kc3-lang/gnulib/lib/ilogb.c

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• Hash : 32a72f45
  Author :
  Date : 2023-01-01T01:14:21
  

  maint: run 'make update-copyright'
  

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• lib/ilogb.c

• /* Floating-point exponent.
     Copyright (C) 2012-2023 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 3 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/>.  */
  
  #if ! (defined USE_LONG_DOUBLE || defined USE_FLOAT)
  # include <config.h>
  #endif
  
  /* Specification.  */
  #include <math.h>
  
  #include <limits.h>
  
  #ifdef USE_LONG_DOUBLE
  # define ILOGB ilogbl
  # define DOUBLE long double
  # define L_(literal) literal##L
  # define FREXP frexpl
  # define ISNAN isnanl
  #elif ! defined USE_FLOAT
  # define ILOGB ilogb
  # define DOUBLE double
  # define L_(literal) literal
  # define FREXP frexp
  # define ISNAN isnand
  #else /* defined USE_FLOAT */
  # define ILOGB ilogbf
  # define DOUBLE float
  # define L_(literal) literal##f
  # define FREXP frexpf
  # define ISNAN isnanf
  #endif
  
  int
  ILOGB (DOUBLE x)
  {
    if (isfinite (x))
      {
        if (x == L_(0.0))
          return FP_ILOGB0;
        else
          {
            int e;
  
            (void) FREXP (x, &e);
            return e - 1;
          }
      }
    else
      {
        if (ISNAN (x))
          return FP_ILOGBNAN;
        else
          return INT_MAX;
      }
  }
  

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