source: Daodan/MinGW/include/float.h@ 1132

Last change on this file since 1132 was 1046, checked in by alloc, 8 years ago

Daodan: Added Windows MinGW and build batch file
File size: 5.6 KB
Line 
1#ifndef _MINGW_FLOAT_H_
2/*
3 * float.h
4 *
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.
8 *
9 * Constants related to floating point arithmetic.
10 *
11 * Also included here are some non-ANSI bits for accessing the floating
12 * point controller.
13 *
14 */
15#define _MINGW_FLOAT_H_
16/*
17 * NOTE:
18 *
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.
22 *
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...
27 *
28 */
29#if !defined(_FLOAT_H___) && !defined(__FLOAT_H)
30
31 /*
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).
36 *
37 */
38# include_next <float.h>
39#endif
40
41/* All the headers include this file. */
42#include <_mingw.h>
43
44/*
45 * Functions and definitions for controlling the FPU.
46 */
47#ifndef __STRICT_ANSI__
48
49/* TODO: These constants are only valid for x86 machines */
50
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 */
56
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
73
74/* These are also defined in Mingw math.h, needed to work around
75 GCC build issues. */
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 */
90
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 */
96
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 ); */
109
110#ifndef RC_INVOKED
111
112#ifdef __cplusplus
113extern "C" {
114#endif
115
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);
121
122
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
127
128
129/*
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.
137*/
138void __cdecl __MINGW_NOTHROW _fpreset (void);
139void __cdecl __MINGW_NOTHROW fpreset (void);
140
141/* Global 'variable' for the current floating point error code. */
142_CRTIMP int * __cdecl __MINGW_NOTHROW __fpecode(void);
143#define _fpecode (*(__fpecode()))
144
145/*
146 * IEEE recommended functions. MS puts them in float.h
147 * but they really belong in math.h.
148 */
149
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);
155
156_CRTIMP int __cdecl __MINGW_NOTHROW _finite (double);
157_CRTIMP int __cdecl __MINGW_NOTHROW _fpclass (double);
158_CRTIMP int __cdecl __MINGW_NOTHROW _isnan (double);
159
160#ifdef __cplusplus
161}
162#endif
163
164#endif /* Not RC_INVOKED */
165
166#endif /* Not __STRICT_ANSI__ */
167
168#endif /* _MINGW_FLOAT_H_ */
169
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