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 #ifndef MAX_LONG_DOUBLE_TYPE_SIZE
72 #define MAX_LONG_DOUBLE_TYPE_SIZE LONG_DOUBLE_TYPE_SIZE
74 #if (MAX_LONG_DOUBLE_TYPE_SIZE == 96) || (MAX_LONG_DOUBLE_TYPE_SIZE == 128)
75 #ifndef REAL_ARITHMETIC
76 #define REAL_ARITHMETIC
79 #ifdef REAL_ARITHMETIC
80 /* **** Start of software floating point emulator interface macros **** */
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 #define REAL_ARITHMETIC
88 HOST_WIDE_INT r
[(11 + sizeof (HOST_WIDE_INT
))/(sizeof (HOST_WIDE_INT
))];
90 #define REAL_VALUE_TYPE realvaluetype
92 #else /* no XFmode support */
94 #if (MAX_LONG_DOUBLE_TYPE_SIZE == 128)
96 #define REAL_IS_NOT_DOUBLE
97 #define REAL_ARITHMETIC
99 HOST_WIDE_INT r
[(19 + sizeof (HOST_WIDE_INT
))/(sizeof (HOST_WIDE_INT
))];
101 #define REAL_VALUE_TYPE realvaluetype
103 #else /* not TFmode */
105 #if HOST_FLOAT_FORMAT != TARGET_FLOAT_FORMAT
106 /* If no XFmode support, then a REAL_VALUE_TYPE is 64 bits wide
107 but it is not necessarily a host machine double. */
108 #define REAL_IS_NOT_DOUBLE
110 HOST_WIDE_INT r
[(7 + sizeof (HOST_WIDE_INT
))/(sizeof (HOST_WIDE_INT
))];
112 #define REAL_VALUE_TYPE realvaluetype
114 /* If host and target formats are compatible, then a REAL_VALUE_TYPE
115 is actually a host machine double. */
116 #define REAL_VALUE_TYPE double
119 #endif /* no TFmode support */
120 #endif /* no XFmode support */
122 extern int significand_size
PARAMS ((enum machine_mode
));
124 /* If emulation has been enabled by defining REAL_ARITHMETIC or by
125 setting LONG_DOUBLE_TYPE_SIZE to 96 or 128, then define macros so that
126 they invoke emulator functions. This will succeed only if the machine
127 files have been updated to use these macros in place of any
128 references to host machine `double' or `float' types. */
129 #ifdef REAL_ARITHMETIC
130 #undef REAL_ARITHMETIC
131 #define REAL_ARITHMETIC(value, code, d1, d2) \
132 earith (&(value), (code), &(d1), &(d2))
134 /* Declare functions in real.c. */
135 extern void earith
PARAMS ((REAL_VALUE_TYPE
*, int,
136 REAL_VALUE_TYPE
*, REAL_VALUE_TYPE
*));
137 extern REAL_VALUE_TYPE etrunci
PARAMS ((REAL_VALUE_TYPE
));
138 extern REAL_VALUE_TYPE etruncui
PARAMS ((REAL_VALUE_TYPE
));
139 extern REAL_VALUE_TYPE ereal_atof
PARAMS ((const char *, enum machine_mode
));
140 extern REAL_VALUE_TYPE ereal_negate
PARAMS ((REAL_VALUE_TYPE
));
141 extern HOST_WIDE_INT efixi
PARAMS ((REAL_VALUE_TYPE
));
142 extern unsigned HOST_WIDE_INT efixui
PARAMS ((REAL_VALUE_TYPE
));
143 extern void ereal_from_int
PARAMS ((REAL_VALUE_TYPE
*,
144 HOST_WIDE_INT
, HOST_WIDE_INT
,
146 extern void ereal_from_uint
PARAMS ((REAL_VALUE_TYPE
*,
147 unsigned HOST_WIDE_INT
,
148 unsigned HOST_WIDE_INT
,
150 extern void ereal_to_int
PARAMS ((HOST_WIDE_INT
*, HOST_WIDE_INT
*,
152 extern REAL_VALUE_TYPE ereal_ldexp
PARAMS ((REAL_VALUE_TYPE
, int));
154 extern void etartdouble
PARAMS ((REAL_VALUE_TYPE
, long *));
155 extern void etarldouble
PARAMS ((REAL_VALUE_TYPE
, long *));
156 extern void etardouble
PARAMS ((REAL_VALUE_TYPE
, long *));
157 extern long etarsingle
PARAMS ((REAL_VALUE_TYPE
));
158 extern void ereal_to_decimal
PARAMS ((REAL_VALUE_TYPE
, char *));
159 extern int ereal_cmp
PARAMS ((REAL_VALUE_TYPE
, REAL_VALUE_TYPE
));
160 extern int ereal_isneg
PARAMS ((REAL_VALUE_TYPE
