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/* Test of copysignl() function.
   Copyright (C) 2010-2025 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 <https://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 <float.h>
#include <string.h>

volatile long double x;
volatile long double y;
long double z;
long double zero = 0.0L;

/* Number of bytes occupied by a 'long double' in memory.  */
#if (defined __ia64 || (defined __x86_64__ || defined __amd64__) || (defined __i386 || defined __i386__ || defined _I386 || defined _M_IX86 || defined _X86_)) && LDBL_MANT_DIG == 64
/* 'long double' is little-endian 80-bits "extended precision".  */
# define LDBL_BYTES 10
#else
# define LDBL_BYTES sizeof (long double)
#endif

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, LDBL_BYTES) == 0);

  x = 0.0L;
  y = -1.0L;
  z = copysignl (x, y);
  ASSERT (z == 0.0L);
  ASSERT (memcmp (&z, &zero, LDBL_BYTES) != 0);

  x = minus_zerol;
  y = 1.0L;
  z = copysignl (x, y);
  ASSERT (z == 0.0L);
  ASSERT (memcmp (&z, &zero, LDBL_BYTES) == 0);

  x = minus_zerol;
  y = -1.0L;
  z = copysignl (x, y);
  ASSERT (z == 0.0L);
  ASSERT (memcmp (&z, &zero, LDBL_BYTES) != 0);

  return test_exit_status;
}
kc3-lang/gnulib/tests/test-copysignl.c

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tests/test-copysignl.c
