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#ifndef _MINGW_FLOAT_H_ |
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/* |
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* float.h |
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* |
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* This file has no copyright assigned and is placed in the Public Domain. |
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* This file is a part of the mingw-runtime package. |
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* No warranty is given; refer to the file DISCLAIMER within the package. |
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* |
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* Constants related to floating point arithmetic. |
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* |
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* Also included here are some non-ANSI bits for accessing the floating |
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* point controller. |
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* |
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*/ |
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#define _MINGW_FLOAT_H_ |
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/* |
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* NOTE: |
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* |
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* GCC provides float.h, but it doesn't include the non-standard stuff for |
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* accessing the fp controller. We parse the GCC-supplied header, for its |
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* standard content, and then define the MS-specific extensions here. |
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* |
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* In a MinGW standard Win32 hosted environment, this should be the float.h |
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* found by a system include path search, but this can't be guaranteed; for |
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* a cross-compiler setup, the GCC-supplied header, which is guarded by the |
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* _FLOAT_H___ macro, may be found first, thus... |
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* |
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*/ |
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#if !defined(_FLOAT_H___) && !defined(__FLOAT_H) |
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|
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/* |
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* ...when we didn't find the GCC-supplied header first, we want to pull |
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* it in now; include_next should achieve this, (and we must rely on the |
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* GCC header maintainers to extend us the same courtesy, to get this one |
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* pulled in, when the GCC-supplied header is found first). |
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* |
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*/ |
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# include_next <float.h> |
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#endif |
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|
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/* All the headers include this file. */ |
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#include <_mingw.h> |
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|
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/* |
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* Functions and definitions for controlling the FPU. |
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*/ |
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#ifndef __STRICT_ANSI__ |
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|
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/* TODO: These constants are only valid for x86 machines */ |
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|
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/* Control word masks for unMask */ |
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#define _MCW_EM 0x0008001F /* Error masks */ |
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#define _MCW_IC 0x00040000 /* Infinity */ |
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#define _MCW_RC 0x00000300 /* Rounding */ |
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#define _MCW_PC 0x00030000 /* Precision */ |
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|
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/* Control word values for unNew (use with related unMask above) */ |
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#define _EM_INVALID 0x00000010 |
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#define _EM_DENORMAL 0x00080000 |
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#define _EM_ZERODIVIDE 0x00000008 |
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#define _EM_OVERFLOW 0x00000004 |
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#define _EM_UNDERFLOW 0x00000002 |
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#define _EM_INEXACT 0x00000001 |
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#define _IC_AFFINE 0x00040000 |
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#define _IC_PROJECTIVE 0x00000000 |
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#define _RC_CHOP 0x00000300 |
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#define _RC_UP 0x00000200 |
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#define _RC_DOWN 0x00000100 |
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#define _RC_NEAR 0x00000000 |
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#define _PC_24 0x00020000 |
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#define _PC_53 0x00010000 |
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#define _PC_64 0x00000000 |
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|
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/* These are also defined in Mingw math.h, needed to work around |
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GCC build issues. */ |
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/* Return values for fpclass. */ |
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#ifndef __MINGW_FPCLASS_DEFINED |
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#define __MINGW_FPCLASS_DEFINED 1 |
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#define _FPCLASS_SNAN 0x0001 /* Signaling "Not a Number" */ |
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#define _FPCLASS_QNAN 0x0002 /* Quiet "Not a Number" */ |
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#define _FPCLASS_NINF 0x0004 /* Negative Infinity */ |
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#define _FPCLASS_NN 0x0008 /* Negative Normal */ |
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#define _FPCLASS_ND 0x0010 /* Negative Denormal */ |
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#define _FPCLASS_NZ 0x0020 /* Negative Zero */ |
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#define _FPCLASS_PZ 0x0040 /* Positive Zero */ |
