1/* Copyright (C) 2002-2014 Free Software Foundation, Inc.
2
3This file is part of GCC.
4
5GCC is free software; you can redistribute it and/or modify
6it under the terms of the GNU General Public License as published by
7the Free Software Foundation; either version 3, or (at your option)
8any later version.
9
10GCC is distributed in the hope that it will be useful,
11but WITHOUT ANY WARRANTY; without even the implied warranty of
12MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
13GNU General Public License for more details.
14
15Under Section 7 of GPL version 3, you are granted additional
16permissions described in the GCC Runtime Library Exception, version
173.1, as published by the Free Software Foundation.
18
19You should have received a copy of the GNU General Public License and
20a copy of the GCC Runtime Library Exception along with this program;
21see the files COPYING3 and COPYING.RUNTIME respectively.  If not, see
22<http://www.gnu.org/licenses/>.  */
23
24/*
25 * ISO C Standard:  5.2.4.2.2  Characteristics of floating types <float.h>
26 */
27
28#ifndef _FLOAT_H___
29#define _FLOAT_H___
30
31/* Radix of exponent representation, b. */
32#undef FLT_RADIX
33#define FLT_RADIX	__FLT_RADIX__
34
35/* Number of base-FLT_RADIX digits in the significand, p.  */
36#undef FLT_MANT_DIG
37#undef DBL_MANT_DIG
38#undef LDBL_MANT_DIG
39#define FLT_MANT_DIG	__FLT_MANT_DIG__
40#define DBL_MANT_DIG	__DBL_MANT_DIG__
41#define LDBL_MANT_DIG	__LDBL_MANT_DIG__
42
43/* Number of decimal digits, q, such that any floating-point number with q
44   decimal digits can be rounded into a floating-point number with p radix b
45   digits and back again without change to the q decimal digits,
46
47	p * log10(b)			if b is a power of 10
48	floor((p - 1) * log10(b))	otherwise
49*/
50#undef FLT_DIG
51#undef DBL_DIG
52#undef LDBL_DIG
53#define FLT_DIG		__FLT_DIG__
54#define DBL_DIG		__DBL_DIG__
55#define LDBL_DIG	__LDBL_DIG__
56
57/* Minimum int x such that FLT_RADIX**(x-1) is a normalized float, emin */
58#undef FLT_MIN_EXP
59#undef DBL_MIN_EXP
60#undef LDBL_MIN_EXP
61#define FLT_MIN_EXP	__FLT_MIN_EXP__
62#define DBL_MIN_EXP	__DBL_MIN_EXP__
63#define LDBL_MIN_EXP	__LDBL_MIN_EXP__
64
65/* Minimum negative integer such that 10 raised to that power is in the
66   range of normalized floating-point numbers,
67
68	ceil(log10(b) * (emin - 1))
69*/
70#undef FLT_MIN_10_EXP
71#undef DBL_MIN_10_EXP
72#undef LDBL_MIN_10_EXP
73#define FLT_MIN_10_EXP	__FLT_MIN_10_EXP__
74#define DBL_MIN_10_EXP	__DBL_MIN_10_EXP__
75#define LDBL_MIN_10_EXP	__LDBL_MIN_10_EXP__
76
77/* Maximum int x such that FLT_RADIX**(x-1) is a representable float, emax.  */
78#undef FLT_MAX_EXP
79#undef DBL_MAX_EXP
80#undef LDBL_MAX_EXP
81#define FLT_MAX_EXP	__FLT_MAX_EXP__
82#define DBL_MAX_EXP	__DBL_MAX_EXP__
83#define LDBL_MAX_EXP	__LDBL_MAX_EXP__
84
85/* Maximum integer such that 10 raised to that power is in the range of
86   representable finite floating-point numbers,
87
88	floor(log10((1 - b**-p) * b**emax))
89*/
90#undef FLT_MAX_10_EXP
91#undef DBL_MAX_10_EXP
92#undef LDBL_MAX_10_EXP
93#define FLT_MAX_10_EXP	__FLT_MAX_10_EXP__
94#define DBL_MAX_10_EXP	__DBL_MAX_10_EXP__
95#define LDBL_MAX_10_EXP	__LDBL_MAX_10_EXP__
