1/*
2 * float.h
3 * This file has no copyright assigned and is placed in the Public Domain.
4 * This file is part of the mingw-runtime package.
5 * No warranty is given; refer to the file DISCLAIMER.PD within the package.
6 *
7 * Constants related to floating point arithmetic.
8 *
9 * Also included here are some non-ANSI bits for accessing the floating
10 * point controller.
11 *
12 */
13
14#if defined(__LIBMSVCRT__)
15/* When building mingw-w64, this should be blank. */
16#define _SECIMP
17#else
18#ifndef _SECIMP
19#define _SECIMP __declspec(dllimport)
20#endif /* _SECIMP */
21#endif /* defined(__LIBMSVCRT__) */
22
23#if (defined (__GNUC__) && defined (__GNUC_MINOR__)) \
24 || (defined(__clang__) && defined(__clang_major__))
25#if (__GNUC__ < 4 || (__GNUC__ == 4 && __GNUC_MINOR__ < 6)) \
26 || (__clang_major__ >=3)
27#if !defined(_FLOAT_H___) && !defined(__FLOAT_H) && !defined(__CLANG_FLOAT_H)
28#include_next <float.h>
29#endif
30#elif !defined (_FLOAT_H___)
31#if (__GNUC__ < 4)
32#error Corrupt install of gcc-s internal headers, or search order was changed.
33#else
34 /* #include_next <float_ginclude.h> */
35
36 /* Number of decimal digits, q, such that any floating-point number with q
37 decimal digits can be rounded into a floating-point number with p radix b
38 digits and back again without change to the q decimal digits,
39
40 p * log10(b) if b is a power of 10
41 floor((p - 1) * log10(b)) otherwise
42 */
43 #undef FLT_DIG
44 #undef DBL_DIG
45 #undef LDBL_DIG
46 #define FLT_DIG __FLT_DIG__
47 #define DBL_DIG __DBL_DIG__
48 #define LDBL_DIG __LDBL_DIG__
49
50
51 /* Maximum representable finite floating-point number,
52
53 (1 - b**-p) * b**emax
54 */
55 #undef FLT_MAX
56 #undef DBL_MAX
57 #undef LDBL_MAX
58 #define FLT_MAX __FLT_MAX__
59 #define DBL_MAX __DBL_MAX__
60 #define LDBL_MAX __LDBL_MAX__
61
62
63 /* Minimum normalized positive floating-point number, b**(emin - 1). */
64 #undef FLT_MIN
65 #undef DBL_MIN
66 #undef LDBL_MIN
67 #define FLT_MIN __FLT_MIN__
68 #define DBL_MIN __DBL_MIN__
69 #define LDBL_MIN __LDBL_MIN__
70
71 /* Needed for libjava building - Victor K. */
72
73 /* Radix of exponent representation, b. */
74 #undef FLT_RADIX
75 #define FLT_RADIX __FLT_RADIX__
76
77 /* Minimum int x such that FLT_RADIX**(x-1) is a normalized float, emin */
78 #undef FLT_MIN_EXP
79 #undef DBL_MIN_EXP
80 #undef LDBL_MIN_EXP
81 #define FLT_MIN_EXP __FLT_MIN_EXP__
82 #define DBL_MIN_EXP __DBL_MIN_EXP__
83 #define LDBL_MIN_EXP __LDBL_MIN_EXP__
