1 /* Definitions of floating-point access for GNU compiler.
2 Copyright (C) 1989, 1991, 1994, 1996, 1997, 1998,
3 1999, 2000 Free Software Foundation, Inc.
5 This file is part of GNU CC.
7 GNU CC is free software; you can redistribute it and/or modify
8 it under the terms of the GNU General Public License as published by
9 the Free Software Foundation; either version 2, or (at your option)
12 GNU CC is distributed in the hope that it will be useful,
13 but WITHOUT ANY WARRANTY; without even the implied warranty of
14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 GNU General Public License for more details.
17 You should have received a copy of the GNU General Public License
18 along with GNU CC; see the file COPYING. If not, write to
19 the Free Software Foundation, 59 Temple Place - Suite 330,
20 Boston, MA 02111-1307, USA. */
22 #ifndef REAL_H_INCLUDED
23 #define REAL_H_INCLUDED
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
32 /* Default to IEEE float if not specified. Nearly all machines use it. */
34 #ifndef TARGET_FLOAT_FORMAT
35 #define TARGET_FLOAT_FORMAT IEEE_FLOAT_FORMAT
38 #ifndef HOST_FLOAT_FORMAT
39 #define HOST_FLOAT_FORMAT IEEE_FLOAT_FORMAT
42 #if TARGET_FLOAT_FORMAT == IEEE_FLOAT_FORMAT
46 /* If FLOAT_WORDS_BIG_ENDIAN and HOST_FLOAT_WORDS_BIG_ENDIAN are not defined
47 in the header files, then this implies the word-endianness is the same as
50 /* This is defined 0 or 1, like WORDS_BIG_ENDIAN. */
51 #ifndef FLOAT_WORDS_BIG_ENDIAN
52 #define FLOAT_WORDS_BIG_ENDIAN WORDS_BIG_ENDIAN
55 /* This is defined 0 or 1, unlike HOST_WORDS_BIG_ENDIAN. */
56 #ifndef HOST_FLOAT_WORDS_BIG_ENDIAN
57 #ifdef HOST_WORDS_BIG_ENDIAN
58 #define HOST_FLOAT_WORDS_BIG_ENDIAN 1
60 #define HOST_FLOAT_WORDS_BIG_ENDIAN 0
64 /* Defining REAL_ARITHMETIC invokes a floating point emulator
65 that can produce a target machine format differing by more
66 than just endian-ness from the host's format. The emulator
67 is also used to support extended real XFmode. */
68 #ifndef LONG_DOUBLE_TYPE_SIZE
69 #define LONG_DOUBLE_TYPE_SIZE 64
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
79 #if (MAX_LONG_DOUBLE_TYPE_SIZE == 96) || (MAX_LONG_DOUBLE_TYPE_SIZE == 128)
80 #ifndef REAL_ARITHMETIC
81 #define REAL_ARITHMETIC
84 #ifdef REAL_ARITHMETIC
85 /* **** Start of software floating point emulator interface macros **** */
87 /* Support 80-bit extended real XFmode if LONG_DOUBLE_TYPE_SIZE
88 has been defined to be 96 in the tm.h machine file. */
89 #if (MAX_LONG_DOUBLE_TYPE_SIZE == 96)
90 #define REAL_IS_NOT_DOUBLE
91 #define REAL_ARITHMETIC
93 HOST_WIDE_INT r
[(11 + sizeof (HOST_WIDE_INT
))/(sizeof (HOST_WIDE_INT
))];
95 #define REAL_VALUE_TYPE realvaluetype
97 #else /* no XFmode support */
99 #if (MAX_LONG_DOUBLE_TYPE_SIZE == 128)
101 #define REAL_IS_NOT_DOUBLE
102 #define REAL_ARITHMETIC
104 HOST_WIDE_INT r
[(19 + sizeof (HOST_WIDE_INT
))/(sizeof (HOST_WIDE_INT
))];
106 #define REAL_VALUE_TYPE realvaluetype
108 #else /* not TFmode */
110 #if HOST_FLOAT_FORMAT != TARGET_FLOAT_FORMAT
111 /* If no XFmode support, then a REAL_VALUE_TYPE is 64 bits wide
112 but it is not necessarily a host machine double. */
113 #define REAL_IS_NOT_DOUBLE
115 HOST_WIDE_INT r
[(7 + sizeof (HOST_WIDE_INT
))/(sizeof (HOST_WIDE_INT
))];
