glibc/math/test-misc.c

/* Miscellaneous tests which don't fit anywhere else.
   Copyright (C) 2000, 2001 Free Software Foundation, Inc.
   This file is part of the GNU C Library.

   The GNU C Library 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.

   The GNU C Library 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 the GNU C Library; if not, write to the Free
   Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
   02111-1307 USA.  */

#include <fenv.h>
#include <float.h>
#include <ieee754.h>
#include <math.h>
#include <stdio.h>
#include <string.h>


int
main (void)
{
  int result = 0;

#ifndef NO_LONG_DOUBLE
  {
    long double x = 0x100000001ll + (long double) 0.5;
    long double q;
    long double r;

    r = modfl (x, &q);
    if (q != (long double) 0x100000001ll || r != 0.5)
      {
	printf ("modfl (%Lg, ...) failed\n", x);
	result = 1;
      }
  }

# if __GNUC__ >= 3 || __GNUC_MINOR__ >= 96
  {
    long double x;
    long double m;
    long double r;
    int e;
    int i;

#  if LDBL_MANT_DIG == 64
    m = 0xf.fffffffffffffffp-4L;
#  elif LDBL_MANT_DIG == 106
    /* This has to match the mantissa of LDBL_MAX which actually does have a
       missing bit in the middle.  */
    m = 0x1.fffffffffffff7ffffffffffff8p-1L;
#  elif LDBL_MANT_DIG == 113
    m = 0x1.ffffffffffffffffffffffffffffp-1L;
#  else
#   error "Please adjust"
#  endif

    for (i = LDBL_MAX_EXP, x = LDBL_MAX; i >= LDBL_MIN_EXP; --i, x /= 2.0L)
      {
	printf ("2^%d: ", i);

	r = frexpl (x, &e);
	if (r != m)
	  {
	    printf ("mantissa incorrect: %.20La\n", r);
	    result = 1;
	    continue;
	  }
	if (e != i)
	  {
	    printf ("exponent wrong %d (%.20Lg)\n", e, x);
	    result = 1;
	    continue;
	  }
	puts ("ok");
      }

    for (i = LDBL_MIN_EXP, x = LDBL_MIN; i >= LDBL_MIN_EXP - LDBL_MANT_DIG + 1;
	 --i, x /= 2.0L)
      {
        printf ("2^%d: ", i);

        r = frexpl (x, &e);
        if (r != 0.5L)
          {
            printf ("mantissa incorrect: %.20La\n", r);
            result = 1;
            continue;
          }
        if (e != i)
          {
            printf ("exponent wrong %d (%.20Lg)\n", e, x);
            result = 1;
            continue;
          }
        puts ("ok");
      }

  }
# endif

#if 0
  {
    int e;
    long double r = frexpl (LDBL_MIN * LDBL_EPSILON, &e);

    if (r != 0.5)
      {
	printf ("frexpl (LDBL_MIN * LDBL_EPSILON, ...): mantissa wrong: %Lg\n",
		r);
	result = 1;
      }
    else if (e != -16444)
      {
	printf ("frexpl (LDBL_MIN * LDBL_EPSILON, ...): exponent wrong: %d\n",
		e);
	result = 1;
      }
  }
#endif
#endif

  {
    double x = 0x100000001ll + (double) 0.5;
    double q;
    double r;

    r = modf (x, &q);
    if (q != (double) 0x100000001ll || r != 0.5)
      {
	printf ("modf (%g, ...) failed\n", x);
	result = 1;
      }
  }

  {
    union ieee754_float v1;
    union ieee754_float v2;
    float f;

    v1.f = f = FLT_MIN;
    if (fpclassify (f) != FP_NORMAL)
      {
	printf ("fpclassify (FLT_MIN) failed: %d\n", fpclassify (f));
	result = 1;
      }
    f = nextafterf (f, FLT_MIN / 2.0f);
    if (fpclassify (f) != FP_SUBNORMAL)
      {
	printf ("fpclassify (FLT_MIN-epsilon) failed: %d\n", fpclassify (f));
	result = 1;
      }
    v2.f = f = nextafterf (f, FLT_MIN);
    if (fpclassify (f) != FP_NORMAL)
      {
	printf ("fpclassify (FLT_MIN-epsilon+epsilon) failed: %d\n",
		fpclassify (f));
	result = 1;
      }

    if (v1.ieee.mantissa != v2.ieee.mantissa)
      {
	printf ("FLT_MIN: mantissa differs: %8x vs %8x\n",
		v1.ieee.mantissa, v2.ieee.mantissa);
	result = 1;
      }
    if (v1.ieee.exponent != v2.ieee.exponent)
      {
	printf ("FLT_MIN: exponent differs: %4x vs %4x\n",
		v1.ieee.exponent, v2.ieee.exponent);
	result = 1;
      }
    if (v1.ieee.negative != v2.ieee.negative)
      {
	printf ("FLT_MIN: negative differs: %d vs %d\n",
		v1.ieee.negative, v2.ieee.negative);
	result = 1;
      }

