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