source: trunk/third/gcc/real.h @ 8834

Revision 8834, 15.0 KB checked in by ghudson, 28 years ago (diff)
This commit was generated by cvs2svn to compensate for changes in r8833, which included commits to RCS files with non-trunk default branches.
Line 
1/* Front-end tree definitions for GNU compiler.
2   Copyright (C) 1989, 1991, 1994 Free Software Foundation, Inc.
3
4This file is part of GNU CC.
5
6GNU CC is free software; you can redistribute it and/or modify
7it under the terms of the GNU General Public License as published by
8the Free Software Foundation; either version 2, or (at your option)
9any later version.
10
11GNU CC is distributed in the hope that it will be useful,
12but WITHOUT ANY WARRANTY; without even the implied warranty of
13MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
14GNU General Public License for more details.
15
16You should have received a copy of the GNU General Public License
17along with GNU CC; see the file COPYING.  If not, write to
18the Free Software Foundation, 59 Temple Place - Suite 330,
19Boston, MA 02111-1307, USA.  */
20
21#ifndef REAL_H_INCLUDED
22#define REAL_H_INCLUDED
23
24/* Define codes for all the float formats that we know of.  */
25#define UNKNOWN_FLOAT_FORMAT 0
26#define IEEE_FLOAT_FORMAT 1
27#define VAX_FLOAT_FORMAT 2
28#define IBM_FLOAT_FORMAT 3
29
30/* Default to IEEE float if not specified.  Nearly all machines use it.  */
31
32#ifndef TARGET_FLOAT_FORMAT
33#define TARGET_FLOAT_FORMAT     IEEE_FLOAT_FORMAT
34#endif
35
36#ifndef HOST_FLOAT_FORMAT
37#define HOST_FLOAT_FORMAT       IEEE_FLOAT_FORMAT
38#endif
39
40#if TARGET_FLOAT_FORMAT == IEEE_FLOAT_FORMAT
41#define REAL_INFINITY
42#endif
43
44/* If FLOAT_WORDS_BIG_ENDIAN and HOST_FLOAT_WORDS_BIG_ENDIAN are not defined
45   in the header files, then this implies the word-endianness is the same as
46   for integers.  */
47
48/* This is defined 0 or 1, like WORDS_BIG_ENDIAN.  */
49#ifndef FLOAT_WORDS_BIG_ENDIAN
50#define FLOAT_WORDS_BIG_ENDIAN WORDS_BIG_ENDIAN
51#endif
52
53/* This is defined 0 or 1, unlike HOST_WORDS_BIG_ENDIAN.  */
54#ifndef HOST_FLOAT_WORDS_BIG_ENDIAN
55#ifdef HOST_WORDS_BIG_ENDIAN
56#define HOST_FLOAT_WORDS_BIG_ENDIAN 1
57#else
58#define HOST_FLOAT_WORDS_BIG_ENDIAN 0
59#endif
60#endif
61
62/* Defining REAL_ARITHMETIC invokes a floating point emulator
63   that can produce a target machine format differing by more
64   than just endian-ness from the host's format.  The emulator
65   is also used to support extended real XFmode.  */
66#ifndef LONG_DOUBLE_TYPE_SIZE
67#define LONG_DOUBLE_TYPE_SIZE 64
68#endif
69#if (LONG_DOUBLE_TYPE_SIZE == 96) || (LONG_DOUBLE_TYPE_SIZE == 128)
70#ifndef REAL_ARITHMETIC
71#define REAL_ARITHMETIC
72#endif
73#endif
74#ifdef REAL_ARITHMETIC
75/* **** Start of software floating point emulator interface macros **** */
76
77/* Support 80-bit extended real XFmode if LONG_DOUBLE_TYPE_SIZE
78   has been defined to be 96 in the tm.h machine file. */
79#if (LONG_DOUBLE_TYPE_SIZE == 96)
80#define REAL_IS_NOT_DOUBLE
81#define REAL_ARITHMETIC
82typedef struct {
83  HOST_WIDE_INT r[(11 + sizeof (HOST_WIDE_INT))/(sizeof (HOST_WIDE_INT))];
