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 #ifndef _MINGW_FLOAT_H_ 20 #define _MINGW_FLOAT_H_ 21 22 #if defined(__GNUC__) 23 #include "mingw32/gcc_float.h" 24 #elif defined(_MSC_VER) 25 #include "msc/msc_float.h" 26 #else 27 #error 28 #endif 29 30 #include <crtdefs.h> 31 32 /* 33 * Functions and definitions for controlling the FPU. 34 */ 35 #ifndef __STRICT_ANSI__ 36 37 /* TODO: These constants are only valid for x86 machines */ 38 39 /* Control word masks for unMask */ 40 #define _MCW_EM 0x0008001F /* Error masks */ 41 #define _MCW_IC 0x00040000 /* Infinity */ 42 #define _MCW_RC 0x00000300 /* Rounding */ 43 #define _MCW_PC 0x00030000 /* Precision */ 44 #define _MCW_DN 0x03000000 /* Denormal */ 45 46 /* Control word values for unNew (use with related unMask above) */ 47 #define _EM_INVALID 0x00000010 48 #define _EM_DENORMAL 0x00080000 49 #define _EM_ZERODIVIDE 0x00000008 50 #define _EM_OVERFLOW 0x00000004 51 #define _EM_UNDERFLOW 0x00000002 52 #define _EM_INEXACT 0x00000001 53 #define _IC_AFFINE 0x00040000 54 #define _IC_PROJECTIVE 0x00000000 55 #define _RC_CHOP 0x00000300 56 #define _RC_UP 0x00000200 57 #define _RC_DOWN 0x00000100 58 #define _RC_NEAR 0x00000000 59 #define _PC_24 0x00020000 60 #define _PC_53 0x00010000 61 #define _PC_64 0x00000000 62 63 /* These are also defined in Mingw math.h, needed to work around 64 GCC build issues. */ 65 /* Return values for fpclass. */ 66 #ifndef __MINGW_FPCLASS_DEFINED 67 #define __MINGW_FPCLASS_DEFINED 1 68 #define _FPCLASS_SNAN 0x0001 /* Signaling "Not a Number" */ 69 #define _FPCLASS_QNAN 0x0002 /* Quiet "Not a Number" */ 70 #define _FPCLASS_NINF 0x0004 /* Negative Infinity */ 71 #define _FPCLASS_NN 0x0008 /* Negative Normal */ 72 #define _FPCLASS_ND 0x0010 /* Negative Denormal */ 73 #define _FPCLASS_NZ 0x0020 /* Negative Zero */ 74 #define _FPCLASS_PZ 0x0040 /* Positive Zero */ 75 #define _FPCLASS_PD 0x0080 /* Positive Denormal */ 76 #define _FPCLASS_PN 0x0100 /* Positive Normal */ 77 #define _FPCLASS_PINF 0x0200 /* Positive Infinity */ 78 #endif /* __MINGW_FPCLASS_DEFINED */ 79 80 /* invalid subconditions (_SW_INVALID also set) */ 81 #define _SW_UNEMULATED 0x0040 /* unemulated instruction */ 82 #define _SW_SQRTNEG 0x0080 /* square root of a neg number */ 83 #define _SW_STACKOVERFLOW 0x0200 /* FP stack overflow */ 84 #define _SW_STACKUNDERFLOW 0x0400 /* FP stack underflow */ 85 86 /* Floating point error signals and return codes */ 87 #define _FPE_INVALID 0x81 88 #define _FPE_DENORMAL 0x82 89 #define _FPE_ZERODIVIDE 0x83 90 #define _FPE_OVERFLOW 0x84 91 #define _FPE_UNDERFLOW 0x85 92 #define _FPE_INEXACT 0x86 93 #define _FPE_UNEMULATED 0x87 94 #define _FPE_SQRTNEG 0x88 95 #define _FPE_STACKOVERFLOW 0x8a 96 #define _FPE_STACKUNDERFLOW 0x8b 97 #define _FPE_EXPLICITGEN 0x8c /* raise( SIGFPE ); */ 98 99 #ifndef RC_INVOKED 100 101 #ifdef __cplusplus 102 extern "C" { 103 #endif 104 105 /* Set the FPU control word as cw = (cw & ~unMask) | (unNew & unMask), 106 * i.e. change the bits in unMask to have the values they have in unNew, 107 * leaving other bits unchanged. */ 108 109 __MINGW_NOTHROW 110 _CRTIMP 111 unsigned int 112 __cdecl 113 _controlfp( 114 _In_ unsigned int unNew, 115 _In_ unsigned int unMask); 116 117 __MINGW_NOTHROW 118 _CRTIMP 119 unsigned int 120 __cdecl 121 _control87( 122 _In_ unsigned int unNew, 123 _In_ unsigned int unMask); 124 125 __MINGW_NOTHROW _CRTIMP unsigned int __cdecl _clearfp (void); /* Clear the FPU status word */ 126 __MINGW_NOTHROW _CRTIMP unsigned int __cdecl _statusfp (void); /* Report the FPU status word */ 127 #define _clear87 _clearfp 128 #define _status87 _statusfp 129 130 131 /* 132 MSVCRT.dll _fpreset initializes the control register to 0x27f, 133 the status register to zero and the tag word to 0FFFFh. 134 This differs from asm instruction finit/fninit which set control 135 word to 0x37f (64 bit mantissa precison rather than 53 bit). 136 By default, the mingw version of _fpreset sets fp control as 137 per fninit. To use the MSVCRT.dll _fpreset, include CRT_fp8.o when 138 building your application. 139 */ 140 __MINGW_NOTHROW void __cdecl _fpreset (void); 141 __MINGW_NOTHROW void __cdecl fpreset (void); 142 143 /* Global 'variable' for the current floating point error code. */ 144 __MINGW_NOTHROW _CRTIMP int * __cdecl __fpecode(void); 145 #define _fpecode (*(__fpecode())) 146 147 /* 148 * IEEE recommended functions. MS puts them in float.h 149 * but they really belong in math.h. 150 */ 151 152 _Check_return_ 153 __MINGW_NOTHROW 154 _CRTIMP 155 double 156 __cdecl 157 _chgsign( 158 _In_ double); 159 160 _Check_return_ 161 __MINGW_NOTHROW 162 _CRTIMP 163 double 164 __cdecl 165 _copysign( 166 _In_ double, 167 _In_ double); 168 169 _Check_return_ 170 __MINGW_NOTHROW 171 _CRTIMP 172 double 173 __cdecl 174 _logb( 175 _In_ double); 176 177 _Check_return_ 178 __MINGW_NOTHROW 179 _CRTIMP 180 double 181 __cdecl 182 _nextafter( 183 _In_ double, 184 _In_ double); 185 186 _Check_return_ 187 __MINGW_NOTHROW 188 _CRTIMP 189 double 190 __cdecl 191 _scalb( 192 _In_ double, 193 _In_ long); 194 195 _Check_return_ 196 __MINGW_NOTHROW 197 _CRTIMP 198 int 199 __cdecl 200 _finite( 201 _In_ double); 202 203 _Check_return_ 204 __MINGW_NOTHROW 205 _CRTIMP 206 int 207 __cdecl 208 _fpclass( 209 _In_ double); 210 211 _Check_return_ 212 __MINGW_NOTHROW 213 _CRTIMP 214 int 215 __cdecl 216 _isnan( 217 _In_ double); 218 219 #ifdef __cplusplus 220 } 221 #endif 222 223 #endif /* Not RC_INVOKED */ 224 225 #endif /* Not __STRICT_ANSI__ */ 226 227 #endif /* _MINGW_FLOAT_H_ */ 228