Mercurial > hg > CbC > CbC_gcc
annotate gcc/real.h @ 158:494b0b89df80 default tip
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author | Shinji KONO <kono@ie.u-ryukyu.ac.jp> |
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date | Mon, 25 May 2020 18:13:55 +0900 |
parents | 1830386684a0 |
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rev | line source |
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0 | 1 /* Definitions of floating-point access for GNU compiler. |
145 | 2 Copyright (C) 1989-2020 Free Software Foundation, Inc. |
0 | 3 |
4 This file is part of GCC. | |
5 | |
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 | |
8 Software Foundation; either version 3, or (at your option) any later | |
9 version. | |
10 | |
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. | |
15 | |
16 You should have received a copy of the GNU General Public License | |
17 along with GCC; see the file COPYING3. If not see | |
18 <http://www.gnu.org/licenses/>. */ | |
19 | |
20 #ifndef GCC_REAL_H | |
21 #define GCC_REAL_H | |
22 | |
23 /* An expanded form of the represented number. */ | |
24 | |
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 | |
33 #define SIGNIFICAND_BITS (128 + HOST_BITS_PER_LONG) | |
34 #define EXP_BITS (32 - 6) | |
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 | |
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39 struct GTY(()) real_value { |
0 | 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. */ | |
43 unsigned int /* ENUM_BITFIELD (real_value_class) */ cl : 2; | |
145 | 44 /* 1 if number is decimal floating point. */ |
0 | 45 unsigned int decimal : 1; |
145 | 46 /* 1 if number is negative. */ |
0 | 47 unsigned int sign : 1; |
145 | 48 /* 1 if number is signalling. */ |
0 | 49 unsigned int signalling : 1; |
145 | 50 /* 1 if number is canonical |
51 All are generally used for handling cases in real.c. */ | |
0 | 52 unsigned int canonical : 1; |
145 | 53 /* unbiased exponent of the number. */ |
0 | 54 unsigned int uexp : EXP_BITS; |
145 | 55 /* significand of the number. */ |
0 | 56 unsigned long sig[SIGSZ]; |
57 }; | |
58 | |
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 | |
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) | |
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 */ | |
78 | |
79 /* Verify the guess. */ | |
80 extern char test_real_width | |
111 | 81 [sizeof (REAL_VALUE_TYPE) <= REAL_WIDTH * sizeof (HOST_WIDE_INT) ? 1 : -1]; |
0 | 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 | |
85 as many as four (32-bit HOST_WIDE_INT, 128-bit REAL_VALUE_TYPE). | |
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 | |
91 # define CONST_DOUBLE_FORMAT "ww" | |
92 #else | |
93 # if REAL_WIDTH == 2 | |
94 # define CONST_DOUBLE_FORMAT "ww" | |
95 # else | |
96 # if REAL_WIDTH == 3 | |
97 # define CONST_DOUBLE_FORMAT "www" | |
98 # else | |
99 # if REAL_WIDTH == 4 | |
100 # define CONST_DOUBLE_FORMAT "wwww" | |
101 # else | |
102 # if REAL_WIDTH == 5 | |
103 # define CONST_DOUBLE_FORMAT "wwwww" | |
104 # else | |
105 # if REAL_WIDTH == 6 | |
106 # define CONST_DOUBLE_FORMAT "wwwwww" | |
107 # else | |
108 #error "REAL_WIDTH > 6 not supported" | |
109 # endif | |
110 # endif | |
111 # endif | |
112 # endif | |
113 # endif | |
114 #endif | |
115 | |
116 | |
117 /* Describes the properties of the specific target format in use. */ | |