117 #define REAL_VALUE_TYPE realvaluetype
119 /* If host and target formats are compatible, then a REAL_VALUE_TYPE
120 is actually a host machine double. */
121 #define REAL_VALUE_TYPE double
124 #endif /* no TFmode support */
125 #endif /* no XFmode support */
127 extern unsigned int significand_size
PARAMS ((enum machine_mode
));
129 /* If emulation has been enabled by defining REAL_ARITHMETIC or by
130 setting LONG_DOUBLE_TYPE_SIZE to 96 or 128, then define macros so that
131 they invoke emulator functions. This will succeed only if the machine
132 files have been updated to use these macros in place of any
133 references to host machine `double' or `float' types. */
134 #ifdef REAL_ARITHMETIC
135 #undef REAL_ARITHMETIC
136 #define REAL_ARITHMETIC(value, code, d1, d2) \
137 earith (&(value), (code), &(d1), &(d2))
139 /* Declare functions in real.c. */
140 extern void earith
PARAMS ((REAL_VALUE_TYPE
*, int,
141 REAL_VALUE_TYPE
*, REAL_VALUE_TYPE
*));
142 extern REAL_VALUE_TYPE etrunci
PARAMS ((REAL_VALUE_TYPE
));
143 extern REAL_VALUE_TYPE etruncui
PARAMS ((REAL_VALUE_TYPE
));
144 extern REAL_VALUE_TYPE ereal_atof
PARAMS ((const char *, enum machine_mode
));
145 extern REAL_VALUE_TYPE ereal_negate
PARAMS ((REAL_VALUE_TYPE
));
146 extern HOST_WIDE_INT efixi
PARAMS ((REAL_VALUE_TYPE
));
147 extern unsigned HOST_WIDE_INT efixui
PARAMS ((REAL_VALUE_TYPE
));
148 extern void ereal_from_int
PARAMS ((REAL_VALUE_TYPE
*,
149 HOST_WIDE_INT
, HOST_WIDE_INT
,
151 extern void ereal_from_uint
PARAMS ((REAL_VALUE_TYPE
*,
152 unsigned HOST_WIDE_INT
,
153 unsigned HOST_WIDE_INT
,
155 extern void ereal_to_int
PARAMS ((HOST_WIDE_INT
*, HOST_WIDE_INT
*,
157 extern REAL_VALUE_TYPE ereal_ldexp
PARAMS ((REAL_VALUE_TYPE
, int));
159 extern void etartdouble
PARAMS ((REAL_VALUE_TYPE
, long *));
160 extern void etarldouble
PARAMS ((REAL_VALUE_TYPE
, long *));
161 extern void etardouble
PARAMS ((REAL_VALUE_TYPE
, long *));
162 extern long etarsingle
PARAMS ((REAL_VALUE_TYPE
));
163 extern void ereal_to_decimal
PARAMS ((REAL_VALUE_TYPE
, char *));
164 extern int ereal_cmp
PARAMS ((REAL_VALUE_TYPE
, REAL_VALUE_TYPE
));
165 extern int ereal_isneg
PARAMS ((REAL_VALUE_TYPE
));
166 extern REAL_VALUE_TYPE ereal_unto_float
PARAMS ((long));
167 extern REAL_VALUE_TYPE ereal_unto_double
PARAMS ((long *));
168 extern REAL_VALUE_TYPE ereal_from_float
PARAMS ((HOST_WIDE_INT
));
169 extern REAL_VALUE_TYPE ereal_from_double
PARAMS ((HOST_WIDE_INT
*));
171 #define REAL_VALUES_EQUAL(x, y) (ereal_cmp ((x), (y)) == 0)
172 /* true if x < y : */
173 #define REAL_VALUES_LESS(x, y) (ereal_cmp ((x), (y)) == -1)
174 #define REAL_VALUE_LDEXP(x, n) ereal_ldexp (x, n)
176 /* These return REAL_VALUE_TYPE: */
177 #define REAL_VALUE_RNDZINT(x) (etrunci (x))
178 #define REAL_VALUE_UNSIGNED_RNDZINT(x) (etruncui (x))
179 extern REAL_VALUE_TYPE real_value_truncate
PARAMS ((enum machine_mode
,
181 #define REAL_VALUE_TRUNCATE(mode, x) real_value_truncate (mode, x)
183 /* These return HOST_WIDE_INT: */
184 /* Convert a floating-point value to integer, rounding toward zero. */
185 #define REAL_VALUE_FIX(x) (efixi (x))
186 /* Convert a floating-point value to unsigned integer, rounding
188 #define REAL_VALUE_UNSIGNED_FIX(x) (efixui (x))
190 /* Convert ASCII string S to floating point in mode M.