84
85 /* Minimum negative integer such that 10 raised to that power is in the
86 range of normalized floating-point numbers,
87
88 ceil(log10(b) * (emin - 1))
89 */
90 #undef FLT_MIN_10_EXP
91 #undef DBL_MIN_10_EXP
92 #undef LDBL_MIN_10_EXP
93 #define FLT_MIN_10_EXP __FLT_MIN_10_EXP__
94 #define DBL_MIN_10_EXP __DBL_MIN_10_EXP__
95 #define LDBL_MIN_10_EXP __LDBL_MIN_10_EXP__
96
97 /* Maximum int x such that FLT_RADIX**(x-1) is a representable float, emax. */
98 #undef FLT_MAX_EXP
99 #undef DBL_MAX_EXP
100 #undef LDBL_MAX_EXP
101 #define FLT_MAX_EXP __FLT_MAX_EXP__
102 #define DBL_MAX_EXP __DBL_MAX_EXP__
103 #define LDBL_MAX_EXP __LDBL_MAX_EXP__
104
105 /* Maximum integer such that 10 raised to that power is in the range of
106 representable finite floating-point numbers,
107
108 floor(log10((1 - b**-p) * b**emax))
109 */
110 #undef FLT_MAX_10_EXP
111 #undef DBL_MAX_10_EXP
112 #undef LDBL_MAX_10_EXP
113 #define FLT_MAX_10_EXP __FLT_MAX_10_EXP__
114 #define DBL_MAX_10_EXP __DBL_MAX_10_EXP__
115 #define LDBL_MAX_10_EXP __LDBL_MAX_10_EXP__
116
117 /* Addition rounds to 0: zero, 1: nearest, 2: +inf, 3: -inf, -1: unknown. */
118 /* ??? This is supposed to change with calls to fesetround in <fenv.h>. */
119 #undef FLT_ROUNDS
120 #define FLT_ROUNDS 1
121
122 #undef FLT_EPSILON
123 #undef DBL_EPSILON
124 #undef LDBL_EPSILON
125 #define FLT_EPSILON __FLT_EPSILON__
126 #define DBL_EPSILON __DBL_EPSILON__
127 #define LDBL_EPSILON __LDBL_EPSILON__
128
129 #define _FLOAT_H___
130#endif
131#endif
132#endif
133
134#ifndef _MINGW_FLOAT_H_
135#define _MINGW_FLOAT_H_
136
137/* All the headers include this file. */
138#include <crtdefs.h>
139
140/*
141 * Functions and definitions for controlling the FPU.
142 */
143
144/* TODO: These constants are only valid for x86 machines */
145
146/* Control word masks for unMask */
147#define _MCW_DN 0x03000000 /* Denormal control */
148#define _MCW_EM 0x0008001F /* Error masks */
149#define _MCW_IC 0x00040000 /* Infinity */
150#define _MCW_RC 0x00000300 /* Rounding */
151#define _MCW_PC 0x00030000 /* Precision */
152
153/* Number of base-FLT_RADIX digits in the significand, p. */
154#undef FLT_MANT_DIG
155#undef DBL_MANT_DIG
156#undef LDBL_MANT_DIG
157#define FLT_MANT_DIG __FLT_MANT_DIG__
158#define DBL_MANT_DIG __DBL_MANT_DIG__
159#define LDBL_MANT_DIG __LDBL_MANT_DIG__
160
161#if defined (__STDC_VERSION__) && __STDC_VERSION__ >= 199901L
162/* The floating-point expression evaluation method.
