1/* 2 * float.h 3 * This file has no copyright assigned and is placed in the Public Domain. 4 * This file is part of the mingw-runtime package. 5 * No warranty is given; refer to the file DISCLAIMER.PD 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 */ 13 14#if (defined (__GNUC__) && defined (__GNUC_MINOR__)) \ 15 || (defined(__clang__) && defined(__clang_major__)) 16#if (__GNUC__ < 4 || (__GNUC__ == 4 && __GNUC_MINOR__ < 6)) \ 17 || (__clang_major__ >=3) 18#if !defined(_FLOAT_H___) && !defined(__FLOAT_H) 19#include_next <float.h> 20#endif 21#elif !defined (_FLOAT_H___) 22#if (__GNUC__ < 4) 23#error Corrupt install of gcc-s internal headers, or search order was changed. 24#else 25 /* #include_next <float_ginclude.h> */ 26 27 /* Number of decimal digits, q, such that any floating-point number with q 28 decimal digits can be rounded into a floating-point number with p radix b 29 digits and back again without change to the q decimal digits, 30 31 p * log10(b) if b is a power of 10 32 floor((p - 1) * log10(b)) otherwise 33 */ 34 #undef FLT_DIG 35 #undef DBL_DIG 36 #undef LDBL_DIG 37 #define FLT_DIG __FLT_DIG__ 38 #define DBL_DIG __DBL_DIG__ 39 #define LDBL_DIG __LDBL_DIG__ 40 41 42 /* Maximum representable finite floating-point number, 43 44 (1 - b**-p) * b**emax 45 */ 46 #undef FLT_MAX 47 #undef DBL_MAX 48 #undef LDBL_MAX 49 #define FLT_MAX __FLT_MAX__ 50 #define DBL_MAX __DBL_MAX__ 51 #define LDBL_MAX __LDBL_MAX__ 52 53 54 /* Minimum normalized positive floating-point number, b**(emin - 1). */ 55 #undef FLT_MIN 56 #undef DBL_MIN 57 #undef LDBL_MIN 58 #define FLT_MIN __FLT_MIN__ 59 #define DBL_MIN __DBL_MIN__ 60 #define LDBL_MIN __LDBL_MIN__ 61 62 /* Needed for libjava building - Victor K. */ 63 64 /* Radix of exponent representation, b. */ 65 #undef FLT_RADIX 66 #define FLT_RADIX __FLT_RADIX__ 67 68 /* Minimum int x such that FLT_RADIX**(x-1) is a normalized float, emin */ 69 #undef FLT_MIN_EXP 70 #undef DBL_MIN_EXP 71 #undef LDBL_MIN_EXP 72 #define FLT_MIN_EXP __FLT_MIN_EXP__ 73 #define DBL_MIN_EXP __DBL_MIN_EXP__ 74 #define LDBL_MIN_EXP __LDBL_MIN_EXP__ 75 76 /* Minimum negative integer such that 10 raised to that power is in the 77 range of normalized floating-point numbers, 78 79 ceil(log10(b) * (emin - 1)) 80 */ 81 #undef FLT_MIN_10_EXP 82 #undef DBL_MIN_10_EXP 83 #undef LDBL_MIN_10_EXP 84 #define FLT_MIN_10_EXP __FLT_MIN_10_EXP__ 85 #define DBL_MIN_10_EXP __DBL_MIN_10_EXP__ 86 #define LDBL_MIN_10_EXP __LDBL_MIN_10_EXP__ 87 88 /* Maximum int x such that FLT_RADIX**(x-1) is a representable float, emax. */ 89 #undef FLT_MAX_EXP 90 #undef DBL_MAX_EXP 91 #undef LDBL_MAX_EXP 92 #define FLT_MAX_EXP __FLT_MAX_EXP__ 93 #define DBL_MAX_EXP __DBL_MAX_EXP__ 94 #define LDBL_MAX_EXP __LDBL_MAX_EXP__ 95 96 /* Maximum integer such that 10 raised to that power is in the range of 97 representable finite floating-point numbers, 98 99 floor(log10((1 - b**-p) * b**emax)) 100 */ 101 #undef FLT_MAX_10_EXP 102 #undef DBL_MAX_10_EXP 103 #undef LDBL_MAX_10_EXP 104 #define FLT_MAX_10_EXP __FLT_MAX_10_EXP__ 105 #define DBL_MAX_10_EXP __DBL_MAX_10_EXP__ 106 #define LDBL_MAX_10_EXP __LDBL_MAX_10_EXP__ 107 108 /* Addition rounds to 0: zero, 1: nearest, 2: +inf, 3: -inf, -1: unknown. */ 109 /* ??? This is supposed to change with calls to fesetround in <fenv.h>. */ 110 #undef FLT_ROUNDS 111 #define FLT_ROUNDS 1 112 113 #define _FLOAT_H___ 114#endif 115#endif 116#endif 117 118#ifndef _MINGW_FLOAT_H_ 119#define _MINGW_FLOAT_H_ 120 121/* All the headers include this file. */ 122#include <crtdefs.h> 123 124/* 125 * Functions and definitions for controlling the FPU. 126 */ 127#ifndef __STRICT_ANSI__ 128 129/* TODO: These constants are only valid for x86 machines */ 130 131/* Control word masks for unMask */ 132#define _MCW_DN 0x03000000 /* Denormal control */ 133#define _MCW_EM 0x0008001F /* Error masks */ 134#define _MCW_IC 0x00040000 /* Infinity */ 135#define _MCW_RC 0x00000300 /* Rounding */ 136#define _MCW_PC 0x00030000 /* Precision */ 137 138/* Number of base-FLT_RADIX digits in the significand, p. */ 139#undef FLT_MANT_DIG 140#undef DBL_MANT_DIG 141#undef LDBL_MANT_DIG 142#define FLT_MANT_DIG __FLT_MANT_DIG__ 143#define DBL_MANT_DIG __DBL_MANT_DIG__ 144#define LDBL_MANT_DIG __LDBL_MANT_DIG__ 145 146#if defined (__STDC_VERSION__) && __STDC_VERSION__ >= 199901L 147/* The floating-point expression evaluation method. 148 -1 indeterminate 149 0 evaluate all operations and constants just to the range and 150 precision of the type 151 1 evaluate operations and constants of type float and double 152 to the range and precision of the double type, evaluate 153 long double operations and constants to the range and 154 precision of the long double type 155 2 evaluate all operations and constants to the range and 156 precision of the long double type 157 158 ??? This ought to change with the setting of the fp control word; 159 the value provided by the compiler assumes the widest setting. */ 160#undef FLT_EVAL_METHOD 161#define FLT_EVAL_METHOD __FLT_EVAL_METHOD__ 162 163#endif /* C99 */ 164 165 166/* Control word values for unNew (use with related unMask above) */ 167#define _DN_SAVE 0x00000000 168#define _DN_FLUSH 0x01000000 169#define _EM_INVALID 0x00000010 170#define _EM_DENORMAL 0x00080000 171#define _EM_ZERODIVIDE 0x00000008 172#define _EM_OVERFLOW 0x00000004 173#define _EM_UNDERFLOW 0x00000002 174#define _EM_INEXACT 0x00000001 175#define _IC_AFFINE 0x00040000 176#define _IC_PROJECTIVE 0x00000000 177#define _RC_CHOP 0x00000300 178#define _RC_UP 0x00000200 179#define _RC_DOWN 0x00000100 180#define _RC_NEAR 0x00000000 181#define _PC_24 0x00020000 182#define _PC_53 0x00010000 183#define _PC_64 0x00000000 184 185/* These are also defined in Mingw math.h, needed to work around 186 GCC build issues. */ 187/* Return values for fpclass. */ 188#ifndef __MINGW_FPCLASS_DEFINED 189#define __MINGW_FPCLASS_DEFINED 1 190#define _FPCLASS_SNAN 0x0001 /* Signaling "Not a Number" */ 191#define _FPCLASS_QNAN 0x0002 /* Quiet "Not a Number" */ 192#define _FPCLASS_NINF 0x0004 /* Negative Infinity */ 193#define _FPCLASS_NN 0x0008 /* Negative Normal */ 194#define _FPCLASS_ND 0x0010 /* Negative Denormal */ 195#define _FPCLASS_NZ 0x0020 /* Negative Zero */ 196#define _FPCLASS_PZ 0x0040 /* Positive Zero */ 197#define _FPCLASS_PD 0x0080 /* Positive Denormal */ 198#define _FPCLASS_PN 0x0100 /* Positive Normal */ 199#define _FPCLASS_PINF 0x0200 /* Positive Infinity */ 200#endif /* __MINGW_FPCLASS_DEFINED */ 201 202/* invalid subconditions (_SW_INVALID also set) */ 203#define _SW_UNEMULATED 0x0040 /* unemulated instruction */ 204#define _SW_SQRTNEG 0x0080 /* square root of a neg number */ 205#define _SW_STACKOVERFLOW 0x0200 /* FP stack overflow */ 206#define _SW_STACKUNDERFLOW 0x0400 /* FP stack underflow */ 207 208/* Floating point error signals and return codes */ 209#define _FPE_INVALID 0x81 210#define _FPE_DENORMAL 0x82 211#define _FPE_ZERODIVIDE 0x83 212#define _FPE_OVERFLOW 0x84 213#define _FPE_UNDERFLOW 0x85 214#define _FPE_INEXACT 0x86 215#define _FPE_UNEMULATED 0x87 216#define _FPE_SQRTNEG 0x88 217#define _FPE_STACKOVERFLOW 0x8a 218#define _FPE_STACKUNDERFLOW 0x8b 219#define _FPE_EXPLICITGEN 0x8c /* raise( SIGFPE ); */ 220 221#define CW_DEFAULT _CW_DEFAULT 222#define MCW_PC _MCW_PC 223#define PC_24 _PC_24 224#define PC_53 _PC_53 225#define PC_64 _PC_64 226 227#if defined(_M_IX86) 228#define _CW_DEFAULT (_RC_NEAR+_PC_53+_EM_INVALID+_EM_ZERODIVIDE+_EM_OVERFLOW+_EM_UNDERFLOW+_EM_INEXACT+_EM_DENORMAL) 229#elif defined(_M_IA64) 230#define _CW_DEFAULT (_RC_NEAR+_PC_64+_EM_INVALID+_EM_ZERODIVIDE+_EM_OVERFLOW+_EM_UNDERFLOW+_EM_INEXACT+_EM_DENORMAL) 231#elif defined(_M_AMD64) 232#define _CW_DEFAULT (_RC_NEAR+_EM_INVALID+_EM_ZERODIVIDE+_EM_OVERFLOW+_EM_UNDERFLOW+_EM_INEXACT+_EM_DENORMAL) 233#endif 234 235#ifndef RC_INVOKED 236 237#ifdef __cplusplus 238extern "C" { 239#endif 240 241/* Set the FPU control word as cw = (cw & ~unMask) | (unNew & unMask), 242 * i.e. change the bits in unMask to have the values they have in unNew, 243 * leaving other bits unchanged. */ 244_CRTIMP unsigned int __cdecl __MINGW_NOTHROW _controlfp (unsigned int unNew, unsigned int unMask) __MINGW_ATTRIB_DEPRECATED_SEC_WARN; 245_CRTIMP errno_t __cdecl _controlfp_s(unsigned int *_CurrentState, unsigned int _NewValue, unsigned int _Mask); 246_CRTIMP unsigned int __cdecl __MINGW_NOTHROW _control87 (unsigned int unNew, unsigned int unMask); 247 248 249_CRTIMP unsigned int __cdecl __MINGW_NOTHROW _clearfp (void); /* Clear the FPU status word */ 250_CRTIMP unsigned int __cdecl __MINGW_NOTHROW _statusfp (void); /* Report the FPU status word */ 251#define _clear87 _clearfp 252#define _status87 _statusfp 253 254 255/* 256 MSVCRT.dll _fpreset initializes the control register to 0x27f, 257 the status register to zero and the tag word to 0FFFFh. 258 This differs from asm instruction finit/fninit which set control 259 word to 0x37f (64 bit mantissa precison rather than 53 bit). 260 By default, the mingw version of _fpreset sets fp control as 261 per fninit. To use the MSVCRT.dll _fpreset, include CRT_fp8.o when 262 building your application. 263*/ 264void __cdecl __MINGW_NOTHROW _fpreset (void); 265void __cdecl __MINGW_NOTHROW fpreset (void); 266 267/* Global 'variable' for the current floating point error code. */ 268_CRTIMP int * __cdecl __MINGW_NOTHROW __fpecode(void); 269#define _fpecode (*(__fpecode())) 270 271/* 272 * IEEE recommended functions. MS puts them in float.h 273 * but they really belong in math.h. 274 */ 275 276#ifndef _SIGN_DEFINED 277#define _SIGN_DEFINED 278_CRTIMP double __cdecl __MINGW_NOTHROW _chgsign (double _X); 279_CRTIMP double __cdecl __MINGW_NOTHROW _copysign (double _Number,double _Sign); 280_CRTIMP double __cdecl __MINGW_NOTHROW _logb (double); 281_CRTIMP double __cdecl __MINGW_NOTHROW _nextafter (double, double); 282_CRTIMP double __cdecl __MINGW_NOTHROW _scalb (double, long); 283 284_CRTIMP int __cdecl __MINGW_NOTHROW _finite (double); 285_CRTIMP int __cdecl __MINGW_NOTHROW _fpclass (double); 286_CRTIMP int __cdecl __MINGW_NOTHROW _isnan (double); 287 288#define _copysignl copysignl 289extern long double __cdecl _chgsignl (long double); 290#endif /* _SIGN_DEFINED */ 291 292#ifdef __cplusplus 293} 294#endif 295 296#endif /* Not RC_INVOKED */ 297 298#endif /* Not __STRICT_ANSI__ */ 299 300#endif /* _MINGW_FLOAT_H_ */ 301 302