gcc/real.h

   1 /* Definitions of floating-point access for GNU compiler.
   2    Copyright (C) 1989, 1991, 1994, 1996, 1997, 1998,
   3    1999, 2000 Free Software Foundation, Inc.
   4
   5 This file is part of GNU CC.
   6
   7 GNU CC is free software; you can redistribute it and/or modify
   8 it under the terms of the GNU General Public License as published by
   9 the Free Software Foundation; either version 2, or (at your option)
  10 any later version.
  11
  12 GNU CC is distributed in the hope that it will be useful,
  13 but WITHOUT ANY WARRANTY; without even the implied warranty of
  14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15 GNU General Public License for more details.
  16
  17 You should have received a copy of the GNU General Public License
  18 along with GNU CC; see the file COPYING.  If not, write to
  19 the Free Software Foundation, 59 Temple Place - Suite 330,
  20 Boston, MA 02111-1307, USA.  */
  21
  22 #ifndef REAL_H_INCLUDED
  23 #define REAL_H_INCLUDED
  24
  25 /* Define codes for all the float formats that we know of.  */
  26 #define UNKNOWN_FLOAT_FORMAT 0
  27 #define IEEE_FLOAT_FORMAT 1
  28 #define VAX_FLOAT_FORMAT 2
  29 #define IBM_FLOAT_FORMAT 3
  30 #define C4X_FLOAT_FORMAT 4
  31
  32 /* Default to IEEE float if not specified.  Nearly all machines use it.  */
  33
  34 #ifndef TARGET_FLOAT_FORMAT
  35 #define TARGET_FLOAT_FORMAT     IEEE_FLOAT_FORMAT
  36 #endif
  37
  38 #ifndef HOST_FLOAT_FORMAT
  39 #define HOST_FLOAT_FORMAT       IEEE_FLOAT_FORMAT
  40 #endif
  41
  42 #if TARGET_FLOAT_FORMAT == IEEE_FLOAT_FORMAT
  43 #define REAL_INFINITY
  44 #endif
  45
  46 /* If FLOAT_WORDS_BIG_ENDIAN and HOST_FLOAT_WORDS_BIG_ENDIAN are not defined
  47    in the header files, then this implies the word-endianness is the same as
  48    for integers.  */
  49
  50 /* This is defined 0 or 1, like WORDS_BIG_ENDIAN.  */
  51 #ifndef FLOAT_WORDS_BIG_ENDIAN
  52 #define FLOAT_WORDS_BIG_ENDIAN WORDS_BIG_ENDIAN
  53 #endif
  54
  55 /* This is defined 0 or 1, unlike HOST_WORDS_BIG_ENDIAN.  */
  56 #ifndef HOST_FLOAT_WORDS_BIG_ENDIAN
  57 #ifdef HOST_WORDS_BIG_ENDIAN
  58 #define HOST_FLOAT_WORDS_BIG_ENDIAN 1
  59 #else
  60 #define HOST_FLOAT_WORDS_BIG_ENDIAN 0
  61 #endif
  62 #endif
  63
  64 /* Defining REAL_ARITHMETIC invokes a floating point emulator
  65    that can produce a target machine format differing by more
  66    than just endian-ness from the host's format.  The emulator
  67    is also used to support extended real XFmode.  */
  68 #ifndef LONG_DOUBLE_TYPE_SIZE
  69 #define LONG_DOUBLE_TYPE_SIZE 64
  70 #endif
  71 /* MAX_LONG_DOUBLE_TYPE_SIZE is a constant tested by #if.
