1 /* Definitions of floating-point access for GNU compiler.
2 Copyright (C) 1989, 1991, 1994, 1996, 1997, 1998, 1999,
3 2000, 2002, 2003 Free Software Foundation, Inc.
5 This file is part of GCC.
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
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
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
27 /* An expanded form of the represented number. */
29 /* Enumerate the special cases of numbers that we encounter. */
30 enum real_value_class {
37 #define SIGNIFICAND_BITS (128 + HOST_BITS_PER_LONG)
38 #define EXP_BITS (32 - 5)
39 #define MAX_EXP ((1 << (EXP_BITS - 1)) - 1)
40 #define SIGSZ (SIGNIFICAND_BITS / HOST_BITS_PER_LONG)
41 #define SIG_MSB ((unsigned long)1 << (HOST_BITS_PER_LONG - 1))
43 struct real_value GTY(())
45 ENUM_BITFIELD (real_value_class) class : 2;
46 unsigned int sign : 1;
47 unsigned int signalling : 1;
48 unsigned int canonical : 1;
49 signed int exp : EXP_BITS;
50 unsigned long sig[SIGSZ];
53 /* Various headers condition prototypes on #ifdef REAL_VALUE_TYPE, so it
54 needs to be a macro. We do need to continue to have a structure tag
55 so that other headers can forward declare it. */
56 #define REAL_VALUE_TYPE struct real_value
58 /* We store a REAL_VALUE_TYPE into an rtx, and we do this by putting it in
59 consecutive "w" slots. Moreover, we've got to compute the number of "w"
60 slots at preprocessor time, which means we can't use sizeof. Guess. */
62 #define REAL_VALUE_TYPE_SIZE (SIGNIFICAND_BITS + 32)
64 (REAL_VALUE_TYPE_SIZE/HOST_BITS_PER_WIDE_INT \
65 + (REAL_VALUE_TYPE_SIZE%HOST_BITS_PER_WIDE_INT ? 1 : 0)) /* round up */
67 /* Verify the guess. */
68 extern char test_real_width
69 [sizeof(REAL_VALUE_TYPE) <= REAL_WIDTH*sizeof(HOST_WIDE_INT) ? 1 : -1];
71 /* Calculate the format for CONST_DOUBLE. We need as many slots as
72 are necessary to overlay a REAL_VALUE_TYPE on them. This could be
73 as many as four (32-bit HOST_WIDE_INT, 128-bit REAL_VALUE_TYPE).
75 A number of places assume that there are always at least two 'w'
76 slots in a CONST_DOUBLE, so we provide them even if one would suffice. */
79 # define CONST_DOUBLE_FORMAT "ww"
82 # define CONST_DOUBLE_FORMAT "ww"
85 # define CONST_DOUBLE_FORMAT "www"
88 # define CONST_DOUBLE_FORMAT "wwww"
91 # define CONST_DOUBLE_FORMAT "wwwww"
94 # define CONST_DOUBLE_FORMAT "wwwwww"
96 #error "REAL_WIDTH > 6 not supported"
105 /* Describes the properties of the specific target format in use. */
108 /* Move to and from the target bytes. */
109 void (*encode) (const struct real_format *, long *,
110 const REAL_VALUE_TYPE *);
111 void (*decode) (const struct real_format *, REAL_VALUE_TYPE *,
114 /* The radix of the exponent and digits of the significand. */
120 /* Size of the significand in digits of radix B. */
123 /* Size of the significant of a NaN, in digits of radix B. */
126 /* The minimum negative integer, x, such that b**(x-1) is normalized. */
129 /* The maximum integer, x, such that b**(x-1) is representable. */
132 /* The bit position of the sign bit, or -1 for a complex encoding. */
135 /* Properties of the format. */
139 bool has_signed_zero;
144 /* The target format used for each floating floating point mode.
