1 | /* Definitions of floating-point access for GNU compiler. |
2 | Copyright (C) 1989-2022 Free Software Foundation, Inc. |
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 | |
39 | struct GTY(()) real_value { |
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; |
44 | /* 1 if number is decimal floating point. */ |
45 | unsigned int decimal : 1; |
46 | /* 1 if number is negative. */ |
47 | unsigned int sign : 1; |
48 | /* 1 if number is signalling. */ |
49 | unsigned int signalling : 1; |
50 | /* 1 if number is canonical |
51 | All are generally used for handling cases in real.cc. */ |
52 | unsigned int canonical : 1; |
53 | /* unbiased exponent of the number. */ |
54 | unsigned int uexp : EXP_BITS; |
55 | /* significand of the number. */ |
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 |
81 | [sizeof (REAL_VALUE_TYPE) <= REAL_WIDTH * sizeof (HOST_WIDE_INT) ? 1 : -1]; |
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 | |
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 | |
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; |
171 | const char *name; |
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[NUM_MODE_FLOAT + NUM_MODE_DECIMAL_FLOAT]; |
182 | |
183 | #define REAL_MODE_FORMAT(MODE) \ |
184 | (real_format_for_mode[DECIMAL_FLOAT_MODE_P (MODE) \ |
185 | ? (((MODE) - MIN_MODE_DECIMAL_FLOAT) \ |
186 | + NUM_MODE_FLOAT) \ |
187 | : GET_MODE_CLASS (MODE) == MODE_FLOAT \ |
188 | ? ((MODE) - MIN_MODE_FLOAT) \ |
189 | : (gcc_unreachable (), 0)]) |
190 | |
191 | #define FLOAT_MODE_FORMAT(MODE) \ |
192 | (REAL_MODE_FORMAT (as_a <scalar_float_mode> (GET_MODE_INNER (MODE)))) |
193 | |
194 | /* The following macro determines whether the floating point format is |
195 | composite, i.e. may contain non-consecutive mantissa bits, in which |
196 | case compile-time FP overflow may not model run-time overflow. */ |
197 | #define MODE_COMPOSITE_P(MODE) \ |
198 | (FLOAT_MODE_P (MODE) \ |
199 | && FLOAT_MODE_FORMAT (MODE)->pnan < FLOAT_MODE_FORMAT (MODE)->p) |
200 | |
201 | /* Accessor macros for format properties. */ |
202 | #define MODE_HAS_NANS(MODE) \ |
203 | (FLOAT_MODE_P (MODE) && FLOAT_MODE_FORMAT (MODE)->has_nans) |
204 | #define MODE_HAS_INFINITIES(MODE) \ |
205 | (FLOAT_MODE_P (MODE) && FLOAT_MODE_FORMAT (MODE)->has_inf) |
206 | #define MODE_HAS_SIGNED_ZEROS(MODE) \ |
207 | (FLOAT_MODE_P (MODE) && FLOAT_MODE_FORMAT (MODE)->has_signed_zero) |
208 | #define MODE_HAS_SIGN_DEPENDENT_ROUNDING(MODE) \ |
209 | (FLOAT_MODE_P (MODE) \ |
210 | && FLOAT_MODE_FORMAT (MODE)->has_sign_dependent_rounding) |
211 | |
212 | /* This class allows functions in this file to accept a floating-point |
213 | format as either a mode or an explicit real_format pointer. In the |
214 | former case the mode must be VOIDmode (which means "no particular |
215 | format") or must satisfy SCALAR_FLOAT_MODE_P. */ |
216 | class format_helper |
217 | { |
218 | public: |
219 | format_helper (const real_format *format) : m_format (format) {} |
220 | template<typename T> format_helper (const T &); |
221 | const real_format *operator-> () const { return m_format; } |
222 | operator const real_format *() const { return m_format; } |
223 | |
224 | bool decimal_p () const { return m_format && m_format->b == 10; } |
225 | bool can_represent_integral_type_p (tree type) const; |
226 | |
227 | private: |
228 | const real_format *m_format; |
229 | }; |
230 | |
231 | template<typename T> |
232 | inline format_helper::format_helper (const T &m) |
233 | : m_format (m == VOIDmode ? 0 : REAL_MODE_FORMAT (m)) |
234 | {} |
235 | |
236 | /* Declare functions in real.cc. */ |