84} realvaluetype;
85#define REAL_VALUE_TYPE realvaluetype
86
87#else /* no XFmode support */
88
89#if (LONG_DOUBLE_TYPE_SIZE == 128)
90
91#define REAL_IS_NOT_DOUBLE
92#define REAL_ARITHMETIC
93typedef struct {
94  HOST_WIDE_INT r[(19 + sizeof (HOST_WIDE_INT))/(sizeof (HOST_WIDE_INT))];
95} realvaluetype;
96#define REAL_VALUE_TYPE realvaluetype
97
98#else /* not TFmode */
99
100#if HOST_FLOAT_FORMAT != TARGET_FLOAT_FORMAT
101/* If no XFmode support, then a REAL_VALUE_TYPE is 64 bits wide
102   but it is not necessarily a host machine double. */
103#define REAL_IS_NOT_DOUBLE
104typedef struct {
105  HOST_WIDE_INT r[(7 + sizeof (HOST_WIDE_INT))/(sizeof (HOST_WIDE_INT))];
106} realvaluetype;
107#define REAL_VALUE_TYPE realvaluetype
108#else
109/* If host and target formats are compatible, then a REAL_VALUE_TYPE
110   is actually a host machine double. */
111#define REAL_VALUE_TYPE double
112#endif
113
114#endif /* no TFmode support */
115#endif /* no XFmode support */
116
117extern int significand_size     PROTO((enum machine_mode));
118
119/* If emulation has been enabled by defining REAL_ARITHMETIC or by
120   setting LONG_DOUBLE_TYPE_SIZE to 96 or 128, then define macros so that
121   they invoke emulator functions. This will succeed only if the machine
122   files have been updated to use these macros in place of any
123   references to host machine `double' or `float' types.  */
124#ifdef REAL_ARITHMETIC
125#undef REAL_ARITHMETIC
126#define REAL_ARITHMETIC(value, code, d1, d2) \
127  earith (&(value), (code), &(d1), &(d2))
128
129/* Declare functions in real.c. */
130extern void earith              PROTO((REAL_VALUE_TYPE *, int,
131                                       REAL_VALUE_TYPE *, REAL_VALUE_TYPE *));
132extern REAL_VALUE_TYPE etrunci  PROTO((REAL_VALUE_TYPE));
133extern REAL_VALUE_TYPE etruncui PROTO((REAL_VALUE_TYPE));
134extern REAL_VALUE_TYPE ereal_atof PROTO((char *, enum machine_mode));
135extern REAL_VALUE_TYPE ereal_negate PROTO((REAL_VALUE_TYPE));
136extern HOST_WIDE_INT efixi      PROTO((REAL_VALUE_TYPE));
137extern unsigned HOST_WIDE_INT efixui PROTO((REAL_VALUE_TYPE));
138extern void ereal_from_int      PROTO((REAL_VALUE_TYPE *,
139                                       HOST_WIDE_INT, HOST_WIDE_INT));
140extern void ereal_from_uint     PROTO((REAL_VALUE_TYPE *,
141                                       unsigned HOST_WIDE_INT,
142                                       unsigned HOST_WIDE_INT));
143extern void ereal_to_int        PROTO((HOST_WIDE_INT *, HOST_WIDE_INT *,
144                                       REAL_VALUE_TYPE));
145extern REAL_VALUE_TYPE ereal_ldexp PROTO((REAL_VALUE_TYPE, int));
146
147extern void etartdouble         PROTO((REAL_VALUE_TYPE, long *));
148extern void etarldouble         PROTO((REAL_VALUE_TYPE, long *));
149extern void etardouble          PROTO((REAL_VALUE_TYPE, long *));
150extern long etarsingle          PROTO((REAL_VALUE_TYPE));
151extern void ereal_to_decimal    PROTO((REAL_VALUE_TYPE, char *));
152extern int ereal_cmp            PROTO((REAL_VALUE_TYPE, REAL_VALUE_TYPE));
153extern int ereal_isneg          PROTO((REAL_VALUE_TYPE));
