libm_support.h

glibc 2.9,最新版的C语言库函数

/* file: libm_support.h */


/*
// Copyright (c) 2000 - 2004, Intel Corporation
// All rights reserved.
//
// Contributed 2000 by the Intel Numerics Group, Intel Corporation
//
// Redistribution and use in source and binary forms, with or without
// modification, are permitted provided that the following conditions are
// met:
//
// * Redistributions of source code must retain the above copyright
// notice, this list of conditions and the following disclaimer.
//
// * Redistributions in binary form must reproduce the above copyright
// notice, this list of conditions and the following disclaimer in the
// documentation and/or other materials provided with the distribution.
//
// * The name of Intel Corporation may not be used to endorse or promote
// products derived from this software without specific prior written
// permission.

//
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL INTEL OR ITS
// CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
// EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
// PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
// PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
// OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY OR TORT (INCLUDING
// NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
// SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
//
// Intel Corporation is the author of this code, and requests that all
// problem reports or change requests be submitted to it directly at
// http://www.intel.com/software/products/opensource/libraries/num.htm.
//

// History: 02/02/2000 Initial version
//          2/28/2000 added tags for logb and nextafter
//          3/22/2000 Changes to support _LIB_VERSIONIMF variable
//                    and filled some enum gaps. Added support for C99.
//          5/31/2000 added prototypes for __libm_frexp_4l/8l
//          8/10/2000 Changed declaration of _LIB_VERSIONIMF to work for library
//                    builds and other application builds (precompiler directives).
//          8/11/2000 Added pointers-to-matherr-functions declarations to allow
//                    for user-defined matherr functions in the dll build.
//         12/07/2000 Added scalbn error_types values.
//          5/01/2001 Added error_types values for C99 nearest integer
//                    functions.
//          6/07/2001 Added error_types values for fdim.
//          6/18/2001 Added include of complex_support.h.
//          8/03/2001 Added error_types values for nexttoward, scalbln.
//          8/23/2001 Corrected tag numbers from 186 and higher.
//          8/27/2001 Added check for long int and long long int definitions.
//         12/10/2001 Added error_types for erfc.
//         12/27/2001 Added error_types for degree argument functions.
//         01/02/2002 Added error_types for tand, cotd.
//         01/04/2002 Delete include of complex_support.h
//         01/23/2002 Deleted prototypes for __libm_frexp*.  Added check for
//                    multiple int, long int, and long long int definitions.
//         05/20/2002 Added error_types for cot.
//         06/27/2002 Added error_types for sinhcosh.
//         12/05/2002 Added error_types for annuity and compound
//         04/10/2003 Added error_types for tgammal/tgamma/tgammaf
//         05/16/2003 FP-treatment macros copied here from IA32 libm_support.h
//         06/02/2003 Added pad into struct fp80 (12/16 bytes).
//         08/01/2003 Added struct ker80 and macros for multiprecision addition,
//                    subtraction, multiplication, division, square root.
//         08/07/2003 History section updated.
//         09/03/2003 ALIGN(n) macro added.
//         10/01/2003 LDOUBLE_ALIGN and fp80 corrected on linux to 16 bytes.
//         11/24/2004 Added ifdef around definitions of INT32/64
//         12/15/2004 Added error_types for exp10, nextafter, nexttoward
//                    underflow.  Moved error codes into libm_error_codes.h.
//
*/

#ifndef __LIBM_SUPPORT_H_INCLUDED__
#define __LIBM_SUPPORT_H_INCLUDED__

#ifndef _LIBC
#if !(defined(_WIN32) || defined(_WIN64))
# pragma const_seg(".rodata") /* place constant data in text (code) section */
#endif

#if defined(__ICC) || defined(__ICL) || defined(__ECC) || defined(__ECL)
# pragma warning( disable : 1682 )	/* #1682: ixplicit conversion of a 64-bit integral type to a smaller integral type (potential portability problem) */
# pragma warning( disable : 1683 )	/* #1683: explicit conversion of a 64-bit integral type to a smaller integral type (potential portability problem) */
#endif
#endif

/* macros to form a double value in hex representation (unsigned int type) */

#define DOUBLE_HEX(hi,lo) 0x##lo,0x##hi /*LITTLE_ENDIAN*/

#include "libm_cpu_defs.h"

#if !(defined (IA64))
#  include "libm_dll.h"
#  include "libm_dispatch.h"
#endif

#include "libm_error_codes.h"

struct exceptionf
{
  int type;
  char *name;
  float arg1, arg2, retval;
};

