1 /* Front-end tree definitions for GNU compiler.
2 Copyright (C) 1989, 1991 Free Software Foundation, Inc.
4 This file is part of GNU CC.
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)
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.
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. */
20 #ifndef REAL_H_INCLUDED
21 #define REAL_H_INCLUDED
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
29 /* Default to IEEE float if not specified. Nearly all machines use it. */
31 #ifndef TARGET_FLOAT_FORMAT
32 #define TARGET_FLOAT_FORMAT IEEE_FLOAT_FORMAT
35 #ifndef HOST_FLOAT_FORMAT
36 #define HOST_FLOAT_FORMAT IEEE_FLOAT_FORMAT
39 #if TARGET_FLOAT_FORMAT == IEEE_FLOAT_FORMAT
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
50 #if (LONG_DOUBLE_TYPE_SIZE == 96) || (LONG_DOUBLE_TYPE_SIZE == 128)
51 #ifndef REAL_ARITHMETIC
52 #define REAL_ARITHMETIC
55 #ifdef REAL_ARITHMETIC
56 /* **** Start of software floating point emulator interface macros **** */
58 /* Support 80-bit extended real XFmode if LONG_DOUBLE_TYPE_SIZE
59 has been defined to be 96 in the tm.h machine file. */
60 #if (LONG_DOUBLE_TYPE_SIZE == 96)
61 #define REAL_IS_NOT_DOUBLE
62 #define REAL_ARITHMETIC
64 HOST_WIDE_INT r
[(11 + sizeof (HOST_WIDE_INT
))/(sizeof (HOST_WIDE_INT
))];
66 #define REAL_VALUE_TYPE realvaluetype
68 #else /* no XFmode support */
70 #if (LONG_DOUBLE_TYPE_SIZE == 128)
72 #define REAL_IS_NOT_DOUBLE
73 #define REAL_ARITHMETIC
75 HOST_WIDE_INT r
[(19 + sizeof (HOST_WIDE_INT
))/(sizeof (HOST_WIDE_INT
))];
77 #define REAL_VALUE_TYPE realvaluetype
79 #else /* not TFmode */
81 #if HOST_FLOAT_FORMAT != TARGET_FLOAT_FORMAT
82 /* If no XFmode support, then a REAL_VALUE_TYPE is 64 bits wide
83 but it is not necessarily a host machine double. */
84 #define REAL_IS_NOT_DOUBLE
86 HOST_WIDE_INT r
[(7 + sizeof (HOST_WIDE_INT
))/(sizeof (HOST_WIDE_INT
))];
88 #define REAL_VALUE_TYPE realvaluetype
90 /* If host and target formats are compatible, then a REAL_VALUE_TYPE
91 is actually a host machine double. */
92 #define REAL_VALUE_TYPE double
95 #endif /* no TFmode support */
96 #endif /* no XFmode support */
98 /* If emulation has been enabled by defining REAL_ARITHMETIC or by
99 setting LONG_DOUBLE_TYPE_SIZE to 96 or 128, then define macros so that
100 they invoke emulator functions. This will succeed only if the machine
101 files have been updated to use these macros in place of any
102 references to host machine `double' or `float' types. */
103 #ifdef REAL_ARITHMETIC
104 #undef REAL_ARITHMETIC
105 #define REAL_ARITHMETIC(value, code, d1, d2) \
106 earith (&(value), (code), &(d1), &(d2))
108 /* Declare functions in real.c that are referenced here. */
109 void earith (), ereal_from_uint (), ereal_from_int (), ereal_to_int ();
110 void etarldouble (), etartdouble (), etardouble ();
111 long etarsingle (), efixi ();