118 struct real_format | |
119 { | |
120 /* Move to and from the target bytes. */ | |
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 *); | |
125 | |
126 /* The radix of the exponent and digits of the significand. */ | |
127 int b; | |
128 | |
129 /* Size of the significand in digits of radix B. */ | |
130 int p; | |
131 | |
132 /* Size of the significant of a NaN, in digits of radix B. */ | |
133 int pnan; | |
134 | |
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 | |
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; | |
148 | |
111 | 149 /* If this is an IEEE interchange format, the number of bits in the |
150 format; otherwise, if it is an IEEE extended format, one more | |
151 than the greatest number of bits in an interchange format it | |
152 extends; otherwise 0. Formats need not follow the IEEE 754-2008 | |
153 recommended practice regarding how signaling NaNs are identified, | |
154 and may vary in the choice of default NaN, but must follow other | |
155 IEEE practice regarding having NaNs, infinities and subnormal | |
156 values, and the relation of minimum and maximum exponents, and, | |
157 for interchange formats, the details of the encoding. */ | |
158 int ieee_bits; | |
159 | |
0 | 160 /* Default rounding mode for operations on this format. */ |
161 bool round_towards_zero; | |
162 bool has_sign_dependent_rounding; | |
163 | |
164 /* Properties of the format. */ | |
165 bool has_nans; | |
166 bool has_inf; | |
167 bool has_denorm; | |
168 bool has_signed_zero; | |
169 bool qnan_msb_set; | |
170 bool canonical_nan_lsbs_set; | |
111 | 171 const char *name; |
0 | 172 }; |
173 | |
174 | |
175 /* The target format used for each floating point mode. | |
176 Float modes are followed by decimal float modes, with entries for | |
177 float modes indexed by (MODE - first float mode), and entries for | |
178 decimal float modes indexed by (MODE - first decimal float mode) + | |
179 the number of float modes. */ | |
180 extern const struct real_format * | |
181 real_format_for_mode[MAX_MODE_FLOAT - MIN_MODE_FLOAT + 1 | |
182 + MAX_MODE_DECIMAL_FLOAT - MIN_MODE_DECIMAL_FLOAT + 1]; | |
183 | |
184 #define REAL_MODE_FORMAT(MODE) \ | |
185 (real_format_for_mode[DECIMAL_FLOAT_MODE_P (MODE) \ | |
186 ? (((MODE) - MIN_MODE_DECIMAL_FLOAT) \ | |
187 + (MAX_MODE_FLOAT - MIN_MODE_FLOAT + 1)) \ | |
111 | 188 : GET_MODE_CLASS (MODE) == MODE_FLOAT \ |
189 ? ((MODE) - MIN_MODE_FLOAT) \ | |
190 : (gcc_unreachable (), 0)]) | |
0 | 191 |
192 #define FLOAT_MODE_FORMAT(MODE) \ | |
111 | 193 (REAL_MODE_FORMAT (as_a <scalar_float_mode> (GET_MODE_INNER (MODE)))) |
0 | 194 |
195 /* The following macro determines whether the floating point format is | |
196 composite, i.e. may contain non-consecutive mantissa bits, in which | |
197 case compile-time FP overflow may not model run-time overflow. */ | |
198 #define MODE_COMPOSITE_P(MODE) \ | |
199 (FLOAT_MODE_P (MODE) \ | |
200 && FLOAT_MODE_FORMAT (MODE)->pnan < FLOAT_MODE_FORMAT (MODE)->p) | |
201 | |
202 /* Accessor macros for format properties. */ | |
203 #define MODE_HAS_NANS(MODE) \ | |
204 (FLOAT_MODE_P (MODE) && FLOAT_MODE_FORMAT (MODE)->has_nans) | |
205 #define MODE_HAS_INFINITIES(MODE) \ | |
206 (FLOAT_MODE_P (MODE) && FLOAT_MODE_FORMAT (MODE)->has_inf) | |
207 #define MODE_HAS_SIGNED_ZEROS(MODE) \ | |
208 (FLOAT_MODE_P (MODE) && FLOAT_MODE_FORMAT (MODE)->has_signed_zero) | |
