OpenCores
URL https://opencores.org/ocsvn/openrisc/openrisc/trunk

Subversion Repositories openrisc

[/] [openrisc/] [trunk/] [gnu-dev/] [or1k-gcc/] [gcc/] [real.h] - Blame information for rev 744

Go to most recent revision | Details | Compare with Previous | View Log

Line No. Rev Author Line
1 684 jeremybenn
/* Definitions of floating-point access for GNU compiler.
2
   Copyright (C) 1989, 1991, 1994, 1996, 1997, 1998, 1999,
3
   2000, 2002, 2003, 2004, 2005, 2007, 2008, 2009, 2010
4
   Free Software Foundation, Inc.
5
 
6
   This file is part of GCC.
7
 
8
   GCC is free software; you can redistribute it and/or modify it under
9
   the terms of the GNU General Public License as published by the Free
10
   Software Foundation; either version 3, or (at your option) any later
11
   version.
12
 
13
   GCC is distributed in the hope that it will be useful, but WITHOUT ANY
14
   WARRANTY; without even the implied warranty of MERCHANTABILITY or
15
   FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
16
   for more details.
17
 
18
   You should have received a copy of the GNU General Public License
19
   along with GCC; see the file COPYING3.  If not see
20
   <http://www.gnu.org/licenses/>.  */
21
 
22
#ifndef GCC_REAL_H
23
#define GCC_REAL_H
24
 
25
#include "machmode.h"
26
 
27
/* An expanded form of the represented number.  */
28
 
29
/* Enumerate the special cases of numbers that we encounter.  */
30
enum real_value_class {
31
  rvc_zero,
32
  rvc_normal,
33
  rvc_inf,
34
  rvc_nan
35
};
36
 
37
#define SIGNIFICAND_BITS        (128 + HOST_BITS_PER_LONG)
38
#define EXP_BITS                (32 - 6)
39
#define MAX_EXP                 ((1 << (EXP_BITS - 1)) - 1)
40
#define SIGSZ                   (SIGNIFICAND_BITS / HOST_BITS_PER_LONG)
41
#define SIG_MSB                 ((unsigned long)1 << (HOST_BITS_PER_LONG - 1))
42
 
43
struct GTY(()) real_value {
44
  /* Use the same underlying type for all bit-fields, so as to make
45
     sure they're packed together, otherwise REAL_VALUE_TYPE_SIZE will
46
     be miscomputed.  */
47
  unsigned int /* ENUM_BITFIELD (real_value_class) */ cl : 2;
48
  unsigned int decimal : 1;
49
  unsigned int sign : 1;
50
  unsigned int signalling : 1;
51
  unsigned int canonical : 1;
52
  unsigned int uexp : EXP_BITS;
53
  unsigned long sig[SIGSZ];
54
};
55
 
56
#define REAL_EXP(REAL) \
57
  ((int)((REAL)->uexp ^ (unsigned int)(1 << (EXP_BITS - 1))) \
58
   - (1 << (EXP_BITS - 1)))
59
#define SET_REAL_EXP(REAL, EXP) \
60
  ((REAL)->uexp = ((unsigned int)(EXP) & (unsigned int)((1 << EXP_BITS) - 1)))
61
 
62
/* Various headers condition prototypes on #ifdef REAL_VALUE_TYPE, so it
63
   needs to be a macro.  We do need to continue to have a structure tag
64
   so that other headers can forward declare it.  */
65
#define REAL_VALUE_TYPE struct real_value
66
 
67
/* We store a REAL_VALUE_TYPE into an rtx, and we do this by putting it in
68
   consecutive "w" slots.  Moreover, we've got to compute the number of "w"
69
   slots at preprocessor time, which means we can't use sizeof.  Guess.  */
70
 
71
#define REAL_VALUE_TYPE_SIZE (SIGNIFICAND_BITS + 32)
72
#define REAL_WIDTH \
73
  (REAL_VALUE_TYPE_SIZE/HOST_BITS_PER_WIDE_INT \
74
   + (REAL_VALUE_TYPE_SIZE%HOST_BITS_PER_WIDE_INT ? 1 : 0)) /* round up */
75
 
76
/* Verify the guess.  */
77
extern char test_real_width
78
  [sizeof(REAL_VALUE_TYPE) <= REAL_WIDTH*sizeof(HOST_WIDE_INT) ? 1 : -1];
79
 
