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float.h
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1 /*
2  * float.h
3  * This file has no copyright assigned and is placed in the Public Domain.
4  * This file is a part of the mingw-runtime package.
5  * No warranty is given; refer to the file DISCLAIMER 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  * NOTE: GCC provides float.h, but it doesn't include the non-standard
13  * stuff for accessing the fp controller. We include_next the
14  * GCC-supplied header and just define the MS-specific extensions
15  * here.
16  *
17  */
18 
19 #ifndef _MINGW_FLOAT_H_
20 #define _MINGW_FLOAT_H_
21 
22 #if defined(__GNUC__)
23 #include "mingw32/gcc_float.h"
24 #elif defined(_MSC_VER)
25 #include "msc/msc_float.h"
26 #else
27 #error
28 #endif
29 
30 #include <crtdefs.h>
31 
32 /*
33  * Functions and definitions for controlling the FPU.
34  */
35 #ifndef __STRICT_ANSI__
36 
37 /* TODO: These constants are only valid for x86 machines */
38 
39 /* Control word masks for unMask */
40 #define _MCW_EM 0x0008001F /* Error masks */
41 #define _MCW_IC 0x00040000 /* Infinity */
42 #define _MCW_RC 0x00000300 /* Rounding */
43 #define _MCW_PC 0x00030000 /* Precision */
44 #define _MCW_DN 0x03000000 /* Denormal */
45 
46 /* Control word values for unNew (use with related unMask above) */
47 #define _EM_INVALID 0x00000010
48 #define _EM_DENORMAL 0x00080000
49 #define _EM_ZERODIVIDE 0x00000008
50 #define _EM_OVERFLOW 0x00000004
51 #define _EM_UNDERFLOW 0x00000002
52 #define _EM_INEXACT 0x00000001
53 #define _IC_AFFINE 0x00040000
54 #define _IC_PROJECTIVE 0x00000000
55 #define _RC_CHOP 0x00000300
56 #define _RC_UP 0x00000200
57 #define _RC_DOWN 0x00000100
58 #define _RC_NEAR 0x00000000
59 #define _PC_24 0x00020000
60 #define _PC_53 0x00010000
61 #define _PC_64 0x00000000
62 
63 /* These are also defined in Mingw math.h, needed to work around
64  GCC build issues. */
65 /* Return values for fpclass. */
66 #ifndef __MINGW_FPCLASS_DEFINED
67 #define __MINGW_FPCLASS_DEFINED 1
68 #define _FPCLASS_SNAN 0x0001 /* Signaling "Not a Number" */
69 #define _FPCLASS_QNAN 0x0002 /* Quiet "Not a Number" */
70 #define _FPCLASS_NINF 0x0004 /* Negative Infinity */
71 #define _FPCLASS_NN 0x0008 /* Negative Normal */
72 #define _FPCLASS_ND 0x0010 /* Negative Denormal */
73 #define _FPCLASS_NZ 0x0020 /* Negative Zero */
74 #define _FPCLASS_PZ 0x0040 /* Positive Zero */
75 #define _FPCLASS_PD 0x0080 /* Positive Denormal */
76 #define _FPCLASS_PN 0x0100 /* Positive Normal */
77 #define _FPCLASS_PINF 0x0200 /* Positive Infinity */
78 #endif /* __MINGW_FPCLASS_DEFINED */
79 
80 /* _statusfp bit flags */
81 #define _SW_INEXACT 0x00000001 /* inexact (precision) */
82 #define _SW_UNDERFLOW 0x00000002 /* underflow */
83 #define _SW_OVERFLOW 0x00000004 /* overflow */
84 #define _SW_ZERODIVIDE 0x00000008 /* zero divide */
85 #define _SW_INVALID 0x00000010 /* invalid */
86 #define _SW_DENORMAL 0x00080000 /* denormal status bit */
87 
88 /* invalid subconditions (_SW_INVALID also set) */
89 #define _SW_UNEMULATED 0x0040 /* unemulated instruction */
90 #define _SW_SQRTNEG 0x0080 /* square root of a neg number */
91 #define _SW_STACKOVERFLOW 0x0200 /* FP stack overflow */
92 #define _SW_STACKUNDERFLOW 0x0400 /* FP stack underflow */
93 
94 /* Floating point error signals and return codes */
95 #define _FPE_INVALID 0x81
96 #define _FPE_DENORMAL 0x82
97 #define _FPE_ZERODIVIDE 0x83
98 #define _FPE_OVERFLOW 0x84
99 #define _FPE_UNDERFLOW 0x85
100 #define _FPE_INEXACT 0x86
101 #define _FPE_UNEMULATED 0x87
102 #define _FPE_SQRTNEG 0x88
103 #define _FPE_STACKOVERFLOW 0x8a
104 #define _FPE_STACKUNDERFLOW 0x8b
105 #define _FPE_EXPLICITGEN 0x8c /* raise( SIGFPE ); */
106 
107 #ifndef RC_INVOKED
108 
109 #ifdef __cplusplus
110 extern "C" {
111 #endif
112 
113 /* Set the FPU control word as cw = (cw & ~unMask) | (unNew & unMask),
114  * i.e. change the bits in unMask to have the values they have in unNew,
115  * leaving other bits unchanged. */
116 
118 _CRTIMP
119 unsigned int
120 __cdecl
121 _controlfp(
122  _In_ unsigned int unNew,
123  _In_ unsigned int unMask);
124 
126 _CRTIMP
127 unsigned int
128 __cdecl
129 _control87(
130  _In_ unsigned int unNew,
131  _In_ unsigned int unMask);
132 
133 __MINGW_NOTHROW _CRTIMP unsigned int __cdecl _clearfp (void); /* Clear the FPU status word */
134 __MINGW_NOTHROW _CRTIMP unsigned int __cdecl _statusfp (void); /* Report the FPU status word */
135 #define _clear87 _clearfp
136 #define _status87 _statusfp
137 
138 
139 /*
140  MSVCRT.dll _fpreset initializes the control register to 0x27f,
141  the status register to zero and the tag word to 0FFFFh.