154extern REAL_VALUE_TYPE ereal_from_float PROTO((HOST_WIDE_INT));
155extern REAL_VALUE_TYPE ereal_from_double PROTO((HOST_WIDE_INT *));
156
157#define REAL_VALUES_EQUAL(x, y) (ereal_cmp ((x), (y)) == 0)
158/* true if x < y : */
159#define REAL_VALUES_LESS(x, y) (ereal_cmp ((x), (y)) == -1)
160#define REAL_VALUE_LDEXP(x, n) ereal_ldexp (x, n)
161
162/* These return REAL_VALUE_TYPE: */
163#define REAL_VALUE_RNDZINT(x) (etrunci (x))
164#define REAL_VALUE_UNSIGNED_RNDZINT(x) (etruncui (x))
165extern REAL_VALUE_TYPE real_value_truncate ();
166#define REAL_VALUE_TRUNCATE(mode, x)  real_value_truncate (mode, x)
167
168/* These return HOST_WIDE_INT: */
169/* Convert a floating-point value to integer, rounding toward zero.  */
170#define REAL_VALUE_FIX(x) (efixi (x))
171/* Convert a floating-point value to unsigned integer, rounding
172   toward zero. */
173#define REAL_VALUE_UNSIGNED_FIX(x) (efixui (x))
174
175#define REAL_VALUE_ATOF ereal_atof
176#define REAL_VALUE_NEGATE ereal_negate
177
178#define REAL_VALUE_MINUS_ZERO(x) \
179 ((ereal_cmp (x, dconst0) == 0) && (ereal_isneg (x) != 0 ))
180
181#define REAL_VALUE_TO_INT ereal_to_int
182
183/* Here the cast to HOST_WIDE_INT sign-extends arguments such as ~0.  */
184#define REAL_VALUE_FROM_INT(d, lo, hi) \
185  ereal_from_int (&d, (HOST_WIDE_INT) (lo), (HOST_WIDE_INT) (hi))
186
187#define REAL_VALUE_FROM_UNSIGNED_INT(d, lo, hi) (ereal_from_uint (&d, lo, hi))
188
189/* IN is a REAL_VALUE_TYPE.  OUT is an array of longs. */
190#if LONG_DOUBLE_TYPE_SIZE == 96
191#define REAL_VALUE_TO_TARGET_LONG_DOUBLE(IN, OUT) (etarldouble ((IN), (OUT)))
192#else
193#define REAL_VALUE_TO_TARGET_LONG_DOUBLE(IN, OUT) (etartdouble ((IN), (OUT)))
194#endif
195#define REAL_VALUE_TO_TARGET_DOUBLE(IN, OUT) (etardouble ((IN), (OUT)))
196
197/* IN is a REAL_VALUE_TYPE.  OUT is a long. */
198#define REAL_VALUE_TO_TARGET_SINGLE(IN, OUT) ((OUT) = etarsingle ((IN)))
199
200/* d is an array of HOST_WIDE_INT that holds a double precision
201   value in the target computer's floating point format. */
202#define REAL_VALUE_FROM_TARGET_DOUBLE(d)  (ereal_from_double (d))
203
204/* f is a HOST_WIDE_INT containing a single precision target float value. */
205#define REAL_VALUE_FROM_TARGET_SINGLE(f)  (ereal_from_float (f))
206
207/* Conversions to decimal ASCII string.  */
208#define REAL_VALUE_TO_DECIMAL(r, fmt, s) (ereal_to_decimal (r, s))
209
210#endif /* REAL_ARITHMETIC defined */
211
212/* **** End of software floating point emulator interface macros **** */
213#else /* No XFmode or TFmode and REAL_ARITHMETIC not defined */
214
215/* old interface */
216#ifdef REAL_ARITHMETIC
217/* Defining REAL_IS_NOT_DOUBLE breaks certain initializations
218   when REAL_ARITHMETIC etc. are not defined.  */
219
220/* Now see if the host and target machines use the same format.
221   If not, define REAL_IS_NOT_DOUBLE (even if we end up representing
222   reals as doubles because we have no better way in this cross compiler.)
223   This turns off various optimizations that can happen when we know the
224   compiler's float format matches the target's float format.