209 #define MODE_HAS_SIGN_DEPENDENT_ROUNDING(MODE) \ | |
210 (FLOAT_MODE_P (MODE) \ | |
211 && FLOAT_MODE_FORMAT (MODE)->has_sign_dependent_rounding) | |
212 | |
111 | 213 /* This class allows functions in this file to accept a floating-point |
214 format as either a mode or an explicit real_format pointer. In the | |
215 former case the mode must be VOIDmode (which means "no particular | |
216 format") or must satisfy SCALAR_FLOAT_MODE_P. */ | |
217 class format_helper | |
218 { | |
219 public: | |
220 format_helper (const real_format *format) : m_format (format) {} | |
221 template<typename T> format_helper (const T &); | |
222 const real_format *operator-> () const { return m_format; } | |
223 operator const real_format *() const { return m_format; } | |
224 | |
225 bool decimal_p () const { return m_format && m_format->b == 10; } | |
131 | 226 bool can_represent_integral_type_p (tree type) const; |
111 | 227 |
228 private: | |
229 const real_format *m_format; | |
230 }; | |
231 | |
232 template<typename T> | |
233 inline format_helper::format_helper (const T &m) | |
234 : m_format (m == VOIDmode ? 0 : REAL_MODE_FORMAT (m)) | |
235 {} | |
236 | |
237 /* Declare functions in real.c. */ | |
238 | |
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239 /* True if the given mode has a NaN representation and the treatment of |
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240 NaN operands is important. Certain optimizations, such as folding |
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241 x * 0 into 0, are not correct for NaN operands, and are normally |
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242 disabled for modes with NaNs. The user can ask for them to be |
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243 done anyway using the -funsafe-math-optimizations switch. */ |
111 | 244 extern bool HONOR_NANS (machine_mode); |
245 extern bool HONOR_NANS (const_tree); | |
246 extern bool HONOR_NANS (const_rtx); | |
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247 |
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248 /* Like HONOR_NANs, but true if we honor signaling NaNs (or sNaNs). */ |
111 | 249 extern bool HONOR_SNANS (machine_mode); |
250 extern bool HONOR_SNANS (const_tree); | |
251 extern bool HONOR_SNANS (const_rtx); | |
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252 |
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253 /* As for HONOR_NANS, but true if the mode can represent infinity and |
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254 the treatment of infinite values is important. */ |
111 | 255 extern bool HONOR_INFINITIES (machine_mode); |
256 extern bool HONOR_INFINITIES (const_tree); | |
257 extern bool HONOR_INFINITIES (const_rtx); | |
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258 |
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259 /* Like HONOR_NANS, but true if the given mode distinguishes between |
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260 positive and negative zero, and the sign of zero is important. */ |
111 | 261 extern bool HONOR_SIGNED_ZEROS (machine_mode); |
262 extern bool HONOR_SIGNED_ZEROS (const_tree); | |
263 extern bool HONOR_SIGNED_ZEROS (const_rtx); | |
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264 |
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265 /* Like HONOR_NANS, but true if given mode supports sign-dependent rounding, |