237 | |
238 | /* True if the given mode has a NaN representation and the treatment of |
239 | NaN operands is important. Certain optimizations, such as folding |
240 | x * 0 into 0, are not correct for NaN operands, and are normally |
241 | disabled for modes with NaNs. The user can ask for them to be |
242 | done anyway using the -funsafe-math-optimizations switch. */ |
243 | extern bool HONOR_NANS (machine_mode); |
244 | extern bool HONOR_NANS (const_tree); |
245 | extern bool HONOR_NANS (const_rtx); |
246 | |
247 | /* Like HONOR_NANs, but true if we honor signaling NaNs (or sNaNs). */ |
248 | extern bool HONOR_SNANS (machine_mode); |
249 | extern bool HONOR_SNANS (const_tree); |
250 | extern bool HONOR_SNANS (const_rtx); |
251 | |
252 | /* As for HONOR_NANS, but true if the mode can represent infinity and |
253 | the treatment of infinite values is important. */ |
254 | extern bool HONOR_INFINITIES (machine_mode); |
255 | extern bool HONOR_INFINITIES (const_tree); |
256 | extern bool HONOR_INFINITIES (const_rtx); |
257 | |
258 | /* Like HONOR_NANS, but true if the given mode distinguishes between |
259 | positive and negative zero, and the sign of zero is important. */ |
260 | extern bool HONOR_SIGNED_ZEROS (machine_mode); |
261 | extern bool HONOR_SIGNED_ZEROS (const_tree); |
262 | extern bool HONOR_SIGNED_ZEROS (const_rtx); |
263 | |
264 | /* Like HONOR_NANS, but true if given mode supports sign-dependent rounding, |
265 | and the rounding mode is important. */ |
266 | extern bool HONOR_SIGN_DEPENDENT_ROUNDING (machine_mode); |
267 | extern bool HONOR_SIGN_DEPENDENT_ROUNDING (const_tree); |
268 | extern bool HONOR_SIGN_DEPENDENT_ROUNDING (const_rtx); |
269 | |
270 | /* Binary or unary arithmetic on tree_code. */ |
271 | extern bool real_arithmetic (REAL_VALUE_TYPE *, int, const REAL_VALUE_TYPE *, |
272 | const REAL_VALUE_TYPE *); |
273 | |
274 | /* Compare reals by tree_code. */ |
275 | extern bool real_compare (int, const REAL_VALUE_TYPE *, const REAL_VALUE_TYPE *); |
276 | |
277 | /* Determine whether a floating-point value X is infinite. */ |
278 | extern bool real_isinf (const REAL_VALUE_TYPE *); |
279 | |
280 | /* Determine whether a floating-point value X is a NaN. */ |
281 | extern bool real_isnan (const REAL_VALUE_TYPE *); |
282 | |
283 | /* Determine whether a floating-point value X is a signaling NaN. */ |
284 | extern bool real_issignaling_nan (const REAL_VALUE_TYPE *); |
285 | |
286 | /* Determine whether a floating-point value X is finite. */ |
287 | extern bool real_isfinite (const REAL_VALUE_TYPE *); |
288 | |
289 | /* Determine whether a floating-point value X is negative. */ |
290 | extern bool real_isneg (const REAL_VALUE_TYPE *); |
291 | |
292 | /* Determine whether a floating-point value X is minus zero. */ |
293 | extern bool real_isnegzero (const REAL_VALUE_TYPE *); |
294 | |
295 | /* Test relationships between reals. */ |
296 | extern bool real_identical (const REAL_VALUE_TYPE *, const REAL_VALUE_TYPE *); |
297 | extern bool real_equal (const REAL_VALUE_TYPE *, const REAL_VALUE_TYPE *); |
298 | extern bool real_less (const REAL_VALUE_TYPE *, const REAL_VALUE_TYPE *); |
299 | |
300 | /* Extend or truncate to a new format. */ |
301 | extern void real_convert (REAL_VALUE_TYPE *, format_helper, |
302 | const REAL_VALUE_TYPE *); |
303 | |
304 | /* Return true if truncating to NEW is exact. */ |
305 | extern bool exact_real_truncate (format_helper, const REAL_VALUE_TYPE *); |
306 | |
307 | /* Render R as a decimal floating point constant. */ |
308 | extern void real_to_decimal (char *, const REAL_VALUE_TYPE *, size_t, |
