text: /* Test of copysignl() function.
     Copyright (C) 2010-2012 Free Software Foundation, Inc.
  
     This program is free software: you can redistribute it and/or modify
     it under the terms of the GNU General Public License as published by
     the Free Software Foundation; either version 3 of the License, or
     (at your option) any later version.
  
     This program 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 General Public License for more details.
  
     You should have received a copy of the GNU General Public License
     along with this program.  If not, see <http://www.gnu.org/licenses/>.  */
  
  /* Written by Bruno Haible <bruno@clisp.org>, 2010-2011.  */
  
  #include <config.h>
  
  #include <math.h>
  
  #include "signature.h"
  SIGNATURE_CHECK (copysignl, long double, (long double, long double));
  
  #include "macros.h"
  #include "minus-zero.h"
  
  #include <string.h>
  
  volatile long double x;
  volatile long double y;
  long double z;
  long double zero = 0.0L;
  
  int
  main ()
  {
    /* A particular value in the first quadrant.  */
    x = 0.6L;
    y = 0.8L;
    z = copysignl (x, y);
    ASSERT (z == 0.6L);
  
    /* A particular value in the second quadrant.  */
    x = -0.6L;
    y = 0.8L;
    z = copysignl (x, y);
    ASSERT (z == 0.6L);
  
    /* A particular value in the third quadrant.  */
    x = -0.6L;
    y = -0.8L;
    z = copysignl (x, y);
    ASSERT (z == -0.6L);
  
    /* A particular value in the fourth quadrant.  */
    x = 0.6L;
    y = -0.8L;
    z = copysignl (x, y);
    ASSERT (z == -0.6L);
  
    /* From signed zero.  */
    x = 1.0L;
    y = 0.0L;
    z = copysignl (x, y);
    ASSERT (z == 1.0L);
  
    x = 1.0L;
    y = minus_zerol;
    z = copysignl (x, y);
    /* Assume all gnulib targets support -0.0L, until proven otherwise.  */
    ASSERT (z == -1.0L);
  
    x = -1.0L;
    y = 0.0L;
    z = copysignl (x, y);
    ASSERT (z == 1.0L);
  
    x = -1.0L;
    y = minus_zerol;
    z = copysignl (x, y);
    ASSERT (z == -1.0L);
  
    /* To signed zero.  */
    x = 0.0L;
    y = 1.0L;
    z = copysignl (x, y);
    ASSERT (z == 0.0L);
    ASSERT (memcmp (&z, &zero, sizeof z) == 0);
  
    x = 0.0L;
    y = -1.0L;
    z = copysignl (x, y);
    ASSERT (z == 0.0L);
    ASSERT (memcmp (&z, &zero, sizeof z) != 0);
  
    x = minus_zerol;
    y = 1.0L;
    z = copysignl (x, y);
    ASSERT (z == 0.0L);
    ASSERT (memcmp (&z, &zero, sizeof z) == 0);
  
    x = minus_zerol;
    y = -1.0L;
    z = copysignl (x, y);
    ASSERT (z == 0.0L);
    ASSERT (memcmp (&z, &zero, sizeof z) != 0);
  
    return 0;
  }
  