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- /*
- * float.h
- *
- * Constants related to floating point arithmetic. Also included here are
- * some non-ANSI mechanisms for accessing the floating point controller.
- *
- * $Id: float.h,v af569eb5aad7 2017/02/27 17:46:27 keithmarshall $
- *
- * Written by Colin Peters <colin@bird.fu.is.saga-u.ac.jp>
- * Copyright (C) 1997, 1999-2005, 2007, 2010, 2011, 2017, MinGW.org Project
- *
- *
- * Permission is hereby granted, free of charge, to any person obtaining a
- * copy of this software and associated documentation files (the "Software"),
- * to deal in the Software without restriction, including without limitation
- * the rights to use, copy, modify, merge, publish, distribute, sublicense,
- * and/or sell copies of the Software, and to permit persons to whom the
- * Software is furnished to do so, subject to the following conditions:
- *
- * The above copyright notice, this permission notice, and the following
- * disclaimer shall be included in all copies or substantial portions of
- * the Software.
- *
- * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
- * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
- * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
- * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
- * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
- * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OF OR OTHER
- * DEALINGS IN THE SOFTWARE.
- *
- */
- #ifndef _MINGW_FLOAT_H
- #pragma GCC system_header
- #define _MINGW_FLOAT_H
- /*
- * NOTE:
- *
- * GCC provides float.h, but it doesn't include the non-standard stuff for
- * accessing the fp controller. We parse the GCC-supplied header, for its
- * standard content, and then define the MS-specific extensions here.
- *
- * In a MinGW standard Win32 hosted environment, this should be the float.h
- * found by a system include path search, but this can't be guaranteed; for
- * a cross-compiler setup, the GCC-supplied header, which is guarded by the
- * _FLOAT_H___ macro, may be found first, thus, except when compiling any
- * __LIBIMPL__ stub...
- *
- */
- #if !defined(_FLOAT_H___) && !defined(__FLOAT_H)
- /* ...when we didn't find the GCC-supplied header first, we want to pull
- * it in now; include_next should achieve this, (and we must rely on the
- * GCC header maintainers to extend us the same courtesy, to get this one
- * pulled in, when the GCC-supplied header is found first).
- */
- # define _MINGW_FLOAT_H_ 1 /* GCC's <float.h> needs to see this */
- # include_next <float.h> /* !__CRT_ALIAS __LIBIMPL__( FUNCTION = fpreset ) */
- #endif
- /* All MinGW headers are required to include <_mingw.h>
- */
- #include <_mingw.h>
- /* Functions and definitions for controlling the FPU.
- */
- #ifndef __STRICT_ANSI__
- /* TODO: These constants are only valid for x86 machines */
- /* Control word masks for unMask
- */
- #define _MCW_EM 0x0008001F /* Error masks */
- #define _MCW_IC 0x00040000 /* Infinity */
- #define _MCW_RC 0x00000300 /* Rounding */
- #define _MCW_PC 0x00030000 /* Precision */
- /* Control word values for unNew (use with related unMask above)
- */
- #define _EM_INVALID 0x00000010
- #define _EM_DENORMAL 0x00080000
- #define _EM_ZERODIVIDE 0x00000008
- #define _EM_OVERFLOW 0x00000004
- #define _EM_UNDERFLOW 0x00000002
- #define _EM_INEXACT 0x00000001
- #define _IC_AFFINE 0x00040000
- #define _IC_PROJECTIVE 0x00000000
- #define _RC_CHOP 0x00000300
- #define _RC_UP 0x00000200
- #define _RC_DOWN 0x00000100
- #define _RC_NEAR 0x00000000
- #define _PC_24 0x00020000
- #define _PC_53 0x00010000
- #define _PC_64 0x00000000
- #ifndef __MINGW_FPCLASS_DEFINED
- #define __MINGW_FPCLASS_DEFINED 1
- /* These are also defined in MinGW <math.h>; these duplicates are
- * needed here, to work around GCC build issues. FIXME: we should
- * be able to factor this, at least to avoid any potential for the
- * introduction of inconsistent definitions.
- *
- *
- * Return values for fpclass.
- */
- #define _FPCLASS_SNAN 0x0001 /* Signaling "Not a Number" */
- #define _FPCLASS_QNAN 0x0002 /* Quiet "Not a Number" */
- #define _FPCLASS_NINF 0x0004 /* Negative Infinity */
- #define _FPCLASS_NN 0x0008 /* Negative Normal */
- #define _FPCLASS_ND 0x0010 /* Negative Denormal */
- #define _FPCLASS_NZ 0x0020 /* Negative Zero */
- #define _FPCLASS_PZ 0x0040 /* Positive Zero */
- #define _FPCLASS_PD 0x0080 /* Positive Denormal */
- #define _FPCLASS_PN 0x0100 /* Positive Normal */
- #define _FPCLASS_PINF 0x0200 /* Positive Infinity */
- #endif /* __MINGW_FPCLASS_DEFINED */
- /* Invalid subconditions (_SW_INVALID also set)
- */
- #define _SW_UNEMULATED 0x0040 /* unemulated instruction */
- #define _SW_SQRTNEG 0x0080 /* square root of a neg number */
- #define _SW_STACKOVERFLOW 0x0200 /* FP stack overflow */
- #define _SW_STACKUNDERFLOW 0x0400 /* FP stack underflow */
- /* Floating point error signals and return codes
- */
- #define _FPE_INVALID 0x81
- #define _FPE_DENORMAL 0x82
- #define _FPE_ZERODIVIDE 0x83
- #define _FPE_OVERFLOW 0x84
- #define _FPE_UNDERFLOW 0x85
- #define _FPE_INEXACT 0x86
- #define _FPE_UNEMULATED 0x87
- #define _FPE_SQRTNEG 0x88
- #define _FPE_STACKOVERFLOW 0x8A
- #define _FPE_STACKUNDERFLOW 0x8B
- #define _FPE_EXPLICITGEN 0x8C /* raise SIGFPE */
- #ifndef RC_INVOKED
- _BEGIN_C_DECLS
- /* Set the FPU control word as cw = (cw & ~unMask) | (unNew & unMask),
- * i.e. change the bits in unMask to have the values they have in unNew,
- * leaving other bits unchanged.