309 | size_t, int); |
310 | |
311 | /* Render R as a decimal floating point constant, rounded so as to be |
312 | parsed back to the same value when interpreted in mode MODE. */ |
313 | extern void real_to_decimal_for_mode (char *, const REAL_VALUE_TYPE *, size_t, |
314 | size_t, int, machine_mode); |
315 | |
316 | /* Render R as a hexadecimal floating point constant. */ |
317 | extern void real_to_hexadecimal (char *, const REAL_VALUE_TYPE *, |
318 | size_t, size_t, int); |
319 | |
320 | /* Render R as an integer. */ |
321 | extern HOST_WIDE_INT real_to_integer (const REAL_VALUE_TYPE *); |
322 | |
323 | /* Initialize R from a decimal or hexadecimal string. Return -1 if |
324 | the value underflows, +1 if overflows, and 0 otherwise. */ |
325 | extern int real_from_string (REAL_VALUE_TYPE *, const char *); |
326 | /* Wrapper to allow different internal representation for decimal floats. */ |
327 | extern void real_from_string3 (REAL_VALUE_TYPE *, const char *, format_helper); |
328 | |
329 | extern long real_to_target (long *, const REAL_VALUE_TYPE *, format_helper); |
330 | |
331 | extern void real_from_target (REAL_VALUE_TYPE *, const long *, |
332 | format_helper); |
333 | |
334 | extern void real_inf (REAL_VALUE_TYPE *); |
335 | |
336 | extern bool real_nan (REAL_VALUE_TYPE *, const char *, int, format_helper); |
337 | |
338 | extern void real_maxval (REAL_VALUE_TYPE *, int, machine_mode); |
339 | |
340 | extern void real_2expN (REAL_VALUE_TYPE *, int, format_helper); |
341 | |
342 | extern unsigned int real_hash (const REAL_VALUE_TYPE *); |
343 | |
344 | |
345 | /* Target formats defined in real.cc. */ |
346 | extern const struct real_format ieee_single_format; |
347 | extern const struct real_format mips_single_format; |
348 | extern const struct real_format motorola_single_format; |
349 | extern const struct real_format spu_single_format; |
350 | extern const struct real_format ieee_double_format; |
351 | extern const struct real_format mips_double_format; |
352 | extern const struct real_format motorola_double_format; |
353 | extern const struct real_format ieee_extended_motorola_format; |
354 | extern const struct real_format ieee_extended_intel_96_format; |
355 | extern const struct real_format ieee_extended_intel_96_round_53_format; |
356 | extern const struct real_format ieee_extended_intel_128_format; |
357 | extern const struct real_format ibm_extended_format; |
358 | extern const struct real_format mips_extended_format; |
359 | extern const struct real_format ieee_quad_format; |
360 | extern const struct real_format mips_quad_format; |
361 | extern const struct real_format vax_f_format; |
362 | extern const struct real_format vax_d_format; |
363 | extern const struct real_format vax_g_format; |
364 | extern const struct real_format real_internal_format; |
365 | extern const struct real_format decimal_single_format; |
366 | extern const struct real_format decimal_double_format; |
367 | extern const struct real_format decimal_quad_format; |
368 | extern const struct real_format ieee_half_format; |
369 | extern const struct real_format arm_half_format; |
370 | extern const struct real_format arm_bfloat_half_format; |
371 | |
372 | |
373 | /* ====================================================================== */ |
374 | /* Crap. */ |
375 | |
376 | /* Determine whether a floating-point value X is infinite. */ |
377 | #define REAL_VALUE_ISINF(x) real_isinf (&(x)) |
378 | |
379 | /* Determine whether a floating-point value X is a NaN. */ |
380 | #define REAL_VALUE_ISNAN(x) real_isnan (&(x)) |
381 | |
382 | /* Determine whether a floating-point value X is a signaling NaN. */ |