191 Decimal input uses ATOF. Hexadecimal uses HTOF. */
192 #define REAL_VALUE_ATOF(s,m) ereal_atof(s,m)
193 #define REAL_VALUE_HTOF(s,m) ereal_atof(s,m)
195 #define REAL_VALUE_NEGATE ereal_negate
197 #define REAL_VALUE_MINUS_ZERO(x) \
198 ((ereal_cmp (x, dconst0) == 0) && (ereal_isneg (x) != 0 ))
200 #define REAL_VALUE_TO_INT ereal_to_int
202 /* Here the cast to HOST_WIDE_INT sign-extends arguments such as ~0. */
203 #define REAL_VALUE_FROM_INT(d, lo, hi, mode) \
204 ereal_from_int (&d, (HOST_WIDE_INT) (lo), (HOST_WIDE_INT) (hi), mode)
206 #define REAL_VALUE_FROM_UNSIGNED_INT(d, lo, hi, mode) \
207 ereal_from_uint (&d, lo, hi, mode)
209 /* IN is a REAL_VALUE_TYPE. OUT is an array of longs. */
210 #if defined(INTEL_EXTENDED_IEEE_FORMAT) && MAX_LONG_DOUBLE_TYPE_SIZE == 128
211 #define REAL_VALUE_TO_TARGET_LONG_DOUBLE(IN, OUT) (etarldouble ((IN), (OUT)))
213 #define REAL_VALUE_TO_TARGET_LONG_DOUBLE(IN, OUT) \
214 (LONG_DOUBLE_TYPE_SIZE == 64 ? etardouble ((IN), (OUT)) \
215 : LONG_DOUBLE_TYPE_SIZE == 96 ? etarldouble ((IN), (OUT)) \
216 : LONG_DOUBLE_TYPE_SIZE == 128 ? etartdouble ((IN), (OUT)) \
219 #define REAL_VALUE_TO_TARGET_DOUBLE(IN, OUT) (etardouble ((IN), (OUT)))
221 /* IN is a REAL_VALUE_TYPE. OUT is a long. */
222 #define REAL_VALUE_TO_TARGET_SINGLE(IN, OUT) ((OUT) = etarsingle ((IN)))
224 /* Inverse of REAL_VALUE_TO_TARGET_DOUBLE. */
225 #define REAL_VALUE_UNTO_TARGET_DOUBLE(d) (ereal_unto_double (d))
227 /* Inverse of REAL_VALUE_TO_TARGET_SINGLE. */
228 #define REAL_VALUE_UNTO_TARGET_SINGLE(f) (ereal_unto_float (f))
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))
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))
237 /* Conversions to decimal ASCII string. */
238 #define REAL_VALUE_TO_DECIMAL(r, fmt, s) (ereal_to_decimal (r, s))
240 #endif /* REAL_ARITHMETIC defined */
242 /* **** End of software floating point emulator interface macros **** */
243 #else /* No XFmode or TFmode and REAL_ARITHMETIC not defined */
246 #ifdef REAL_ARITHMETIC
247 /* Defining REAL_IS_NOT_DOUBLE breaks certain initializations
248 when REAL_ARITHMETIC etc. are not defined. */
250 /* Now see if the host and target machines use the same format.
251 If not, define REAL_IS_NOT_DOUBLE (even if we end up representing
252 reals as doubles because we have no better way in this cross compiler.)
253 This turns off various optimizations that can happen when we know the
254 compiler's float format matches the target's float format.