80
/* Calculate the format for CONST_DOUBLE.  We need as many slots as
81
   are necessary to overlay a REAL_VALUE_TYPE on them.  This could be
82
   as many as four (32-bit HOST_WIDE_INT, 128-bit REAL_VALUE_TYPE).
83
 
84
   A number of places assume that there are always at least two 'w'
85
   slots in a CONST_DOUBLE, so we provide them even if one would suffice.  */
86
 
87
#if REAL_WIDTH == 1
88
# define CONST_DOUBLE_FORMAT     "ww"
89
#else
90
# if REAL_WIDTH == 2
91
#  define CONST_DOUBLE_FORMAT    "ww"
92
# else
93
#  if REAL_WIDTH == 3
94
#   define CONST_DOUBLE_FORMAT   "www"
95
#  else
96
#   if REAL_WIDTH == 4
97
#    define CONST_DOUBLE_FORMAT  "wwww"
98
#   else
99
#    if REAL_WIDTH == 5
100
#     define CONST_DOUBLE_FORMAT "wwwww"
101
#    else
102
#     if REAL_WIDTH == 6
103
#      define CONST_DOUBLE_FORMAT "wwwwww"
104
#     else
105
       #error "REAL_WIDTH > 6 not supported"
106
#     endif
107
#    endif
108
#   endif
109
#  endif
110
# endif
111
#endif
112
 
113
 
114
/* Describes the properties of the specific target format in use.  */
115
struct real_format
116
{
117
  /* Move to and from the target bytes.  */
118
  void (*encode) (const struct real_format *, long *,
119
                  const REAL_VALUE_TYPE *);
120
  void (*decode) (const struct real_format *, REAL_VALUE_TYPE *,
121
                  const long *);
122
 
123
  /* The radix of the exponent and digits of the significand.  */
124
  int b;
125
 
126
  /* Size of the significand in digits of radix B.  */
127
  int p;
128
 
129
  /* Size of the significant of a NaN, in digits of radix B.  */
130
  int pnan;
131
 
132
  /* The minimum negative integer, x, such that b**(x-1) is normalized.  */
133
  int emin;
134
 
135
  /* The maximum integer, x, such that b**(x-1) is representable.  */
136
  int emax;
137
 
138
  /* The bit position of the sign bit, for determining whether a value
139
     is positive/negative, or -1 for a complex encoding.  */
140
  int signbit_ro;
141
 
142
  /* The bit position of the sign bit, for changing the sign of a number,
143
     or -1 for a complex encoding.  */
144
  int signbit_rw;
145
 
146
  /* Default rounding mode for operations on this format.  */
147
  bool round_towards_zero;
148
  bool has_sign_dependent_rounding;
149
 
150
  /* Properties of the format.  */
151
  bool has_nans;
152
  bool has_inf;
153
  bool has_denorm;
154
  bool has_signed_zero;
155
  bool qnan_msb_set;
156
  bool canonical_nan_lsbs_set;
157
};
158
 
159
 
160
/* The target format used for each floating point mode.
161
   Float modes are followed by decimal float modes, with entries for
162
   float modes indexed by (MODE - first float mode), and entries for
163
   decimal float modes indexed by (MODE - first decimal float mode) +
164
   the number of float modes.  */
165
extern const struct real_format *
166
  real_format_for_mode[MAX_MODE_FLOAT - MIN_MODE_FLOAT + 1
167
                       + MAX_MODE_DECIMAL_FLOAT - MIN_MODE_DECIMAL_FLOAT + 1];
168
 
169
#define REAL_MODE_FORMAT(MODE)                                          \
170
  (real_format_for_mode[DECIMAL_FLOAT_MODE_P (MODE)                     \
171
                        ? (((MODE) - MIN_MODE_DECIMAL_FLOAT)            \
172
                           + (MAX_MODE_FLOAT - MIN_MODE_FLOAT + 1))     \
173
                        : ((MODE) - MIN_MODE_FLOAT)])
174
 
175
#define FLOAT_MODE_FORMAT(MODE) \
176
  (REAL_MODE_FORMAT (SCALAR_FLOAT_MODE_P (MODE)? (MODE) \
177
                                               : GET_MODE_INNER (MODE)))
178
 
179
/* The following macro determines whether the floating point format is
180
   composite, i.e. may contain non-consecutive mantissa bits, in which
181
   case compile-time FP overflow may not model run-time overflow.  */
182
#define MODE_COMPOSITE_P(MODE) \
183
  (FLOAT_MODE_P (MODE) \
184
   && FLOAT_MODE_FORMAT (MODE)->pnan < FLOAT_MODE_FORMAT (MODE)->p)
185
 