383 | #define REAL_VALUE_ISSIGNALING_NAN(x) real_issignaling_nan (&(x)) |
384 | |
385 | /* Determine whether a floating-point value X is negative. */ |
386 | #define REAL_VALUE_NEGATIVE(x) real_isneg (&(x)) |
387 | |
388 | /* Determine whether a floating-point value X is minus zero. */ |
389 | #define REAL_VALUE_MINUS_ZERO(x) real_isnegzero (&(x)) |
390 | |
391 | /* IN is a REAL_VALUE_TYPE. OUT is an array of longs. */ |
392 | #define REAL_VALUE_TO_TARGET_LONG_DOUBLE(IN, OUT) \ |
393 | real_to_target (OUT, &(IN), \ |
394 | float_mode_for_size (LONG_DOUBLE_TYPE_SIZE).require ()) |
395 | |
396 | #define REAL_VALUE_TO_TARGET_DOUBLE(IN, OUT) \ |
397 | real_to_target (OUT, &(IN), float_mode_for_size (64).require ()) |
398 | |
399 | /* IN is a REAL_VALUE_TYPE. OUT is a long. */ |
400 | #define REAL_VALUE_TO_TARGET_SINGLE(IN, OUT) \ |
401 | ((OUT) = real_to_target (NULL, &(IN), float_mode_for_size (32).require ())) |
402 | |
403 | /* Real values to IEEE 754 decimal floats. */ |
404 | |
405 | /* IN is a REAL_VALUE_TYPE. OUT is an array of longs. */ |
406 | #define REAL_VALUE_TO_TARGET_DECIMAL128(IN, OUT) \ |
407 | real_to_target (OUT, &(IN), decimal_float_mode_for_size (128).require ()) |
408 | |
409 | #define REAL_VALUE_TO_TARGET_DECIMAL64(IN, OUT) \ |
410 | real_to_target (OUT, &(IN), decimal_float_mode_for_size (64).require ()) |
411 | |
412 | /* IN is a REAL_VALUE_TYPE. OUT is a long. */ |
413 | #define REAL_VALUE_TO_TARGET_DECIMAL32(IN, OUT) \ |
414 | ((OUT) = real_to_target (NULL, &(IN), \ |
415 | decimal_float_mode_for_size (32).require ())) |
416 | |
417 | extern REAL_VALUE_TYPE real_value_truncate (format_helper, REAL_VALUE_TYPE); |
418 | |
419 | extern REAL_VALUE_TYPE real_value_negate (const REAL_VALUE_TYPE *); |
420 | extern REAL_VALUE_TYPE real_value_abs (const REAL_VALUE_TYPE *); |
421 | |
422 | extern int significand_size (format_helper); |
423 | |
424 | extern REAL_VALUE_TYPE real_from_string2 (const char *, format_helper); |
425 | |
426 | #define REAL_VALUE_ATOF(s, m) \ |
427 | real_from_string2 (s, m) |
428 | |
429 | #define CONST_DOUBLE_ATOF(s, m) \ |
430 | const_double_from_real_value (real_from_string2 (s, m), m) |
431 | |
432 | #define REAL_VALUE_FIX(r) \ |
433 | real_to_integer (&(r)) |
434 | |
435 | /* ??? Not quite right. */ |
436 | #define REAL_VALUE_UNSIGNED_FIX(r) \ |
437 | real_to_integer (&(r)) |
438 | |
439 | /* ??? These were added for Paranoia support. */ |
440 | |
441 | /* Return floor log2(R). */ |
442 | extern int real_exponent (const REAL_VALUE_TYPE *); |
443 | |
444 | /* R = A * 2**EXP. */ |
445 | extern void real_ldexp (REAL_VALUE_TYPE *, const REAL_VALUE_TYPE *, int); |
446 | |
447 | /* **** End of software floating point emulator interface macros **** */ |
448 | |
449 | /* Constant real values 0, 1, 2, -1 and 0.5. */ |
450 | |
451 | extern REAL_VALUE_TYPE dconst0; |
452 | extern REAL_VALUE_TYPE dconst1; |
453 | extern REAL_VALUE_TYPE dconst2; |
454 | extern REAL_VALUE_TYPE dconstm1; |
455 | extern REAL_VALUE_TYPE dconsthalf; |
456 | |
457 | #define dconst_e() (*dconst_e_ptr ()) |
458 | #define dconst_third() (*dconst_third_ptr ()) |
459 | #define dconst_quarter() (*dconst_quarter_ptr ()) |
460 | #define dconst_sixth() (*dconst_sixth_ptr ()) |
461 | #define dconst_ninth() (*dconst_ninth_ptr ()) |
462 | #define dconst_sqrt2() (*dconst_sqrt2_ptr ()) |
463 | |
464 | /* Function to return the real value special constant 'e'. */ |
465 | extern const REAL_VALUE_TYPE * dconst_e_ptr (void); |
466 | |
467 | /* Returns a cached REAL_VALUE_TYPE corresponding to 1/n, for various n. */ |
