gcc/real.h

   1 /* Front-end tree definitions for GNU compiler.
   2    Copyright (C) 1989, 1991 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, 675 Mass Ave, Cambridge, MA 02139, USA.  */
  19
  20 #ifndef REAL_H_INCLUDED
  21 #define REAL_H_INCLUDED
  22
  23 /* Define codes for all the float formats that we know of.  */
  24 #define UNKNOWN_FLOAT_FORMAT 0
  25 #define IEEE_FLOAT_FORMAT 1
  26 #define VAX_FLOAT_FORMAT 2
  27 #define IBM_FLOAT_FORMAT 3
  28
  29 /* Default to IEEE float if not specified.  Nearly all machines use it.  */
  30
  31 #ifndef TARGET_FLOAT_FORMAT
  32 #define TARGET_FLOAT_FORMAT     IEEE_FLOAT_FORMAT
  33 #endif
  34
  35 #ifndef HOST_FLOAT_FORMAT
  36 #define HOST_FLOAT_FORMAT       IEEE_FLOAT_FORMAT
  37 #endif
  38
  39 #if TARGET_FLOAT_FORMAT == IEEE_FLOAT_FORMAT
  40 #define REAL_INFINITY
  41 #endif
  42
  43 /* Defining REAL_ARITHMETIC invokes a floating point emulator
  44    that can produce a target machine format differing by more
  45    than just endian-ness from the host's format.  The emulator
  46    is also used to support extended real XFmode.  */
  47 #ifndef LONG_DOUBLE_TYPE_SIZE
  48 #define LONG_DOUBLE_TYPE_SIZE 64
  49 #endif
  50 #if (LONG_DOUBLE_TYPE_SIZE == 96) || (LONG_DOUBLE_TYPE_SIZE == 128)
  51 #ifndef REAL_ARITHMETIC
  52 #define REAL_ARITHMETIC
  53 #endif
  54 #endif
  55 #ifdef REAL_ARITHMETIC
  56 /* **** Start of software floating point emulator interface macros **** */
  57
  58 /* Support 80-bit extended real XFmode if LONG_DOUBLE_TYPE_SIZE
  59    has been defined to be 96 in the tm.h machine file. */
  60 #if (LONG_DOUBLE_TYPE_SIZE == 96)
  61 #define REAL_IS_NOT_DOUBLE
  62 #define REAL_ARITHMETIC
  63 typedef struct {
  64   HOST_WIDE_INT r[(11 + sizeof (HOST_WIDE_INT))/(sizeof (HOST_WIDE_INT))];
  65 } realvaluetype;
  66 #define REAL_VALUE_TYPE realvaluetype
  67
  68 #else /* no XFmode support */
  69
  70 #if (LONG_DOUBLE_TYPE_SIZE == 128)
  71
  72 #define REAL_IS_NOT_DOUBLE
  73 #define REAL_ARITHMETIC
  74 typedef struct {
  75   HOST_WIDE_INT r[(19 + sizeof (HOST_WIDE_INT))/(sizeof (HOST_WIDE_INT))];
  76 } realvaluetype;
  77 #define REAL_VALUE_TYPE realvaluetype
  78
  79 #else /* not TFmode */
  80
  81 #if HOST_FLOAT_FORMAT != TARGET_FLOAT_FORMAT
  82 /* If no XFmode support, then a REAL_VALUE_TYPE is 64 bits wide
  83    but it is not necessarily a host machine double. */
  84 #define REAL_IS_NOT_DOUBLE
  85 typedef struct {
  86   HOST_WIDE_INT r[(7 + sizeof (HOST_WIDE_INT))/(sizeof (HOST_WIDE_INT))];
  87 } realvaluetype;
  88 #define REAL_VALUE_TYPE realvaluetype
  89 #else
  90 /* If host and target formats are compatible, then a REAL_VALUE_TYPE
  91    is actually a host machine double. */
  92 #define REAL_VALUE_TYPE double
  93 #endif
  94
  95 #endif /* no TFmode support */
  96 #endif /* no XFmode support */
  97
  98 /* If emulation has been enabled by defining REAL_ARITHMETIC or by
  99    setting LONG_DOUBLE_TYPE_SIZE to 96 or 128, then define macros so that
 100    they invoke emulator functions. This will succeed only if the machine
 101    files have been updated to use these macros in place of any
 102    references to host machine `double' or `float' types.  */
