reactos/include/crt/float.h

   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 #include_next<float.h>
  20
  21 #ifndef _MINGW_FLOAT_H_
  22 #define _MINGW_FLOAT_H_
  23
  24 /* All the headers include this file. */
  25 #include <_mingw.h>
  26
  27 /*
  28  * Functions and definitions for controlling the FPU.
  29  */
  30 #ifndef __STRICT_ANSI__
  31
  32 /* TODO: These constants are only valid for x86 machines */
  33
  34 /* Control word masks for unMask */
  35 #define _MCW_EM         0x0008001F      /* Error masks */
  36 #define _MCW_IC         0x00040000      /* Infinity */
  37 #define _MCW_RC         0x00000300      /* Rounding */
  38 #define _MCW_PC         0x00030000      /* Precision */
  39
  40 /* Control word values for unNew (use with related unMask above) */
  41 #define _EM_INVALID     0x00000010
  42 #define _EM_DENORMAL    0x00080000
  43 #define _EM_ZERODIVIDE  0x00000008
  44 #define _EM_OVERFLOW    0x00000004
  45 #define _EM_UNDERFLOW   0x00000002
  46 #define _EM_INEXACT     0x00000001
  47 #define _IC_AFFINE      0x00040000
  48 #define _IC_PROJECTIVE  0x00000000
  49 #define _RC_CHOP        0x00000300
  50 #define _RC_UP          0x00000200
  51 #define _RC_DOWN        0x00000100
  52 #define _RC_NEAR        0x00000000
  53 #define _PC_24          0x00020000
  54 #define _PC_53          0x00010000
  55 #define _PC_64          0x00000000
  56
  57 /* These are also defined in Mingw math.h, needed to work around
  58    GCC build issues.  */
  59 /* Return values for fpclass. */
  60 #ifndef __MINGW_FPCLASS_DEFINED
  61 #define __MINGW_FPCLASS_DEFINED 1
  62 #define _FPCLASS_SNAN   0x0001  /* Signaling "Not a Number" */
  63 #define _FPCLASS_QNAN   0x0002  /* Quiet "Not a Number" */
  64 #define _FPCLASS_NINF   0x0004  /* Negative Infinity */
  65 #define _FPCLASS_NN     0x0008  /* Negative Normal */
  66 #define _FPCLASS_ND     0x0010  /* Negative Denormal */
  67 #define _FPCLASS_NZ     0x0020  /* Negative Zero */
  68 #define _FPCLASS_PZ     0x0040  /* Positive Zero */
  69 #define _FPCLASS_PD     0x0080  /* Positive Denormal */
  70 #define _FPCLASS_PN     0x0100  /* Positive Normal */
  71 #define _FPCLASS_PINF   0x0200  /* Positive Infinity */
  72 #endif /* __MINGW_FPCLASS_DEFINED */
  73
  74 /* invalid subconditions (_SW_INVALID also set) */
  75 #define _SW_UNEMULATED          0x0040  /* unemulated instruction */
  76 #define _SW_SQRTNEG             0x0080  /* square root of a neg number */
  77 #define _SW_STACKOVERFLOW       0x0200  /* FP stack overflow */
  78 #define _SW_STACKUNDERFLOW      0x0400  /* FP stack underflow */
  79
  80 /*  Floating point error signals and return codes */
  81 #define _FPE_INVALID            0x81
  82 #define _FPE_DENORMAL           0x82
  83 #define _FPE_ZERODIVIDE         0x83
  84 #define _FPE_OVERFLOW           0x84
  85 #define _FPE_UNDERFLOW          0x85
  86 #define _FPE_INEXACT            0x86
  87 #define _FPE_UNEMULATED         0x87
  88 #define _FPE_SQRTNEG            0x88
  89 #define _FPE_STACKOVERFLOW      0x8a
  90 #define _FPE_STACKUNDERFLOW     0x8b
  91 #define _FPE_EXPLICITGEN        0x8c    /* raise( SIGFPE ); */
  92
  93 #ifndef RC_INVOKED
  94
  95 #ifdef  __cplusplus
  96 extern "C" {
  97 #endif
  98
  99 /* Set the FPU control word as cw = (cw & ~unMask) | (unNew & unMask),
 100  * i.e. change the bits in unMask to have the values they have in unNew,
 101  * leaving other bits unchanged. */
 102 _CRTIMP unsigned int __cdecl __MINGW_NOTHROW _controlfp (unsigned int unNew, unsigned int unMask);
 103 _CRTIMP unsigned int __cdecl __MINGW_NOTHROW _control87 (unsigned int unNew, unsigned int unMask);
 104
 105
 106 _CRTIMP unsigned int __cdecl __MINGW_NOTHROW _clearfp (void);   /* Clear the FPU status word */
 107 _CRTIMP unsigned int __cdecl __MINGW_NOTHROW _statusfp (void);  /* Report the FPU status word */
 108 #define         _clear87        _clearfp
 109 #define         _status87       _statusfp
 110
 111
 112 /*
 113    MSVCRT.dll _fpreset initializes the control register to 0x27f,
 114    the status register to zero and the tag word to 0FFFFh.
 115    This differs from asm instruction finit/fninit which set control
 116    word to 0x37f (64 bit mantissa precison rather than 53 bit).
 117    By default, the mingw version of _fpreset sets fp control as
 118    per fninit. To use the MSVCRT.dll _fpreset, include CRT_fp8.o when
 119    building your application.
 120 */
 121 void __cdecl __MINGW_NOTHROW _fpreset (void);
 122 void __cdecl __MINGW_NOTHROW fpreset (void);
 123
 124 /* Global 'variable' for the current floating point error code. */
 125 _CRTIMP int * __cdecl __MINGW_NOTHROW __fpecode(void);
 126 #define _fpecode        (*(__fpecode()))
 127
 128 /*
 129  * IEEE recommended functions.  MS puts them in float.h
 130  * but they really belong in math.h.
 131  */
 132
 133 _CRTIMP double __cdecl __MINGW_NOTHROW _chgsign (double);
 134 _CRTIMP double __cdecl __MINGW_NOTHROW _copysign (double, double);
 135 _CRTIMP double __cdecl __MINGW_NOTHROW _logb (double);
 136 _CRTIMP double __cdecl __MINGW_NOTHROW _nextafter (double, double);
 137 _CRTIMP double __cdecl __MINGW_NOTHROW _scalb (double, long);
 138
 139 _CRTIMP int __cdecl __MINGW_NOTHROW _finite (double);
 140 _CRTIMP int __cdecl __MINGW_NOTHROW _fpclass (double);
 141 _CRTIMP int __cdecl __MINGW_NOTHROW _isnan (double);
 142
 143 #ifdef  __cplusplus
 144 }
 145 #endif
 146
 147 #endif  /* Not RC_INVOKED */
 148
 149 #endif  /* Not __STRICT_ANSI__ */
 150
 151 #endif /* _MINGW_FLOAT_H_ */