/*
* float.h
* This file has no copyright assigned and is placed in the Public Domain.
* This file is a part of the mingw-runtime package.
* No warranty is given; refer to the file DISCLAIMER within the package.
*
* Constants related to floating point arithmetic.
*
* Also included here are some non-ANSI bits for accessing the floating
* point controller.
*
* NOTE: GCC provides float.h, but it doesn't include the non-standard
* stuff for accessing the fp controller. We include_next the
* GCC-supplied header and just define the MS-specific extensions
* here.
*
*/
#include_next<float.h>
#ifndef _MINGW_FLOAT_H_
#define _MINGW_FLOAT_H_
/* All the headers include this file. */
#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
/* These are also defined in Mingw math.h, needed to work around
GCC build issues. */
/* Return values for fpclass. */
#ifndef __MINGW_FPCLASS_DEFINED
#define __MINGW_FPCLASS_DEFINED 1
#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
#ifdef __cplusplus
extern "C" {
#endif
/* 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 unsigned int __cdecl __MINGW_NOTHROW _controlfp (unsigned int unNew, unsigned int unMask);
_CRTIMP unsigned int __cdecl __MINGW_NOTHROW _control87 (unsigned int unNew, unsigned int unMask);
_CRTIMP unsigned int __cdecl __MINGW_NOTHROW _clearfp (void); /* Clear the FPU status word */
_CRTIMP unsigned int __cdecl __MINGW_NOTHROW _statusfp (void); /* Report the FPU status word */
#define _clear87 _clearfp
#define _status87 _statusfp
/*
MSVCRT.dll _fpreset initializes the control register to 0x27f,
the status register to zero and the tag word to 0FFFFh.
This differs from asm instruction finit/fninit which set control
word to 0x37f (64 bit mantissa precison rather than 53 bit).
By default, the mingw version of _fpreset sets fp control as
per fninit. To use the MSVCRT.dll _fpreset, include CRT_fp8.o when
building your application.
*/
void __cdecl __MINGW_NOTHROW _fpreset (void);
void __cdecl __MINGW_NOTHROW fpreset (void);
/* Global 'variable' for the current floating point error code. */
_CRTIMP int * __cdecl __MINGW_NOTHROW __fpecode(void);
#define _fpecode (*(__fpecode()))
/*
* IEEE recommended functions. MS puts them in float.h
* but they really belong in math.h.
*/
_CRTIMP double __cdecl __MINGW_NOTHROW _chgsign (double);
_CRTIMP double __cdecl __MINGW_NOTHROW _copysign (double, double);
_CRTIMP double __cdecl __MINGW_NOTHROW _logb (double);
_CRTIMP double __cdecl __MINGW_NOTHROW _nextafter (double, double);
_CRTIMP double __cdecl __MINGW_NOTHROW _scalb (double, long);
_CRTIMP int __cdecl __MINGW_NOTHROW _finite (double);
_CRTIMP int __cdecl __MINGW_NOTHROW _fpclass (double);
_CRTIMP int __cdecl __MINGW_NOTHROW _isnan (double);
#ifdef __cplusplus
}
#endif
#endif /* Not RC_INVOKED */
#endif /* Not __STRICT_ANSI__ */
#endif /* _FLOAT_H_ */