gcc/real.h

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