112 unsigned long efixui ();
113 int ereal_cmp (), ereal_isneg ();
114 unsigned int eroundui ();
115 REAL_VALUE_TYPE
etrunci (), etruncui (), ereal_ldexp (), ereal_atof ();
116 REAL_VALUE_TYPE
ereal_negate (), ereal_truncate ();
117 REAL_VALUE_TYPE
ereal_from_float (), ereal_from_double ();
119 #define REAL_VALUES_EQUAL(x, y) (ereal_cmp ((x), (y)) == 0)
120 /* true if x < y : */
121 #define REAL_VALUES_LESS(x, y) (ereal_cmp ((x), (y)) == -1)
122 #define REAL_VALUE_LDEXP(x, n) ereal_ldexp (x, n)
124 /* These return REAL_VALUE_TYPE: */
125 #define REAL_VALUE_RNDZINT(x) (etrunci (x))
126 #define REAL_VALUE_UNSIGNED_RNDZINT(x) (etruncui (x))
127 extern REAL_VALUE_TYPE
real_value_truncate ();
128 #define REAL_VALUE_TRUNCATE(mode, x) real_value_truncate (mode, x)
130 /* These return int: */
131 /* Convert a floating-point value to integer, rounding toward zero. */
132 #define REAL_VALUE_FIX(x) (efixi (x))
133 /* Convert a floating-point value to unsigned integer, rounding
135 #define REAL_VALUE_UNSIGNED_FIX(x) (efixui (x))
137 #define REAL_VALUE_ATOF ereal_atof
138 #define REAL_VALUE_NEGATE ereal_negate
140 #define REAL_VALUE_MINUS_ZERO(x) \
141 ((ereal_cmp (x, dconst0) == 0) && (ereal_isneg (x) != 0 ))
143 #define REAL_VALUE_TO_INT ereal_to_int
144 #define REAL_VALUE_FROM_INT(d, i, j) (ereal_from_int (&d, i, j))
145 #define REAL_VALUE_FROM_UNSIGNED_INT(d, i, j) (ereal_from_uint (&d, i, j))
147 /* IN is a REAL_VALUE_TYPE. OUT is an array of longs. */
148 #if LONG_DOUBLE_TYPE_SIZE == 96
149 #define REAL_VALUE_TO_TARGET_LONG_DOUBLE(IN, OUT) (etarldouble ((IN), (OUT)))
151 #define REAL_VALUE_TO_TARGET_LONG_DOUBLE(IN, OUT) (etartdouble ((IN), (OUT)))
153 #define REAL_VALUE_TO_TARGET_DOUBLE(IN, OUT) (etardouble ((IN), (OUT)))
155 /* IN is a REAL_VALUE_TYPE. OUT is a long. */
156 #define REAL_VALUE_TO_TARGET_SINGLE(IN, OUT) ((OUT) = etarsingle ((IN)))
158 /* d is an array of longs. */
159 #define REAL_VALUE_FROM_TARGET_DOUBLE(d) (ereal_from_double (d))
162 #define REAL_VALUE_FROM_TARGET_SINGLE(f) (ereal_from_float (f))
164 /* Conversions to decimal ASCII string. */
165 #define REAL_VALUE_TO_DECIMAL(r, fmt, s) (ereal_to_decimal (r, s))
167 #endif /* REAL_ARITHMETIC defined */
169 /* **** End of software floating point emulator interface macros **** */
170 #else /* No XFmode or TFmode and REAL_ARITHMETIC not defined */
173 #ifdef REAL_ARITHMETIC
174 /* Defining REAL_IS_NOT_DOUBLE breaks certain initializations
175 when REAL_ARITHMETIC etc. are not defined. */
177 /* Now see if the host and target machines use the same format.
178 If not, define REAL_IS_NOT_DOUBLE (even if we end up representing
179 reals as doubles because we have no better way in this cross compiler.)
180 This turns off various optimizations that can happen when we know the
181 compiler's float format matches the target's float format.