186
/* Accessor macros for format properties.  */
187
#define MODE_HAS_NANS(MODE) \
188
  (FLOAT_MODE_P (MODE) && FLOAT_MODE_FORMAT (MODE)->has_nans)
189
#define MODE_HAS_INFINITIES(MODE) \
190
  (FLOAT_MODE_P (MODE) && FLOAT_MODE_FORMAT (MODE)->has_inf)
191
#define MODE_HAS_SIGNED_ZEROS(MODE) \
192
  (FLOAT_MODE_P (MODE) && FLOAT_MODE_FORMAT (MODE)->has_signed_zero)
193
#define MODE_HAS_SIGN_DEPENDENT_ROUNDING(MODE) \
194
  (FLOAT_MODE_P (MODE) \
195
   && FLOAT_MODE_FORMAT (MODE)->has_sign_dependent_rounding)
196
 
197
/* True if the given mode has a NaN representation and the treatment of
198
   NaN operands is important.  Certain optimizations, such as folding
199
   x * 0 into 0, are not correct for NaN operands, and are normally
200
   disabled for modes with NaNs.  The user can ask for them to be
201
   done anyway using the -funsafe-math-optimizations switch.  */
202
#define HONOR_NANS(MODE) \
203
  (MODE_HAS_NANS (MODE) && !flag_finite_math_only)
204
 
205
/* Like HONOR_NANs, but true if we honor signaling NaNs (or sNaNs).  */
206
#define HONOR_SNANS(MODE) (flag_signaling_nans && HONOR_NANS (MODE))
207
 
208
/* As for HONOR_NANS, but true if the mode can represent infinity and
209
   the treatment of infinite values is important.  */
210
#define HONOR_INFINITIES(MODE) \
211
  (MODE_HAS_INFINITIES (MODE) && !flag_finite_math_only)
212
 
213
/* Like HONOR_NANS, but true if the given mode distinguishes between
214
   positive and negative zero, and the sign of zero is important.  */
215
#define HONOR_SIGNED_ZEROS(MODE) \
216
  (MODE_HAS_SIGNED_ZEROS (MODE) && flag_signed_zeros)
217
 
218
/* Like HONOR_NANS, but true if given mode supports sign-dependent rounding,
219
   and the rounding mode is important.  */
220
#define HONOR_SIGN_DEPENDENT_ROUNDING(MODE) \
221
  (MODE_HAS_SIGN_DEPENDENT_ROUNDING (MODE) && flag_rounding_math)
222
 
223
/* Declare functions in real.c.  */
224
 
225
/* Binary or unary arithmetic on tree_code.  */
226
extern bool real_arithmetic (REAL_VALUE_TYPE *, int, const REAL_VALUE_TYPE *,
227
                             const REAL_VALUE_TYPE *);
228
 
229
/* Compare reals by tree_code.  */
230
extern bool real_compare (int, const REAL_VALUE_TYPE *, const REAL_VALUE_TYPE *);
231
 
232
/* Determine whether a floating-point value X is infinite.  */
233
extern bool real_isinf (const REAL_VALUE_TYPE *);
234
 
235
/* Determine whether a floating-point value X is a NaN.  */
236
extern bool real_isnan (const REAL_VALUE_TYPE *);
237
 
238
/* Determine whether a floating-point value X is finite.  */
239
extern bool real_isfinite (const REAL_VALUE_TYPE *);
240
 
241
/* Determine whether a floating-point value X is negative.  */
242
extern bool real_isneg (const REAL_VALUE_TYPE *);
243
 
244
/* Determine whether a floating-point value X is minus zero.  */
245
extern bool real_isnegzero (const REAL_VALUE_TYPE *);
246
 
247
/* Compare two floating-point objects for bitwise identity.  */
248
extern bool real_identical (const REAL_VALUE_TYPE *, const REAL_VALUE_TYPE *);
249
 
250
/* Extend or truncate to a new mode.  */
251
extern void real_convert (REAL_VALUE_TYPE *, enum machine_mode,
252
                          const REAL_VALUE_TYPE *);
253
 
254
/* Return true if truncating to NEW is exact.  */
255
extern bool exact_real_truncate (enum machine_mode, const REAL_VALUE_TYPE *);
256
 
