gcc/real.h

   1 /* Definitions of floating-point access for GNU compiler.
   2    Copyright (C) 1989, 1991, 1994, 1996, 1997, 1998,
   3    1999, 2000, 2002 Free Software Foundation, Inc.
   4
   5 This file is part of GCC.
   6
   7 GCC is free software; you can redistribute it and/or modify it under
   8 the terms of the GNU General Public License as published by the Free
   9 Software Foundation; either version 2, or (at your option) any later
  10 version.
  11
  12 GCC is distributed in the hope that it will be useful, but WITHOUT ANY
  13 WARRANTY; without even the implied warranty of MERCHANTABILITY or
  14 FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  15 for more details.
  16
  17 You should have received a copy of the GNU General Public License
  18 along with GCC; see the file COPYING.  If not, write to the Free
  19 Software Foundation, 59 Temple Place - Suite 330, Boston, MA
  20 02111-1307, USA.  */
  21
  22 #ifndef GCC_REAL_H
  23 #define GCC_REAL_H
  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 #ifndef INTEL_EXTENDED_IEEE_FORMAT
  43 #define INTEL_EXTENDED_IEEE_FORMAT 0
  44 #endif
  45
  46 #if TARGET_FLOAT_FORMAT == IEEE_FLOAT_FORMAT
  47 #define REAL_INFINITY
  48 #endif
  49
  50 /* If FLOAT_WORDS_BIG_ENDIAN and HOST_FLOAT_WORDS_BIG_ENDIAN are not defined
  51    in the header files, then this implies the word-endianness is the same as
  52    for integers.  */
  53
  54 /* This is defined 0 or 1, like WORDS_BIG_ENDIAN.  */
  55 #ifndef FLOAT_WORDS_BIG_ENDIAN
  56 #define FLOAT_WORDS_BIG_ENDIAN WORDS_BIG_ENDIAN
  57 #endif
  58
  59 /* This is defined 0 or 1, unlike HOST_WORDS_BIG_ENDIAN.  */
  60 #ifndef HOST_FLOAT_WORDS_BIG_ENDIAN
  61 #ifdef HOST_WORDS_BIG_ENDIAN
  62 #define HOST_FLOAT_WORDS_BIG_ENDIAN 1
  63 #else
  64 #define HOST_FLOAT_WORDS_BIG_ENDIAN 0
  65 #endif
  66 #endif
  67
  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
  80 /* **** Start of software floating point emulator interface macros **** */
  81
  82 /* Support 80-bit extended real XFmode if LONG_DOUBLE_TYPE_SIZE
  83    has been defined to be 96 in the tm.h machine file.  */
  84 #if (MAX_LONG_DOUBLE_TYPE_SIZE == 96)
  85 #define REAL_IS_NOT_DOUBLE
  86 typedef struct {
  87   HOST_WIDE_INT r[(11 + sizeof (HOST_WIDE_INT))/(sizeof (HOST_WIDE_INT))];
  88 } realvaluetype;
  89 #define REAL_VALUE_TYPE realvaluetype
  90
  91 #else /* no XFmode support */
  92
  93 #if (MAX_LONG_DOUBLE_TYPE_SIZE == 128)
  94
  95 #define REAL_IS_NOT_DOUBLE
  96 typedef struct {
  97   HOST_WIDE_INT r[(19 + sizeof (HOST_WIDE_INT))/(sizeof (HOST_WIDE_INT))];
  98 } realvaluetype;
  99 #define REAL_VALUE_TYPE realvaluetype
 100
 101 #else /* not TFmode */
 102
 103 #if HOST_FLOAT_FORMAT != TARGET_FLOAT_FORMAT
 104 /* If no XFmode support, then a REAL_VALUE_TYPE is 64 bits wide
 105    but it is not necessarily a host machine double.  */
 106 #define REAL_IS_NOT_DOUBLE
 107 typedef struct {
 108   HOST_WIDE_INT r[(7 + sizeof (HOST_WIDE_INT))/(sizeof (HOST_WIDE_INT))];
 109 } realvaluetype;
 110 #define REAL_VALUE_TYPE realvaluetype
 111 #else
 112 /* If host and target formats are compatible, then a REAL_VALUE_TYPE
 113    is actually a host machine double.  */
 114 #define REAL_VALUE_TYPE double
 115 #endif
 116
 117 #endif /* no TFmode support */
 118 #endif /* no XFmode support */
 119
 120 extern unsigned int significand_size    PARAMS ((enum machine_mode));
