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24 #ifndef _MINGW_FLOAT_H_
25 #define _MINGW_FLOAT_H_
26 #pragma GCC system_header
30 * Constants related to floating point arithmetic.
32 * Also included here are some non-ANSI bits for accessing the floating
37 * GCC provides float.h, but it doesn't include the non-standard stuff for
38 * accessing the fp controller. We parse the GCC-supplied header, for its
39 * standard content, and then define the MS-specific extensions here.
41 * In a MinGW standard Win32 hosted environment, this should be the float.h
42 * found by a system include path search, but this can't be guaranteed; for
43 * a cross-compiler setup, the GCC-supplied header, which is guarded by the
44 * _FLOAT_H___ macro, may be found first, thus...
47 #if !defined(_FLOAT_H___) && !defined(__FLOAT_H)
50 * ...when we didn't find the GCC-supplied header first, we want to pull
51 * it in now; include_next should achieve this, (and we must rely on the
52 * GCC header maintainers to extend us the same courtesy, to get this one
53 * pulled in, when the GCC-supplied header is found first).
56 # include_next <float.h>
60 * Functions and definitions for controlling the FPU.
62 #ifndef __STRICT_ANSI__
64 /* TODO: These constants are only valid for x86 machines */
66 /* Control word masks for unMask */
67 #define _MCW_EM 0x0008001F /* Error masks */
68 #define _MCW_IC 0x00040000 /* Infinity */
69 #define _MCW_RC 0x00000300 /* Rounding */
70 #define _MCW_PC 0x00030000 /* Precision */
72 /* Control word values for unNew (use with related unMask above) */
73 #define _EM_INVALID 0x00000010
74 #define _EM_DENORMAL 0x00080000
75 #define _EM_ZERODIVIDE 0x00000008
76 #define _EM_OVERFLOW 0x00000004
77 #define _EM_UNDERFLOW 0x00000002
78 #define _EM_INEXACT 0x00000001
79 #define _IC_AFFINE 0x00040000
80 #define _IC_PROJECTIVE 0x00000000
81 #define _RC_CHOP 0x00000300
82 #define _RC_UP 0x00000200
83 #define _RC_DOWN 0x00000100
84 #define _RC_NEAR 0x00000000
85 #define _PC_24 0x00020000
86 #define _PC_53 0x00010000
87 #define _PC_64 0x00000000
89 /* These are also defined in Mingw math.h, needed to work around
91 /* Return values for fpclass. */
92 #ifndef __MINGW_FPCLASS_DEFINED
93 #define __MINGW_FPCLASS_DEFINED 1
94 #define _FPCLASS_SNAN 0x0001 /* Signaling "Not a Number" */
95 #define _FPCLASS_QNAN 0x0002 /* Quiet "Not a Number" */
96 #define _FPCLASS_NINF 0x0004 /* Negative Infinity */
97 #define _FPCLASS_NN 0x0008 /* Negative Normal */
98 #define _FPCLASS_ND 0x0010 /* Negative Denormal */
99 #define _FPCLASS_NZ 0x0020 /* Negative Zero */
100 #define _FPCLASS_PZ 0x0040 /* Positive Zero */
101 #define _FPCLASS_PD 0x0080 /* Positive Denormal */
102 #define _FPCLASS_PN 0x0100 /* Positive Normal */
103 #define _FPCLASS_PINF 0x0200 /* Positive Infinity */
104 #endif /* __MINGW_FPCLASS_DEFINED */
106 /* invalid subconditions (_SW_INVALID also set) */
107 #define _SW_UNEMULATED 0x0040 /* unemulated instruction */
108 #define _SW_SQRTNEG 0x0080 /* square root of a neg number */
109 #define _SW_STACKOVERFLOW 0x0200 /* FP stack overflow */
110 #define _SW_STACKUNDERFLOW 0x0400 /* FP stack underflow */
112 /* Floating point error signals and return codes */
113 #define _FPE_INVALID 0x81
114 #define _FPE_DENORMAL 0x82
115 #define _FPE_ZERODIVIDE 0x83
116 #define _FPE_OVERFLOW 0x84
117 #define _FPE_UNDERFLOW 0x85
118 #define _FPE_INEXACT 0x86
119 #define _FPE_UNEMULATED 0x87
120 #define _FPE_SQRTNEG 0x88
121 #define _FPE_STACKOVERFLOW 0x8a
122 #define _FPE_STACKUNDERFLOW 0x8b
123 #define _FPE_EXPLICITGEN 0x8c /* raise( SIGFPE ); */
131 /* Set the FPU control word as cw = (cw & ~unMask) | (unNew & unMask),
132 * i.e. change the bits in unMask to have the values they have in unNew,
133 * leaving other bits unchanged. */
134 _CRTIMP unsigned int __cdecl __MINGW_NOTHROW _controlfp (unsigned int unNew, unsigned int unMask);
135 _CRTIMP unsigned int __cdecl __MINGW_NOTHROW _control87 (unsigned int unNew, unsigned int unMask);
138 _CRTIMP unsigned int __cdecl __MINGW_NOTHROW _clearfp (void); /* Clear the FPU status word */
139 _CRTIMP unsigned int __cdecl __MINGW_NOTHROW _statusfp (void); /* Report the FPU status word */
140 #define _clear87 _clearfp
141 #define _status87 _statusfp
145 MSVCRT.dll _fpreset initializes the control register to 0x27f,
146 the status register to zero and the tag word to 0FFFFh.
147 This differs from asm instruction finit/fninit which set control
148 word to 0x37f (64 bit mantissa precison rather than 53 bit).
149 By default, the mingw version of _fpreset sets fp control as
150 per fninit. To use the MSVCRT.dll _fpreset, include CRT_fp8.o when
151 building your application.
153 void __cdecl __MINGW_NOTHROW _fpreset (void);
154 void __cdecl __MINGW_NOTHROW fpreset (void);
156 /* Global 'variable' for the current floating point error code. */
157 _CRTIMP int * __cdecl __MINGW_NOTHROW __fpecode(void);
158 #define _fpecode (*(__fpecode()))
161 * IEEE recommended functions. MS puts them in float.h
162 * but they really belong in math.h.
165 _CRTIMP double __cdecl __MINGW_NOTHROW _chgsign (double);
166 _CRTIMP double __cdecl __MINGW_NOTHROW _copysign (double, double);
167 _CRTIMP double __cdecl __MINGW_NOTHROW _logb (double);
168 _CRTIMP double __cdecl __MINGW_NOTHROW _nextafter (double, double);
169 _CRTIMP double __cdecl __MINGW_NOTHROW _scalb (double, long);
171 _CRTIMP int __cdecl __MINGW_NOTHROW _finite (double);
172 _CRTIMP int __cdecl __MINGW_NOTHROW _fpclass (double);
173 _CRTIMP int __cdecl __MINGW_NOTHROW _isnan (double);
179 #endif /* Not RC_INVOKED */
181 #endif /* Not __STRICT_ANSI__ */
183 #endif /* _MINGW_FLOAT_H_ */