183 #if HOST_FLOAT_FORMAT != TARGET_FLOAT_FORMAT
184 #define REAL_IS_NOT_DOUBLE
185 #ifndef REAL_VALUE_TYPE
187 HOST_WIDE_INT r
[sizeof (double)/sizeof (HOST_WIDE_INT
)];
189 #define REAL_VALUE_TYPE realvaluetype
190 #endif /* no REAL_VALUE_TYPE */
191 #endif /* formats differ */
194 #endif /* emulator not used */
196 /* If we are not cross-compiling, use a `double' to represent the
197 floating-point value. Otherwise, use some other type
198 (probably a struct containing an array of longs). */
199 #ifndef REAL_VALUE_TYPE
200 #define REAL_VALUE_TYPE double
202 #define REAL_IS_NOT_DOUBLE
205 #if HOST_FLOAT_FORMAT == TARGET_FLOAT_FORMAT
207 /* Convert a type `double' value in host format first to a type `float'
208 value in host format and then to a single type `long' value which
209 is the bitwise equivalent of the `float' value. */
210 #ifndef REAL_VALUE_TO_TARGET_SINGLE
211 #define REAL_VALUE_TO_TARGET_SINGLE(IN, OUT) \
212 do { float f = (float) (IN); \
213 (OUT) = *(long *) &f; \
217 /* Convert a type `double' value in host format to a pair of type `long'
218 values which is its bitwise equivalent, but put the two words into
219 proper word order for the target. */
220 #ifndef REAL_VALUE_TO_TARGET_DOUBLE
221 #if defined (HOST_WORDS_BIG_ENDIAN) == WORDS_BIG_ENDIAN
222 #define REAL_VALUE_TO_TARGET_DOUBLE(IN, OUT) \
223 do { REAL_VALUE_TYPE in = (IN); /* Make sure it's not in a register. */\
224 (OUT)[0] = ((long *) &in)[0]; \
225 (OUT)[1] = ((long *) &in)[1]; \
228 #define REAL_VALUE_TO_TARGET_DOUBLE(IN, OUT) \
229 do { REAL_VALUE_TYPE in = (IN); /* Make sure it's not in a register. */\
230 (OUT)[1] = ((long *) &in)[0]; \
231 (OUT)[0] = ((long *) &in)[1]; \
235 #endif /* HOST_FLOAT_FORMAT == TARGET_FLOAT_FORMAT */
237 /* In this configuration, double and long double are the same. */
238 #ifndef REAL_VALUE_TO_TARGET_LONG_DOUBLE
239 #define REAL_VALUE_TO_TARGET_LONG_DOUBLE(a, b) REAL_VALUE_TO_TARGET_DOUBLE (a, b)
242 /* Compare two floating-point values for equality. */
243 #ifndef REAL_VALUES_EQUAL
244 #define REAL_VALUES_EQUAL(x, y) ((x) == (y))
247 /* Compare two floating-point values for less than. */
248 #ifndef REAL_VALUES_LESS
249 #define REAL_VALUES_LESS(x, y) ((x) < (y))
252 /* Truncate toward zero to an integer floating-point value. */
253 #ifndef REAL_VALUE_RNDZINT
254 #define REAL_VALUE_RNDZINT(x) ((double) ((int) (x)))
257 /* Truncate toward zero to an unsigned integer floating-point value. */
258 #ifndef REAL_VALUE_UNSIGNED_RNDZINT
259 #define REAL_VALUE_UNSIGNED_RNDZINT(x) ((double) ((unsigned int) (x)))
262 /* Convert a floating-point value to integer, rounding toward zero. */
263 #ifndef REAL_VALUE_FIX
264 #define REAL_VALUE_FIX(x) ((int) (x))
267 /* Convert a floating-point value to unsigned integer, rounding
269 #ifndef REAL_VALUE_UNSIGNED_FIX
270 #define REAL_VALUE_UNSIGNED_FIX(x) ((unsigned int) (x))
273 /* Scale X by Y powers of 2. */
274 #ifndef REAL_VALUE_LDEXP
275 #define REAL_VALUE_LDEXP(x, y) ldexp (x, y)
276 extern double ldexp ();
279 /* Convert the string X to a floating-point value. */
280 #ifndef REAL_VALUE_ATOF
282 /* Use real.c to convert decimal numbers to binary, ... */
283 REAL_VALUE_TYPE
ereal_atof ();
284 #define REAL_VALUE_ATOF(x, s) ereal_atof (x, s)
286 /* ... or, if you like the host computer's atof, go ahead and use it: */
287 #define REAL_VALUE_ATOF(x, s) atof (x)
288 #if defined (MIPSEL) || defined (MIPSEB)
289 /* MIPS compiler can't handle parens around the function name.
