUE_TYPE *, machine_mode, |
0c20a65f | 455 | const REAL_VALUE_TYPE *); |
ef4bddc2 | 456 | extern void real_ceil (REAL_VALUE_TYPE *, machine_mode, |
0c20a65f | 457 | const REAL_VALUE_TYPE *); |
ef4bddc2 | 458 | extern void real_round (REAL_VALUE_TYPE *, machine_mode, |
25348c94 | 459 | const REAL_VALUE_TYPE *); |
0a9530a9 | 460 | |
67057c53 RS |
461 | /* Set the sign of R to the sign of X. */ |
462 | extern void real_copysign (REAL_VALUE_TYPE *, const REAL_VALUE_TYPE *); | |
463 | ||
313f234b | 464 | /* Check whether the real constant value given is an integer. */ |
ef4bddc2 | 465 | extern bool real_isinteger (const REAL_VALUE_TYPE *c, machine_mode mode); |
313f234b | 466 | |
7faa1bbb KG |
467 | /* Write into BUF the maximum representable finite floating-point |
468 | number, (1 - b**-p) * b**emax for a given FP format FMT as a hex | |
469 | float string. BUF must be large enough to contain the result. */ | |
470 | extern void get_max_float (const struct real_format *, char *, size_t); | |
807e902e KZ |
471 | |
472 | #ifndef GENERATOR_FILE | |
473 | /* real related routines. */ | |
474 | extern wide_int real_to_integer (const REAL_VALUE_TYPE *, bool *, int); | |
ef4bddc2 | 475 | extern void real_from_integer (REAL_VALUE_TYPE *, machine_mode, |
807e902e KZ |
476 | const wide_int_ref &, signop); |
477 | #endif | |
478 | ||
88657302 | 479 | #endif /* ! GCC_REAL_H */ |