 103 #ifdef REAL_ARITHMETIC
 104 #undef REAL_ARITHMETIC
 105 #define REAL_ARITHMETIC(value, code, d1, d2) \
 106   earith (&(value), (code), &(d1), &(d2))
 107
 108 /* Declare functions in real.c that are referenced here. */
 109 void earith (), ereal_from_uint (), ereal_from_int (), ereal_to_int ();
 110 void etarldouble (), etartdouble (), etardouble ();
 111 long etarsingle (), efixi ();
 112 unsigned long efixui ();
 113 int ereal_cmp (), ereal_isneg ();
 114 unsigned int eroundui ();
 115 REAL_VALUE_TYPE etrunci (), etruncui (), ereal_ldexp (), ereal_atof ();
 116 REAL_VALUE_TYPE ereal_negate (), ereal_truncate ();
 117 REAL_VALUE_TYPE ereal_from_float (), ereal_from_double ();
 118
 119 #define REAL_VALUES_EQUAL(x, y) (ereal_cmp ((x), (y)) == 0)
 120 /* true if x < y : */
 121 #define REAL_VALUES_LESS(x, y) (ereal_cmp ((x), (y)) == -1)
 122 #define REAL_VALUE_LDEXP(x, n) ereal_ldexp (x, n)
 123
 124 /* These return REAL_VALUE_TYPE: */
 125 #define REAL_VALUE_RNDZINT(x) (etrunci (x))
 126 #define REAL_VALUE_UNSIGNED_RNDZINT(x) (etruncui (x))
 127 extern REAL_VALUE_TYPE real_value_truncate ();
 128 #define REAL_VALUE_TRUNCATE(mode, x)  real_value_truncate (mode, x)
 129
 130 /* These return int: */
 131 /* Convert a floating-point value to integer, rounding toward zero.  */
 132 #define REAL_VALUE_FIX(x) (efixi (x))
 133 /* Convert a floating-point value to unsigned integer, rounding
 134    toward zero. */
 135 #define REAL_VALUE_UNSIGNED_FIX(x) (efixui (x))
 136
 137 #define REAL_VALUE_ATOF ereal_atof
 138 #define REAL_VALUE_NEGATE ereal_negate
 139
 140 #define REAL_VALUE_MINUS_ZERO(x) \
 141  ((ereal_cmp (x, dconst0) == 0) && (ereal_isneg (x) != 0 ))
 142
 143 #define REAL_VALUE_TO_INT ereal_to_int
 144 #define REAL_VALUE_FROM_INT(d, i, j) (ereal_from_int (&d, i, j))
 145 #define REAL_VALUE_FROM_UNSIGNED_INT(d, i, j) (ereal_from_uint (&d, i, j))
 146
 147 /* IN is a REAL_VALUE_TYPE.  OUT is an array of longs. */
 148 #if LONG_DOUBLE_TYPE_SIZE == 96
 149 #define REAL_VALUE_TO_TARGET_LONG_DOUBLE(IN, OUT) (etarldouble ((IN), (OUT)))
 150 #else
 151 #define REAL_VALUE_TO_TARGET_LONG_DOUBLE(IN, OUT) (etartdouble ((IN), (OUT)))
 152 #endif
 153 #define REAL_VALUE_TO_TARGET_DOUBLE(IN, OUT) (etardouble ((IN), (OUT)))
 154
 155 /* IN is a REAL_VALUE_TYPE.  OUT is a long. */
 156 #define REAL_VALUE_TO_TARGET_SINGLE(IN, OUT) ((OUT) = etarsingle ((IN)))
 157
 158 /* d is an array of longs. */
 159 #define REAL_VALUE_FROM_TARGET_DOUBLE(d)  (ereal_from_double (d))
 160
 161 /* f is a long. */
 162 #define REAL_VALUE_FROM_TARGET_SINGLE(f)  (ereal_from_float (f))
 163
 164 /* Conversions to decimal ASCII string.  */
 165 #define REAL_VALUE_TO_DECIMAL(r, fmt, s) (ereal_to_decimal (r, s))
 166
 167 #endif /* REAL_ARITHMETIC defined */
 168
 169 /* **** End of software floating point emulator interface macros **** */
 170 #else /* No XFmode or TFmode and REAL_ARITHMETIC not defined */
 171
 172 /* old interface */
 173 #ifdef REAL_ARITHMETIC
 174 /* Defining REAL_IS_NOT_DOUBLE breaks certain initializations
 175    when REAL_ARITHMETIC etc. are not defined.  */
 176
 177 /* Now see if the host and target machines use the same format.