96
97/* Maximum representable finite floating-point number,
98
99	(1 - b**-p) * b**emax
100*/
101#undef FLT_MAX
102#undef DBL_MAX
103#undef LDBL_MAX
104#define FLT_MAX		__FLT_MAX__
105#define DBL_MAX		__DBL_MAX__
106#define LDBL_MAX	__LDBL_MAX__
107
108/* The difference between 1 and the least value greater than 1 that is
109   representable in the given floating point type, b**1-p.  */
110#undef FLT_EPSILON
111#undef DBL_EPSILON
112#undef LDBL_EPSILON
113#define FLT_EPSILON	__FLT_EPSILON__
114#define DBL_EPSILON	__DBL_EPSILON__
115#define LDBL_EPSILON	__LDBL_EPSILON__
116
117/* Minimum normalized positive floating-point number, b**(emin - 1).  */
118#undef FLT_MIN
119#undef DBL_MIN
120#undef LDBL_MIN
121#define FLT_MIN		__FLT_MIN__
122#define DBL_MIN		__DBL_MIN__
123#define LDBL_MIN	__LDBL_MIN__
124
125/* Addition rounds to 0: zero, 1: nearest, 2: +inf, 3: -inf, -1: unknown.  */
126/* ??? This is supposed to change with calls to fesetround in <fenv.h>.  */
127#undef FLT_ROUNDS
128#define FLT_ROUNDS 1
129
130#if defined (__STDC_VERSION__) && __STDC_VERSION__ >= 199901L
131/* The floating-point expression evaluation method.
132        -1  indeterminate
133         0  evaluate all operations and constants just to the range and
134            precision of the type
135         1  evaluate operations and constants of type float and double
136            to the range and precision of the double type, evaluate
137            long double operations and constants to the range and
138            precision of the long double type
139         2  evaluate all operations and constants to the range and
140            precision of the long double type
141
142   ??? This ought to change with the setting of the fp control word;
143   the value provided by the compiler assumes the widest setting.  */
144#undef FLT_EVAL_METHOD
145#define FLT_EVAL_METHOD	__FLT_EVAL_METHOD__
146
147/* Number of decimal digits, n, such that any floating-point number in the
148   widest supported floating type with pmax radix b digits can be rounded
149   to a floating-point number with n decimal digits and back again without
150   change to the value,
151
152	pmax * log10(b)			if b is a power of 10
153	ceil(1 + pmax * log10(b))	otherwise
154*/
155#undef DECIMAL_DIG
156#define DECIMAL_DIG	__DECIMAL_DIG__
157
158#endif /* C99 */
159
160#if defined (__STDC_VERSION__) && __STDC_VERSION__ >= 201112L
161/* Versions of DECIMAL_DIG for each floating-point type.  */
162#undef FLT_DECIMAL_DIG
163#undef DBL_DECIMAL_DIG
164#undef LDBL_DECIMAL_DIG
165#define FLT_DECIMAL_DIG		__FLT_DECIMAL_DIG__
166#define DBL_DECIMAL_DIG		__DBL_DECIMAL_DIG__
167#define LDBL_DECIMAL_DIG	__DECIMAL_DIG__
168
169/* Whether types support subnormal numbers.  */
170#undef FLT_HAS_SUBNORM
171#undef DBL_HAS_SUBNORM
172#undef LDBL_HAS_SUBNORM
173#define FLT_HAS_SUBNORM		__FLT_HAS_DENORM__
174#define DBL_HAS_SUBNORM		__DBL_HAS_DENORM__
175#define LDBL_HAS_SUBNORM	__LDBL_HAS_DENORM__
176
177/* Minimum positive values, including subnormals.  */
178#undef FLT_TRUE_MIN
179#undef DBL_TRUE_MIN
180#undef LDBL_TRUE_MIN
181#if __FLT_HAS_DENORM__
182#define FLT_TRUE_MIN	__FLT_DENORM_MIN__
183#else