  72    LONG_DOUBLE_TYPE_SIZE can vary at compiler run time.
  73    So long as macros like REAL_VALUE_TO_TARGET_LONG_DOUBLE cannot
  74    vary too, however, then XFmode and TFmode long double
  75    cannot both be supported at the same time.  */
  76 #ifndef MAX_LONG_DOUBLE_TYPE_SIZE
  77 #define MAX_LONG_DOUBLE_TYPE_SIZE LONG_DOUBLE_TYPE_SIZE
  78 #endif
  79 #if (MAX_LONG_DOUBLE_TYPE_SIZE == 96) || (MAX_LONG_DOUBLE_TYPE_SIZE == 128)
  80 #ifndef REAL_ARITHMETIC
  81 #define REAL_ARITHMETIC
  82 #endif
  83 #endif
  84 #ifdef REAL_ARITHMETIC
  85 /* **** Start of software floating point emulator interface macros **** */
  86
  87 /* Support 80-bit extended real XFmode if LONG_DOUBLE_TYPE_SIZE
  88    has been defined to be 96 in the tm.h machine file. */
  89 #if (MAX_LONG_DOUBLE_TYPE_SIZE == 96)
  90 #define REAL_IS_NOT_DOUBLE
  91 #define REAL_ARITHMETIC
  92 typedef struct {
  93   HOST_WIDE_INT r[(11 + sizeof (HOST_WIDE_INT))/(sizeof (HOST_WIDE_INT))];
  94 } realvaluetype;
  95 #define REAL_VALUE_TYPE realvaluetype
  96
  97 #else /* no XFmode support */
  98
  99 #if (MAX_LONG_DOUBLE_TYPE_SIZE == 128)
 100
 101 #define REAL_IS_NOT_DOUBLE
 102 #define REAL_ARITHMETIC
 103 typedef struct {
 104   HOST_WIDE_INT r[(19 + sizeof (HOST_WIDE_INT))/(sizeof (HOST_WIDE_INT))];
 105 } realvaluetype;
 106 #define REAL_VALUE_TYPE realvaluetype
 107
 108 #else /* not TFmode */
 109
 110 #if HOST_FLOAT_FORMAT != TARGET_FLOAT_FORMAT
 111 /* If no XFmode support, then a REAL_VALUE_TYPE is 64 bits wide
 112    but it is not necessarily a host machine double. */
 113 #define REAL_IS_NOT_DOUBLE
 114 typedef struct {
 115   HOST_WIDE_INT r[(7 + sizeof (HOST_WIDE_INT))/(sizeof (HOST_WIDE_INT))];
 116 } realvaluetype;
 117 #define REAL_VALUE_TYPE realvaluetype
 118 #else
 119 /* If host and target formats are compatible, then a REAL_VALUE_TYPE
 120    is actually a host machine double. */
 121 #define REAL_VALUE_TYPE double
 122 #endif
 123
 124 #endif /* no TFmode support */
 125 #endif /* no XFmode support */
 126
 127 extern unsigned int significand_size    PARAMS ((enum machine_mode));
 128
 129 /* If emulation has been enabled by defining REAL_ARITHMETIC or by
 130    setting LONG_DOUBLE_TYPE_SIZE to 96 or 128, then define macros so that
 131    they invoke emulator functions. This will succeed only if the machine
 132    files have been updated to use these macros in place of any
 133    references to host machine `double' or `float' types.  */
 134 #ifdef REAL_ARITHMETIC
 135 #undef REAL_ARITHMETIC
 136 #define REAL_ARITHMETIC(value, code, d1, d2) \
 137   earith (&(value), (code), &(d1), &(d2))
 138
 139 /* Declare functions in real.c. */
 140 extern void earith              PARAMS ((REAL_VALUE_TYPE *, int,
 141                                        REAL_VALUE_TYPE *, REAL_VALUE_TYPE *));
