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 - 4)
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 signed int exp : EXP_BITS;
49 unsigned long sig[SIGSZ];
52 /* Various headers condition prototypes on #ifdef REAL_VALUE_TYPE, so it
53 needs to be a macro. We do need to continue to have a structure tag
54 so that other headers can forward declare it. */
55 #define REAL_VALUE_TYPE struct real_value
57 /* We store a REAL_VALUE_TYPE into an rtx, and we do this by putting it in
58 consecutive "w" slots. Moreover, we've got to compute the number of "w"
59 slots at preprocessor time, which means we can't use sizeof. Guess. */
61 #define REAL_VALUE_TYPE_SIZE (SIGNIFICAND_BITS + 32)
63 (REAL_VALUE_TYPE_SIZE/HOST_BITS_PER_WIDE_INT \
64 + (REAL_VALUE_TYPE_SIZE%HOST_BITS_PER_WIDE_INT ? 1 : 0)) /* round up */
66 /* Verify the guess. */
67 extern char test_real_width
68 [sizeof(REAL_VALUE_TYPE) <= REAL_WIDTH*sizeof(HOST_WIDE_INT) ? 1 : -1];
70 /* Calculate the format for CONST_DOUBLE. We need as many slots as
71 are necessary to overlay a REAL_VALUE_TYPE on them. This could be
72 as many as four (32-bit HOST_WIDE_INT, 128-bit REAL_VALUE_TYPE).
74 A number of places assume that there are always at least two 'w'
75 slots in a CONST_DOUBLE, so we provide them even if one would suffice. */
78 # define CONST_DOUBLE_FORMAT "ww"
81 # define CONST_DOUBLE_FORMAT "ww"
84 # define CONST_DOUBLE_FORMAT "www"
87 # define CONST_DOUBLE_FORMAT "wwww"
90 # define CONST_DOUBLE_FORMAT "wwwww"
93 # define CONST_DOUBLE_FORMAT "wwwwww"
95 #error "REAL_WIDTH > 6 not supported"
104 /* Describes the properties of the specific target format in use. */
107 /* Move to and from the target bytes. */
108 void (*encode) PARAMS ((const struct real_format *, long *,
109 const REAL_VALUE_TYPE *));
110 void (*decode) PARAMS ((const struct real_format *, REAL_VALUE_TYPE *,
113 /* The radix of the exponent and digits of the significand. */
119 /* Size of the significand in digits of radix B. */
122 /* The minimum negative integer, x, such that b**(x-1) is normalized. */
125 /* The maximum integer, x, such that b**(x-1) is representable. */
128 /* The bit position of the sign bit, or -1 for a complex encoding. */
131 /* Properties of the format. */
135 bool has_signed_zero;
140 /* The target format used for each floating floating point mode.
141 Indexed by MODE - QFmode. */
142 extern const struct real_format *real_format_for_mode[TFmode - QFmode + 1];
145 /* Declare functions in real.c. */
147 /* Binary or unary arithmetic on tree_code. */
148 extern void real_arithmetic PARAMS ((REAL_VALUE_TYPE *, int,
149 const REAL_VALUE_TYPE *,
150 const REAL_VALUE_TYPE *));
152 /* Compare reals by tree_code. */
153 extern bool real_compare PARAMS ((int, const REAL_VALUE_TYPE *,
154 const REAL_VALUE_TYPE *));
156 /* Determine whether a floating-point value X is infinite. */
157 extern bool real_isinf PARAMS ((const REAL_VALUE_TYPE *));
159 /* Determine whether a floating-point value X is a NaN. */
160 extern bool real_isnan PARAMS ((const REAL_VALUE_TYPE *));
162 /* Determine whether a floating-point value X is negative. */
163 extern bool real_isneg PARAMS ((const REAL_VALUE_TYPE *));
165 /* Determine whether a floating-point value X is minus zero. */
166 extern bool real_isnegzero PARAMS ((const REAL_VALUE_TYPE *));
