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 <corecrt.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 #define _DN_SAVE 0x00000000 63 #define _DN_FLUSH 0x01000000 64 #define _DN_FLUSH_OPERANDS_SAVE_RESULTS 0x02000000 65 #define _DN_SAVE_OPERANDS_FLUSH_RESULTS 0x03000000 66 67 /* These are also defined in Mingw math.h, needed to work around 68 GCC build issues. */ 69 /* Return values for fpclass. */ 70 #ifndef __MINGW_FPCLASS_DEFINED 71 #define __MINGW_FPCLASS_DEFINED 1 72 #define _FPCLASS_SNAN 0x0001 /* Signaling "Not a Number" */ 73 #define _FPCLASS_QNAN 0x0002 /* Quiet "Not a Number" */ 74 #define _FPCLASS_NINF 0x0004 /* Negative Infinity */ 75 #define _FPCLASS_NN 0x0008 /* Negative Normal */ 76 #define _FPCLASS_ND 0x0010 /* Negative Denormal */ 77 #define _FPCLASS_NZ 0x0020 /* Negative Zero */ 78 #define _FPCLASS_PZ 0x0040 /* Positive Zero */ 79 #define _FPCLASS_PD 0x0080 /* Positive Denormal */ 80 #define _FPCLASS_PN 0x0100 /* Positive Normal */ 81 #define _FPCLASS_PINF 0x0200 /* Positive Infinity */ 82 #endif /* __MINGW_FPCLASS_DEFINED */ 83 84 /* _statusfp bit flags */ 85 #define _SW_INEXACT 0x00000001 /* inexact (precision) */ 86 #define _SW_UNDERFLOW 0x00000002 /* underflow */ 87 #define _SW_OVERFLOW 0x00000004 /* overflow */ 88 #define _SW_ZERODIVIDE 0x00000008 /* zero divide */ 89 #define _SW_INVALID 0x00000010 /* invalid */ 90 #define _SW_DENORMAL 0x00080000 /* denormal status bit */ 91 92 /* invalid subconditions (_SW_INVALID also set) */ 93 #define _SW_UNEMULATED 0x0040 /* unemulated instruction */ 94 #define _SW_SQRTNEG 0x0080 /* square root of a neg number */ 95 #define _SW_STACKOVERFLOW 0x0200 /* FP stack overflow */ 96 #define _SW_STACKUNDERFLOW 0x0400 /* FP stack underflow */ 97 98 /* Floating point error signals and return codes */ 99 #define _FPE_INVALID 0x81 100 #define _FPE_DENORMAL 0x82 101 #define _FPE_ZERODIVIDE 0x83 102 #define _FPE_OVERFLOW 0x84 103 #define _FPE_UNDERFLOW 0x85 104 #define _FPE_INEXACT 0x86 105 #define _FPE_UNEMULATED 0x87 106 #define _FPE_SQRTNEG 0x88 107 #define _FPE_STACKOVERFLOW 0x8a 108 #define _FPE_STACKUNDERFLOW 0x8b 109 #define _FPE_EXPLICITGEN 0x8c /* raise( SIGFPE ); */ 110 111 #ifndef RC_INVOKED 112 113 #ifdef __cplusplus 114 extern "C" { 115 #endif 116 117 /* Set the FPU control word as cw = (cw & ~unMask) | (unNew & unMask), 118 * i.e. change the bits in unMask to have the values they have in unNew, 119 * leaving other bits unchanged. */ 120 121 __MINGW_NOTHROW 122 _CRTIMP 123 unsigned int 124 __cdecl 125 _controlfp( 126 _In_ unsigned int unNew, 127 _In_ unsigned int unMask); 128 129 __MINGW_NOTHROW 130 _CRTIMP 131 unsigned int 132 __cdecl 133 _control87( 134 _In_ unsigned int unNew, 135 _In_ unsigned int unMask); 136 137 __MINGW_NOTHROW _CRTIMP unsigned int __cdecl _clearfp (void); /* Clear the FPU status word */ 138 __MINGW_NOTHROW _CRTIMP unsigned int __cdecl _statusfp (void); /* Report the FPU status word */ 139 #define _clear87 _clearfp 140 #define _status87 _statusfp 141 142 143 /* 144 MSVCRT.dll _fpreset initializes the control register to 0x27f, 145 the status register to zero and the tag word to 0FFFFh. 146 This differs from asm instruction finit/fninit which set control 147 word to 0x37f (64 bit mantissa precison rather than 53 bit). 148 By default, the mingw version of _fpreset sets fp control as 149 per fninit. To use the MSVCRT.dll _fpreset, include CRT_fp8.o when 150 building your application. 151 */ 152 __MINGW_NOTHROW void __cdecl _fpreset (void); 153 __MINGW_NOTHROW void __cdecl fpreset (void); 154 155 /* Global 'variable' for the current floating point error code. */ 156 __MINGW_NOTHROW _CRTIMP int * __cdecl __fpecode(void); 157 #define _fpecode (*(__fpecode())) 158 159 /* 160 * IEEE recommended functions. MS puts them in float.h 161 * but they really belong in math.h. 162 */ 163 164 _Check_return_ 165 __MINGW_NOTHROW 166 _CRTIMP 167 double 168 __cdecl 169 _chgsign( 170 _In_ double); 171 172 _Check_return_ 173 __MINGW_NOTHROW 174 _CRTIMP 175 double 176 __cdecl 177 _copysign( 178 _In_ double, 179 _In_ double); 180 181 _Check_return_ 182 __MINGW_NOTHROW 183 _CRTIMP 184 double 185 __cdecl 186 _logb( 187 _In_ double); 188 189 _Check_return_ 190 __MINGW_NOTHROW 191 _CRTIMP 192 double 193 __cdecl 194 _nextafter( 195 _In_ double, 196 _In_ double); 197 198 _Check_return_ 199 __MINGW_NOTHROW 200 _CRTIMP 201 double 202 __cdecl 203 _scalb( 204 _In_ double, 205 _In_ long); 206 207 _Check_return_ 208 __MINGW_NOTHROW 209 _CRTIMP 210 int 211 __cdecl 212 _finite( 213 _In_ double); 214 215 _Check_return_ 216 __MINGW_NOTHROW 217 _CRTIMP 218 int 219 __cdecl 220 _fpclass( 221 _In_ double); 222 223 _Check_return_ 224 __MINGW_NOTHROW 225 _CRTIMP 226 int 227 __cdecl 228 _isnan( 229 _In_ double); 230 231 #ifdef __cplusplus 232 } 233 #endif 234 235 #endif /* Not RC_INVOKED */ 236 237 #endif /* Not __STRICT_ANSI__ */ 238 239 #endif /* _MINGW_FLOAT_H_ */ 240