- */
- _CRTIMP __cdecl __MINGW_NOTHROW unsigned int _controlfp (unsigned int unNew, unsigned int unMask);
- _CRTIMP __cdecl __MINGW_NOTHROW unsigned int _control87 (unsigned int unNew, unsigned int unMask);
- #define _clear87 _clearfp
- #define _status87 _statusfp
- _CRTIMP __cdecl __MINGW_NOTHROW unsigned int _clearfp (void); /* Clear the FPU status word */
- _CRTIMP __cdecl __MINGW_NOTHROW unsigned int _statusfp (void); /* Report the FPU status word */
- /* MSVCRT.DLL provides _fpreset() to initialize the FPU; it initializes
- * the control register to 0x27F, (thus selecting 53-bit precision), the
- * status register to zero and the tag word to 0FFFFh. This differs from
- * Intel's default configuration, (as established by the asm instructions
- * "finit" and "fninit"), which set the control word to 0x37F, (yielding
- * 64-bit precison rather than 53-bit).
- *
- * Nominally, MinGW prefers to configure the FPU for 64-bit precision, as
- * that is a better fit for support of GCC's 10-byte long doubles. This
- * was formerly achieved by provision of an alternative implementation of
- * _fpreset(), intended to be statically linked into MinGW applications,
- * (with variants enabling 64-bit precision by default, or alternatively,
- * when the application is explicitly linked with CRT_fp8.o, providing
- * 53-bit precision instead). Unfortunately, this linking strategy may
- * lead to non-deterministic ambiguity over which _fpreset() variant is
- * called, in the event of the call originating in any user implemented,
- * or third party DLL. Consequently, support for this strategy has been
- * withdrawn. _fpreset() now ALWAYS refers to the MSVCRT.DLL function,
- * (and thus ALWAYS selects 53-bit precision); MinGW applications should
- * now use the ISO-C99 standard fesetenv() function to configure the FPU,
- * (as the start-up code now does, to enable 64-bit precision by default,
- * but continuing to support linking with CRT_fp8.o, to initialize the
- * configuration to 53-bit precision).
- */
- _CRTIMP __cdecl __MINGW_NOTHROW void _fpreset (void);
- /* Former MinGW releases also provided fpreset(), implemented as an alias
- * for _fpreset(), (in whichever guise it was deployed); deprecate this,
- * but retain the association for backward compatibility, (noting that it
- * will now redirect the call to fesetenv(), as recommended above, with
- * the configuration selection set to FE_DFL_ENV).
- */
- __cdecl __MINGW_NOTHROW void fpreset (void) __MINGW_ATTRIB_DEPRECATED;
- #ifndef __NO_INLINE__
- /* Provide the implementation of fpreset() as an inline stub; for this,
- * we need to expose a minimal opaque subset of <fenv.h>, and we assume
- * that FE_DFL_ENV is equivalent to (const fenv_t *)(0), (as it is, in
- * the MinGW implementation of <fenv.h>).
- */
- typedef struct __fenv_t fenv_t;
- __cdecl __MINGW_NOTHROW int fesetenv (const fenv_t *);
- __CRT_ALIAS __LIBIMPL__( FUNCTION = fpreset )
- void fpreset (void){ fesetenv ((const fenv_t *)(0)); }
- #endif
- /* Global 'variable' for the current floating point error code.
- */
- #define _fpecode (*(__fpecode()))
- _CRTIMP __cdecl __MINGW_NOTHROW int *__fpecode (void);
- /* IEEE recommended functions. Microsoft puts them in <float.h>,
- * but they really belong in math.h.
- */
- _CRTIMP __cdecl __MINGW_NOTHROW double _chgsign (double);
- _CRTIMP __cdecl __MINGW_NOTHROW double _copysign (double, double);
- _CRTIMP __cdecl __MINGW_NOTHROW double _logb (double);
- _CRTIMP __cdecl __MINGW_NOTHROW double _nextafter (double, double);
- _CRTIMP __cdecl __MINGW_NOTHROW double _scalb (double, long);
- _CRTIMP __cdecl __MINGW_NOTHROW int _finite (double);
- _CRTIMP __cdecl __MINGW_NOTHROW int _fpclass (double);
- _CRTIMP __cdecl __MINGW_NOTHROW int _isnan (double);
- _END_C_DECLS
- #endif /* ! RC_INVOKED */
- #endif /* !__STRICT_ANSI__ */
- #endif /* _MINGW_FLOAT_H: $RCSfile: float.h,v $: end of file */
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