168 /* Compare two floating-point objects for bitwise identity. */
169 extern bool real_identical PARAMS ((const REAL_VALUE_TYPE *,
170 const REAL_VALUE_TYPE *));
172 /* Extend or truncate to a new mode. */
173 extern void real_convert PARAMS ((REAL_VALUE_TYPE *,
175 const REAL_VALUE_TYPE *));
177 /* Return true if truncating to NEW is exact. */
178 extern bool exact_real_truncate PARAMS ((enum machine_mode,
179 const REAL_VALUE_TYPE *));
181 /* Render R as a decimal floating point constant. */
182 extern void real_to_decimal PARAMS ((char *, const REAL_VALUE_TYPE *,
183 size_t, size_t, int));
185 /* Render R as a hexadecimal floating point constant. */
186 extern void real_to_hexadecimal PARAMS ((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 PARAMS ((const REAL_VALUE_TYPE *));
191 extern void real_to_integer2 PARAMS ((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 PARAMS ((REAL_VALUE_TYPE *, const char *));
197 /* Initialize R from an integer pair HIGH/LOW. */
198 extern void real_from_integer PARAMS ((REAL_VALUE_TYPE *,
200 unsigned HOST_WIDE_INT,
201 HOST_WIDE_INT, int));
203 extern long real_to_target_fmt PARAMS ((long *, const REAL_VALUE_TYPE *,
204 const struct real_format *));
205 extern long real_to_target PARAMS ((long *, const REAL_VALUE_TYPE *,
208 extern void real_from_target_fmt PARAMS ((REAL_VALUE_TYPE *, const long *,
209 const struct real_format *));
210 extern void real_from_target PARAMS ((REAL_VALUE_TYPE *, const long *,
213 extern void real_inf PARAMS ((REAL_VALUE_TYPE *));
215 extern bool real_nan PARAMS ((REAL_VALUE_TYPE *, const char *,
216 int, enum machine_mode));
218 extern void real_2expN PARAMS ((REAL_VALUE_TYPE *, int));
220 extern unsigned int real_hash PARAMS ((const REAL_VALUE_TYPE *));
223 /* Target formats defined in real.c. */
224 extern const struct real_format ieee_single_format;
225 extern const struct real_format ieee_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_128_format;
229 extern const struct real_format ibm_extended_format;
230 extern const struct real_format ieee_quad_format;
231 extern const struct real_format vax_f_format;
232 extern const struct real_format vax_d_format;
233 extern const struct real_format vax_g_format;
234 extern const struct real_format i370_single_format;
235 extern const struct real_format i370_double_format;
236 extern const struct real_format c4x_single_format;
237 extern const struct real_format c4x_extended_format;
238 extern const struct real_format real_internal_format;
241 /* ====================================================================== */
244 #define REAL_ARITHMETIC(value, code, d1, d2) \
245 real_arithmetic (&(value), code, &(d1), &(d2))
247 #define REAL_VALUES_IDENTICAL(x, y) real_identical (&(x), &(y))
248 #define REAL_VALUES_EQUAL(x, y) real_compare (EQ_EXPR, &(x), &(y))
249 #define REAL_VALUES_LESS(x, y) real_compare (LT_EXPR, &(x), &(y))
251 /* Determine whether a floating-point value X is infinite. */
252 #define REAL_VALUE_ISINF(x) real_isinf (&(x))
254 /* Determine whether a floating-point value X is a NaN. */
255 #define REAL_VALUE_ISNAN(x) real_isnan (&(x))
257 /* Determine whether a floating-point value X is negative. */
258 #define REAL_VALUE_NEGATIVE(x) real_isneg (&(x))
