1 /* Definitions of floating-point access for GNU compiler.
2 Copyright (C) 1989, 1991, 1994, 1996, 1997, 1998,
3 1999, 2000, 2002 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
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 #ifndef INTEL_EXTENDED_IEEE_FORMAT
43 #define INTEL_EXTENDED_IEEE_FORMAT 0
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 #ifndef LONG_DOUBLE_TYPE_SIZE
65 #define LONG_DOUBLE_TYPE_SIZE 64
67 /* MAX_LONG_DOUBLE_TYPE_SIZE is a constant tested by #if.
68 LONG_DOUBLE_TYPE_SIZE can vary at compiler run time.
69 So long as macros like REAL_VALUE_TO_TARGET_LONG_DOUBLE cannot
70 vary too, however, then XFmode and TFmode long double
71 cannot both be supported at the same time. */
72 #ifndef MAX_LONG_DOUBLE_TYPE_SIZE
73 #define MAX_LONG_DOUBLE_TYPE_SIZE LONG_DOUBLE_TYPE_SIZE
76 /* **** Start of software floating point emulator interface macros **** */
78 /* REAL_VALUE_TYPE is an array of the minimum number of HOST_WIDE_INTs
79 required to hold either a 96- or 160-bit extended precision floating
80 point type. This is true even if the maximum precision floating
81 point type on the target is smaller. */
82 #if MAX_LONG_DOUBLE_TYPE_SIZE == 128 && !INTEL_EXTENDED_IEEE_FORMAT
83 #define REAL_VALUE_TYPE_SIZE 160
85 #define REAL_VALUE_TYPE_SIZE 96
88 (REAL_VALUE_TYPE_SIZE/HOST_BITS_PER_WIDE_INT \
89 + (REAL_VALUE_TYPE_SIZE%HOST_BITS_PER_WIDE_INT ? 1 : 0)) /* round up */
91 HOST_WIDE_INT r
[REAL_WIDTH
];
93 /* Various headers condition prototypes on #ifdef REAL_VALUE_TYPE, so it needs
95 #define REAL_VALUE_TYPE realvaluetype
97 /* Calculate the format for CONST_DOUBLE. We need as many slots as
98 are necessary to overlay a REAL_VALUE_TYPE on them. This could be
99 as many as five (32-bit HOST_WIDE_INT, 160-bit REAL_VALUE_TYPE).
101 A number of places assume that there are always at least two 'w'
102 slots in a CONST_DOUBLE, so we provide them even if one would suffice. */
105 # define CONST_DOUBLE_FORMAT "ww"
108 # define CONST_DOUBLE_FORMAT "ww"
111 # define CONST_DOUBLE_FORMAT "www"
114 # define CONST_DOUBLE_FORMAT "wwww"
117 # define CONST_DOUBLE_FORMAT "wwwww"
119 #error "REAL_WIDTH > 5 not supported"
126 extern unsigned int significand_size
PARAMS ((enum machine_mode
));
128 #define REAL_ARITHMETIC(value, code, d1, d2) \
129 earith (&(value), (code), &(d1), &(d2))
131 /* Declare functions in real.c. */
132 extern void earith
PARAMS ((REAL_VALUE_TYPE
*, int,
133 REAL_VALUE_TYPE
*, REAL_VALUE_TYPE
*));
134 extern REAL_VALUE_TYPE etrunci
PARAMS ((REAL_VALUE_TYPE
));
135 extern REAL_VALUE_TYPE etruncui
PARAMS ((REAL_VALUE_TYPE
));
136 extern REAL_VALUE_TYPE ereal_negate
PARAMS ((REAL_VALUE_TYPE
));
137 extern HOST_WIDE_INT efixi
PARAMS ((REAL_VALUE_TYPE
));
138 extern unsigned HOST_WIDE_INT efixui
PARAMS ((REAL_VALUE_TYPE
));
139 extern void ereal_from_int
PARAMS ((REAL_VALUE_TYPE
*,
140 HOST_WIDE_INT