 142 extern REAL_VALUE_TYPE etrunci  PARAMS ((REAL_VALUE_TYPE));
 143 extern REAL_VALUE_TYPE etruncui PARAMS ((REAL_VALUE_TYPE));
 144 extern REAL_VALUE_TYPE ereal_atof PARAMS ((const char *, enum machine_mode));
 145 extern REAL_VALUE_TYPE ereal_negate PARAMS ((REAL_VALUE_TYPE));
 146 extern HOST_WIDE_INT efixi      PARAMS ((REAL_VALUE_TYPE));
 147 extern unsigned HOST_WIDE_INT efixui PARAMS ((REAL_VALUE_TYPE));
 148 extern void ereal_from_int      PARAMS ((REAL_VALUE_TYPE *,
 149                                        HOST_WIDE_INT, HOST_WIDE_INT,
 150                                        enum machine_mode));
 151 extern void ereal_from_uint     PARAMS ((REAL_VALUE_TYPE *,
 152                                        unsigned HOST_WIDE_INT,
 153                                        unsigned HOST_WIDE_INT,
 154                                        enum machine_mode));
 155 extern void ereal_to_int        PARAMS ((HOST_WIDE_INT *, HOST_WIDE_INT *,
 156                                        REAL_VALUE_TYPE));
 157 extern REAL_VALUE_TYPE ereal_ldexp PARAMS ((REAL_VALUE_TYPE, int));
 158
 159 extern void etartdouble         PARAMS ((REAL_VALUE_TYPE, long *));
 160 extern void etarldouble         PARAMS ((REAL_VALUE_TYPE, long *));
 161 extern void etardouble          PARAMS ((REAL_VALUE_TYPE, long *));
 162 extern long etarsingle          PARAMS ((REAL_VALUE_TYPE));
 163 extern void ereal_to_decimal    PARAMS ((REAL_VALUE_TYPE, char *));
 164 extern int ereal_cmp            PARAMS ((REAL_VALUE_TYPE, REAL_VALUE_TYPE));
 165 extern int ereal_isneg          PARAMS ((REAL_VALUE_TYPE));
 166 extern REAL_VALUE_TYPE ereal_unto_float PARAMS ((long));
 167 extern REAL_VALUE_TYPE ereal_unto_double PARAMS ((long *));
 168 extern REAL_VALUE_TYPE ereal_from_float PARAMS ((HOST_WIDE_INT));
 169 extern REAL_VALUE_TYPE ereal_from_double PARAMS ((HOST_WIDE_INT *));
 170
 171 #define REAL_VALUES_EQUAL(x, y) (ereal_cmp ((x), (y)) == 0)
 172 /* true if x < y : */
 173 #define REAL_VALUES_LESS(x, y) (ereal_cmp ((x), (y)) == -1)
 174 #define REAL_VALUE_LDEXP(x, n) ereal_ldexp (x, n)
 175
 176 /* These return REAL_VALUE_TYPE: */
 177 #define REAL_VALUE_RNDZINT(x) (etrunci (x))
 178 #define REAL_VALUE_UNSIGNED_RNDZINT(x) (etruncui (x))
 179 extern REAL_VALUE_TYPE real_value_truncate      PARAMS ((enum machine_mode,
 180                                                         REAL_VALUE_TYPE));
 181 #define REAL_VALUE_TRUNCATE(mode, x)  real_value_truncate (mode, x)
 182
 183 /* These return HOST_WIDE_INT: */
 184 /* Convert a floating-point value to integer, rounding toward zero.  */
 185 #define REAL_VALUE_FIX(x) (efixi (x))
 186 /* Convert a floating-point value to unsigned integer, rounding
 187    toward zero. */
 188 #define REAL_VALUE_UNSIGNED_FIX(x) (efixui (x))
 189
 190 /* Convert ASCII string S to floating point in mode M.