));
161 extern REAL_VALUE_TYPE ereal_unto_float
PARAMS ((long));
162 extern REAL_VALUE_TYPE ereal_unto_double
PARAMS ((long *));
163 extern REAL_VALUE_TYPE ereal_from_float
PARAMS ((HOST_WIDE_INT
));
164 extern REAL_VALUE_TYPE ereal_from_double
PARAMS ((HOST_WIDE_INT
*));
166 #define REAL_VALUES_EQUAL(x, y) (ereal_cmp ((x), (y)) == 0)
167 /* true if x < y : */
168 #define REAL_VALUES_LESS(x, y) (ereal_cmp ((x), (y)) == -1)
169 #define REAL_VALUE_LDEXP(x, n) ereal_ldexp (x, n)
171 /* These return REAL_VALUE_TYPE: */
172 #define REAL_VALUE_RNDZINT(x) (etrunci (x))
173 #define REAL_VALUE_UNSIGNED_RNDZINT(x) (etruncui (x))
174 extern REAL_VALUE_TYPE real_value_truncate
PARAMS ((enum machine_mode
,
176 #define REAL_VALUE_TRUNCATE(mode, x) real_value_truncate (mode, x)
178 /* These return HOST_WIDE_INT: */
179 /* Convert a floating-point value to integer, rounding toward zero. */
180 #define REAL_VALUE_FIX(x) (efixi (x))
181 /* Convert a floating-point value to unsigned integer, rounding
183 #define REAL_VALUE_UNSIGNED_FIX(x) (efixui (x))
185 /* Convert ASCII string S to floating point in mode M.
186 Decimal input uses ATOF. Hexadecimal uses HTOF. */
187 #define REAL_VALUE_ATOF(s,m) ereal_atof(s,m)
188 #define REAL_VALUE_HTOF(s,m) ereal_atof(s,m)
190 #define REAL_VALUE_NEGATE ereal_negate
192 #define REAL_VALUE_MINUS_ZERO(x) \
193 ((ereal_cmp (x, dconst0) == 0) && (ereal_isneg (x) != 0 ))
195 #define REAL_VALUE_TO_INT ereal_to_int
197 /* Here the cast to HOST_WIDE_INT sign-extends arguments such as ~0. */
198 #define REAL_VALUE_FROM_INT(d, lo, hi, mode) \
199 ereal_from_int (&d, (HOST_WIDE_INT) (lo), (HOST_WIDE_INT) (hi), mode)
201 #define REAL_VALUE_FROM_UNSIGNED_INT(d, lo, hi, mode) \
202 ereal_from_uint (&d, lo, hi, mode)
204 /* IN is a REAL_VALUE_TYPE. OUT is an array of longs. */
205 #if MAX_LONG_DOUBLE_TYPE_SIZE == 96
206 #define REAL_VALUE_TO_TARGET_LONG_DOUBLE(IN, OUT) (etarldouble ((IN), (OUT)))
208 #define REAL_VALUE_TO_TARGET_LONG_DOUBLE(IN, OUT) (etartdouble ((IN), (OUT)))
210 #define REAL_VALUE_TO_TARGET_DOUBLE(IN, OUT) (etardouble ((IN), (OUT)))
212 /* IN is a REAL_VALUE_TYPE. OUT is a long. */
213 #define REAL_VALUE_TO_TARGET_SINGLE(IN, OUT) ((OUT) = etarsingle ((IN)))
215 /* Inverse of REAL_VALUE_TO_TARGET_DOUBLE. */
216 #define REAL_VALUE_UNTO_TARGET_DOUBLE(d) (ereal_unto_double (d))
218 /* Inverse of REAL_VALUE_TO_TARGET_SINGLE. */
219 #define REAL_VALUE_UNTO_TARGET_SINGLE(f) (ereal_unto_float (f))
221 /* d is an array of HOST_WIDE_INT that holds a double precision
222 value in the target computer's floating point format. */
223 #define REAL_VALUE_FROM_TARGET_DOUBLE(d) (ereal_from_double (d))
225 /* f is a HOST_WIDE_INT containing a single precision target float value. */
226 #define REAL_VALUE_FROM_TARGET_SINGLE(f) (ereal_from_float (f))
228 /* Conversions to decimal ASCII string. */
229 #define REAL_VALUE_TO_DECIMAL(r, fmt, s) (ereal_to_decimal (r, s))
231 #endif /* REAL_ARITHMETIC defined */
233 /* **** End of software floating point emulator interface macros **** */
234 #else /* No XFmode or TFmode and REAL_ARITHMETIC not defined */
237 #ifdef REAL_ARITHMETIC
238 /* Defining REAL_IS_NOT_DOUBLE breaks certain initializations
239 when REAL_ARITHMETIC etc. are not defined. */
241 /* Now see if the host and target machines use the same format.