 121
 122 #define REAL_ARITHMETIC(value, code, d1, d2) \
 123   earith (&(value), (code), &(d1), &(d2))
 124
 125 /* Declare functions in real.c.  */
 126 extern void earith              PARAMS ((REAL_VALUE_TYPE *, int,
 127                                        REAL_VALUE_TYPE *, REAL_VALUE_TYPE *));
 128 extern REAL_VALUE_TYPE etrunci  PARAMS ((REAL_VALUE_TYPE));
 129 extern REAL_VALUE_TYPE etruncui PARAMS ((REAL_VALUE_TYPE));
 130 extern REAL_VALUE_TYPE ereal_negate PARAMS ((REAL_VALUE_TYPE));
 131 extern HOST_WIDE_INT efixi      PARAMS ((REAL_VALUE_TYPE));
 132 extern unsigned HOST_WIDE_INT efixui PARAMS ((REAL_VALUE_TYPE));
 133 extern void ereal_from_int      PARAMS ((REAL_VALUE_TYPE *,
 134                                        HOST_WIDE_INT, HOST_WIDE_INT,
 135                                        enum machine_mode));
 136 extern void ereal_from_uint     PARAMS ((REAL_VALUE_TYPE *,
 137                                        unsigned HOST_WIDE_INT,
 138                                        unsigned HOST_WIDE_INT,
 139                                        enum machine_mode));
 140 extern void ereal_to_int        PARAMS ((HOST_WIDE_INT *, HOST_WIDE_INT *,
 141                                        REAL_VALUE_TYPE));
 142 extern REAL_VALUE_TYPE ereal_ldexp PARAMS ((REAL_VALUE_TYPE, int));
 143
 144 extern void etartdouble         PARAMS ((REAL_VALUE_TYPE, long *));
 145 extern void etarldouble         PARAMS ((REAL_VALUE_TYPE, long *));
 146 extern void etardouble          PARAMS ((REAL_VALUE_TYPE, long *));
 147 extern long etarsingle          PARAMS ((REAL_VALUE_TYPE));
 148 extern void ereal_to_decimal    PARAMS ((REAL_VALUE_TYPE, char *));
 149 extern int ereal_cmp            PARAMS ((REAL_VALUE_TYPE, REAL_VALUE_TYPE));
 150 extern int ereal_isneg          PARAMS ((REAL_VALUE_TYPE));
 151 extern REAL_VALUE_TYPE ereal_unto_float PARAMS ((long));
 152 extern REAL_VALUE_TYPE ereal_unto_double PARAMS ((long *));
 153 extern REAL_VALUE_TYPE ereal_from_float PARAMS ((HOST_WIDE_INT));
 154 extern REAL_VALUE_TYPE ereal_from_double PARAMS ((HOST_WIDE_INT *));
 155
 156 #define REAL_VALUES_EQUAL(x, y) (ereal_cmp ((x), (y)) == 0)
 157 /* true if x < y : */
 158 #define REAL_VALUES_LESS(x, y) (ereal_cmp ((x), (y)) == -1)
 159 #define REAL_VALUE_LDEXP(x, n) ereal_ldexp (x, n)
 160
 161 /* Compare two floating-point objects for bitwise identity.
 162    This is not the same as comparing for equality on IEEE hosts:
 163    -0.0 equals 0.0 but they are not identical, and conversely
 164    two NaNs might be identical but they cannot be equal.  */
 165 #define REAL_VALUES_IDENTICAL(x, y) \
 166   (!memcmp ((char *) &(x), (char *) &(y), sizeof (REAL_VALUE_TYPE)))
 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
 172 /* Truncate the floating-point value X to mode MODE.  */
 173 #define REAL_VALUE_TRUNCATE(mode, x)  real_value_truncate (mode, x)
 174 extern REAL_VALUE_TYPE real_value_truncate PARAMS ((enum machine_mode,
 175                                                  REAL_VALUE_TYPE));
 176
 177 /* These return HOST_WIDE_INT: */
 178 /* Convert a floating-point value to integer, rounding toward zero.  */
 179 #define REAL_VALUE_FIX(x) (efixi (x))
 180 /* Convert a floating-point value to unsigned integer, rounding
 181    toward zero.  */
 182 #define REAL_VALUE_UNSIGNED_FIX(x) (efixui (x))
 183
 184 /* Convert ASCII string S to floating point in mode M.
