kc3-lang/gnulib/lib/nan.h

• Show log

  Commit

• Hash : 60abca9d
  Author :
  Date : 2024-04-21T01:58:39
  

  nan: Relicense under LGPLv2+.
  
  Eric Blake's approval is in
  <https://lists.gnu.org/archive/html/bug-gnulib/2024-04/msg00290.html>.
  Paul Eggert's approval is in
  <https://lists.gnu.org/archive/html/bug-gnulib/2024-04/msg00324.html>.
  Daniel Richard G.'s approval was given in private email.
  
  * modules/nan (License): Change to LGPLv2+.
  * lib/nan.h: Update license notice.
  

Download

• lib/nan.h

• /* Macros for quiet not-a-number.
     Copyright (C) 2007-2024 Free Software Foundation, Inc.
  
     This file is free software: you can redistribute it and/or modify
     it under the terms of the GNU Lesser General Public License as
     published by the Free Software Foundation; either version 2.1 of the
     License, or (at your option) any later version.
  
     This file is distributed in the hope that it will be useful,
     but WITHOUT ANY WARRANTY; without even the implied warranty of
     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
     GNU Lesser General Public License for more details.
  
     You should have received a copy of the GNU Lesser General Public License
     along with this program.  If not, see <https://www.gnu.org/licenses/>.  */
  
  #ifndef _GL_NAN_H
  #define _GL_NAN_H
  
  /* IBM z/OS supports both hexadecimal and IEEE floating-point formats. The
     former does not support NaN and its isnan() implementation returns zero
     for all values.  */
  #if defined __MVS__ && defined __IBMC__ && !defined __BFP__
  # error "NaN is not supported with IBM's hexadecimal floating-point format; please re-compile with -qfloat=ieee"
  #endif
  
  #ifdef __cplusplus
  extern "C" {
  #endif
  
  
  /* NaNf () returns a 'float' not-a-number.  */
  
  /* The Compaq (ex-DEC) C 6.4 compiler and the Microsoft MSVC 9 compiler choke
     on the expression 0.0 / 0.0.  The IBM XL C compiler on z/OS complains.
     PGI 16.10 complains.  clang 13 on mips64 does incorrect constant-folding.  */
  #if (defined __DECC || defined _MSC_VER \
       || (defined __MVS__ && defined __IBMC__) \
       || defined __PGI \
       || defined __mips__)
  static float
  NaNf ()
  {
    static float volatile zero = 0.0f;
    return zero / zero;
  }
  #else
  # define NaNf() (0.0f / 0.0f)
  #endif
  
  
  /* NaNd () returns a 'double' not-a-number.  */
  
  /* The Compaq (ex-DEC) C 6.4 compiler and the Microsoft MSVC 9 compiler choke
     on the expression 0.0 / 0.0.  The IBM XL C compiler on z/OS complains.
     PGI 16.10 complains.  clang 13 on mips64 does incorrect constant-folding.  */
  #if (defined __DECC || defined _MSC_VER \
       || (defined __MVS__ && defined __IBMC__) \
       || defined __PGI \
       || defined __mips__)
  static double
  NaNd ()
  {
    static double volatile zero = 0.0;
    return zero / zero;
  }
  #else
  # define NaNd() (0.0 / 0.0)
  #endif
  
  
  /* NaNl () returns a 'long double' not-a-number.  */
  
  /* On Irix 6.5, gcc 3.4.3 can't compute compile-time NaN, and needs the
     runtime type conversion.
     The Microsoft MSVC 9 compiler chokes on the expression 0.0L / 0.0L.
     The IBM XL C compiler on z/OS complains.
     PGI 16.10 complains.
     Avoid possible incorrect constant-folding on mips.  */
  #ifdef __sgi
  static long double NaNl ()
  {
    double zero = 0.0;
    return zero / zero;
  }
  #elif (defined _MSC_VER \
         || (defined __MVS__ && defined __IBMC__) \
         || defined __PGI \
         || defined __mips__)
  static long double
  NaNl ()
  {
    static long double volatile zero = 0.0L;
    return zero / zero;
  }
  #else
  # define NaNl() (0.0L / 0.0L)
  #endif
  
  
  #ifdef __cplusplus
  }
  #endif
  
  #endif /* _GL_NAN_H */
  

Download