242 If not, define REAL_IS_NOT_DOUBLE (even if we end up representing
243 reals as doubles because we have no better way in this cross compiler.)
244 This turns off various optimizations that can happen when we know the
245 compiler's float format matches the target's float format.
247 #if HOST_FLOAT_FORMAT != TARGET_FLOAT_FORMAT
248 #define REAL_IS_NOT_DOUBLE
249 #ifndef REAL_VALUE_TYPE
251 HOST_WIDE_INT r
[sizeof (double)/sizeof (HOST_WIDE_INT
)];
253 #define REAL_VALUE_TYPE realvaluetype
254 #endif /* no REAL_VALUE_TYPE */
255 #endif /* formats differ */
258 #endif /* emulator not used */
260 /* If we are not cross-compiling, use a `double' to represent the
261 floating-point value. Otherwise, use some other type
262 (probably a struct containing an array of longs). */
263 #ifndef REAL_VALUE_TYPE
264 #define REAL_VALUE_TYPE double
266 #define REAL_IS_NOT_DOUBLE
269 #if HOST_FLOAT_FORMAT == TARGET_FLOAT_FORMAT
271 /* Convert a type `double' value in host format first to a type `float'
272 value in host format and then to a single type `long' value which
273 is the bitwise equivalent of the `float' value. */
274 #ifndef REAL_VALUE_TO_TARGET_SINGLE
275 #define REAL_VALUE_TO_TARGET_SINGLE(IN, OUT) \
281 if (sizeof(HOST_WIDE_INT) < sizeof(float)) \
289 /* Convert a type `double' value in host format to a pair of type `long'
290 values which is its bitwise equivalent, but put the two words into
291 proper word order for the target. */
292 #ifndef REAL_VALUE_TO_TARGET_DOUBLE
293 #define REAL_VALUE_TO_TARGET_DOUBLE(IN, OUT) \
297 HOST_WIDE_INT l[2]; \
299 if (sizeof(HOST_WIDE_INT) * 2 < sizeof(REAL_VALUE_TYPE)) \
301 u.l[0] = u.l[1] = 0; \
303 if (HOST_FLOAT_WORDS_BIG_ENDIAN == FLOAT_WORDS_BIG_ENDIAN) \
304 (OUT)[0] = u.l[0], (OUT)[1] = u.l[1]; \
306 (OUT)[1] = u.l[0], (OUT)[0] = u.l[1]; \
309 #endif /* HOST_FLOAT_FORMAT == TARGET_FLOAT_FORMAT */
311 /* In this configuration, double and long double are the same. */
312 #ifndef REAL_VALUE_TO_TARGET_LONG_DOUBLE
313 #define REAL_VALUE_TO_TARGET_LONG_DOUBLE(a, b) REAL_VALUE_TO_TARGET_DOUBLE (a, b)
316 /* Compare two floating-point objects for bitwise identity.