, HOST_WIDE_INT
,
142 extern void ereal_from_uint
PARAMS ((REAL_VALUE_TYPE
*,
143 unsigned HOST_WIDE_INT
,
144 unsigned HOST_WIDE_INT
,
146 extern void ereal_to_int
PARAMS ((HOST_WIDE_INT
*, HOST_WIDE_INT
*,
148 extern REAL_VALUE_TYPE ereal_ldexp
PARAMS ((REAL_VALUE_TYPE
, int));
150 extern void etartdouble
PARAMS ((REAL_VALUE_TYPE
, long *));
151 extern void etarldouble
PARAMS ((REAL_VALUE_TYPE
, long *));
152 extern void etardouble
PARAMS ((REAL_VALUE_TYPE
, long *));
153 extern long etarsingle
PARAMS ((REAL_VALUE_TYPE
));
154 extern void ereal_to_decimal
PARAMS ((REAL_VALUE_TYPE
, char *));
155 extern int ereal_cmp
PARAMS ((REAL_VALUE_TYPE
, REAL_VALUE_TYPE
));
156 extern int ereal_isneg
PARAMS ((REAL_VALUE_TYPE
));
157 extern REAL_VALUE_TYPE ereal_unto_float
PARAMS ((long));
158 extern REAL_VALUE_TYPE ereal_unto_double
PARAMS ((long *));
159 extern REAL_VALUE_TYPE ereal_from_float
PARAMS ((HOST_WIDE_INT
));
160 extern REAL_VALUE_TYPE ereal_from_double
PARAMS ((HOST_WIDE_INT
*));
162 #define REAL_VALUES_EQUAL(x, y) (ereal_cmp ((x), (y)) == 0)
163 /* true if x < y : */
164 #define REAL_VALUES_LESS(x, y) (ereal_cmp ((x), (y)) == -1)
165 #define REAL_VALUE_LDEXP(x, n) ereal_ldexp (x, n)
167 /* Compare two floating-point objects for bitwise identity.
168 This is not the same as comparing for equality on IEEE hosts:
169 -0.0 equals 0.0 but they are not identical, and conversely
170 two NaNs might be identical but they cannot be equal. */
171 #define REAL_VALUES_IDENTICAL(x, y) \
172 (!memcmp ((char *) &(x), (char *) &(y), sizeof (REAL_VALUE_TYPE)))
174 /* These return REAL_VALUE_TYPE: */
175 #define REAL_VALUE_RNDZINT(x) (etrunci (x))
176 #define REAL_VALUE_UNSIGNED_RNDZINT(x) (etruncui (x))
178 /* Truncate the floating-point value X to mode MODE. */
179 #define REAL_VALUE_TRUNCATE(mode, x) real_value_truncate (mode, x)
180 extern REAL_VALUE_TYPE real_value_truncate
PARAMS ((enum machine_mode
,
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 /* Compute the absolute value of a floating-point value X. */
198 #define REAL_VALUE_ABS(x) \
199 (REAL_VALUE_NEGATIVE (x) ? REAL_VALUE_NEGATE (x) : (x))
201 /* Determine whether a floating-point value X is infinite. */
202 #define REAL_VALUE_ISINF(x) (target_isinf (x))
204 /* Determine whether a floating-point value X is a NaN. */
205 #define REAL_VALUE_ISNAN(x) (target_isnan (x))
207 /* Determine whether a floating-point value X is negative. */
208 #define REAL_VALUE_NEGATIVE(x) (target_negative (x))
210 /* Determine whether a floating-point value X is minus zero. */
211 #define REAL_VALUE_MINUS_ZERO(x) \
212 ((ereal_cmp (x, dconst0) == 0) && (ereal_isneg (x) != 0 ))
214 #define REAL_VALUE_TO_INT ereal_to_int
216 /* Here the cast to HOST_WIDE_INT sign-extends arguments such as ~0. */
217 #define REAL_VALUE_FROM_INT(d, lo, hi, mode) \
218 ereal_from_int (&d, (HOST_WIDE_INT) (lo), (HOST_WIDE_INT) (hi), mode)