# ifdef __cplusplus
struct __exception
{
  int type;
  char *name;
  double arg1, arg2, retval;
};
# else

#  ifndef _LIBC
struct exception
{
  int type;
  char *name;
  double arg1, arg2, retval;
};
#  endif
# endif

struct exceptionl
{
  int type;
  char *name;
  long double arg1, arg2, retval;
};

#if (defined (_MS_) && defined (IA64))
#define   MATHERR_F   _matherrf
#define   MATHERR_D   _matherr
#else
#define MATHERR_F   matherrf
#define MATHERR_D   matherr
#endif

# ifdef __cplusplus
#define EXC_DECL_D  __exception
#else
// exception is a reserved name in C++
#define EXC_DECL_D  exception
#endif

extern int MATHERR_F(struct exceptionf*);
extern int MATHERR_D(struct EXC_DECL_D*);
extern int matherrl(struct exceptionl*);

#ifndef _LIBC
// Add code to support _LIB_VERSIONIMF
typedef enum
{
    _IEEE_ = -1, // IEEE-like behavior
    _SVID_,      // SysV, Rel. 4 behavior
    _XOPEN_,     // Unix98
    _POSIX_,     // Posix
    _ISOC_       // ISO C9X
} _LIB_VERSION_TYPE;
#endif

// This is a run-time variable and may affect
// floating point behavior of the libm functions

#if !defined( LIBM_BUILD )
#if defined( _DLL )
extern _LIB_VERSION_TYPE __declspec(dllimport) _LIB_VERSIONIMF;
#else
extern _LIB_VERSION_TYPE _LIB_VERSIONIMF;
#endif  /* _DLL */
#else
extern int (*pmatherrf)(struct exceptionf*);
extern int (*pmatherr)(struct EXC_DECL_D*);
extern int (*pmatherrl)(struct exceptionl*);
#endif  /* LIBM_BUILD */

/* memory format definitions (LITTLE_ENDIAN only) */

#if !(defined(SIZE_INT_32) || defined(SIZE_INT_64))
# error "You need to define SIZE_INT_32 or SIZE_INT_64"
#endif

#if (defined(SIZE_INT_32) && defined(SIZE_INT_64))
#error multiple integer size definitions; define SIZE_INT_32 or SIZE_INT_64
#endif

#if !(defined(SIZE_LONG_32) || defined(SIZE_LONG_64))
# error "You need to define SIZE_LONG_32 or SIZE_LONG_64"
#endif

#if (defined(SIZE_LONG_32) && defined(SIZE_LONG_64))
#error multiple integer size definitions; define SIZE_LONG_32 or SIZE_LONG_64
#endif

#if !defined(__USE_EXTERNAL_FPMEMTYP_H__)

#define BIAS_32  0x007F
#define BIAS_64  0x03FF
#define BIAS_80  0x3FFF

#define MAXEXP_32  0x00FE
#define MAXEXP_64  0x07FE
#define MAXEXP_80  0x7FFE

#define EXPINF_32  0x00FF
#define EXPINF_64  0x07FF
#define EXPINF_80  0x7FFF

struct fp32 { /*// sign:1 exponent:8 significand:23 (implied leading 1)*/
#if defined(SIZE_INT_32)
    unsigned significand:23;
    unsigned exponent:8;
    unsigned sign:1;
#elif defined(SIZE_INT_64)
    unsigned significand:23;
    unsigned exponent:8;
    unsigned sign:1;
#endif
};

struct fp64 { /*/ sign:1 exponent:11 significand:52 (implied leading 1)*/
#if defined(SIZE_INT_32)
    unsigned lo_significand:32;
    unsigned hi_significand:20;
    unsigned exponent:11;
    unsigned sign:1;
#elif defined(SIZE_INT_64)
    unsigned significand:52;
    unsigned exponent:11;
    unsigned sign:1;
#endif
};

struct fp80 { /*/ sign:1 exponent:15 significand:64 (NO implied bits) */
#if defined(SIZE_INT_32)
    unsigned         lo_significand;
    unsigned         hi_significand;
    unsigned         exponent:15;
    unsigned         sign:1;
#elif defined(SIZE_INT_64)
    unsigned         significand;
    unsigned         exponent:15;
    unsigned         sign:1;
#endif
    unsigned         pad:16;
#if !(defined(__unix__) && defined(__i386__))
    unsigned         padwin:32;
#endif
};

#endif /*__USE_EXTERNAL_FPMEMTYP_H__*/