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266 and the rounding mode is important. */ |
111 | 267 extern bool HONOR_SIGN_DEPENDENT_ROUNDING (machine_mode); |
268 extern bool HONOR_SIGN_DEPENDENT_ROUNDING (const_tree); | |
269 extern bool HONOR_SIGN_DEPENDENT_ROUNDING (const_rtx); | |
0 | 270 |
271 /* Binary or unary arithmetic on tree_code. */ | |
272 extern bool real_arithmetic (REAL_VALUE_TYPE *, int, const REAL_VALUE_TYPE *, | |
273 const REAL_VALUE_TYPE *); | |
274 | |
275 /* Compare reals by tree_code. */ | |
276 extern bool real_compare (int, const REAL_VALUE_TYPE *, const REAL_VALUE_TYPE *); | |
277 | |
278 /* Determine whether a floating-point value X is infinite. */ | |
279 extern bool real_isinf (const REAL_VALUE_TYPE *); | |
280 | |
281 /* Determine whether a floating-point value X is a NaN. */ | |
282 extern bool real_isnan (const REAL_VALUE_TYPE *); | |
283 | |
111 | 284 /* Determine whether a floating-point value X is a signaling NaN. */ |
285 extern bool real_issignaling_nan (const REAL_VALUE_TYPE *); | |
286 | |
0 | 287 /* Determine whether a floating-point value X is finite. */ |
288 extern bool real_isfinite (const REAL_VALUE_TYPE *); | |
289 | |
290 /* Determine whether a floating-point value X is negative. */ | |
291 extern bool real_isneg (const REAL_VALUE_TYPE *); | |
292 | |
293 /* Determine whether a floating-point value X is minus zero. */ | |
294 extern bool real_isnegzero (const REAL_VALUE_TYPE *); | |
295 | |
111 | 296 /* Test relationships between reals. */ |
0 | 297 extern bool real_identical (const REAL_VALUE_TYPE *, const REAL_VALUE_TYPE *); |
111 | 298 extern bool real_equal (const REAL_VALUE_TYPE *, const REAL_VALUE_TYPE *); |
299 extern bool real_less (const REAL_VALUE_TYPE *, const REAL_VALUE_TYPE *); | |
0 | 300 |
111 | 301 /* Extend or truncate to a new format. */ |
302 extern void real_convert (REAL_VALUE_TYPE *, format_helper, | |
0 | 303 const REAL_VALUE_TYPE *); |
304 | |
305 /* Return true if truncating to NEW is exact. */ | |
111 | 306 extern bool exact_real_truncate (format_helper, const REAL_VALUE_TYPE *); |
0 | 307 |
308 /* Render R as a decimal floating point constant. */ | |
309 extern void real_to_decimal (char *, const REAL_VALUE_TYPE *, size_t, | |
310 size_t, int); | |
311 | |
312 /* Render R as a decimal floating point constant, rounded so as to be | |
313 parsed back to the same value when interpreted in mode MODE. */ | |
314 extern void real_to_decimal_for_mode (char *, const REAL_VALUE_TYPE *, size_t, | |
111 | 315 size_t, int, machine_mode); |
0 | 316 |
317 /* Render R as a hexadecimal floating point constant. */ | |
318 extern void real_to_hexadecimal (char *, const REAL_VALUE_TYPE *, | |
319 size_t, size_t, int); | |
320 | |
321 /* Render R as an integer. */ | |
322 extern HOST_WIDE_INT real_to_integer (const REAL_VALUE_TYPE *); | |
323 | |
324 /* Initialize R from a decimal or hexadecimal string. Return -1 if | |
325 the value underflows, +1 if overflows, and 0 otherwise. */ | |
326 extern int real_from_string (REAL_VALUE_TYPE *, const char *); | |
327 /* Wrapper to allow different internal representation for decimal floats. */ | |
111 | 328 extern void real_from_string3 (REAL_VALUE_TYPE *, const char *, format_helper); |
0 | 329 |
111 | 330 extern long real_to_target (long *, const REAL_VALUE_TYPE *, format_helper); |