184#define FLT_TRUE_MIN	__FLT_MIN__
185#endif
186#if __DBL_HAS_DENORM__
187#define DBL_TRUE_MIN	__DBL_DENORM_MIN__
188#else
189#define DBL_TRUE_MIN	__DBL_MIN__
190#endif
191#if __LDBL_HAS_DENORM__
192#define LDBL_TRUE_MIN	__LDBL_DENORM_MIN__
193#else
194#define LDBL_TRUE_MIN	__LDBL_MIN__
195#endif
196
197#endif /* C11 */
198
199#ifdef __STDC_WANT_DEC_FP__
200/* Draft Technical Report 24732, extension for decimal floating-point
201   arithmetic: Characteristic of decimal floating types <float.h>.  */
202
203/* Number of base-FLT_RADIX digits in the significand, p.  */
204#undef DEC32_MANT_DIG
205#undef DEC64_MANT_DIG
206#undef DEC128_MANT_DIG
207#define DEC32_MANT_DIG	__DEC32_MANT_DIG__
208#define DEC64_MANT_DIG	__DEC64_MANT_DIG__
209#define DEC128_MANT_DIG	__DEC128_MANT_DIG__
210
211/* Minimum exponent. */
212#undef DEC32_MIN_EXP
213#undef DEC64_MIN_EXP
214#undef DEC128_MIN_EXP
215#define DEC32_MIN_EXP	__DEC32_MIN_EXP__
216#define DEC64_MIN_EXP	__DEC64_MIN_EXP__
217#define DEC128_MIN_EXP	__DEC128_MIN_EXP__
218
219/* Maximum exponent. */
220#undef DEC32_MAX_EXP
221#undef DEC64_MAX_EXP
222#undef DEC128_MAX_EXP
223#define DEC32_MAX_EXP	__DEC32_MAX_EXP__
224#define DEC64_MAX_EXP	__DEC64_MAX_EXP__
225#define DEC128_MAX_EXP	__DEC128_MAX_EXP__
226
227/* Maximum representable finite decimal floating-point number
228   (there are 6, 15, and 33 9s after the decimal points respectively). */
229#undef DEC32_MAX
230#undef DEC64_MAX
231#undef DEC128_MAX
232#define DEC32_MAX   __DEC32_MAX__
233#define DEC64_MAX   __DEC64_MAX__
234#define DEC128_MAX  __DEC128_MAX__
235
236/* The difference between 1 and the least value greater than 1 that is
237   representable in the given floating point type. */
238#undef DEC32_EPSILON
239#undef DEC64_EPSILON
240#undef DEC128_EPSILON
241#define DEC32_EPSILON	__DEC32_EPSILON__
242#define DEC64_EPSILON	__DEC64_EPSILON__
243#define DEC128_EPSILON	__DEC128_EPSILON__
244
245/* Minimum normalized positive floating-point number. */
246#undef DEC32_MIN
247#undef DEC64_MIN
248#undef DEC128_MIN
249#define DEC32_MIN	__DEC32_MIN__
250#define DEC64_MIN	__DEC64_MIN__
251#define DEC128_MIN	__DEC128_MIN__
252
253/* Minimum subnormal positive floating-point number. */
254#undef DEC32_SUBNORMAL_MIN
255#undef DEC64_SUBNORMAL_MIN
256#undef DEC128_SUBNORMAL_MIN
257#define DEC32_SUBNORMAL_MIN       __DEC32_SUBNORMAL_MIN__
258#define DEC64_SUBNORMAL_MIN       __DEC64_SUBNORMAL_MIN__
259#define DEC128_SUBNORMAL_MIN      __DEC128_SUBNORMAL_MIN__
260
261/* The floating-point expression evaluation method.
262         -1  indeterminate
263         0  evaluate all operations and constants just to the range and
264            precision of the type
265         1  evaluate operations and constants of type _Decimal32
266	    and _Decimal64 to the range and precision of the _Decimal64
267            type, evaluate _Decimal128 operations and constants to the
268	    range and precision of the _Decimal128 type;
269	 2  evaluate all operations and constants to the range and
270	    precision of the _Decimal128 type.  */
271
272#undef DEC_EVAL_METHOD
273#define DEC_EVAL_METHOD	__DEC_EVAL_METHOD__
274
275#endif /* __STDC_WANT_DEC_FP__ */
276
277#endif /* _FLOAT_H___ */
278