142  This differs from asm instruction finit/fninit which set control
143  word to 0x37f (64 bit mantissa precison rather than 53 bit).
144  By default, the mingw version of _fpreset sets fp control as
145  per fninit. To use the MSVCRT.dll _fpreset, include CRT_fp8.o when
146  building your application.
147 */
148 __MINGW_NOTHROW void __cdecl _fpreset (void);
149 __MINGW_NOTHROW void __cdecl fpreset (void);
150 
151 /* Global 'variable' for the current floating point error code. */
153 #define _fpecode (*(__fpecode()))
154 
155 /*
156  * IEEE recommended functions. MS puts them in float.h
157  * but they really belong in math.h.
158  */
159 
162 _CRTIMP
163 double
164 __cdecl
165 _chgsign(
166  _In_ double);
167 
170 _CRTIMP
171 double
172 __cdecl
173 _copysign(
174  _In_ double,
175  _In_ double);
176 
179 _CRTIMP
180 double
181 __cdecl
182 _logb(
183  _In_ double);
184 
187 _CRTIMP
188 double
189 __cdecl
190 _nextafter(
191  _In_ double,
192  _In_ double);
193 
196 _CRTIMP
197 double
198 __cdecl
199 _scalb(
200  _In_ double,
201  _In_ long);
202 
205 _CRTIMP
206 int
207 __cdecl
208 _finite(
209  _In_ double);
210 
213 _CRTIMP
214 int
215 __cdecl
216 _fpclass(
217  _In_ double);
218 
221 _CRTIMP
222 int
223 __cdecl
224 _isnan(
225  _In_ double);
226 
227 #ifdef __cplusplus
228 }
229 #endif
230 
231 #endif /* Not RC_INVOKED */
232 
233 #endif /* Not __STRICT_ANSI__ */
234 
235 #endif /* _MINGW_FLOAT_H_ */
__MINGW_NOTHROW _CRTIMP unsigned int __cdecl _statusfp(void)
Definition: _statusfp.c:10
_Check_return_ __MINGW_NOTHROW _CRTIMP int __cdecl _isnan(_In_ double)
#define __cdecl
Definition: accygwin.h:79
__MINGW_NOTHROW void __cdecl _fpreset(void)
Definition: _fpreset.c:10
#define _CRTIMP
Definition: crtdefs.h:72
__MINGW_NOTHROW _CRTIMP unsigned int __cdecl _clearfp(void)
Definition: _clearfp.c:10
_Check_return_ __MINGW_NOTHROW _CRTIMP double __cdecl _copysign(_In_ double, _In_ double)
__MINGW_NOTHROW _CRTIMP unsigned int __cdecl _control87(_In_ unsigned int unNew, _In_ unsigned int unMask)
_Check_return_ __MINGW_NOTHROW _CRTIMP double __cdecl _scalb(_In_ double, _In_ long)
__MINGW_NOTHROW void __cdecl fpreset(void)
#define _In_
Definition: ms_sal.h:308
_Check_return_ __MINGW_NOTHROW _CRTIMP int __cdecl _finite(_In_ double)
_Check_return_ __MINGW_NOTHROW _CRTIMP double __cdecl _nextafter(_In_ double, _In_ double)
_Check_return_ __MINGW_NOTHROW _CRTIMP double __cdecl _chgsign(_In_ double)
#define __MINGW_NOTHROW
Definition: _mingw.h:156
_Check_return_ __MINGW_NOTHROW _CRTIMP double __cdecl _logb(_In_ double)
#define _Check_return_
Definition: ms_sal.h:557
__MINGW_NOTHROW _CRTIMP int *__cdecl __fpecode(void)
Definition: fpecode.c:16
_Check_return_ __MINGW_NOTHROW _CRTIMP int __cdecl _fpclass(_In_ double)
__MINGW_NOTHROW _CRTIMP unsigned int __cdecl _controlfp(_In_ unsigned int unNew, _In_ unsigned int unMask)