257
/* Render R as a decimal floating point constant.  */
258
extern void real_to_decimal (char *, const REAL_VALUE_TYPE *, size_t,
259
                             size_t, int);
260
 
261
/* Render R as a decimal floating point constant, rounded so as to be
262
   parsed back to the same value when interpreted in mode MODE.  */
263
extern void real_to_decimal_for_mode (char *, const REAL_VALUE_TYPE *, size_t,
264
                                      size_t, int, enum machine_mode);
265
 
266
/* Render R as a hexadecimal floating point constant.  */
267
extern void real_to_hexadecimal (char *, const REAL_VALUE_TYPE *,
268
                                 size_t, size_t, int);
269
 
270
/* Render R as an integer.  */
271
extern HOST_WIDE_INT real_to_integer (const REAL_VALUE_TYPE *);
272
extern void real_to_integer2 (HOST_WIDE_INT *, HOST_WIDE_INT *,
273
                              const REAL_VALUE_TYPE *);
274
 
275
/* Initialize R from a decimal or hexadecimal string.  Return -1 if
276
   the value underflows, +1 if overflows, and 0 otherwise.  */
277
extern int real_from_string (REAL_VALUE_TYPE *, const char *);
278
/* Wrapper to allow different internal representation for decimal floats. */
279
extern void real_from_string3 (REAL_VALUE_TYPE *, const char *, enum machine_mode);
280
 
281
/* Initialize R from an integer pair HIGH/LOW.  */
282
extern void real_from_integer (REAL_VALUE_TYPE *, enum machine_mode,
283
                               unsigned HOST_WIDE_INT, HOST_WIDE_INT, int);
284
 
285
extern long real_to_target_fmt (long *, const REAL_VALUE_TYPE *,
286
                                const struct real_format *);
287
extern long real_to_target (long *, const REAL_VALUE_TYPE *, enum machine_mode);
288
 
289
extern void real_from_target_fmt (REAL_VALUE_TYPE *, const long *,
290
                                  const struct real_format *);
291
extern void real_from_target (REAL_VALUE_TYPE *, const long *,
292
                              enum machine_mode);
293
 
294
extern void real_inf (REAL_VALUE_TYPE *);
295
 
296
extern bool real_nan (REAL_VALUE_TYPE *, const char *, int, enum machine_mode);
297
 
298
extern void real_maxval (REAL_VALUE_TYPE *, int, enum machine_mode);
299
 
300
extern void real_2expN (REAL_VALUE_TYPE *, int, enum machine_mode);
301
 
302
extern unsigned int real_hash (const REAL_VALUE_TYPE *);
303
 
304
 
305
/* Target formats defined in real.c.  */
306
extern const struct real_format ieee_single_format;
307
extern const struct real_format mips_single_format;
308
extern const struct real_format motorola_single_format;
309
extern const struct real_format spu_single_format;
310
extern const struct real_format ieee_double_format;
311
extern const struct real_format mips_double_format;
312
extern const struct real_format motorola_double_format;
313
extern const struct real_format ieee_extended_motorola_format;
314
extern const struct real_format ieee_extended_intel_96_format;
315
extern const struct real_format ieee_extended_intel_96_round_53_format;
316
extern const struct real_format ieee_extended_intel_128_format;
317
extern const struct real_format ibm_extended_format;
318
extern const struct real_format mips_extended_format;
319
extern const struct real_format ieee_quad_format;
320
extern const struct real_format mips_quad_format;
321
extern const struct real_format vax_f_format;
322
extern const struct real_format vax_d_format;
323
extern const struct real_format vax_g_format;
324
extern const struct real_format real_internal_format;
325
extern const struct real_format decimal_single_format;
326
extern const struct real_format decimal_double_format;
327
extern const struct real_format decimal_quad_format;
328
extern const struct real_format ieee_half_format;
329
extern const struct real_format arm_half_format;
330
 
331
 
332
/* ====================================================================== */
333
/* Crap.  */
334
 
335
#define REAL_ARITHMETIC(value, code, d1, d2) \
336
  real_arithmetic (&(value), code, &(d1), &(d2))
337
 
338
#define REAL_VALUES_IDENTICAL(x, y)     real_identical (&(x), &(y))
339
#define REAL_VALUES_EQUAL(x, y)         real_compare (EQ_EXPR, &(x), &(y))
340
#define REAL_VALUES_LESS(x, y)          real_compare (LT_EXPR, &(x), &(y))
341
 