 191    Decimal input uses ATOF.  Hexadecimal uses HTOF.  */
 192 #define REAL_VALUE_ATOF(s,m) ereal_atof(s,m)
 193 #define REAL_VALUE_HTOF(s,m) ereal_atof(s,m)
 194
 195 #define REAL_VALUE_NEGATE ereal_negate
 196
 197 #define REAL_VALUE_MINUS_ZERO(x) \
 198  ((ereal_cmp (x, dconst0) == 0) && (ereal_isneg (x) != 0 ))
 199
 200 #define REAL_VALUE_TO_INT ereal_to_int
 201
 202 /* Here the cast to HOST_WIDE_INT sign-extends arguments such as ~0.  */
 203 #define REAL_VALUE_FROM_INT(d, lo, hi, mode) \
 204   ereal_from_int (&d, (HOST_WIDE_INT) (lo), (HOST_WIDE_INT) (hi), mode)
 205
 206 #define REAL_VALUE_FROM_UNSIGNED_INT(d, lo, hi, mode) \
 207   ereal_from_uint (&d, lo, hi, mode)
 208
 209 /* IN is a REAL_VALUE_TYPE.  OUT is an array of longs. */
 210 #if MAX_LONG_DOUBLE_TYPE_SIZE == 96
 211 #define REAL_VALUE_TO_TARGET_LONG_DOUBLE(IN, OUT) (etarldouble ((IN), (OUT)))
 212 #else
 213 #define REAL_VALUE_TO_TARGET_LONG_DOUBLE(IN, OUT) (etartdouble ((IN), (OUT)))
 214 #endif
 215 #define REAL_VALUE_TO_TARGET_DOUBLE(IN, OUT) (etardouble ((IN), (OUT)))
 216
 217 /* IN is a REAL_VALUE_TYPE.  OUT is a long. */
 218 #define REAL_VALUE_TO_TARGET_SINGLE(IN, OUT) ((OUT) = etarsingle ((IN)))
 219
 220 /* Inverse of REAL_VALUE_TO_TARGET_DOUBLE. */
 221 #define REAL_VALUE_UNTO_TARGET_DOUBLE(d)  (ereal_unto_double (d))
 222
 223 /* Inverse of REAL_VALUE_TO_TARGET_SINGLE. */
 224 #define REAL_VALUE_UNTO_TARGET_SINGLE(f)  (ereal_unto_float (f))
 225
 226 /* d is an array of HOST_WIDE_INT that holds a double precision
 227    value in the target computer's floating point format. */
 228 #define REAL_VALUE_FROM_TARGET_DOUBLE(d)  (ereal_from_double (d))
 229
 230 /* f is a HOST_WIDE_INT containing a single precision target float value. */
 231 #define REAL_VALUE_FROM_TARGET_SINGLE(f)  (ereal_from_float (f))
 232
 233 /* Conversions to decimal ASCII string.  */
 234 #define REAL_VALUE_TO_DECIMAL(r, fmt, s) (ereal_to_decimal (r, s))
 235
 236 #endif /* REAL_ARITHMETIC defined */
 237
 238 /* **** End of software floating point emulator interface macros **** */
 239 #else /* No XFmode or TFmode and REAL_ARITHMETIC not defined */
 240
 241 /* old interface */
 242 #ifdef REAL_ARITHMETIC
 243 /* Defining REAL_IS_NOT_DOUBLE breaks certain initializations
 244    when REAL_ARITHMETIC etc. are not defined.  */
 245
 246 /* Now see if the host and target machines use the same format.
 247    If not, define REAL_IS_NOT_DOUBLE (even if we end up representing
 248    reals as doubles because we have no better way in this cross compiler.)
 249    This turns off various optimizations that can happen when we know the
 250    compiler's float format matches the target's float format.
 251    */
 252 #if HOST_FLOAT_FORMAT != TARGET_FLOAT_FORMAT
 253 #define REAL_IS_NOT_DOUBLE
 254 #ifndef REAL_VALUE_TYPE
 255 typedef struct {
 256     HOST_WIDE_INT r[sizeof (double)/sizeof (HOST_WIDE_INT)];
 257   } realvaluetype;
 258 #define REAL_VALUE_TYPE realvaluetype
 259 #endif /* no REAL_VALUE_TYPE */
 260 #endif /* formats differ */
 261 #endif /* 0 */
 262
 263 #endif /* emulator not used */
 264
 265 /* If we are not cross-compiling, use a `double' to represent the
 266    floating-point value.  Otherwise, use some other type
 267    (probably a struct containing an array of longs).  */
 268 #ifndef REAL_VALUE_TYPE
 269 #define REAL_VALUE_TYPE double
 270 #else
 271 #define REAL_IS_NOT_DOUBLE
 272 #endif
 273
 274 #if HOST_FLOAT_FORMAT == TARGET_FLOAT_FORMAT
 275
 276 /* Convert a type `double' value in host format first to a type `float'
 277    value in host format and then to a single type `long' value which
 278    is the bitwise equivalent of the `float' value.  */
 279 #ifndef REAL_VALUE_TO_TARGET_SINGLE
 280 #define REAL_VALUE_TO_TARGET_SINGLE(IN, OUT)            \
 281 do {                                                    \
 282   union {                                               \
 283     float f;                                            \
 284     HOST_WIDE_INT l;                                    \
 285   } u;                                                  \
 286   if (sizeof(HOST_WIDE_INT) < sizeof(float))            \
 287     abort();                                            \