163 -1 indeterminate
164 0 evaluate all operations and constants just to the range and
165 precision of the type
166 1 evaluate operations and constants of type float and double
167 to the range and precision of the double type, evaluate
168 long double operations and constants to the range and
169 precision of the long double type
170 2 evaluate all operations and constants to the range and
171 precision of the long double type
172
173 ??? This ought to change with the setting of the fp control word;
174 the value provided by the compiler assumes the widest setting. */
175#undef FLT_EVAL_METHOD
176#define FLT_EVAL_METHOD __FLT_EVAL_METHOD__
177
178#endif /* C99 */
179
180
181/* Control word values for unNew (use with related unMask above) */
182#define _DN_SAVE 0x00000000
183#define _DN_FLUSH 0x01000000
184#define _DN_FLUSH_OPERANDS_SAVE_RESULTS 0x02000000
185#define _DN_SAVE_OPERANDS_FLUSH_RESULTS 0x03000000
186#define _EM_INVALID 0x00000010
187#define _EM_DENORMAL 0x00080000
188#define _EM_ZERODIVIDE 0x00000008
189#define _EM_OVERFLOW 0x00000004
190#define _EM_UNDERFLOW 0x00000002
191#define _EM_INEXACT 0x00000001
192#define _IC_AFFINE 0x00040000
193#define _IC_PROJECTIVE 0x00000000
194#define _RC_CHOP 0x00000300
195#define _RC_UP 0x00000200
196#define _RC_DOWN 0x00000100
197#define _RC_NEAR 0x00000000
198#define _PC_24 0x00020000
199#define _PC_53 0x00010000
200#define _PC_64 0x00000000
201#define _EM_AMBIGUOUS 0x80000000
202
203/* These are also defined in Mingw math.h, needed to work around
204 GCC build issues. */
205/* Return values for fpclass. */
206#ifndef __MINGW_FPCLASS_DEFINED
207#define __MINGW_FPCLASS_DEFINED 1
208#define _FPCLASS_SNAN 0x0001 /* Signaling "Not a Number" */
209#define _FPCLASS_QNAN 0x0002 /* Quiet "Not a Number" */
210#define _FPCLASS_NINF 0x0004 /* Negative Infinity */
211#define _FPCLASS_NN 0x0008 /* Negative Normal */
212#define _FPCLASS_ND 0x0010 /* Negative Denormal */
213#define _FPCLASS_NZ 0x0020 /* Negative Zero */
214#define _FPCLASS_PZ 0x0040 /* Positive Zero */
215#define _FPCLASS_PD 0x0080 /* Positive Denormal */
216#define _FPCLASS_PN 0x0100 /* Positive Normal */
217#define _FPCLASS_PINF 0x0200 /* Positive Infinity */
218#endif /* __MINGW_FPCLASS_DEFINED */
219
220/* _statusfp bit flags */
221#define _SW_INEXACT 0x00000001 /* inexact (precision) */
222#define _SW_UNDERFLOW 0x00000002 /* underflow */
223#define _SW_OVERFLOW 0x00000004 /* overflow */
224#define _SW_ZERODIVIDE 0x00000008 /* zero divide */
225#define _SW_INVALID 0x00000010 /* invalid */
226#define _SW_DENORMAL 0x00080000 /* denormal status bit */
227
228/* invalid subconditions (_SW_INVALID also set) */
229#define _SW_UNEMULATED 0x0040 /* unemulated instruction */
230#define _SW_SQRTNEG 0x0080 /* square root of a neg number */
231#define _SW_STACKOVERFLOW 0x0200 /* FP stack overflow */
232#define _SW_STACKUNDERFLOW 0x0400 /* FP stack underflow */
233
234/* Floating point error signals and return codes */
235#define _FPE_INVALID 0x81
236#define _FPE_DENORMAL 0x82
237#define _FPE_ZERODIVIDE 0x83
238#define _FPE_OVERFLOW 0x84
239#define _FPE_UNDERFLOW 0x85
240#define _FPE_INEXACT 0x86
241#define _FPE_UNEMULATED 0x87
242#define _FPE_SQRTNEG 0x88
243#define _FPE_STACKOVERFLOW 0x8a
244#define _FPE_STACKUNDERFLOW 0x8b
245#define _FPE_EXPLICITGEN 0x8c /* raise( SIGFPE ); */
246#define _FPE_MULTIPLE_TRAPS 0x8d
247#define _FPE_MULTIPLE_FAULTS 0x8e
