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