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#define _FPCLASS_PD 0x0080 /* Positive Denormal */ |
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#define _FPCLASS_PN 0x0100 /* Positive Normal */ |
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#define _FPCLASS_PINF 0x0200 /* Positive Infinity */ |
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#endif /* __MINGW_FPCLASS_DEFINED */ |
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|
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/* invalid subconditions (_SW_INVALID also set) */ |
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#define _SW_UNEMULATED 0x0040 /* unemulated instruction */ |
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#define _SW_SQRTNEG 0x0080 /* square root of a neg number */ |
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#define _SW_STACKOVERFLOW 0x0200 /* FP stack overflow */ |
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#define _SW_STACKUNDERFLOW 0x0400 /* FP stack underflow */ |
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|
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/* Floating point error signals and return codes */ |
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#define _FPE_INVALID 0x81 |
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#define _FPE_DENORMAL 0x82 |
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#define _FPE_ZERODIVIDE 0x83 |
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#define _FPE_OVERFLOW 0x84 |
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#define _FPE_UNDERFLOW 0x85 |
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#define _FPE_INEXACT 0x86 |
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#define _FPE_UNEMULATED 0x87 |
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#define _FPE_SQRTNEG 0x88 |
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#define _FPE_STACKOVERFLOW 0x8a |
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#define _FPE_STACKUNDERFLOW 0x8b |
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#define _FPE_EXPLICITGEN 0x8c /* raise( SIGFPE ); */ |
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|
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#ifndef RC_INVOKED |
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|
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#ifdef __cplusplus |
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extern "C" { |
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#endif |
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|
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/* Set the FPU control word as cw = (cw & ~unMask) | (unNew & unMask), |
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* i.e. change the bits in unMask to have the values they have in unNew, |
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* leaving other bits unchanged. */ |
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_CRTIMP unsigned int __cdecl __MINGW_NOTHROW _controlfp (unsigned int unNew, unsigned int unMask); |
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_CRTIMP unsigned int __cdecl __MINGW_NOTHROW _control87 (unsigned int unNew, unsigned int unMask); |
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|
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|
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_CRTIMP unsigned int __cdecl __MINGW_NOTHROW _clearfp (void); /* Clear the FPU status word */ |
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_CRTIMP unsigned int __cdecl __MINGW_NOTHROW _statusfp (void); /* Report the FPU status word */ |
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#define _clear87 _clearfp |
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#define _status87 _statusfp |
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|
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|
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/* |
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MSVCRT.dll _fpreset initializes the control register to 0x27f, |
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the status register to zero and the tag word to 0FFFFh. |
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This differs from asm instruction finit/fninit which set control |
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word to 0x37f (64 bit mantissa precison rather than 53 bit). |
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By default, the mingw version of _fpreset sets fp control as |
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per fninit. To use the MSVCRT.dll _fpreset, include CRT_fp8.o when |
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building your application. |
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*/ |
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void __cdecl __MINGW_NOTHROW _fpreset (void); |
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void __cdecl __MINGW_NOTHROW fpreset (void); |
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|
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/* Global 'variable' for the current floating point error code. */ |
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_CRTIMP int * __cdecl __MINGW_NOTHROW __fpecode(void); |
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#define _fpecode (*(__fpecode())) |
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|
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/* |
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* IEEE recommended functions. MS puts them in float.h |
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* but they really belong in math.h. |
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*/ |
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|
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_CRTIMP double __cdecl __MINGW_NOTHROW _chgsign (double); |
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_CRTIMP double __cdecl __MINGW_NOTHROW _copysign (double, double); |
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_CRTIMP double __cdecl __MINGW_NOTHROW _logb (double); |
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_CRTIMP double __cdecl __MINGW_NOTHROW _nextafter (double, double); |
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_CRTIMP double __cdecl __MINGW_NOTHROW _scalb (double, long); |
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|
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_CRTIMP int __cdecl __MINGW_NOTHROW _finite (double); |
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_CRTIMP int __cdecl __MINGW_NOTHROW _fpclass (double); |
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_CRTIMP int __cdecl __MINGW_NOTHROW _isnan (double); |
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|
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#ifdef __cplusplus |
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} |
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#endif |
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|
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#endif /* Not RC_INVOKED */ |
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|
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#endif /* Not __STRICT_ANSI__ */ |
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|
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#endif /* _MINGW_FLOAT_H_ */ |
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|
