1 #ifndef _MINGW_FLOAT_H_
5 * This file has no copyright assigned and is placed in the Public Domain.
6 * This file is a part of the mingw-runtime package.
7 * No warranty is given; refer to the file DISCLAIMER within the package.
9 * Constants related to floating point arithmetic.
11 * Also included here are some non-ANSI bits for accessing the floating
15 #define _MINGW_FLOAT_H_
19 * GCC provides float.h, but it doesn't include the non-standard stuff for
20 * accessing the fp controller. We parse the GCC-supplied header, for its
21 * standard content, and then define the MS-specific extensions here.
23 * In a MinGW standard Win32 hosted environment, this should be the float.h
24 * found by a system include path search, but this can't be guaranteed; for
25 * a cross-compiler setup, the GCC-supplied header, which is guarded by the
26 * _FLOAT_H___ macro, may be found first, thus...
29 #if !defined(_FLOAT_H___) && !defined(__FLOAT_H)
32 * ...when we didn't find the GCC-supplied header first, we want to pull
33 * it in now; include_next should achieve this, (and we must rely on the
34 * GCC header maintainers to extend us the same courtesy, to get this one
35 * pulled in, when the GCC-supplied header is found first).
38 # include_next <float.h>
41 /* All the headers include this file. */
45 * Functions and definitions for controlling the FPU.
47 #ifndef __STRICT_ANSI__
49 /* TODO: These constants are only valid for x86 machines */
51 /* Control word masks for unMask */
52 #define _MCW_EM 0x0008001F /* Error masks */
53 #define _MCW_IC 0x00040000 /* Infinity */
54 #define _MCW_RC 0x00000300 /* Rounding */
55 #define _MCW_PC 0x00030000 /* Precision */
57 /* Control word values for unNew (use with related unMask above) */
58 #define _EM_INVALID 0x00000010
59 #define _EM_DENORMAL 0x00080000
60 #define _EM_ZERODIVIDE 0x00000008
61 #define _EM_OVERFLOW 0x00000004
62 #define _EM_UNDERFLOW 0x00000002
63 #define _EM_INEXACT 0x00000001
64 #define _IC_AFFINE 0x00040000
65 #define _IC_PROJECTIVE 0x00000000
66 #define _RC_CHOP 0x00000300
67 #define _RC_UP 0x00000200
68 #define _RC_DOWN 0x00000100
69 #define _RC_NEAR 0x00000000
70 #define _PC_24 0x00020000
71 #define _PC_53 0x00010000
72 #define _PC_64 0x00000000
74 /* These are also defined in Mingw math.h, needed to work around
76 /* Return values for fpclass. */
77 #ifndef __MINGW_FPCLASS_DEFINED
78 #define __MINGW_FPCLASS_DEFINED 1
79 #define _FPCLASS_SNAN 0x0001 /* Signaling "Not a Number" */
80 #define _FPCLASS_QNAN 0x0002 /* Quiet "Not a Number" */
81 #define _FPCLASS_NINF 0x0004 /* Negative Infinity */
82 #define _FPCLASS_NN 0x0008 /* Negative Normal */
83 #define _FPCLASS_ND 0x0010 /* Negative Denormal */
84 #define _FPCLASS_NZ 0x0020 /* Negative Zero */
85 #define _FPCLASS_PZ 0x0040 /* Positive Zero */
86 #define _FPCLASS_PD 0x0080 /* Positive Denormal */
87 #define _FPCLASS_PN 0x0100 /* Positive Normal */
88 #define _FPCLASS_PINF 0x0200 /* Positive Infinity */
89 #endif /* __MINGW_FPCLASS_DEFINED */
91 /* invalid subconditions (_SW_INVALID also set) */
92 #define _SW_UNEMULATED 0x0040 /* unemulated instruction */
93 #define _SW_SQRTNEG 0x0080 /* square root of a neg number */
94 #define _SW_STACKOVERFLOW 0x0200 /* FP stack overflow */
95 #define _SW_STACKUNDERFLOW 0x0400 /* FP stack underflow */
97 /* Floating point error signals and return codes */
98 #define _FPE_INVALID 0x81
99 #define _FPE_DENORMAL 0x82
100 #define _FPE_ZERODIVIDE 0x83
101 #define _FPE_OVERFLOW 0x84
102 #define _FPE_UNDERFLOW 0x85
103 #define _FPE_INEXACT 0x86
104 #define _FPE_UNEMULATED 0x87
105 #define _FPE_SQRTNEG 0x88
106 #define _FPE_STACKOVERFLOW 0x8a
107 #define _FPE_STACKUNDERFLOW 0x8b
108 #define _FPE_EXPLICITGEN 0x8c /* raise( SIGFPE ); */
116 /* Set the FPU control word as cw = (cw & ~unMask) | (unNew & unMask),
117 * i.e. change the bits in unMask to have the values they have in unNew,
118 * leaving other bits unchanged. */
119 _CRTIMP unsigned int __cdecl __MINGW_NOTHROW _controlfp (unsigned int unNew, unsigned int unMask);
120 _CRTIMP unsigned int __cdecl __MINGW_NOTHROW _control87 (unsigned int unNew, unsigned int unMask);
123 _CRTIMP unsigned int __cdecl __MINGW_NOTHROW _clearfp (void); /* Clear the FPU status word */
124 _CRTIMP unsigned int __cdecl __MINGW_NOTHROW _statusfp (void); /* Report the FPU status word */
125 #define _clear87 _clearfp
126 #define _status87 _statusfp
130 MSVCRT.dll _fpreset initializes the control register to 0x27f,
131 the status register to zero and the tag word to 0FFFFh.
132 This differs from asm instruction finit/fninit which set control
133 word to 0x37f (64 bit mantissa precison rather than 53 bit).
134 By default, the mingw version of _fpreset sets fp control as
135 per fninit. To use the MSVCRT.dll _fpreset, include CRT_fp8.o when
136 building your application.
138 void __cdecl __MINGW_NOTHROW _fpreset (void);
139 void __cdecl __MINGW_NOTHROW fpreset (void);
141 /* Global 'variable' for the current floating point error code. */
142 _CRTIMP int * __cdecl __MINGW_NOTHROW __fpecode(void);
143 #define _fpecode (*(__fpecode()))
146 * IEEE recommended functions. MS puts them in float.h
147 * but they really belong in math.h.
150 _CRTIMP double __cdecl __MINGW_NOTHROW _chgsign (double);
151 _CRTIMP double __cdecl __MINGW_NOTHROW _copysign (double, double);
152 _CRTIMP double __cdecl __MINGW_NOTHROW _logb (double);
153 _CRTIMP double __cdecl __MINGW_NOTHROW _nextafter (double, double);
154 _CRTIMP double __cdecl __MINGW_NOTHROW _scalb (double, long);
156 _CRTIMP int __cdecl __MINGW_NOTHROW _finite (double);
157 _CRTIMP int __cdecl __MINGW_NOTHROW _fpclass (double);
158 _CRTIMP int __cdecl __MINGW_NOTHROW _isnan (double);
164 #endif /* Not RC_INVOKED */
166 #endif /* Not __STRICT_ANSI__ */
168 #endif /* _MINGW_FLOAT_H_ */