 178    If not, define REAL_IS_NOT_DOUBLE (even if we end up representing
 179    reals as doubles because we have no better way in this cross compiler.)
 180    This turns off various optimizations that can happen when we know the
 181    compiler's float format matches the target's float format.
 182    */
 183 #if HOST_FLOAT_FORMAT != TARGET_FLOAT_FORMAT
 184 #define REAL_IS_NOT_DOUBLE
 185 #ifndef REAL_VALUE_TYPE
 186 typedef struct {
 187     HOST_WIDE_INT r[sizeof (double)/sizeof (HOST_WIDE_INT)];
 188   } realvaluetype;
 189 #define REAL_VALUE_TYPE realvaluetype
 190 #endif /* no REAL_VALUE_TYPE */
 191 #endif /* formats differ */
 192 #endif /* 0 */
 193
 194 #endif /* emulator not used */
 195
 196 /* If we are not cross-compiling, use a `double' to represent the
 197    floating-point value.  Otherwise, use some other type
 198    (probably a struct containing an array of longs).  */
 199 #ifndef REAL_VALUE_TYPE
 200 #define REAL_VALUE_TYPE double
 201 #else
 202 #define REAL_IS_NOT_DOUBLE
 203 #endif
 204
 205 #if HOST_FLOAT_FORMAT == TARGET_FLOAT_FORMAT
 206
 207 /* Convert a type `double' value in host format first to a type `float'
 208    value in host format and then to a single type `long' value which
 209    is the bitwise equivalent of the `float' value.  */
 210 #ifndef REAL_VALUE_TO_TARGET_SINGLE
 211 #define REAL_VALUE_TO_TARGET_SINGLE(IN, OUT)                            \
 212 do { float f = (float) (IN);                                            \
 213      (OUT) = *(long *) &f;                                              \
 214    } while (0)
 215 #endif
 216
 217 /* Convert a type `double' value in host format to a pair of type `long'
 218    values which is its bitwise equivalent, but put the two words into
 219    proper word order for the target.  */
 220 #ifndef REAL_VALUE_TO_TARGET_DOUBLE
 221 #if defined (HOST_WORDS_BIG_ENDIAN) == WORDS_BIG_ENDIAN
 222 #define REAL_VALUE_TO_TARGET_DOUBLE(IN, OUT)                            \
 223 do { REAL_VALUE_TYPE in = (IN);  /* Make sure it's not in a register.  */\
 224      (OUT)[0] = ((long *) &in)[0];                                      \
 225      (OUT)[1] = ((long *) &in)[1];                                      \
 226    } while (0)
 227 #else
 228 #define REAL_VALUE_TO_TARGET_DOUBLE(IN, OUT)                            \
