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