317 This is not the same as comparing for equality on IEEE hosts:
318 -0.0 equals 0.0 but they are not identical, and conversely
319 two NaNs might be identical but they cannot be equal. */
320 #define REAL_VALUES_IDENTICAL(x, y) \
321 (!bcmp ((char *) &(x), (char *) &(y), sizeof (REAL_VALUE_TYPE)))
323 /* Compare two floating-point values for equality. */
324 #ifndef REAL_VALUES_EQUAL
325 #define REAL_VALUES_EQUAL(x, y) ((x) == (y))
328 /* Compare two floating-point values for less than. */
329 #ifndef REAL_VALUES_LESS
330 #define REAL_VALUES_LESS(x, y) ((x) < (y))
333 /* Truncate toward zero to an integer floating-point value. */
334 #ifndef REAL_VALUE_RNDZINT
335 #define REAL_VALUE_RNDZINT(x) ((double) ((int) (x)))
338 /* Truncate toward zero to an unsigned integer floating-point value. */
339 #ifndef REAL_VALUE_UNSIGNED_RNDZINT
340 #define REAL_VALUE_UNSIGNED_RNDZINT(x) ((double) ((unsigned int) (x)))
343 /* Convert a floating-point value to integer, rounding toward zero. */
344 #ifndef REAL_VALUE_FIX
345 #define REAL_VALUE_FIX(x) ((int) (x))
348 /* Convert a floating-point value to unsigned integer, rounding
350 #ifndef REAL_VALUE_UNSIGNED_FIX
351 #define REAL_VALUE_UNSIGNED_FIX(x) ((unsigned int) (x))
354 /* Scale X by Y powers of 2. */
355 #ifndef REAL_VALUE_LDEXP
356 #define REAL_VALUE_LDEXP(x, y) ldexp (x, y)
357 extern double ldexp ();
360 /* Convert the string X to a floating-point value. */
361 #ifndef REAL_VALUE_ATOF
363 /* Use real.c to convert decimal numbers to binary, ... */
364 extern REAL_VALUE_TYPE ereal_atof
PARAMS ((const char *, enum machine_mode
));
365 #define REAL_VALUE_ATOF(x, s) ereal_atof (x, s)
366 /* Could use ereal_atof here for hexadecimal floats too, but real_hex_to_f
367 is OK and it uses faster native fp arithmetic. */
368 /* #define REAL_VALUE_HTOF(x, s) ereal_atof (x, s) */
370 /* ... or, if you like the host computer's atof, go ahead and use it: */
371 #define REAL_VALUE_ATOF(x, s) atof (x)
372 #if defined (MIPSEL) || defined (MIPSEB)
373 /* MIPS compiler can't handle parens around the function name.
374 This problem *does not* appear to be connected with any
375 macro definition for atof. It does not seem there is one. */
376 extern double atof ();
378 extern double (atof
) ();
383 /* Hexadecimal floating constant input for use with host computer's
385 #ifndef REAL_VALUE_HTOF
386 extern REAL_VALUE_TYPE real_hex_to_f
PARAMS ((char *, enum machine_mode
));
387 #define REAL_VALUE_HTOF(s,m) real_hex_to_f(s,m)
390 /* Negate the floating-point value X. */
391 #ifndef REAL_VALUE_NEGATE
392 #define REAL_VALUE_NEGATE(x) (- (x))
395 /* Truncate the floating-point value X to mode MODE. This is correct only
396 for the most common case where the host and target have objects of the same
397 size and where `float' is SFmode. */
399 /* Don't use REAL_VALUE_TRUNCATE directly--always call real_value_truncate. */
400 extern REAL_VALUE_TYPE real_value_truncate
PARAMS ((enum machine_mode
,
403 #ifndef REAL_VALUE_TRUNCATE
404 #define REAL_VALUE_TRUNCATE(mode, x) \
405 (GET_MODE_BITSIZE (mode) == sizeof (float) * HOST_BITS_PER_CHAR \
409 /* Determine whether a floating-point value X is infinite. */
410 #ifndef REAL_VALUE_ISINF
411 #define REAL_VALUE_ISINF(x) (target_isinf (x))
414 /* Determine whether a floating-point value X is a NaN. */