256 #if HOST_FLOAT_FORMAT != TARGET_FLOAT_FORMAT
257 #define REAL_IS_NOT_DOUBLE
258 #ifndef REAL_VALUE_TYPE
260 HOST_WIDE_INT r
[sizeof (double)/sizeof (HOST_WIDE_INT
)];
262 #define REAL_VALUE_TYPE realvaluetype
263 #endif /* no REAL_VALUE_TYPE */
264 #endif /* formats differ */
267 #endif /* emulator not used */
269 /* If we are not cross-compiling, use a `double' to represent the
270 floating-point value. Otherwise, use some other type
271 (probably a struct containing an array of longs). */
272 #ifndef REAL_VALUE_TYPE
273 #define REAL_VALUE_TYPE double
275 #define REAL_IS_NOT_DOUBLE
278 #if HOST_FLOAT_FORMAT == TARGET_FLOAT_FORMAT
280 /* Convert a type `double' value in host format first to a type `float'
281 value in host format and then to a single type `long' value which
282 is the bitwise equivalent of the `float' value. */
283 #ifndef REAL_VALUE_TO_TARGET_SINGLE
284 #define REAL_VALUE_TO_TARGET_SINGLE(IN, OUT) \
290 if (sizeof(HOST_WIDE_INT) < sizeof(float)) \
298 /* Convert a type `double' value in host format to a pair of type `long'
299 values which is its bitwise equivalent, but put the two words into
300 proper word order for the target. */
301 #ifndef REAL_VALUE_TO_TARGET_DOUBLE
302 #define REAL_VALUE_TO_TARGET_DOUBLE(IN, OUT) \
306 HOST_WIDE_INT l[2]; \
308 if (sizeof(HOST_WIDE_INT) * 2 < sizeof(REAL_VALUE_TYPE)) \
310 u.l[0] = u.l[1] = 0; \
312 if (HOST_FLOAT_WORDS_BIG_ENDIAN == FLOAT_WORDS_BIG_ENDIAN) \
313 (OUT)[0] = u.l[0], (OUT)[1] = u.l[1]; \
315 (OUT)[1] = u.l[0], (OUT)[0] = u.l[1]; \
318 #endif /* HOST_FLOAT_FORMAT == TARGET_FLOAT_FORMAT */
320 /* In this configuration, double and long double are the same. */
321 #ifndef REAL_VALUE_TO_TARGET_LONG_DOUBLE
322 #define REAL_VALUE_TO_TARGET_LONG_DOUBLE(a, b) REAL_VALUE_TO_TARGET_DOUBLE (a, b)
325 /* Compare two floating-point objects for bitwise identity.
326 This is not the same as comparing for equality on IEEE hosts:
327 -0.0 equals 0.0 but they are not identical, and conversely
328 two NaNs might be identical but they cannot be equal. */
329 #define REAL_VALUES_IDENTICAL(x, y) \
330 (!memcmp ((char *) &(x), (char *) &(y), sizeof (REAL_VALUE_TYPE)))
332 /* Compare two floating-point values for equality. */
333 #ifndef REAL_VALUES_EQUAL
334 #define REAL_VALUES_EQUAL(x, y) ((x) == (y))
337 /* Compare two floating-point values for less than. */
338 #ifndef REAL_VALUES_LESS
339 #define REAL_VALUES_LESS(x, y) ((x) < (y))
342 /* Truncate toward zero to an integer floating-point value. */
343 #ifndef REAL_VALUE_RNDZINT
344 #define REAL_VALUE_RNDZINT(x) ((double) ((int) (x)))
347 /* Truncate toward zero to an unsigned integer floating-point value. */
348 #ifndef REAL_VALUE_UNSIGNED_RNDZINT
349 #define REAL_VALUE_UNSIGNED_RNDZINT(x) ((double) ((unsigned int) (x)))
352 /* Convert a floating-point value to integer, rounding toward zero. */
353 #ifndef REAL_VALUE_FIX
354 #define REAL_VALUE_FIX(x) ((int) (x))
357 /* Convert a floating-point value to unsigned integer, rounding
359 #ifndef REAL_VALUE_UNSIGNED_FIX
360 #define REAL_VALUE_UNSIGNED_FIX(x) ((unsigned int) (x))
363 /* Scale X by Y powers of 2. */
364 #ifndef REAL_VALUE_LDEXP
365 #define REAL_VALUE_LDEXP(x, y) ldexp (x, y)
366 extern double ldexp
PARAMS ((double, int));
369 /* Convert the string X to a floating-point value. */
370 #ifndef REAL_VALUE_ATOF
372 /* Use real.c to convert decimal numbers to binary, ... */
373 extern REAL_VALUE_TYPE ereal_atof
PARAMS ((const char *, enum machine_mode
));
374 #define REAL_VALUE_ATOF(x, s) ereal_atof (x, s)
375 /* Could use ereal_atof here for hexadecimal floats too, but real_hex_to_f
376 is OK and it uses faster native fp arithmetic. */
377 /* #define REAL_VALUE_HTOF(x, s) ereal_atof (x, s) */
379 /* ... or, if you like the host computer's atof, go ahead and use it: */
380 #define REAL_VALUE_ATOF(x, s) atof (x)
381 #if defined (MIPSEL) || defined (MIPSEB)
382 /* MIPS compiler can't handle parens around the function name.