0 | 331 |
332 extern void real_from_target (REAL_VALUE_TYPE *, const long *, | |
111 | 333 format_helper); |
0 | 334 |
335 extern void real_inf (REAL_VALUE_TYPE *); | |
336 | |
111 | 337 extern bool real_nan (REAL_VALUE_TYPE *, const char *, int, format_helper); |
0 | 338 |
111 | 339 extern void real_maxval (REAL_VALUE_TYPE *, int, machine_mode); |
0 | 340 |
111 | 341 extern void real_2expN (REAL_VALUE_TYPE *, int, format_helper); |
0 | 342 |
343 extern unsigned int real_hash (const REAL_VALUE_TYPE *); | |
344 | |
345 | |
346 /* Target formats defined in real.c. */ | |
347 extern const struct real_format ieee_single_format; | |
348 extern const struct real_format mips_single_format; | |
349 extern const struct real_format motorola_single_format; | |
350 extern const struct real_format spu_single_format; | |
351 extern const struct real_format ieee_double_format; | |
352 extern const struct real_format mips_double_format; | |
353 extern const struct real_format motorola_double_format; | |
354 extern const struct real_format ieee_extended_motorola_format; | |
355 extern const struct real_format ieee_extended_intel_96_format; | |
356 extern const struct real_format ieee_extended_intel_96_round_53_format; | |
357 extern const struct real_format ieee_extended_intel_128_format; | |
358 extern const struct real_format ibm_extended_format; | |
359 extern const struct real_format mips_extended_format; | |
360 extern const struct real_format ieee_quad_format; | |
361 extern const struct real_format mips_quad_format; | |
362 extern const struct real_format vax_f_format; | |
363 extern const struct real_format vax_d_format; | |
364 extern const struct real_format vax_g_format; | |
365 extern const struct real_format real_internal_format; | |
366 extern const struct real_format decimal_single_format; | |
367 extern const struct real_format decimal_double_format; | |
368 extern const struct real_format decimal_quad_format; | |
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369 extern const struct real_format ieee_half_format; |
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370 extern const struct real_format arm_half_format; |
145 | 371 extern const struct real_format arm_bfloat_half_format; |
0 | 372 |
373 | |
374 /* ====================================================================== */ | |
375 /* Crap. */ | |
376 | |
377 /* Determine whether a floating-point value X is infinite. */ | |
378 #define REAL_VALUE_ISINF(x) real_isinf (&(x)) | |
379 | |
380 /* Determine whether a floating-point value X is a NaN. */ | |
381 #define REAL_VALUE_ISNAN(x) real_isnan (&(x)) | |
382 | |
111 | 383 /* Determine whether a floating-point value X is a signaling NaN. */ |
384 #define REAL_VALUE_ISSIGNALING_NAN(x) real_issignaling_nan (&(x)) | |
385 | |
0 | 386 /* Determine whether a floating-point value X is negative. */ |
387 #define REAL_VALUE_NEGATIVE(x) real_isneg (&(x)) | |
388 | |
389 /* Determine whether a floating-point value X is minus zero. */ | |
390 #define REAL_VALUE_MINUS_ZERO(x) real_isnegzero (&(x)) | |
391 | |
392 /* IN is a REAL_VALUE_TYPE. OUT is an array of longs. */ | |
393 #define REAL_VALUE_TO_TARGET_LONG_DOUBLE(IN, OUT) \ | |
394 real_to_target (OUT, &(IN), \ | |
111 | 395 float_mode_for_size (LONG_DOUBLE_TYPE_SIZE).require ()) |
0 | 396 |
397 #define REAL_VALUE_TO_TARGET_DOUBLE(IN, OUT) \ | |