225   */
226#if HOST_FLOAT_FORMAT != TARGET_FLOAT_FORMAT
227#define REAL_IS_NOT_DOUBLE
228#ifndef REAL_VALUE_TYPE
229typedef struct {
230    HOST_WIDE_INT r[sizeof (double)/sizeof (HOST_WIDE_INT)];
231  } realvaluetype;
232#define REAL_VALUE_TYPE realvaluetype
233#endif /* no REAL_VALUE_TYPE */
234#endif /* formats differ */
235#endif /* 0 */
236
237#endif /* emulator not used */
238
239/* If we are not cross-compiling, use a `double' to represent the
240   floating-point value.  Otherwise, use some other type
241   (probably a struct containing an array of longs).  */
242#ifndef REAL_VALUE_TYPE
243#define REAL_VALUE_TYPE double
244#else
245#define REAL_IS_NOT_DOUBLE
246#endif
247
248#if HOST_FLOAT_FORMAT == TARGET_FLOAT_FORMAT
249
250/* Convert a type `double' value in host format first to a type `float'
251   value in host format and then to a single type `long' value which
252   is the bitwise equivalent of the `float' value.  */
253#ifndef REAL_VALUE_TO_TARGET_SINGLE
254#define REAL_VALUE_TO_TARGET_SINGLE(IN, OUT)                            \
255do { float f = (float) (IN);                                            \
256     (OUT) = *(long *) &f;                                              \
257   } while (0)
258#endif
259
260/* Convert a type `double' value in host format to a pair of type `long'
261   values which is its bitwise equivalent, but put the two words into
262   proper word order for the target.  */
263#ifndef REAL_VALUE_TO_TARGET_DOUBLE
264#define REAL_VALUE_TO_TARGET_DOUBLE(IN, OUT)                            \
265do { REAL_VALUE_TYPE in = (IN);  /* Make sure it's not in a register.  */\
266     if (HOST_FLOAT_WORDS_BIG_ENDIAN == FLOAT_WORDS_BIG_ENDIAN)         \
267       {                                                                \
268         (OUT)[0] = ((long *) &in)[0];                                  \
269         (OUT)[1] = ((long *) &in)[1];                                  \
270       }                                                                \
271     else                                                               \
272       {                                                                \
273         (OUT)[1] = ((long *) &in)[0];                                  \
274         (OUT)[0] = ((long *) &in)[1];                                  \
275       }                                                                \
276   } while (0)
277#endif
278#endif /* HOST_FLOAT_FORMAT == TARGET_FLOAT_FORMAT */
279
280/* In this configuration, double and long double are the same. */
281#ifndef REAL_VALUE_TO_TARGET_LONG_DOUBLE
282#define REAL_VALUE_TO_TARGET_LONG_DOUBLE(a, b) REAL_VALUE_TO_TARGET_DOUBLE (a, b)
283#endif
284
285/* Compare two floating-point values for equality.  */
286#ifndef REAL_VALUES_EQUAL
287#define REAL_VALUES_EQUAL(x, y) ((x) == (y))
288#endif
289
290/* Compare two floating-point values for less than.  */
291#ifndef REAL_VALUES_LESS
292#define REAL_VALUES_LESS(x, y) ((x) < (y))
293#endif
294
295/* Truncate toward zero to an integer floating-point value.  */
296#ifndef REAL_VALUE_RNDZINT
297#define REAL_VALUE_RNDZINT(x) ((double) ((int) (x)))
298#endif
299
300/* Truncate toward zero to an unsigned integer floating-point value.  */
301#ifndef REAL_VALUE_UNSIGNED_RNDZINT
302#define REAL_VALUE_UNSIGNED_RNDZINT(x) ((double) ((unsigned int) (x)))
303#endif
304
305/* Convert a floating-point value to integer, rounding toward zero.  */
306#ifndef REAL_VALUE_FIX
307#define REAL_VALUE_FIX(x) ((int) (x))
308#endif
309
310/* Convert a floating-point value to unsigned integer, rounding
311   toward zero. */
312#ifndef REAL_VALUE_UNSIGNED_FIX
313#define REAL_VALUE_UNSIGNED_FIX(x) ((unsigned int) (x))
314#endif
315
316/* Scale X by Y powers of 2.  */
317#ifndef REAL_VALUE_LDEXP
318#define REAL_VALUE_LDEXP(x, y) ldexp (x, y)
319extern double ldexp ();
320#endif
321
322/* Convert the string X to a floating-point value.  */
323#ifndef REAL_VALUE_ATOF
324#if 1
325/* Use real.c to convert decimal numbers to binary, ... */
326REAL_VALUE_TYPE ereal_atof ();
327#define REAL_VALUE_ATOF(x, s) ereal_atof (x, s)
328#else
329/* ... or, if you like the host computer's atof, go ahead and use it: */
330#define REAL_VALUE_ATOF(x, s) atof (x)
331#if defined (MIPSEL) || defined (MIPSEB)
332/* MIPS compiler can't handle parens around the function name.