220 #define REAL_VALUE_FROM_UNSIGNED_INT(d, lo, hi, mode) \
221 ereal_from_uint (&d, lo, hi, mode)
223 /* IN is a REAL_VALUE_TYPE. OUT is an array of longs. */
224 #define REAL_VALUE_TO_TARGET_LONG_DOUBLE(IN, OUT) \
225 (LONG_DOUBLE_TYPE_SIZE == 64 ? etardouble ((IN), (OUT)) \
226 : LONG_DOUBLE_TYPE_SIZE == 96 ? etarldouble ((IN), (OUT)) \
227 : LONG_DOUBLE_TYPE_SIZE == 128 ? etartdouble ((IN), (OUT)) \
229 #define REAL_VALUE_TO_TARGET_DOUBLE(IN, OUT) (etardouble ((IN), (OUT)))
231 /* IN is a REAL_VALUE_TYPE. OUT is a long. */
232 #define REAL_VALUE_TO_TARGET_SINGLE(IN, OUT) ((OUT) = etarsingle ((IN)))
234 /* Inverse of REAL_VALUE_TO_TARGET_DOUBLE. */
235 #define REAL_VALUE_UNTO_TARGET_DOUBLE(d) (ereal_unto_double (d))
237 /* Inverse of REAL_VALUE_TO_TARGET_SINGLE. */
238 #define REAL_VALUE_UNTO_TARGET_SINGLE(f) (ereal_unto_float (f))
240 /* d is an array of HOST_WIDE_INT that holds a double precision
241 value in the target computer's floating point format. */
242 #define REAL_VALUE_FROM_TARGET_DOUBLE(d) (ereal_from_double (d))
244 /* f is a HOST_WIDE_INT containing a single precision target float value. */
245 #define REAL_VALUE_FROM_TARGET_SINGLE(f) (ereal_from_float (f))
247 /* Conversions to decimal ASCII string. */
248 #define REAL_VALUE_TO_DECIMAL(r, fmt, s) (ereal_to_decimal (r, s))
250 /* **** End of software floating point emulator interface macros **** */
252 /* Constant real values 0, 1, 2, and -1. */
254 extern REAL_VALUE_TYPE dconst0
;
255 extern REAL_VALUE_TYPE dconst1
;
256 extern REAL_VALUE_TYPE dconst2
;
257 extern REAL_VALUE_TYPE dconstm1
;
259 /* Given a CONST_DOUBLE in FROM, store into TO the value it represents. */
260 /* Function to return a real value (not a tree node)
261 from a given integer constant. */
263 REAL_VALUE_TYPE real_value_from_int_cst
PARAMS ((union tree_node
*,
266 #define REAL_VALUE_FROM_CONST_DOUBLE(to, from) \
267 memcpy (&(to), &CONST_DOUBLE_LOW ((from)), sizeof (REAL_VALUE_TYPE))
269 /* Return a CONST_DOUBLE with value R and mode M. */
271 #define CONST_DOUBLE_FROM_REAL_VALUE(r, m) \
272 const_double_from_real_value (r, m)
273 extern rtx const_double_from_real_value
PARAMS ((REAL_VALUE_TYPE
,
276 /* Shorthand; can be handy in machine descriptions. */
277 #define CONST_DOUBLE_ATOF(s, m) \
278 CONST_DOUBLE_FROM_REAL_VALUE (REAL_VALUE_ATOF (s, m), m)
280 /* Replace R by 1/R in the given machine mode, if the result is exact. */
281 extern int exact_real_inverse
PARAMS ((enum machine_mode
, REAL_VALUE_TYPE
*));
282 extern int target_isnan
PARAMS ((REAL_VALUE_TYPE
));
283 extern int target_isinf
PARAMS ((REAL_VALUE_TYPE
));
284 extern int target_negative
PARAMS ((REAL_VALUE_TYPE
));
285 extern void debug_real
PARAMS ((REAL_VALUE_TYPE
));
286 extern REAL_VALUE_TYPE ereal_atof
PARAMS ((const char *, enum machine_mode
));
288 #endif /* ! GCC_REAL_H */