111 | 398 real_to_target (OUT, &(IN), float_mode_for_size (64).require ()) |
0 | 399 |
400 /* IN is a REAL_VALUE_TYPE. OUT is a long. */ | |
401 #define REAL_VALUE_TO_TARGET_SINGLE(IN, OUT) \ | |
111 | 402 ((OUT) = real_to_target (NULL, &(IN), float_mode_for_size (32).require ())) |
0 | 403 |
404 /* Real values to IEEE 754 decimal floats. */ | |
405 | |
406 /* IN is a REAL_VALUE_TYPE. OUT is an array of longs. */ | |
407 #define REAL_VALUE_TO_TARGET_DECIMAL128(IN, OUT) \ | |
111 | 408 real_to_target (OUT, &(IN), decimal_float_mode_for_size (128).require ()) |
0 | 409 |
410 #define REAL_VALUE_TO_TARGET_DECIMAL64(IN, OUT) \ | |
111 | 411 real_to_target (OUT, &(IN), decimal_float_mode_for_size (64).require ()) |
0 | 412 |
413 /* IN is a REAL_VALUE_TYPE. OUT is a long. */ | |
414 #define REAL_VALUE_TO_TARGET_DECIMAL32(IN, OUT) \ | |
111 | 415 ((OUT) = real_to_target (NULL, &(IN), \ |
416 decimal_float_mode_for_size (32).require ())) | |
0 | 417 |
111 | 418 extern REAL_VALUE_TYPE real_value_truncate (format_helper, REAL_VALUE_TYPE); |
0 | 419 |
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420 extern REAL_VALUE_TYPE real_value_negate (const REAL_VALUE_TYPE *); |
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421 extern REAL_VALUE_TYPE real_value_abs (const REAL_VALUE_TYPE *); |
0 | 422 |
111 | 423 extern int significand_size (format_helper); |
0 | 424 |
111 | 425 extern REAL_VALUE_TYPE real_from_string2 (const char *, format_helper); |
0 | 426 |
427 #define REAL_VALUE_ATOF(s, m) \ | |
428 real_from_string2 (s, m) | |
429 | |
430 #define CONST_DOUBLE_ATOF(s, m) \ | |
111 | 431 const_double_from_real_value (real_from_string2 (s, m), m) |
0 | 432 |
433 #define REAL_VALUE_FIX(r) \ | |
434 real_to_integer (&(r)) | |
435 | |
436 /* ??? Not quite right. */ | |
437 #define REAL_VALUE_UNSIGNED_FIX(r) \ | |
438 real_to_integer (&(r)) | |
439 | |
440 /* ??? These were added for Paranoia support. */ | |
441 | |
442 /* Return floor log2(R). */ | |
443 extern int real_exponent (const REAL_VALUE_TYPE *); | |
444 | |
445 /* R = A * 2**EXP. */ | |
446 extern void real_ldexp (REAL_VALUE_TYPE *, const REAL_VALUE_TYPE *, int); | |
447 | |
448 /* **** End of software floating point emulator interface macros **** */ | |
449 | |
450 /* Constant real values 0, 1, 2, -1 and 0.5. */ | |
451 | |
452 extern REAL_VALUE_TYPE dconst0; | |
453 extern REAL_VALUE_TYPE dconst1; | |
454 extern REAL_VALUE_TYPE dconst2; | |
455 extern REAL_VALUE_TYPE dconstm1; | |
456 extern REAL_VALUE_TYPE dconsthalf; | |
457 | |
111 | 458 #define dconst_e() (*dconst_e_ptr ()) |
459 #define dconst_third() (*dconst_third_ptr ()) | |
460 #define dconst_quarter() (*dconst_quarter_ptr ()) | |
461 #define dconst_sixth() (*dconst_sixth_ptr ()) | |
462 #define dconst_ninth() (*dconst_ninth_ptr ()) | |
463 #define dconst_sqrt2() (*dconst_sqrt2_ptr ()) | |
0 | 464 |
465 /* Function to return the real value special constant 'e'. */ | |
466 extern const REAL_VALUE_TYPE * dconst_e_ptr (void); | |
467 | |
111 | 468 /* Returns a cached REAL_VALUE_TYPE corresponding to 1/n, for various n. */ |
469 extern const REAL_VALUE_TYPE *dconst_third_ptr (void); | |
470 extern const REAL_VALUE_TYPE *dconst_quarter_ptr (void); | |
471 extern const REAL_VALUE_TYPE *dconst_sixth_ptr (void); | |
472 extern const REAL_VALUE_TYPE *dconst_ninth_ptr (void); | |
0 | 473 |
474 /* Returns the special REAL_VALUE_TYPE corresponding to sqrt(2). */ | |