383 This problem *does not* appear to be connected with any
384 macro definition for atof. It does not seem there is one. */
385 extern double atof ();
387 extern double (atof
) ();
392 /* Hexadecimal floating constant input for use with host computer's
394 #ifndef REAL_VALUE_HTOF
395 extern REAL_VALUE_TYPE real_hex_to_f
PARAMS ((char *, enum machine_mode
));
396 #define REAL_VALUE_HTOF(s,m) real_hex_to_f(s,m)
399 /* Negate the floating-point value X. */
400 #ifndef REAL_VALUE_NEGATE
401 #define REAL_VALUE_NEGATE(x) (- (x))
404 /* Truncate the floating-point value X to mode MODE. This is correct only
405 for the most common case where the host and target have objects of the same
406 size and where `float' is SFmode. */
408 /* Don't use REAL_VALUE_TRUNCATE directly--always call real_value_truncate. */
409 extern REAL_VALUE_TYPE real_value_truncate
PARAMS ((enum machine_mode
,
412 #ifndef REAL_VALUE_TRUNCATE
413 #define REAL_VALUE_TRUNCATE(mode, x) \
414 (GET_MODE_BITSIZE (mode) == sizeof (float) * HOST_BITS_PER_CHAR \
418 /* Determine whether a floating-point value X is infinite. */
419 #ifndef REAL_VALUE_ISINF
420 #define REAL_VALUE_ISINF(x) (target_isinf (x))
423 /* Determine whether a floating-point value X is a NaN. */
424 #ifndef REAL_VALUE_ISNAN
425 #define REAL_VALUE_ISNAN(x) (target_isnan (x))
428 /* Determine whether a floating-point value X is negative. */
429 #ifndef REAL_VALUE_NEGATIVE
430 #define REAL_VALUE_NEGATIVE(x) (target_negative (x))
433 extern int target_isnan
PARAMS ((REAL_VALUE_TYPE
));
434 extern int target_isinf
PARAMS ((REAL_VALUE_TYPE
));
435 extern int target_negative
PARAMS ((REAL_VALUE_TYPE
));
437 /* Determine whether a floating-point value X is minus 0. */
438 #ifndef REAL_VALUE_MINUS_ZERO
439 #define REAL_VALUE_MINUS_ZERO(x) ((x) == 0 && REAL_VALUE_NEGATIVE (x))
442 /* Constant real values 0, 1, 2, and -1. */
444 extern REAL_VALUE_TYPE dconst0
;
445 extern REAL_VALUE_TYPE dconst1
;
446 extern REAL_VALUE_TYPE dconst2
;
447 extern REAL_VALUE_TYPE dconstm1
;
449 /* Union type used for extracting real values from CONST_DOUBLEs
450 or putting them in. */
455 HOST_WIDE_INT i
[sizeof (REAL_VALUE_TYPE
) / sizeof (HOST_WIDE_INT
)];
458 /* Given a CONST_DOUBLE in FROM, store into TO the value it represents. */
459 /* Function to return a real value (not a tree node)
460 from a given integer constant. */
462 REAL_VALUE_TYPE real_value_from_int_cst
PARAMS ((union tree_node
*,
465 #define REAL_VALUE_FROM_CONST_DOUBLE(to, from) \
466 do { union real_extract u; \
467 bcopy ((char *) &CONST_DOUBLE_LOW ((from)), (char *) &u, sizeof u); \
468 to = u.d; } while (0)
470 /* Return a CONST_DOUBLE with value R and mode M. */
472 #define CONST_DOUBLE_FROM_REAL_VALUE(r, m) immed_real_const_1 (r, m)
473 extern struct rtx_def
*immed_real_const_1
PARAMS ((REAL_VALUE_TYPE
,
477 /* Convert a floating point value `r', that can be interpreted
478 as a host machine float or double, to a decimal ASCII string `s'
479 using printf format string `fmt'. */
480 #ifndef REAL_VALUE_TO_DECIMAL
481 #define REAL_VALUE_TO_DECIMAL(r, fmt, s) (sprintf (s, fmt, r))
484 /* Replace R by 1/R in the given machine mode, if the result is exact. */
485 extern int exact_real_inverse
PARAMS ((enum machine_mode
, REAL_VALUE_TYPE
*));
486 extern int target_isnan
PARAMS ((REAL_VALUE_TYPE
));
487 extern int target_isinf
PARAMS ((REAL_VALUE_TYPE
));
488 extern int target_negative
PARAMS ((REAL_VALUE_TYPE
));
489 extern void debug_real
PARAMS ((REAL_VALUE_TYPE
));
492 extern void assemble_real
PARAMS ((REAL_VALUE_TYPE
,
494 extern void debug_real
PARAMS ((REAL_VALUE_TYPE
));
497 extern void assemble_real
PARAMS ((REAL_VALUE_TYPE
,
499 #endif /* Not REAL_H_INCLUDED */