 288   u.l = 0;                                              \
 289   u.f = (IN);                                           \
 290   (OUT) = u.l;                                          \
 291 } while (0)
 292 #endif
 293
 294 /* Convert a type `double' value in host format to a pair of type `long'
 295    values which is its bitwise equivalent, but put the two words into
 296    proper word order for the target.  */
 297 #ifndef REAL_VALUE_TO_TARGET_DOUBLE
 298 #define REAL_VALUE_TO_TARGET_DOUBLE(IN, OUT)                            \
 299 do {                                                                    \
 300   union {                                                               \
 301     REAL_VALUE_TYPE f;                                                  \
 302     HOST_WIDE_INT l[2];                                                 \
 303   } u;                                                                  \
 304   if (sizeof(HOST_WIDE_INT) * 2 < sizeof(REAL_VALUE_TYPE))              \
 305     abort();                                                            \
 306   u.l[0] = u.l[1] = 0;                                                  \
 307   u.f = (IN);                                                           \
 308   if (HOST_FLOAT_WORDS_BIG_ENDIAN == FLOAT_WORDS_BIG_ENDIAN)            \
 309     (OUT)[0] = u.l[0], (OUT)[1] = u.l[1];                               \
 310   else                                                                  \
 311     (OUT)[1] = u.l[0], (OUT)[0] = u.l[1];                               \
 312 } while (0)
 313 #endif
 314 #endif /* HOST_FLOAT_FORMAT == TARGET_FLOAT_FORMAT */
 315
 316 /* In this configuration, double and long double are the same. */
 317 #ifndef REAL_VALUE_TO_TARGET_LONG_DOUBLE
 318 #define REAL_VALUE_TO_TARGET_LONG_DOUBLE(a, b) REAL_VALUE_TO_TARGET_DOUBLE (a, b)
 319 #endif
 320
 321 /* Compare two floating-point objects for bitwise identity.
 322    This is not the same as comparing for equality on IEEE hosts:
 323    -0.0 equals 0.0 but they are not identical, and conversely
 324    two NaNs might be identical but they cannot be equal.  */
 325 #define REAL_VALUES_IDENTICAL(x, y) \
 326   (!bcmp ((char *) &(x), (char *) &(y), sizeof (REAL_VALUE_TYPE)))
 327
 328 /* Compare two floating-point values for equality.  */
 329 #ifndef REAL_VALUES_EQUAL
 330 #define REAL_VALUES_EQUAL(x, y) ((x) == (y))
 331 #endif
 332
 333 /* Compare two floating-point values for less than.  */
 334 #ifndef REAL_VALUES_LESS
 335 #define REAL_VALUES_LESS(x, y) ((x) < (y))
 336 #endif
 337
 338 /* Truncate toward zero to an integer floating-point value.  */
 339 #ifndef REAL_VALUE_RNDZINT
 340 #define REAL_VALUE_RNDZINT(x) ((double) ((int) (x)))
 341 #endif
 342
 343 /* Truncate toward zero to an unsigned integer floating-point value.  */
 344 #ifndef REAL_VALUE_UNSIGNED_RNDZINT
 345 #define REAL_VALUE_UNSIGNED_RNDZINT(x) ((double) ((unsigned int) (x)))
 346 #endif
 347
 348 /* Convert a floating-point value to integer, rounding toward zero.  */
 349 #ifndef REAL_VALUE_FIX
 350 #define REAL_VALUE_FIX(x) ((int) (x))
 351 #endif
 352
 353 /* Convert a floating-point value to unsigned integer, rounding
 354    toward zero. */
 355 #ifndef REAL_VALUE_UNSIGNED_FIX
 356 #define REAL_VALUE_UNSIGNED_FIX(x) ((unsigned int) (x))
 357 #endif
 358
 359 /* Scale X by Y powers of 2.  */
 360 #ifndef REAL_VALUE_LDEXP
 361 #define REAL_VALUE_LDEXP(x, y) ldexp (x, y)
 362 extern double ldexp PARAMS ((double, int));
 363 #endif
 364
 365 /* Convert the string X to a floating-point value.  */
 366 #ifndef REAL_VALUE_ATOF
 367 #if 1
 368 /* Use real.c to convert decimal numbers to binary, ... */
 369 extern REAL_VALUE_TYPE ereal_atof PARAMS ((const char *, enum machine_mode));
 370 #define REAL_VALUE_ATOF(x, s) ereal_atof (x, s)
 371 /* Could use ereal_atof here for hexadecimal floats too, but real_hex_to_f
 372    is OK and it uses faster native fp arithmetic.  */
 373 /* #define REAL_VALUE_HTOF(x, s) ereal_atof (x, s) */
 374 #else
 375 /* ... or, if you like the host computer's atof, go ahead and use it: */
 376 #define REAL_VALUE_ATOF(x, s) atof (x)
 377 #if defined (MIPSEL) || defined (MIPSEB)
 378 /* MIPS compiler can't handle parens around the function name.