    v1.f = f = -FLT_MIN;
    if (fpclassify (f) != FP_NORMAL)
      {
	printf ("fpclassify (-FLT_MIN) failed: %d\n", fpclassify (f));
	result = 1;
      }
    f = nextafterf (f, -FLT_MIN / 2.0f);
    if (fpclassify (f) != FP_SUBNORMAL)
      {
	printf ("fpclassify (-FLT_MIN-epsilon) failed: %d\n", fpclassify (f));
	result = 1;
      }
    v2.f = f = nextafterf (f, -FLT_MIN);
    if (fpclassify (f) != FP_NORMAL)
      {
	printf ("fpclassify (-FLT_MIN-epsilon+epsilon) failed: %d\n",
		fpclassify (f));
	result = 1;
      }

    if (v1.ieee.mantissa != v2.ieee.mantissa)
      {
	printf ("-FLT_MIN: mantissa differs: %8x vs %8x\n",
		v1.ieee.mantissa, v2.ieee.mantissa);
	result = 1;
      }
    if (v1.ieee.exponent != v2.ieee.exponent)
      {
	printf ("-FLT_MIN: exponent differs: %4x vs %4x\n",
		v1.ieee.exponent, v2.ieee.exponent);
	result = 1;
      }
    if (v1.ieee.negative != v2.ieee.negative)
      {
	printf ("-FLT_MIN: negative differs: %d vs %d\n",
		v1.ieee.negative, v2.ieee.negative);
	result = 1;
      }

    f = FLT_MAX;
    if (fpclassify (f) != FP_NORMAL)
      {
	printf ("fpclassify (FLT_MAX) failed: %d\n", fpclassify (f));
	result = 1;
      }
    f = nextafterf (f, INFINITY);
    if (fpclassify (f) != FP_INFINITE)
      {
	printf ("fpclassify (FLT_MAX+epsilon) failed: %d\n", fpclassify (f));
	result = 1;
      }

    f = -FLT_MAX;
    if (fpclassify (f) != FP_NORMAL)
      {
	printf ("fpclassify (-FLT_MAX) failed: %d\n", fpclassify (f));
	result = 1;
      }
    f = nextafterf (f, -INFINITY);
    if (fpclassify (f) != FP_INFINITE)
      {
	printf ("fpclassify (-FLT_MAX-epsilon) failed: %d\n", fpclassify (f));
	result = 1;
      }

    v1.f = f = 0.0625;
    f = nextafterf (f, 0.0);
    v2.f = f = nextafterf (f, 1.0);

    if (v1.ieee.mantissa != v2.ieee.mantissa)
      {
	printf ("0.0625f down: mantissa differs: %8x vs %8x\n",
		v1.ieee.mantissa, v2.ieee.mantissa);
	result = 1;
      }
    if (v1.ieee.exponent != v2.ieee.exponent)
      {
	printf ("0.0625f down: exponent differs: %4x vs %4x\n",
		v1.ieee.exponent, v2.ieee.exponent);
	result = 1;
      }
    if (v1.ieee.negative != v2.ieee.negative)
      {
	printf ("0.0625f down: negative differs: %d vs %d\n",
		v1.ieee.negative, v2.ieee.negative);
	result = 1;
      }

    v1.f = f = 0.0625;
    f = nextafterf (f, 1.0);
    v2.f = f = nextafterf (f, 0.0);

    if (v1.ieee.mantissa != v2.ieee.mantissa)
      {
	printf ("0.0625f up: mantissa differs: %8x vs %8x\n",
		v1.ieee.mantissa, v2.ieee.mantissa);
	result = 1;
      }
    if (v1.ieee.exponent != v2.ieee.exponent)
      {
	printf ("0.0625f up: exponent differs: %4x vs %4x\n",
		v1.ieee.exponent, v2.ieee.exponent);
	result = 1;
      }
    if (v1.ieee.negative != v2.ieee.negative)
      {
	printf ("0.0625f up: negative differs: %d vs %d\n",
		v1.ieee.negative, v2.ieee.negative);
	result = 1;
      }

    v1.f = f = -0.0625;
    f = nextafterf (f, 0.0);
    v2.f = f = nextafterf (f, -1.0);

    if (v1.ieee.mantissa != v2.ieee.mantissa)
      {
	printf ("-0.0625f up: mantissa differs: %8x vs %8x\n",
		v1.ieee.mantissa, v2.ieee.mantissa);
	result = 1;
      }
    if (v1.ieee.exponent != v2.ieee.exponent)
      {
	printf ("-0.0625f up: exponent differs: %4x vs %4x\n",
		v1.ieee.exponent, v2.ieee.exponent);
	result = 1;
      }
    if (v1.ieee.negative != v2.ieee.negative)
      {
	printf ("-0.0625f up: negative differs: %d vs %d\n",
		v1.ieee.negative, v2.ieee.negative);
	result = 1;
      }

    v1.f = f = -0.0625;
    f = nextafterf (f, -1.0);
    v2.f = f = nextafterf (f, 0.0);