145 Indexed by MODE - QFmode. */
146 extern const struct real_format *real_format_for_mode[TFmode - QFmode + 1];
148 #define REAL_MODE_FORMAT(MODE) (real_format_for_mode[(MODE) - QFmode])
150 /* Declare functions in real.c. */
152 /* Binary or unary arithmetic on tree_code. */
153 extern void real_arithmetic (REAL_VALUE_TYPE *, int, const REAL_VALUE_TYPE *,
154 const REAL_VALUE_TYPE *);
156 /* Compare reals by tree_code. */
157 extern bool real_compare (int, const REAL_VALUE_TYPE *, const REAL_VALUE_TYPE *);
159 /* Determine whether a floating-point value X is infinite. */
160 extern bool real_isinf (const REAL_VALUE_TYPE *);
162 /* Determine whether a floating-point value X is a NaN. */
163 extern bool real_isnan (const REAL_VALUE_TYPE *);
165 /* Determine whether a floating-point value X is negative. */
166 extern bool real_isneg (const REAL_VALUE_TYPE *);
168 /* Determine whether a floating-point value X is minus zero. */
169 extern bool real_isnegzero (const REAL_VALUE_TYPE *);
171 /* Compare two floating-point objects for bitwise identity. */
172 extern bool real_identical (const REAL_VALUE_TYPE *, const REAL_VALUE_TYPE *);
174 /* Extend or truncate to a new mode. */
175 extern void real_convert (REAL_VALUE_TYPE *, enum machine_mode,
176 const REAL_VALUE_TYPE *);
178 /* Return true if truncating to NEW is exact. */
179 extern bool exact_real_truncate (enum machine_mode, const REAL_VALUE_TYPE *);
181 /* Render R as a decimal floating point constant. */
182 extern void real_to_decimal (char *, const REAL_VALUE_TYPE *, size_t,
185 /* Render R as a hexadecimal floating point constant. */
186 extern void real_to_hexadecimal (char *, const REAL_VALUE_TYPE *,
187 size_t, size_t, int);
189 /* Render R as an integer. */
190 extern HOST_WIDE_INT real_to_integer (const REAL_VALUE_TYPE *);
191 extern void real_to_integer2 (HOST_WIDE_INT *, HOST_WIDE_INT *,
192 const REAL_VALUE_TYPE *);
194 /* Initialize R from a decimal or hexadecimal string. */
195 extern void real_from_string (REAL_VALUE_TYPE *, const char *);
197 /* Initialize R from an integer pair HIGH/LOW. */
198 extern void real_from_integer (REAL_VALUE_TYPE *, enum machine_mode,
199 unsigned HOST_WIDE_INT, HOST_WIDE_INT, int);
201 extern long real_to_target_fmt (long *, const REAL_VALUE_TYPE *,
202 const struct real_format *);
203 extern long real_to_target (long *, const REAL_VALUE_TYPE *, enum machine_mode);
205 extern void real_from_target_fmt (REAL_VALUE_TYPE *, const long *,
206 const struct real_format *);
207 extern void real_from_target (REAL_VALUE_TYPE *, const long *,
210 extern void real_inf (REAL_VALUE_TYPE *);
212 extern bool real_nan (REAL_VALUE_TYPE *, const char *, int, enum machine_mode);
214 extern void real_maxval (REAL_VALUE_TYPE *, int, enum machine_mode);
216 extern void real_2expN (REAL_VALUE_TYPE *, int);
218 extern unsigned int real_hash (const REAL_VALUE_TYPE *);
221 /* Target formats defined in real.c. */
222 extern const struct real_format ieee_single_format;
223 extern const struct real_format mips_single_format;
224 extern const struct real_format ieee_double_format;
225 extern const struct real_format mips_double_format;
226 extern const struct real_format ieee_extended_motorola_format;
227 extern const struct real_format ieee_extended_intel_96_format;
228 extern const struct real_format ieee_extended_intel_96_round_53_format;
229 extern const struct real_format ieee_extended_intel_128_format;
230 extern const struct real_format ibm_extended_format;
231 extern const struct real_format mips_extended_format;
232 extern const struct real_format ieee_quad_format;
233 extern const struct real_format mips_quad_format;
234 extern const struct real_format vax_f_format;
235 extern const struct real_format vax_d_format;
236 extern const struct real_format vax_g_format;
237 extern const struct real_format i370_single_format;
238 extern const struct real_format i370_double_format;
239 extern const struct real_format c4x_single_format;
240 extern const struct real_format c4x_extended_format;
241 extern const struct real_format real_internal_format;
244 /* ====================================================================== */
247 #define REAL_ARITHMETIC(value, code, d1, d2) \
248 real_arithmetic (&(value), code, &(d1), &(d2))
250 #define REAL_VALUES_IDENTICAL(x, y) real_identical (&(x), &(y))
251 #define REAL_VALUES_EQUAL(x, y) real_compare (EQ_EXPR, &(x), &(y))
252 #define REAL_VALUES_LESS(x, y) real_compare (LT_EXPR, &(x), &(y))