 379    This problem *does not* appear to be connected with any
 380    macro definition for atof.  It does not seem there is one.  */
 381 extern double atof ();
 382 #else
 383 extern double (atof) ();
 384 #endif
 385 #endif
 386 #endif
 387
 388 /* Hexadecimal floating constant input for use with host computer's
 389    fp arithmetic.  */
 390 #ifndef REAL_VALUE_HTOF
 391 extern REAL_VALUE_TYPE real_hex_to_f PARAMS ((char *, enum machine_mode));
 392 #define REAL_VALUE_HTOF(s,m) real_hex_to_f(s,m)
 393 #endif
 394
 395 /* Negate the floating-point value X.  */
 396 #ifndef REAL_VALUE_NEGATE
 397 #define REAL_VALUE_NEGATE(x) (- (x))
 398 #endif
 399
 400 /* Truncate the floating-point value X to mode MODE.  This is correct only
 401    for the most common case where the host and target have objects of the same
 402    size and where `float' is SFmode.  */
 403
 404 /* Don't use REAL_VALUE_TRUNCATE directly--always call real_value_truncate.  */
 405 extern REAL_VALUE_TYPE real_value_truncate PARAMS ((enum machine_mode,
 406                                                   REAL_VALUE_TYPE));
 407
 408 #ifndef REAL_VALUE_TRUNCATE
 409 #define REAL_VALUE_TRUNCATE(mode, x) \
 410  (GET_MODE_BITSIZE (mode) == sizeof (float) * HOST_BITS_PER_CHAR        \
 411   ? (float) (x) : (x))
 412 #endif
 413
 414 /* Determine whether a floating-point value X is infinite. */
 415 #ifndef REAL_VALUE_ISINF
 416 #define REAL_VALUE_ISINF(x) (target_isinf (x))
 417 #endif
 418
 419 /* Determine whether a floating-point value X is a NaN. */
 420 #ifndef REAL_VALUE_ISNAN
 421 #define REAL_VALUE_ISNAN(x) (target_isnan (x))
 422 #endif
 423
 424 /* Determine whether a floating-point value X is negative. */
 425 #ifndef REAL_VALUE_NEGATIVE
 426 #define REAL_VALUE_NEGATIVE(x) (target_negative (x))
 427 #endif
 428
 429 extern int target_isnan                 PARAMS ((REAL_VALUE_TYPE));
 430 extern int target_isinf                 PARAMS ((REAL_VALUE_TYPE));
 431 extern int target_negative              PARAMS ((REAL_VALUE_TYPE));
 432
 433 /* Determine whether a floating-point value X is minus 0. */
 434 #ifndef REAL_VALUE_MINUS_ZERO
 435 #define REAL_VALUE_MINUS_ZERO(x) ((x) == 0 && REAL_VALUE_NEGATIVE (x))
 436 #endif
 437 \f
 438 /* Constant real values 0, 1, 2, and -1.  */
 439
 440 extern REAL_VALUE_TYPE dconst0;
 441 extern REAL_VALUE_TYPE dconst1;
 442 extern REAL_VALUE_TYPE dconst2;
 443 extern REAL_VALUE_TYPE dconstm1;
 444
 445 /* Union type used for extracting real values from CONST_DOUBLEs
 446    or putting them in.  */
 447
 448 union real_extract
 449 {
 450   REAL_VALUE_TYPE d;
 451   HOST_WIDE_INT i[sizeof (REAL_VALUE_TYPE) / sizeof (HOST_WIDE_INT)];
 452 };
 453
 454 /* For a CONST_DOUBLE:
