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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 #define _DN_SAVE 0x00000000
63 #define _DN_FLUSH 0x01000000
64 #define _DN_FLUSH_OPERANDS_SAVE_RESULTS 0x02000000
65 #define _DN_SAVE_OPERANDS_FLUSH_RESULTS 0x03000000
66 
67 /* These are also defined in Mingw math.h, needed to work around
68  GCC build issues. */
69 /* Return values for fpclass. */
70 #ifndef __MINGW_FPCLASS_DEFINED
71 #define __MINGW_FPCLASS_DEFINED 1
72 #define _FPCLASS_SNAN 0x0001 /* Signaling "Not a Number" */
73 #define _FPCLASS_QNAN 0x0002 /* Quiet "Not a Number" */
74 #define _FPCLASS_NINF 0x0004 /* Negative Infinity */
75 #define _FPCLASS_NN 0x0008 /* Negative Normal */
76 #define _FPCLASS_ND 0x0010 /* Negative Denormal */
77 #define _FPCLASS_NZ 0x0020 /* Negative Zero */
78 #define _FPCLASS_PZ 0x0040 /* Positive Zero */
79 #define _FPCLASS_PD 0x0080 /* Positive Denormal */
80 #define _FPCLASS_PN 0x0100 /* Positive Normal */
81 #define _FPCLASS_PINF 0x0200 /* Positive Infinity */
82 #endif /* __MINGW_FPCLASS_DEFINED */
83 
84 /* _statusfp bit flags */
85 #define _SW_INEXACT 0x00000001 /* inexact (precision) */
86 #define _SW_UNDERFLOW 0x00000002 /* underflow */
87 #define _SW_OVERFLOW 0x00000004 /* overflow */
88 #define _SW_ZERODIVIDE 0x00000008 /* zero divide */
89 #define _SW_INVALID 0x00000010 /* invalid */
90 #define _SW_DENORMAL 0x00080000 /* denormal status bit */
91 
92 /* invalid subconditions (_SW_INVALID also set) */
93 #define _SW_UNEMULATED 0x0040 /* unemulated instruction */
94 #define _SW_SQRTNEG 0x0080 /* square root of a neg number */
95 #define _SW_STACKOVERFLOW 0x0200 /* FP stack overflow */
96 #define _SW_STACKUNDERFLOW 0x0400 /* FP stack underflow */
97 
98 /* Floating point error signals and return codes */
99 #define _FPE_INVALID 0x81
100 #define _FPE_DENORMAL 0x82
101 #define _FPE_ZERODIVIDE 0x83
102 #define _FPE_OVERFLOW 0x84
103 #define _FPE_UNDERFLOW 0x85
104 #define _FPE_INEXACT 0x86
105 #define _FPE_UNEMULATED 0x87
106 #define _FPE_SQRTNEG 0x88
107 #define _FPE_STACKOVERFLOW 0x8a
108 #define _FPE_STACKUNDERFLOW 0x8b
109 #define _FPE_EXPLICITGEN 0x8c /* raise( SIGFPE ); */
110 
111 #ifndef RC_INVOKED
112 
113 #ifdef __cplusplus
114 extern "C" {
115 #endif
116 
117 /* Set the FPU control word as cw = (cw & ~unMask) | (unNew & unMask),
118  * i.e. change the bits in unMask to have the values they have in unNew,
119  * leaving other bits unchanged. */
120 
122 _CRTIMP
123 unsigned int
124 __cdecl
125 _controlfp(
126  _In_ unsigned int unNew,
127  _In_ unsigned int unMask);
128 
130 _CRTIMP
131 unsigned int
132 __cdecl
133 _control87(
134  _In_ unsigned int unNew,
135  _In_ unsigned int unMask);
136 
137 __MINGW_NOTHROW _CRTIMP unsigned int __cdecl _clearfp (void); /* Clear the FPU status word */
138 __MINGW_NOTHROW _CRTIMP unsigned int __cdecl _statusfp (void); /* Report the FPU status word */
139 #define _clear87 _clearfp
140 #define _status87 _statusfp
141 
142 
143 /*
144  MSVCRT.dll _fpreset initializes the control register to 0x27f,
145  the status register to zero and the tag word to 0FFFFh.
146  This differs from asm instruction finit/fninit which set control
147  word to 0x37f (64 bit mantissa precison rather than 53 bit).
148  By default, the mingw version of _fpreset sets fp control as
149  per fninit. To use the MSVCRT.dll _fpreset, include CRT_fp8.o when
150  building your application.
151 */
152 __MINGW_NOTHROW void __cdecl _fpreset (void);
153 __MINGW_NOTHROW void __cdecl fpreset (void);
154 
155 /* Global 'variable' for the current floating point error code. */
157 #define _fpecode (*(__fpecode()))
158 
159 /*
160  * IEEE recommended functions. MS puts them in float.h
161  * but they really belong in math.h.
162  */
163 
166 _CRTIMP
167 double
168 __cdecl
169 _chgsign(
170  _In_ double);
171 
174 _CRTIMP
175 double
176 __cdecl
177 _copysign(
178  _In_ double,
179  _In_ double);
180 
183 _CRTIMP
184 double
185 __cdecl
186 _logb(
187  _In_ double);
188 
191 _CRTIMP
192 double
193 __cdecl
194 _nextafter(
195  _In_ double,
196  _In_ double);
197 
200 _CRTIMP
201 double
202 __cdecl
203 _scalb(
204  _In_ double,
205  _In_ long);
206 
209 _CRTIMP
210 int
211 __cdecl
212 _finite(
213  _In_ double);
214 
217 _CRTIMP
218 int
219 __cdecl
220 _fpclass(
221  _In_ double);
222 
225 _CRTIMP
226 int
227 __cdecl
228 _isnan(
229  _In_ double);
230 
231 #ifdef __cplusplus
232 }
233 #endif
234 
235 #endif /* Not RC_INVOKED */
236 
237 #endif /* Not __STRICT_ANSI__ */
238 
239 #endif /* _MINGW_FLOAT_H_ */
__MINGW_NOTHROW _CRTIMP unsigned int __cdecl _statusfp(void)
Definition: _statusfp.c:11
_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:11
_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)