475 extern const REAL_VALUE_TYPE * dconst_sqrt2_ptr (void); | |
476 | |
477 /* Function to return a real value (not a tree node) | |
478 from a given integer constant. */ | |
479 REAL_VALUE_TYPE real_value_from_int_cst (const_tree, const_tree); | |
480 | |
111 | 481 /* Return a CONST_DOUBLE with value R and mode M. */ |
482 extern rtx const_double_from_real_value (REAL_VALUE_TYPE, machine_mode); | |
0 | 483 |
111 | 484 /* Replace R by 1/R in the given format, if the result is exact. */ |
485 extern bool exact_real_inverse (format_helper, REAL_VALUE_TYPE *); | |
0 | 486 |
487 /* Return true if arithmetic on values in IMODE that were promoted | |
488 from values in TMODE is equivalent to direct arithmetic on values | |
489 in TMODE. */ | |
111 | 490 bool real_can_shorten_arithmetic (machine_mode, machine_mode); |
0 | 491 |
492 /* In tree.c: wrap up a REAL_VALUE_TYPE in a tree node. */ | |
493 extern tree build_real (tree, REAL_VALUE_TYPE); | |
494 | |
111 | 495 /* Likewise, but first truncate the value to the type. */ |
496 extern tree build_real_truncate (tree, REAL_VALUE_TYPE); | |
0 | 497 |
111 | 498 /* Calculate R as X raised to the integer exponent N in format FMT. */ |
499 extern bool real_powi (REAL_VALUE_TYPE *, format_helper, | |
0 | 500 const REAL_VALUE_TYPE *, HOST_WIDE_INT); |
501 | |
502 /* Standard round to integer value functions. */ | |
111 | 503 extern void real_trunc (REAL_VALUE_TYPE *, format_helper, |
0 | 504 const REAL_VALUE_TYPE *); |
111 | 505 extern void real_floor (REAL_VALUE_TYPE *, format_helper, |
0 | 506 const REAL_VALUE_TYPE *); |
111 | 507 extern void real_ceil (REAL_VALUE_TYPE *, format_helper, |
0 | 508 const REAL_VALUE_TYPE *); |
111 | 509 extern void real_round (REAL_VALUE_TYPE *, format_helper, |
0 | 510 const REAL_VALUE_TYPE *); |
145 | 511 extern void real_roundeven (REAL_VALUE_TYPE *, format_helper, |
512 const REAL_VALUE_TYPE *); | |
0 | 513 |
514 /* Set the sign of R to the sign of X. */ | |
515 extern void real_copysign (REAL_VALUE_TYPE *, const REAL_VALUE_TYPE *); | |
516 | |
517 /* Check whether the real constant value given is an integer. */ | |
111 | 518 extern bool real_isinteger (const REAL_VALUE_TYPE *, format_helper); |
519 extern bool real_isinteger (const REAL_VALUE_TYPE *, HOST_WIDE_INT *); | |
0 | 520 |
131 | 521 /* Calculate nextafter (X, Y) in format FMT. */ |
522 extern bool real_nextafter (REAL_VALUE_TYPE *, format_helper, | |
523 const REAL_VALUE_TYPE *, const REAL_VALUE_TYPE *); | |
524 | |
0 | 525 /* Write into BUF the maximum representable finite floating-point |
526 number, (1 - b**-p) * b**emax for a given FP format FMT as a hex | |
527 float string. BUF must be large enough to contain the result. */ | |
145 | 528 extern void get_max_float (const struct real_format *, char *, size_t, bool); |
111 | 529 |
530 #ifndef GENERATOR_FILE | |
531 /* real related routines. */ | |
532 extern wide_int real_to_integer (const REAL_VALUE_TYPE *, bool *, int); | |
533 extern void real_from_integer (REAL_VALUE_TYPE *, format_helper, | |
534 const wide_int_ref &, signop); | |
535 #endif | |
536 | |
131 | 537 /* Fills r with the largest value such that 1 + r*r won't overflow. |
538 This is used in both sin (atan (x)) and cos (atan(x)) optimizations. */ | |
539 extern void build_sinatan_real (REAL_VALUE_TYPE *, tree); | |
540 | |
0 | 541 #endif /* ! GCC_REAL_H */ |