333   This problem *does not* appear to be connected with any
334   macro definition for atof.  It does not seem there is one.  */
335extern double atof ();
336#else
337extern double (atof) ();
338#endif
339#endif
340#endif
341
342/* Negate the floating-point value X.  */
343#ifndef REAL_VALUE_NEGATE
344#define REAL_VALUE_NEGATE(x) (- (x))
345#endif
346
347/* Truncate the floating-point value X to mode MODE.  This is correct only
348   for the most common case where the host and target have objects of the same
349   size and where `float' is SFmode.  */
350
351/* Don't use REAL_VALUE_TRUNCATE directly--always call real_value_truncate.  */
352extern REAL_VALUE_TYPE real_value_truncate ();
353
354#ifndef REAL_VALUE_TRUNCATE
355#define REAL_VALUE_TRUNCATE(mode, x) \
356 (GET_MODE_BITSIZE (mode) == sizeof (float) * HOST_BITS_PER_CHAR        \
357  ? (float) (x) : (x))
358#endif
359
360/* Determine whether a floating-point value X is infinite. */
361#ifndef REAL_VALUE_ISINF
362#define REAL_VALUE_ISINF(x) (target_isinf (x))
363#endif
364
365/* Determine whether a floating-point value X is a NaN. */
366#ifndef REAL_VALUE_ISNAN
367#define REAL_VALUE_ISNAN(x) (target_isnan (x))
368#endif
369
370/* Determine whether a floating-point value X is negative. */
371#ifndef REAL_VALUE_NEGATIVE
372#define REAL_VALUE_NEGATIVE(x) (target_negative (x))
373#endif
374
375/* Determine whether a floating-point value X is minus 0. */
376#ifndef REAL_VALUE_MINUS_ZERO
377#define REAL_VALUE_MINUS_ZERO(x) ((x) == 0 && REAL_VALUE_NEGATIVE (x))
378#endif
379
380/* Constant real values 0, 1, 2, and -1.  */
381
382extern REAL_VALUE_TYPE dconst0;
383extern REAL_VALUE_TYPE dconst1;
384extern REAL_VALUE_TYPE dconst2;
385extern REAL_VALUE_TYPE dconstm1;
386
387/* Union type used for extracting real values from CONST_DOUBLEs
388   or putting them in.  */
389
390union real_extract
391{
392  REAL_VALUE_TYPE d;
393  HOST_WIDE_INT i[sizeof (REAL_VALUE_TYPE) / sizeof (HOST_WIDE_INT)];
394};
395
396/* For a CONST_DOUBLE:
397   The usual two ints that hold the value.
398   For a DImode, that is all there are;
399    and CONST_DOUBLE_LOW is the low-order word and ..._HIGH the high-order.
400   For a float, the number of ints varies,
401    and CONST_DOUBLE_LOW is the one that should come first *in memory*.
402    So use &CONST_DOUBLE_LOW(r) as the address of an array of ints.  */
403#define CONST_DOUBLE_LOW(r) XWINT (r, 2)
404#define CONST_DOUBLE_HIGH(r) XWINT (r, 3)
405
406/* Link for chain of all CONST_DOUBLEs in use in current function.  */
407#define CONST_DOUBLE_CHAIN(r) XEXP (r, 1)
408/* The MEM which represents this CONST_DOUBLE's value in memory,
409   or const0_rtx if no MEM has been made for it yet,
410   or cc0_rtx if it is not on the chain.  */
411#define CONST_DOUBLE_MEM(r) XEXP (r, 0)
412
413/* Function to return a real value (not a tree node)
414   from a given integer constant.  */
415REAL_VALUE_TYPE real_value_from_int_cst ();
416
417/* Given a CONST_DOUBLE in FROM, store into TO the value it represents.  */
418
419#define REAL_VALUE_FROM_CONST_DOUBLE(to, from)          \
420do { union real_extract u;                              \
421     bcopy ((char *) &CONST_DOUBLE_LOW ((from)), (char *) &u, sizeof u); \
422     to = u.d; } while (0)
423
424/* Return a CONST_DOUBLE with value R and mode M.  */
425
426#define CONST_DOUBLE_FROM_REAL_VALUE(r, m) immed_real_const_1 (r,  m)
427extern struct rtx_def *immed_real_const_1       PROTO((REAL_VALUE_TYPE,
428                                                       enum machine_mode));
429
430
431/* Convert a floating point value `r', that can be interpreted
432   as a host machine float or double, to a decimal ASCII string `s'
433   using printf format string `fmt'.  */
434#ifndef REAL_VALUE_TO_DECIMAL
435#define REAL_VALUE_TO_DECIMAL(r, fmt, s) (sprintf (s, fmt, r))
436#endif
437
438#endif /* Not REAL_H_INCLUDED */
Note: See TracBrowser for help on using the repository browser.