342
/* Determine whether a floating-point value X is infinite.  */
343
#define REAL_VALUE_ISINF(x)             real_isinf (&(x))
344
 
345
/* Determine whether a floating-point value X is a NaN.  */
346
#define REAL_VALUE_ISNAN(x)             real_isnan (&(x))
347
 
348
/* Determine whether a floating-point value X is negative.  */
349
#define REAL_VALUE_NEGATIVE(x)          real_isneg (&(x))
350
 
351
/* Determine whether a floating-point value X is minus zero.  */
352
#define REAL_VALUE_MINUS_ZERO(x)        real_isnegzero (&(x))
353
 
354
/* IN is a REAL_VALUE_TYPE.  OUT is an array of longs.  */
355
#define REAL_VALUE_TO_TARGET_LONG_DOUBLE(IN, OUT)                       \
356
  real_to_target (OUT, &(IN),                                           \
357
                  mode_for_size (LONG_DOUBLE_TYPE_SIZE, MODE_FLOAT, 0))
358
 
359
#define REAL_VALUE_TO_TARGET_DOUBLE(IN, OUT) \
360
  real_to_target (OUT, &(IN), mode_for_size (64, MODE_FLOAT, 0))
361
 
362
/* IN is a REAL_VALUE_TYPE.  OUT is a long.  */
363
#define REAL_VALUE_TO_TARGET_SINGLE(IN, OUT) \
364
  ((OUT) = real_to_target (NULL, &(IN), mode_for_size (32, MODE_FLOAT, 0)))
365
 
366
#define REAL_VALUE_FROM_INT(r, lo, hi, mode) \
367
  real_from_integer (&(r), mode, lo, hi, 0)
368
 
369
#define REAL_VALUE_FROM_UNSIGNED_INT(r, lo, hi, mode) \
370
  real_from_integer (&(r), mode, lo, hi, 1)
371
 
372
/* Real values to IEEE 754 decimal floats.  */
373
 
374
/* IN is a REAL_VALUE_TYPE.  OUT is an array of longs.  */
375
#define REAL_VALUE_TO_TARGET_DECIMAL128(IN, OUT) \
376
  real_to_target (OUT, &(IN), mode_for_size (128, MODE_DECIMAL_FLOAT, 0))
377
 
378
#define REAL_VALUE_TO_TARGET_DECIMAL64(IN, OUT) \
379
  real_to_target (OUT, &(IN), mode_for_size (64, MODE_DECIMAL_FLOAT, 0))
380
 
381
/* IN is a REAL_VALUE_TYPE.  OUT is a long.  */
382
#define REAL_VALUE_TO_TARGET_DECIMAL32(IN, OUT) \
383
  ((OUT) = real_to_target (NULL, &(IN), mode_for_size (32, MODE_DECIMAL_FLOAT, 0)))
384
 
385
extern REAL_VALUE_TYPE real_value_truncate (enum machine_mode,
386
                                            REAL_VALUE_TYPE);
387
 
388
#define REAL_VALUE_TO_INT(plow, phigh, r) \
389
  real_to_integer2 (plow, phigh, &(r))
390
 
391
extern REAL_VALUE_TYPE real_value_negate (const REAL_VALUE_TYPE *);
392
extern REAL_VALUE_TYPE real_value_abs (const REAL_VALUE_TYPE *);
393
 
394
extern int significand_size (enum machine_mode);
395
 
396
extern REAL_VALUE_TYPE real_from_string2 (const char *, enum machine_mode);
397
 
398
#define REAL_VALUE_ATOF(s, m) \
399
  real_from_string2 (s, m)
400
 
401
#define CONST_DOUBLE_ATOF(s, m) \
402
  CONST_DOUBLE_FROM_REAL_VALUE (real_from_string2 (s, m), m)
403
 
404
#define REAL_VALUE_FIX(r) \
405
  real_to_integer (&(r))
406
 
407
/* ??? Not quite right.  */
408
#define REAL_VALUE_UNSIGNED_FIX(r) \
409
  real_to_integer (&(r))
410
 
411
/* ??? These were added for Paranoia support.  */
412
 
413
/* Return floor log2(R).  */
414
extern int real_exponent (const REAL_VALUE_TYPE *);
415
 
416
/* R = A * 2**EXP.  */
417
extern void real_ldexp (REAL_VALUE_TYPE *, const REAL_VALUE_TYPE *, int);
418
 