 455    The usual two ints that hold the value.
 456    For a DImode, that is all there are;
 457     and CONST_DOUBLE_LOW is the low-order word and ..._HIGH the high-order.
 458    For a float, the number of ints varies,
 459     and CONST_DOUBLE_LOW is the one that should come first *in memory*.
 460     So use &CONST_DOUBLE_LOW(r) as the address of an array of ints.  */
 461 #define CONST_DOUBLE_LOW(r) XWINT (r, 2)
 462 #define CONST_DOUBLE_HIGH(r) XWINT (r, 3)
 463
 464 /* Link for chain of all CONST_DOUBLEs in use in current function.  */
 465 #define CONST_DOUBLE_CHAIN(r) X0EXP (r, 1)
 466 /* The MEM which represents this CONST_DOUBLE's value in memory,
 467    or const0_rtx if no MEM has been made for it yet,
 468    or cc0_rtx if it is not on the chain.  */
 469 #define CONST_DOUBLE_MEM(r) XEXP (r, 0)
 470
 471 /* Given a CONST_DOUBLE in FROM, store into TO the value it represents.  */
 472 /* Function to return a real value (not a tree node)
 473    from a given integer constant.  */
 474 union tree_node;
 475 REAL_VALUE_TYPE real_value_from_int_cst PARAMS ((union tree_node *,
 476                                                 union tree_node *));
 477
 478 #define REAL_VALUE_FROM_CONST_DOUBLE(to, from)          \
 479 do { union real_extract u;                              \
 480      bcopy ((char *) &CONST_DOUBLE_LOW ((from)), (char *) &u, sizeof u); \
 481      to = u.d; } while (0)
 482
 483 /* Return a CONST_DOUBLE with value R and mode M.  */
 484
 485 #define CONST_DOUBLE_FROM_REAL_VALUE(r, m) immed_real_const_1 (r,  m)
 486 extern struct rtx_def *immed_real_const_1       PARAMS ((REAL_VALUE_TYPE,
 487                                                        enum machine_mode));
 488
 489
 490 /* Convert a floating point value `r', that can be interpreted
 491    as a host machine float or double, to a decimal ASCII string `s'
 492    using printf format string `fmt'.  */
 493 #ifndef REAL_VALUE_TO_DECIMAL
 494 #define REAL_VALUE_TO_DECIMAL(r, fmt, s) (sprintf (s, fmt, r))
 495 #endif
 496
 497 /* Replace R by 1/R in the given machine mode, if the result is exact.  */
 498 extern int exact_real_inverse   PARAMS ((enum machine_mode, REAL_VALUE_TYPE *));
 499 extern int target_isnan         PARAMS ((REAL_VALUE_TYPE));
 500 extern int target_isinf         PARAMS ((REAL_VALUE_TYPE));
 501 extern int target_negative      PARAMS ((REAL_VALUE_TYPE));
 502 extern void debug_real          PARAMS ((REAL_VALUE_TYPE));
 503
 504 /* In varasm.c */
 505 extern void assemble_real               PARAMS ((REAL_VALUE_TYPE,
 506                                                enum machine_mode));
 507 extern void debug_real                  PARAMS ((REAL_VALUE_TYPE));
 508
 509 /* In varasm.c */
 510 extern void assemble_real               PARAMS ((REAL_VALUE_TYPE,
 511                                                enum machine_mode));
 512 #endif /* Not REAL_H_INCLUDED */