169 lines
4.9 KiB
C
169 lines
4.9 KiB
C
/*
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* float.h
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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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* NOTE: GCC provides float.h, but it doesn't include the non-standard
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* stuff for accessing the fp controller. We include_next the
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* GCC-supplied header and just define the MS-specific extensions
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* here.
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*
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* This file is part of the Mingw32 package.
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*
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* Contributors:
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* Created by Colin Peters <colin@bird.fu.is.saga-u.ac.jp>
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*
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* THIS SOFTWARE IS NOT COPYRIGHTED
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*
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* This source code is offered for use in the public domain. You may
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* use, modify or distribute it freely.
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*
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* This code is distributed in the hope that it will be useful but
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* WITHOUT ANY WARRANTY. ALL WARRANTIES, EXPRESS OR IMPLIED ARE HEREBY
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* DISCLAIMED. This includes but is not limited to warranties of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
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*
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* $Revision$
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* $Author$
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* $Date$
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*
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*/
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#include_next<float.h>
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#ifndef _MINGW_FLOAT_H_
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#define _MINGW_FLOAT_H_
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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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* Functions and definitions for controlling the FPU.
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*/
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#ifndef __STRICT_ANSI__
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/* TODO: These constants are only valid for x86 machines */
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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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/* 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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/* 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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/* 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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/* 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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#ifndef RC_INVOKED
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#ifdef __cplusplus
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extern "C" {
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#endif
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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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unsigned int _controlfp (unsigned int unNew, unsigned int unMask);
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unsigned int _control87 (unsigned int unNew, unsigned int unMask);
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unsigned int _clearfp (void); /* Clear the FPU status word */
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unsigned int _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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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 _fpreset (void);
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void fpreset (void);
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/* Global 'variable' for the current floating point error code. */
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int * __fpecode(void);
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#define _fpecode (*(__fpecode()))
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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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double _chgsign (double);
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double _copysign (double, double);
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double _logb (double);
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double _nextafter (double, double);
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double _scalb (double, long);
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int _finite (double);
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int _fpclass (double);
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int _isnan (double);
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#ifdef __cplusplus
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}
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#endif
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#endif /* Not RC_INVOKED */
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#endif /* Not __STRICT_ANSI__ */
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#endif /* _FLOAT_H_ */
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