 229 do { REAL_VALUE_TYPE in = (IN);  /* Make sure it's not in a register.  */\
 230      (OUT)[1] = ((long *) &in)[0];                                      \
 231      (OUT)[0] = ((long *) &in)[1];                                      \
 232    } while (0)
 233 #endif
 234 #endif
 235 #endif /* HOST_FLOAT_FORMAT == TARGET_FLOAT_FORMAT */
 236
 237 /* In this configuration, double and long double are the same. */
 238 #ifndef REAL_VALUE_TO_TARGET_LONG_DOUBLE
 239 #define REAL_VALUE_TO_TARGET_LONG_DOUBLE(a, b) REAL_VALUE_TO_TARGET_DOUBLE (a, b)
 240 #endif
 241
 242 /* Compare two floating-point values for equality.  */
 243 #ifndef REAL_VALUES_EQUAL
 244 #define REAL_VALUES_EQUAL(x, y) ((x) == (y))
 245 #endif
 246
 247 /* Compare two floating-point values for less than.  */
 248 #ifndef REAL_VALUES_LESS
 249 #define REAL_VALUES_LESS(x, y) ((x) < (y))
 250 #endif
 251
 252 /* Truncate toward zero to an integer floating-point value.  */
 253 #ifndef REAL_VALUE_RNDZINT
 254 #define REAL_VALUE_RNDZINT(x) ((double) ((int) (x)))
 255 #endif
 256
 257 /* Truncate toward zero to an unsigned integer floating-point value.  */
 258 #ifndef REAL_VALUE_UNSIGNED_RNDZINT
 259 #define REAL_VALUE_UNSIGNED_RNDZINT(x) ((double) ((unsigned int) (x)))
 260 #endif
 261
 262 /* Convert a floating-point value to integer, rounding toward zero.  */
 263 #ifndef REAL_VALUE_FIX
 264 #define REAL_VALUE_FIX(x) ((int) (x))
 265 #endif
 266
 267 /* Convert a floating-point value to unsigned integer, rounding
 268    toward zero. */
 269 #ifndef REAL_VALUE_UNSIGNED_FIX
 270 #define REAL_VALUE_UNSIGNED_FIX(x) ((unsigned int) (x))
 271 #endif
 272
 273 /* Scale X by Y powers of 2.  */
 274 #ifndef REAL_VALUE_LDEXP
 275 #define REAL_VALUE_LDEXP(x, y) ldexp (x, y)
 276 extern double ldexp ();
 277 #endif
 278
 279 /* Convert the string X to a floating-point value.  */
 280 #ifndef REAL_VALUE_ATOF
 281 #if 1
 282 /* Use real.c to convert decimal numbers to binary, ... */
 283 REAL_VALUE_TYPE ereal_atof ();
 284 #define REAL_VALUE_ATOF(x, s) ereal_atof (x, s)
 285 #else
 286 /* ... or, if you like the host computer's atof, go ahead and use it: */
 287 #define REAL_VALUE_ATOF(x, s) atof (x)
 288 #if defined (MIPSEL) || defined (MIPSEB)
 289 /* MIPS compiler can't handle parens around the function name.