 185    Decimal input uses ATOF.  Hexadecimal uses HTOF.  */
 186 #define REAL_VALUE_ATOF(s,m) ereal_atof(s,m)
 187 #define REAL_VALUE_HTOF(s,m) ereal_atof(s,m)
 188
 189 #define REAL_VALUE_NEGATE ereal_negate
 190
 191 /* Determine whether a floating-point value X is infinite.  */
 192 #define REAL_VALUE_ISINF(x) (target_isinf (x))
 193
 194 /* Determine whether a floating-point value X is a NaN.  */
 195 #define REAL_VALUE_ISNAN(x) (target_isnan (x))
 196
 197 /* Determine whether a floating-point value X is negative.  */
 198 #define REAL_VALUE_NEGATIVE(x) (target_negative (x))
 199
 200 /* Determine whether a floating-point value X is minus zero.  */
 201 #define REAL_VALUE_MINUS_ZERO(x) \
 202  ((ereal_cmp (x, dconst0) == 0) && (ereal_isneg (x) != 0 ))
 203
 204 #define REAL_VALUE_TO_INT ereal_to_int
 205
 206 /* Here the cast to HOST_WIDE_INT sign-extends arguments such as ~0.  */
 207 #define REAL_VALUE_FROM_INT(d, lo, hi, mode) \
 208   ereal_from_int (&d, (HOST_WIDE_INT) (lo), (HOST_WIDE_INT) (hi), mode)
 209
 210 #define REAL_VALUE_FROM_UNSIGNED_INT(d, lo, hi, mode) \
 211   ereal_from_uint (&d, lo, hi, mode)
 212
 213 /* IN is a REAL_VALUE_TYPE.  OUT is an array of longs.  */
 214 #define REAL_VALUE_TO_TARGET_LONG_DOUBLE(IN, OUT)               \
 215    (LONG_DOUBLE_TYPE_SIZE == 64 ? etardouble ((IN), (OUT))      \
 216     : LONG_DOUBLE_TYPE_SIZE == 96 ? etarldouble ((IN), (OUT))   \
 217     : LONG_DOUBLE_TYPE_SIZE == 128 ? etartdouble ((IN), (OUT))  \
 218     : abort ())
 219 #define REAL_VALUE_TO_TARGET_DOUBLE(IN, OUT) (etardouble ((IN), (OUT)))
 220
 221 /* IN is a REAL_VALUE_TYPE.  OUT is a long.  */
 222 #define REAL_VALUE_TO_TARGET_SINGLE(IN, OUT) ((OUT) = etarsingle ((IN)))
 223
 224 /* Inverse of REAL_VALUE_TO_TARGET_DOUBLE.  */
 225 #define REAL_VALUE_UNTO_TARGET_DOUBLE(d)  (ereal_unto_double (d))
 226
 227 /* Inverse of REAL_VALUE_TO_TARGET_SINGLE.  */
 228 #define REAL_VALUE_UNTO_TARGET_SINGLE(f)  (ereal_unto_float (f))
 229
 230 /* d is an array of HOST_WIDE_INT that holds a double precision
 231    value in the target computer's floating point format.  */
 232 #define REAL_VALUE_FROM_TARGET_DOUBLE(d)  (ereal_from_double (d))
 233
 234 /* f is a HOST_WIDE_INT containing a single precision target float value.  */
 235 #define REAL_VALUE_FROM_TARGET_SINGLE(f)  (ereal_from_float (f))
 236
 237 /* Conversions to decimal ASCII string.  */
 238 #define REAL_VALUE_TO_DECIMAL(r, fmt, s) (ereal_to_decimal (r, s))
 239
 240 /* **** End of software floating point emulator interface macros **** */
 241 \f
 242 /* Constant real values 0, 1, 2, and -1.  */
 243
 244 extern REAL_VALUE_TYPE dconst0;
 245 extern REAL_VALUE_TYPE dconst1;
 246 extern REAL_VALUE_TYPE dconst2;
 247 extern REAL_VALUE_TYPE dconstm1;
 248
 249 /* Union type used for extracting real values from CONST_DOUBLEs
 250    or putting them in.  */
 251
 252 union real_extract
 253 {
 254   REAL_VALUE_TYPE d;
 255   HOST_WIDE_INT i[sizeof (REAL_VALUE_TYPE) / sizeof (HOST_WIDE_INT)];
 256 };
 257
 258 /* Given a CONST_DOUBLE in FROM, store into TO the value it represents.  */
 259 /* Function to return a real value (not a tree node)
 260    from a given integer constant.  */
 261 union tree_node;
 262 REAL_VALUE_TYPE real_value_from_int_cst PARAMS ((union tree_node *,
 263                                                 union tree_node *));
 264
 265 #define REAL_VALUE_FROM_CONST_DOUBLE(to, from)          \
 266 do { union real_extract u;                              \
 267      memcpy (&u, &CONST_DOUBLE_LOW ((from)), sizeof u); \
 268      to = u.d; } while (0)
 269
 270 /* Return a CONST_DOUBLE with value R and mode M.  */
 271
 272 #define CONST_DOUBLE_FROM_REAL_VALUE(r, m) immed_real_const_1 (r,  m)
 273 extern struct rtx_def *immed_real_const_1       PARAMS ((REAL_VALUE_TYPE,
 274                                                        enum machine_mode));
 275
 276 /* Replace R by 1/R in the given machine mode, if the result is exact.  */
 277 extern int exact_real_inverse   PARAMS ((enum machine_mode, REAL_VALUE_TYPE *));
 278 extern int target_isnan         PARAMS ((REAL_VALUE_TYPE));
 279 extern int target_isinf         PARAMS ((REAL_VALUE_TYPE));
 280 extern int target_negative      PARAMS ((REAL_VALUE_TYPE));
 281 extern void debug_real          PARAMS ((REAL_VALUE_TYPE));
 282 extern REAL_VALUE_TYPE ereal_atof PARAMS ((const char *, enum machine_mode));
 283
 284 #endif /* ! GCC_REAL_H */