468 | extern const REAL_VALUE_TYPE *dconst_third_ptr (void); |
469 | extern const REAL_VALUE_TYPE *dconst_quarter_ptr (void); |
470 | extern const REAL_VALUE_TYPE *dconst_sixth_ptr (void); |
471 | extern const REAL_VALUE_TYPE *dconst_ninth_ptr (void); |
472 | |
473 | /* Returns the special REAL_VALUE_TYPE corresponding to sqrt(2). */ |
474 | extern const REAL_VALUE_TYPE * dconst_sqrt2_ptr (void); |
475 | |
476 | /* Function to return a real value (not a tree node) |
477 | from a given integer constant. */ |
478 | REAL_VALUE_TYPE real_value_from_int_cst (const_tree, const_tree); |
479 | |
480 | /* Return a CONST_DOUBLE with value R and mode M. */ |
481 | extern rtx const_double_from_real_value (REAL_VALUE_TYPE, machine_mode); |
482 | |
483 | /* Replace R by 1/R in the given format, if the result is exact. */ |
484 | extern bool exact_real_inverse (format_helper, REAL_VALUE_TYPE *); |
485 | |
486 | /* Return true if arithmetic on values in IMODE that were promoted |
487 | from values in TMODE is equivalent to direct arithmetic on values |
488 | in TMODE. */ |
489 | bool real_can_shorten_arithmetic (machine_mode, machine_mode); |
490 | |
491 | /* In tree.cc: wrap up a REAL_VALUE_TYPE in a tree node. */ |
492 | extern tree build_real (tree, REAL_VALUE_TYPE); |
493 | |
494 | /* Likewise, but first truncate the value to the type. */ |
495 | extern tree build_real_truncate (tree, REAL_VALUE_TYPE); |
496 | |
497 | /* Calculate R as X raised to the integer exponent N in format FMT. */ |
498 | extern bool real_powi (REAL_VALUE_TYPE *, format_helper, |
499 | const REAL_VALUE_TYPE *, HOST_WIDE_INT); |
500 | |
501 | /* Standard round to integer value functions. */ |
502 | extern void real_trunc (REAL_VALUE_TYPE *, format_helper, |
503 | const REAL_VALUE_TYPE *); |
504 | extern void real_floor (REAL_VALUE_TYPE *, format_helper, |
505 | const REAL_VALUE_TYPE *); |
506 | extern void real_ceil (REAL_VALUE_TYPE *, format_helper, |
507 | const REAL_VALUE_TYPE *); |
508 | extern void real_round (REAL_VALUE_TYPE *, format_helper, |
509 | const REAL_VALUE_TYPE *); |
510 | extern void real_roundeven (REAL_VALUE_TYPE *, format_helper, |
511 | const REAL_VALUE_TYPE *); |
512 | |
513 | /* Set the sign of R to the sign of X. */ |
514 | extern void real_copysign (REAL_VALUE_TYPE *, const REAL_VALUE_TYPE *); |
515 | |
516 | /* Check whether the real constant value given is an integer. */ |
517 | extern bool real_isinteger (const REAL_VALUE_TYPE *, format_helper); |
518 | extern bool real_isinteger (const REAL_VALUE_TYPE *, HOST_WIDE_INT *); |
519 | |
520 | /* Calculate nextafter (X, Y) in format FMT. */ |
521 | extern bool real_nextafter (REAL_VALUE_TYPE *, format_helper, |
522 | const REAL_VALUE_TYPE *, const REAL_VALUE_TYPE *); |
523 | |
524 | /* Write into BUF the maximum representable finite floating-point |
525 | number, (1 - b**-p) * b**emax for a given FP format FMT as a hex |
526 | float string. BUF must be large enough to contain the result. */ |
527 | extern void get_max_float (const struct real_format *, char *, size_t, bool); |
528 | |
529 | #ifndef GENERATOR_FILE |
530 | /* real related routines. */ |
531 | extern wide_int real_to_integer (const REAL_VALUE_TYPE *, bool *, int); |
532 | extern void real_from_integer (REAL_VALUE_TYPE *, format_helper, |
533 | const wide_int_ref &, signop); |
534 | #endif |
535 | |
536 | /* Fills r with the largest value such that 1 + r*r won't overflow. |
537 | This is used in both sin (atan (x)) and cos (atan(x)) optimizations. */ |
538 | extern void build_sinatan_real (REAL_VALUE_TYPE *, tree); |
539 | |
540 | #endif /* ! GCC_REAL_H */ |
541 | |