 290    This problem *does not* appear to be connected with any
 291    macro definition for atof.  It does not seem there is one.  */
 292 extern double atof ();
 293 #else
 294 extern double (atof) ();
 295 #endif
 296 #endif
 297 #endif
 298
 299 /* Negate the floating-point value X.  */
 300 #ifndef REAL_VALUE_NEGATE
 301 #define REAL_VALUE_NEGATE(x) (- (x))
 302 #endif
 303
 304 /* Truncate the floating-point value X to mode MODE.  This is correct only
 305    for the most common case where the host and target have objects of the same
 306    size and where `float' is SFmode.  */
 307
 308 /* Don't use REAL_VALUE_TRUNCATE directly--always call real_value_truncate.  */
 309 extern REAL_VALUE_TYPE real_value_truncate ();
 310
 311 #ifndef REAL_VALUE_TRUNCATE
 312 #define REAL_VALUE_TRUNCATE(mode, x) \
 313  (GET_MODE_BITSIZE (mode) == sizeof (float) * HOST_BITS_PER_CHAR        \
 314   ? (float) (x) : (x))
 315 #endif
 316
 317 /* Determine whether a floating-point value X is infinite. */
 318 #ifndef REAL_VALUE_ISINF
 319 #define REAL_VALUE_ISINF(x) (target_isinf (x))
 320 #endif
 321
 322 /* Determine whether a floating-point value X is a NaN. */
 323 #ifndef REAL_VALUE_ISNAN
 324 #define REAL_VALUE_ISNAN(x) (target_isnan (x))
 325 #endif
 326
 327 /* Determine whether a floating-point value X is negative. */
 328 #ifndef REAL_VALUE_NEGATIVE
 329 #define REAL_VALUE_NEGATIVE(x) (target_negative (x))
 330 #endif
 331
 332 /* Determine whether a floating-point value X is minus 0. */
 333 #ifndef REAL_VALUE_MINUS_ZERO
 334 #define REAL_VALUE_MINUS_ZERO(x) ((x) == 0 && REAL_VALUE_NEGATIVE (x))
 335 #endif
 336 \f
 337 /* Constant real values 0, 1, 2, and -1.  */
 338
 339 extern REAL_VALUE_TYPE dconst0;
 340 extern REAL_VALUE_TYPE dconst1;
 341 extern REAL_VALUE_TYPE dconst2;
 342 extern REAL_VALUE_TYPE dconstm1;
 343
 344 /* Union type used for extracting real values from CONST_DOUBLEs
 345    or putting them in.  */
 346
 347 union real_extract
 348 {
 349   REAL_VALUE_TYPE d;
 350   HOST_WIDE_INT i[sizeof (REAL_VALUE_TYPE) / sizeof (HOST_WIDE_INT)];
 351 };
 352
 353 /* For a CONST_DOUBLE:
 354    The usual two ints that hold the value.
 355    For a DImode, that is all there are;
 356     and CONST_DOUBLE_LOW is the low-order word and ..._HIGH the high-order.
 357    For a float, the number of ints varies,
 358     and CONST_DOUBLE_LOW is the one that should come first *in memory*.
 359     So use &CONST_DOUBLE_LOW(r) as the address of an array of ints.  */
 360 #define CONST_DOUBLE_LOW(r) XWINT (r, 2)
 361 #define CONST_DOUBLE_HIGH(r) XWINT (r, 3)
 362
 363 /* Link for chain of all CONST_DOUBLEs in use in current function.  */
 364 #define CONST_DOUBLE_CHAIN(r) XEXP (r, 1)
 365 /* The MEM which represents this CONST_DOUBLE's value in memory,
 366    or const0_rtx if no MEM has been made for it yet,
 367    or cc0_rtx if it is not on the chain.  */
 368 #define CONST_DOUBLE_MEM(r) XEXP (r, 0)
 369
 370 /* Function to return a real value (not a tree node)
 371    from a given integer constant.  */
 372 REAL_VALUE_TYPE real_value_from_int_cst ();
 373
 374 /* Given a CONST_DOUBLE in FROM, store into TO the value it represents.  */
 375
 376 #define REAL_VALUE_FROM_CONST_DOUBLE(to, from)          \
 377 do { union real_extract u;                              \
 378      bcopy (&CONST_DOUBLE_LOW ((from)), &u, sizeof u);  \
 379      to = u.d; } while (0)
 380
 381 /* Return a CONST_DOUBLE with value R and mode M.  */
 382
 383 #define CONST_DOUBLE_FROM_REAL_VALUE(r, m) immed_real_const_1 (r,  m)
 384
 385 /* Convert a floating point value `r', that can be interpreted
 386    as a host machine float or double, to a decimal ASCII string `s'
 387    using printf format string `fmt'.  */
 388 #ifndef REAL_VALUE_TO_DECIMAL
 389 #define REAL_VALUE_TO_DECIMAL(r, fmt, s) (sprintf (s, fmt, r))
 390 #endif
 391
 392 #endif /* Not REAL_H_INCLUDED */