415 #ifndef REAL_VALUE_ISNAN
416 #define REAL_VALUE_ISNAN(x) (target_isnan (x))
419 /* Determine whether a floating-point value X is negative. */
420 #ifndef REAL_VALUE_NEGATIVE
421 #define REAL_VALUE_NEGATIVE(x) (target_negative (x))
424 extern int target_isnan
PARAMS ((REAL_VALUE_TYPE
));
425 extern int target_isinf
PARAMS ((REAL_VALUE_TYPE
));
426 extern int target_negative
PARAMS ((REAL_VALUE_TYPE
));
428 /* Determine whether a floating-point value X is minus 0. */
429 #ifndef REAL_VALUE_MINUS_ZERO
430 #define REAL_VALUE_MINUS_ZERO(x) ((x) == 0 && REAL_VALUE_NEGATIVE (x))
433 /* Constant real values 0, 1, 2, and -1. */
435 extern REAL_VALUE_TYPE dconst0
;
436 extern REAL_VALUE_TYPE dconst1
;
437 extern REAL_VALUE_TYPE dconst2
;
438 extern REAL_VALUE_TYPE dconstm1
;
440 /* Union type used for extracting real values from CONST_DOUBLEs
441 or putting them in. */
446 HOST_WIDE_INT i
[sizeof (REAL_VALUE_TYPE
) / sizeof (HOST_WIDE_INT
)];
449 /* For a CONST_DOUBLE:
450 The usual two ints that hold the value.
451 For a DImode, that is all there are;
452 and CONST_DOUBLE_LOW is the low-order word and ..._HIGH the high-order.
453 For a float, the number of ints varies,
454 and CONST_DOUBLE_LOW is the one that should come first *in memory*.
455 So use &CONST_DOUBLE_LOW(r) as the address of an array of ints. */
456 #define CONST_DOUBLE_LOW(r) XWINT (r, 2)
457 #define CONST_DOUBLE_HIGH(r) XWINT (r, 3)
459 /* Link for chain of all CONST_DOUBLEs in use in current function. */
460 #define CONST_DOUBLE_CHAIN(r) X0EXP (r, 1)
461 /* The MEM which represents this CONST_DOUBLE's value in memory,
462 or const0_rtx if no MEM has been made for it yet,
463 or cc0_rtx if it is not on the chain. */
464 #define CONST_DOUBLE_MEM(r) XEXP (r, 0)
466 /* Given a CONST_DOUBLE in FROM, store into TO the value it represents. */
467 /* Function to return a real value (not a tree node)
468 from a given integer constant. */
470 REAL_VALUE_TYPE real_value_from_int_cst
PARAMS ((union tree_node
*,
473 #define REAL_VALUE_FROM_CONST_DOUBLE(to, from) \
474 do { union real_extract u; \
475 bcopy ((char *) &CONST_DOUBLE_LOW ((from)), (char *) &u, sizeof u); \
476 to = u.d; } while (0)
478 /* Return a CONST_DOUBLE with value R and mode M. */
480 #define CONST_DOUBLE_FROM_REAL_VALUE(r, m) immed_real_const_1 (r, m)
481 extern struct rtx_def
*immed_real_const_1
PARAMS ((REAL_VALUE_TYPE
,
485 /* Convert a floating point value `r', that can be interpreted
486 as a host machine float or double, to a decimal ASCII string `s'
487 using printf format string `fmt'. */
488 #ifndef REAL_VALUE_TO_DECIMAL
489 #define REAL_VALUE_TO_DECIMAL(r, fmt, s) (sprintf (s, fmt, r))
492 /* Replace R by 1/R in the given machine mode, if the result is exact. */
493 extern int exact_real_inverse
PARAMS ((enum machine_mode
, REAL_VALUE_TYPE
*));
494 extern int target_isnan
PARAMS ((REAL_VALUE_TYPE
));
495 extern int target_isinf
PARAMS ((REAL_VALUE_TYPE
));
496 extern int target_negative
PARAMS ((REAL_VALUE_TYPE
));
497 extern void debug_real
PARAMS ((REAL_VALUE_TYPE
));
500 extern void assemble_real
PARAMS ((REAL_VALUE_TYPE
,
502 extern void debug_real
PARAMS ((REAL_VALUE_TYPE
));
505 extern void assemble_real
PARAMS ((REAL_VALUE_TYPE
,
507 #endif /* Not REAL_H_INCLUDED */