248
249#ifndef __STRICT_ANSI__
250#define CW_DEFAULT _CW_DEFAULT
251#define MCW_PC _MCW_PC
252#define PC_24 _PC_24
253#define PC_53 _PC_53
254#define PC_64 _PC_64
255#endif /* Not __STRICT_ANSI__ */
256
257#if defined(__i386__)
258#define _CW_DEFAULT (_RC_NEAR+_PC_53+_EM_INVALID+_EM_ZERODIVIDE+_EM_OVERFLOW+_EM_UNDERFLOW+_EM_INEXACT+_EM_DENORMAL)
259#elif defined(__ia64__)
260#define _CW_DEFAULT (_RC_NEAR+_PC_64+_EM_INVALID+_EM_ZERODIVIDE+_EM_OVERFLOW+_EM_UNDERFLOW+_EM_INEXACT+_EM_DENORMAL)
261#elif defined(__x86_64__) || defined(__arm__) || defined(__aarch64__)
262#define _CW_DEFAULT (_RC_NEAR+_EM_INVALID+_EM_ZERODIVIDE+_EM_OVERFLOW+_EM_UNDERFLOW+_EM_INEXACT+_EM_DENORMAL)
263#endif
264
265#ifndef RC_INVOKED
266
267#ifdef __cplusplus
268extern "C" {
269#endif
270
271/* Set the FPU control word as cw = (cw & ~unMask) | (unNew & unMask),
272 * i.e. change the bits in unMask to have the values they have in unNew,
273 * leaving other bits unchanged. */
274_CRTIMP unsigned int __cdecl __MINGW_NOTHROW _controlfp (unsigned int _NewValue, unsigned int _Mask) __MINGW_ATTRIB_DEPRECATED_SEC_WARN;
275_SECIMP errno_t __cdecl _controlfp_s(unsigned int *_CurrentState, unsigned int _NewValue, unsigned int _Mask);
276_CRTIMP unsigned int __cdecl __MINGW_NOTHROW _control87 (unsigned int _NewValue, unsigned int _Mask);
277#ifdef __i386__
278_CRTIMP int __cdecl __control87_2(unsigned int, unsigned int, unsigned int *, unsigned int *);
279#endif
280
281
282_CRTIMP unsigned int __cdecl __MINGW_NOTHROW _clearfp (void); /* Clear the FPU status word */
283_CRTIMP unsigned int __cdecl __MINGW_NOTHROW _statusfp (void); /* Report the FPU status word */
284#define _clear87 _clearfp
285#define _status87 _statusfp
286
287
288/*
289 MSVCRT.dll _fpreset initializes the control register to 0x27f,
290 the status register to zero and the tag word to 0FFFFh.
291 This differs from asm instruction finit/fninit which set control
292 word to 0x37f (64 bit mantissa precison rather than 53 bit).
293 By default, the mingw version of _fpreset sets fp control as
294 per fninit. To use the MSVCRT.dll _fpreset, include CRT_fp8.o when
295 building your application.
296*/
297void __cdecl __MINGW_NOTHROW _fpreset (void);
298#ifndef __STRICT_ANSI__
299void __cdecl __MINGW_NOTHROW fpreset (void);
300#endif /* Not __STRICT_ANSI__ */
301
302/* Global 'variable' for the current floating point error code. */
303_CRTIMP int * __cdecl __MINGW_NOTHROW __fpecode(void);
304#define _fpecode (*(__fpecode()))
305
306/*
307 * IEEE recommended functions. MS puts them in float.h
308 * but they really belong in math.h.
309 */
310
311#ifndef _SIGN_DEFINED
312#define _SIGN_DEFINED
313_CRTIMP double __cdecl __MINGW_NOTHROW _chgsign (double _X);
314_CRTIMP double __cdecl __MINGW_NOTHROW _copysign (double _Number,double _Sign);
315_CRTIMP double __cdecl __MINGW_NOTHROW _logb (double);
316_CRTIMP double __cdecl __MINGW_NOTHROW _nextafter (double, double);
317_CRTIMP double __cdecl __MINGW_NOTHROW _scalb (double, long);
318
319_CRTIMP int __cdecl __MINGW_NOTHROW _finite (double);
320_CRTIMP int __cdecl __MINGW_NOTHROW _fpclass (double);
321_CRTIMP int __cdecl __MINGW_NOTHROW _isnan (double);
322
323#define _copysignl copysignl
324extern long double __cdecl _chgsignl (long double);
325#endif /* _SIGN_DEFINED */
326
327#ifdef __cplusplus
328}
329#endif
330
331#endif /* Not RC_INVOKED */
332
333#endif /* _MINGW_FLOAT_H_ */
334