419
/* **** End of software floating point emulator interface macros **** */
420
 
421
/* Constant real values 0, 1, 2, -1 and 0.5.  */
422
 
423
extern REAL_VALUE_TYPE dconst0;
424
extern REAL_VALUE_TYPE dconst1;
425
extern REAL_VALUE_TYPE dconst2;
426
extern REAL_VALUE_TYPE dconstm1;
427
extern REAL_VALUE_TYPE dconsthalf;
428
 
429
#define dconst_e()  (*dconst_e_ptr ())
430
#define dconst_third()  (*dconst_third_ptr ())
431
#define dconst_sqrt2()  (*dconst_sqrt2_ptr ())
432
 
433
/* Function to return the real value special constant 'e'.  */
434
extern const REAL_VALUE_TYPE * dconst_e_ptr (void);
435
 
436
/* Returns the special REAL_VALUE_TYPE corresponding to 1/3.  */
437
extern const REAL_VALUE_TYPE * dconst_third_ptr (void);
438
 
439
/* Returns the special REAL_VALUE_TYPE corresponding to sqrt(2).  */
440
extern const REAL_VALUE_TYPE * dconst_sqrt2_ptr (void);
441
 
442
/* Function to return a real value (not a tree node)
443
   from a given integer constant.  */
444
REAL_VALUE_TYPE real_value_from_int_cst (const_tree, const_tree);
445
 
446
/* Given a CONST_DOUBLE in FROM, store into TO the value it represents.  */
447
#define REAL_VALUE_FROM_CONST_DOUBLE(to, from) \
448
  ((to) = *CONST_DOUBLE_REAL_VALUE (from))
449
 
450
/* Return a CONST_DOUBLE with value R and mode M.  */
451
#define CONST_DOUBLE_FROM_REAL_VALUE(r, m) \
452
  const_double_from_real_value (r, m)
453
extern rtx const_double_from_real_value (REAL_VALUE_TYPE, enum machine_mode);
454
 
455
/* Replace R by 1/R in the given machine mode, if the result is exact.  */
456
extern bool exact_real_inverse (enum machine_mode, REAL_VALUE_TYPE *);
457
 
458
/* Return true if arithmetic on values in IMODE that were promoted
459
   from values in TMODE is equivalent to direct arithmetic on values
460
   in TMODE.  */
461
bool real_can_shorten_arithmetic (enum machine_mode, enum machine_mode);
462
 
463
/* In tree.c: wrap up a REAL_VALUE_TYPE in a tree node.  */
464
extern tree build_real (tree, REAL_VALUE_TYPE);
465
 
466
/* Calculate R as the square root of X in the given machine mode.  */
467
extern bool real_sqrt (REAL_VALUE_TYPE *, enum machine_mode,
468
                       const REAL_VALUE_TYPE *);
469
 
470
/* Calculate R as X raised to the integer exponent N in mode MODE.  */
471
extern bool real_powi (REAL_VALUE_TYPE *, enum machine_mode,
472
                       const REAL_VALUE_TYPE *, HOST_WIDE_INT);
473
 
474
/* Standard round to integer value functions.  */
475
extern void real_trunc (REAL_VALUE_TYPE *, enum machine_mode,
476
                        const REAL_VALUE_TYPE *);
477
extern void real_floor (REAL_VALUE_TYPE *, enum machine_mode,
478
                        const REAL_VALUE_TYPE *);
479
extern void real_ceil (REAL_VALUE_TYPE *, enum machine_mode,
480
                       const REAL_VALUE_TYPE *);
481
extern void real_round (REAL_VALUE_TYPE *, enum machine_mode,
482
                        const REAL_VALUE_TYPE *);
483
 
484
/* Set the sign of R to the sign of X.  */
485
extern void real_copysign (REAL_VALUE_TYPE *, const REAL_VALUE_TYPE *);
486
 
487
/* Check whether the real constant value given is an integer.  */
488
extern bool real_isinteger (const REAL_VALUE_TYPE *c, enum machine_mode mode);
489
 
490
/* Write into BUF the maximum representable finite floating-point
491
   number, (1 - b**-p) * b**emax for a given FP format FMT as a hex
492
   float string.  BUF must be large enough to contain the result.  */
493
extern void get_max_float (const struct real_format *, char *, size_t);
494
#endif /* ! GCC_REAL_H */

powered by: WebSVN 2.1.0

© copyright 1999-2024 OpenCores.org, equivalent to Oliscience, all rights reserved. OpenCores®, registered trademark.