260 /* Determine whether a floating-point value X is minus zero. */
261 #define REAL_VALUE_MINUS_ZERO(x) real_isnegzero (&(x))
263 /* IN is a REAL_VALUE_TYPE. OUT is an array of longs. */
264 #define REAL_VALUE_TO_TARGET_LONG_DOUBLE(IN, OUT) \
265 real_to_target (OUT, &(IN), \
266 mode_for_size (LONG_DOUBLE_TYPE_SIZE, MODE_FLOAT, 0))
268 #define REAL_VALUE_TO_TARGET_DOUBLE(IN, OUT) \
269 real_to_target (OUT, &(IN), mode_for_size (64, MODE_FLOAT, 0))
271 /* IN is a REAL_VALUE_TYPE. OUT is a long. */
272 #define REAL_VALUE_TO_TARGET_SINGLE(IN, OUT) \
273 ((OUT) = real_to_target (NULL, &(IN), mode_for_size (32, MODE_FLOAT, 0)))
275 #define REAL_VALUE_FROM_INT(r, lo, hi, mode) \
276 real_from_integer (&(r), mode, lo, hi, 0)
278 #define REAL_VALUE_FROM_UNSIGNED_INT(r, lo, hi, mode) \
279 real_from_integer (&(r), mode, lo, hi, 1)
281 extern REAL_VALUE_TYPE real_value_truncate PARAMS ((enum machine_mode,
284 #define REAL_VALUE_TO_INT(plow, phigh, r) \
285 real_to_integer2 (plow, phigh, &(r))
287 extern REAL_VALUE_TYPE real_arithmetic2 PARAMS ((int, const REAL_VALUE_TYPE *,
288 const REAL_VALUE_TYPE *));
290 #define REAL_VALUE_NEGATE(X) \
291 real_arithmetic2 (NEGATE_EXPR, &(X), NULL)
293 #define REAL_VALUE_ABS(X) \
294 real_arithmetic2 (ABS_EXPR, &(X), NULL)
296 extern int significand_size PARAMS ((enum machine_mode));
298 extern REAL_VALUE_TYPE real_from_string2 PARAMS ((const char *,
301 #define REAL_VALUE_ATOF(s, m) \
302 real_from_string2 (s, m)
304 #define CONST_DOUBLE_ATOF(s, m) \
305 CONST_DOUBLE_FROM_REAL_VALUE (real_from_string2 (s, m), m)
307 #define REAL_VALUE_FIX(r) \
308 real_to_integer (&(r))
310 /* ??? Not quite right. */
311 #define REAL_VALUE_UNSIGNED_FIX(r) \
312 real_to_integer (&(r))
314 /* ??? These were added for Paranoia support. */
316 /* Return floor log2(R). */
317 extern int real_exponent PARAMS ((const REAL_VALUE_TYPE *));
319 /* R = A * 2**EXP. */
320 extern void real_ldexp PARAMS ((REAL_VALUE_TYPE *,
321 const REAL_VALUE_TYPE *, int));
323 /* **** End of software floating point emulator interface macros **** */
325 /* Constant real values 0, 1, 2, and -1. */
327 extern REAL_VALUE_TYPE dconst0;
328 extern REAL_VALUE_TYPE dconst1;
329 extern REAL_VALUE_TYPE dconst2;
330 extern REAL_VALUE_TYPE dconstm1;
332 /* Function to return a real value (not a tree node)
333 from a given integer constant. */
334 REAL_VALUE_TYPE real_value_from_int_cst PARAMS ((union tree_node *,
337 /* Given a CONST_DOUBLE in FROM, store into TO the value it represents. */
338 #define REAL_VALUE_FROM_CONST_DOUBLE(to, from) \
339 memcpy (&(to), &CONST_DOUBLE_LOW ((from)), sizeof (REAL_VALUE_TYPE))
341 /* Return a CONST_DOUBLE with value R and mode M. */
342 #define CONST_DOUBLE_FROM_REAL_VALUE(r, m) \
343 const_double_from_real_value (r, m)
344 extern rtx const_double_from_real_value PARAMS ((REAL_VALUE_TYPE,
347 /* Replace R by 1/R in the given machine mode, if the result is exact. */
348 extern bool exact_real_inverse PARAMS ((enum machine_mode, REAL_VALUE_TYPE *));
350 /* In tree.c: wrap up a REAL_VALUE_TYPE in a tree node. */
351 extern tree build_real PARAMS ((tree, REAL_VALUE_TYPE));
353 /* Calculate R as the square root of X in the given machine mode. */
354 extern bool real_sqrt PARAMS ((REAL_VALUE_TYPE *,
356 const REAL_VALUE_TYPE *));
358 #endif /* ! GCC_REAL_H */