254 /* Determine whether a floating-point value X is infinite. */
255 #define REAL_VALUE_ISINF(x) real_isinf (&(x))
257 /* Determine whether a floating-point value X is a NaN. */
258 #define REAL_VALUE_ISNAN(x) real_isnan (&(x))
260 /* Determine whether a floating-point value X is negative. */
261 #define REAL_VALUE_NEGATIVE(x) real_isneg (&(x))
263 /* Determine whether a floating-point value X is minus zero. */
264 #define REAL_VALUE_MINUS_ZERO(x) real_isnegzero (&(x))
266 /* IN is a REAL_VALUE_TYPE. OUT is an array of longs. */
267 #define REAL_VALUE_TO_TARGET_LONG_DOUBLE(IN, OUT) \
268 real_to_target (OUT, &(IN), \
269 mode_for_size (LONG_DOUBLE_TYPE_SIZE, MODE_FLOAT, 0))
271 #define REAL_VALUE_TO_TARGET_DOUBLE(IN, OUT) \
272 real_to_target (OUT, &(IN), mode_for_size (64, MODE_FLOAT, 0))
274 /* IN is a REAL_VALUE_TYPE. OUT is a long. */
275 #define REAL_VALUE_TO_TARGET_SINGLE(IN, OUT) \
276 ((OUT) = real_to_target (NULL, &(IN), mode_for_size (32, MODE_FLOAT, 0)))
278 #define REAL_VALUE_FROM_INT(r, lo, hi, mode) \
279 real_from_integer (&(r), mode, lo, hi, 0)
281 #define REAL_VALUE_FROM_UNSIGNED_INT(r, lo, hi, mode) \
282 real_from_integer (&(r), mode, lo, hi, 1)
284 extern REAL_VALUE_TYPE real_value_truncate (enum machine_mode,
287 #define REAL_VALUE_TO_INT(plow, phigh, r) \
288 real_to_integer2 (plow, phigh, &(r))
290 extern REAL_VALUE_TYPE real_arithmetic2 (int, const REAL_VALUE_TYPE *,
291 const REAL_VALUE_TYPE *);
293 #define REAL_VALUE_NEGATE(X) \
294 real_arithmetic2 (NEGATE_EXPR, &(X), NULL)
296 #define REAL_VALUE_ABS(X) \
297 real_arithmetic2 (ABS_EXPR, &(X), NULL)
299 extern int significand_size (enum machine_mode);
301 extern REAL_VALUE_TYPE real_from_string2 (const char *, enum machine_mode);
303 #define REAL_VALUE_ATOF(s, m) \
304 real_from_string2 (s, m)
306 #define CONST_DOUBLE_ATOF(s, m) \
307 CONST_DOUBLE_FROM_REAL_VALUE (real_from_string2 (s, m), m)
309 #define REAL_VALUE_FIX(r) \
310 real_to_integer (&(r))
312 /* ??? Not quite right. */
313 #define REAL_VALUE_UNSIGNED_FIX(r) \
314 real_to_integer (&(r))
316 /* ??? These were added for Paranoia support. */
318 /* Return floor log2(R). */
319 extern int real_exponent (const REAL_VALUE_TYPE *);
321 /* R = A * 2**EXP. */
322 extern void real_ldexp (REAL_VALUE_TYPE *, const REAL_VALUE_TYPE *, int);
324 /* **** End of software floating point emulator interface macros **** */
326 /* Constant real values 0, 1, 2, 3, 10, -1, -2, 0.5 and 1/3. */
328 extern REAL_VALUE_TYPE dconst0;
329 extern REAL_VALUE_TYPE dconst1;
330 extern REAL_VALUE_TYPE dconst2;
331 extern REAL_VALUE_TYPE dconst3;
332 extern REAL_VALUE_TYPE dconst10;
333 extern REAL_VALUE_TYPE dconstm1;
334 extern REAL_VALUE_TYPE dconstm2;
335 extern REAL_VALUE_TYPE dconsthalf;
336 extern REAL_VALUE_TYPE dconstthird;
337 extern REAL_VALUE_TYPE dconstpi;
338 extern REAL_VALUE_TYPE dconste;
340 /* Function to return a real value (not a tree node)
341 from a given integer constant. */
342 REAL_VALUE_TYPE real_value_from_int_cst (tree, tree);
344 /* Given a CONST_DOUBLE in FROM, store into TO the value it represents. */
345 #define REAL_VALUE_FROM_CONST_DOUBLE(to, from) \
346 memcpy (&(to), &CONST_DOUBLE_LOW ((from)), sizeof (REAL_VALUE_TYPE))
348 /* Return a CONST_DOUBLE with value R and mode M. */
349 #define CONST_DOUBLE_FROM_REAL_VALUE(r, m) \
350 const_double_from_real_value (r, m)
351 extern rtx const_double_from_real_value (REAL_VALUE_TYPE, enum machine_mode);
353 /* Replace R by 1/R in the given machine mode, if the result is exact. */
354 extern bool exact_real_inverse (enum machine_mode, REAL_VALUE_TYPE *);
356 /* In tree.c: wrap up a REAL_VALUE_TYPE in a tree node. */
357 extern tree build_real (tree, REAL_VALUE_TYPE);
359 /* Calculate R as the square root of X in the given machine mode. */
360 extern bool real_sqrt (REAL_VALUE_TYPE *, enum machine_mode,
361 const REAL_VALUE_TYPE *);
363 /* Calculate R as X raised to the integer exponent N in mode MODE. */
364 extern bool real_powi (REAL_VALUE_TYPE *, enum machine_mode,
365 const REAL_VALUE_TYPE *, HOST_WIDE_INT);
367 /* Standard round to integer value functions. */
368 extern void real_trunc (REAL_VALUE_TYPE *, enum machine_mode,
369 const REAL_VALUE_TYPE *);
370 extern void real_floor (REAL_VALUE_TYPE *, enum machine_mode,
371 const REAL_VALUE_TYPE *);
372 extern void real_ceil (REAL_VALUE_TYPE *, enum machine_mode,
373 const REAL_VALUE_TYPE *);
375 #endif /* ! GCC_REAL_H */