290 This problem *does not* appear to be connected with any
291 macro definition for atof. It does not seem there is one. */
292 extern double atof ();
294 extern double (atof
) ();
299 /* Negate the floating-point value X. */
300 #ifndef REAL_VALUE_NEGATE
301 #define REAL_VALUE_NEGATE(x) (- (x))
304 /* Truncate the floating-point value X to mode MODE. This is correct only
305 for the most common case where the host and target have objects of the same
306 size and where `float' is SFmode. */
308 /* Don't use REAL_VALUE_TRUNCATE directly--always call real_value_truncate. */
309 extern REAL_VALUE_TYPE
real_value_truncate ();
311 #ifndef REAL_VALUE_TRUNCATE
312 #define REAL_VALUE_TRUNCATE(mode, x) \
313 (GET_MODE_BITSIZE (mode) == sizeof (float) * HOST_BITS_PER_CHAR \
317 /* Determine whether a floating-point value X is infinite. */
318 #ifndef REAL_VALUE_ISINF
319 #define REAL_VALUE_ISINF(x) (target_isinf (x))
322 /* Determine whether a floating-point value X is a NaN. */
323 #ifndef REAL_VALUE_ISNAN
324 #define REAL_VALUE_ISNAN(x) (target_isnan (x))
327 /* Determine whether a floating-point value X is negative. */
328 #ifndef REAL_VALUE_NEGATIVE
329 #define REAL_VALUE_NEGATIVE(x) (target_negative (x))
332 /* Determine whether a floating-point value X is minus 0. */
333 #ifndef REAL_VALUE_MINUS_ZERO
334 #define REAL_VALUE_MINUS_ZERO(x) ((x) == 0 && REAL_VALUE_NEGATIVE (x))
337 /* Constant real values 0, 1, 2, and -1. */
339 extern REAL_VALUE_TYPE dconst0
;
340 extern REAL_VALUE_TYPE dconst1
;
341 extern REAL_VALUE_TYPE dconst2
;
342 extern REAL_VALUE_TYPE dconstm1
;
344 /* Union type used for extracting real values from CONST_DOUBLEs
345 or putting them in. */
350 HOST_WIDE_INT i
[sizeof (REAL_VALUE_TYPE
) / sizeof (HOST_WIDE_INT
)];
353 /* For a CONST_DOUBLE:
354 The usual two ints that hold the value.
355 For a DImode, that is all there are;
356 and CONST_DOUBLE_LOW is the low-order word and ..._HIGH the high-order.
357 For a float, the number of ints varies,
358 and CONST_DOUBLE_LOW is the one that should come first *in memory*.
359 So use &CONST_DOUBLE_LOW(r) as the address of an array of ints. */
360 #define CONST_DOUBLE_LOW(r) XWINT (r, 2)
361 #define CONST_DOUBLE_HIGH(r) XWINT (r, 3)
363 /* Link for chain of all CONST_DOUBLEs in use in current function. */
364 #define CONST_DOUBLE_CHAIN(r) XEXP (r, 1)
365 /* The MEM which represents this CONST_DOUBLE's value in memory,
366 or const0_rtx if no MEM has been made for it yet,
367 or cc0_rtx if it is not on the chain. */
368 #define CONST_DOUBLE_MEM(r) XEXP (r, 0)
370 /* Function to return a real value (not a tree node)
371 from a given integer constant. */
372 REAL_VALUE_TYPE
real_value_from_int_cst ();
374 /* Given a CONST_DOUBLE in FROM, store into TO the value it represents. */
376 #define REAL_VALUE_FROM_CONST_DOUBLE(to, from) \
377 do { union real_extract u; \
378 bcopy (&CONST_DOUBLE_LOW ((from)), &u, sizeof u); \
379 to = u.d; } while (0)
381 /* Return a CONST_DOUBLE with value R and mode M. */
383 #define CONST_DOUBLE_FROM_REAL_VALUE(r, m) immed_real_const_1 (r, m)
385 /* Convert a floating point value `r', that can be interpreted
386 as a host machine float or double, to a decimal ASCII string `s'
387 using printf format string `fmt'. */
388 #ifndef REAL_VALUE_TO_DECIMAL
389 #define REAL_VALUE_TO_DECIMAL(r, fmt, s) (sprintf (s, fmt, r))
392 #endif /* Not REAL_H_INCLUDED */