    if (v1.ieee.mantissa != v2.ieee.mantissa)
      {
	printf ("-0.0625f down: mantissa differs: %8x vs %8x\n",
		v1.ieee.mantissa, v2.ieee.mantissa);
	result = 1;
      }
    if (v1.ieee.exponent != v2.ieee.exponent)
      {
	printf ("-0.0625f down: exponent differs: %4x vs %4x\n",
		v1.ieee.exponent, v2.ieee.exponent);
	result = 1;
      }
    if (v1.ieee.negative != v2.ieee.negative)
      {
	printf ("-0.0625f down: negative differs: %d vs %d\n",
		v1.ieee.negative, v2.ieee.negative);
	result = 1;
      }

    v1.f = f = 0.0f;
    f = nextafterf (f, 1.0);
    v2.f = nextafterf (f, -1.0);

    if (v1.ieee.mantissa != v2.ieee.mantissa)
      {
	printf ("0.0f up: mantissa differs: %8x vs %8x\n",
		v1.ieee.mantissa, v2.ieee.mantissa);
	result = 1;
      }
    if (v1.ieee.exponent != v2.ieee.exponent)
      {
	printf ("0.0f up: exponent differs: %4x vs %4x\n",
		v1.ieee.exponent, v2.ieee.exponent);
	result = 1;
      }
    if (0 != v2.ieee.negative)
      {
	printf ("0.0f up: negative differs: 0 vs %d\n",
		v2.ieee.negative);
	result = 1;
      }

    v1.f = f = 0.0f;
    f = nextafterf (f, -1.0);
    v2.f = nextafterf (f, 1.0);

    if (v1.ieee.mantissa != v2.ieee.mantissa)
      {
	printf ("0.0f down: mantissa differs: %8x vs %8x\n",
		v1.ieee.mantissa, v2.ieee.mantissa);
	result = 1;
      }
    if (v1.ieee.exponent != v2.ieee.exponent)
      {
	printf ("0.0f down: exponent differs: %4x vs %4x\n",
		v1.ieee.exponent, v2.ieee.exponent);
	result = 1;
      }
    if (1 != v2.ieee.negative)
      {
	printf ("0.0f down: negative differs: 1 vs %d\n",
		v2.ieee.negative);
	result = 1;
      }

    if (nextafterf (0.0f, INFINITY) != nextafterf (0.0f, 1.0f)
        || nextafterf (-0.0f, INFINITY) != nextafterf (-0.0f, 1.0f)
        || nextafterf (0.0f, -INFINITY) != nextafterf (0.0f, -1.0f)
        || nextafterf (-0.0f, -INFINITY) != nextafterf (-0.0f, -1.0f))
      {
	printf ("nextafterf (+-0, +-Inf) != nextafterf (+-0, +-1)\n");
	result = 1;
      }

    if (nexttowardf (0.0f, INFINITY) != nexttowardf (0.0f, 1.0f)
        || nexttowardf (-0.0f, INFINITY) != nexttowardf (-0.0f, 1.0f)
        || nexttowardf (0.0f, -INFINITY) != nexttowardf (0.0f, -1.0f)
        || nexttowardf (-0.0f, -INFINITY) != nexttowardf (-0.0f, -1.0f))
      {
	printf ("nexttowardf (+-0, +-Inf) != nexttowardf (+-0, +-1)\n");
	result = 1;
      }
  }

  {
    union ieee754_double v1;
    union ieee754_double v2;
    double d;

    v1.d = d = DBL_MIN;
    if (fpclassify (d) != FP_NORMAL)
      {
	printf ("fpclassify (DBL_MIN) failed: %d\n", fpclassify (d));
	result = 1;
      }
    d = nextafter (d, DBL_MIN / 2.0);
    if (fpclassify (d) != FP_SUBNORMAL)
      {
	printf ("fpclassify (DBL_MIN-epsilon) failed: %d\n", fpclassify (d));
	result = 1;
      }
    v2.d = d = nextafter (d, DBL_MIN);
    if (fpclassify (d) != FP_NORMAL)
      {
	printf ("fpclassify (DBL_MIN-epsilon+epsilon) failed: %d\n",
		fpclassify (d));
	result = 1;
      }

    if (v1.ieee.mantissa0 != v2.ieee.mantissa0)
      {
	printf ("DBL_MIN: mantissa0 differs: %8x vs %8x\n",
		v1.ieee.mantissa0, v2.ieee.mantissa0);
	result = 1;
      }
    if (v1.ieee.mantissa1 != v2.ieee.mantissa1)
      {
	printf ("DBL_MIN: mantissa1 differs: %8x vs %8x\n",
		v1.ieee.mantissa1, v2.ieee.mantissa1);
	result = 1;
      }
    if (v1.ieee.exponent != v2.ieee.exponent)
      {
	printf ("DBL_MIN: exponent differs: %4x vs %4x\n",
		v1.ieee.exponent, v2.ieee.exponent);
	result = 1;
      }
    if (v1.ieee.negative != v2.ieee.negative)
      {
	printf ("DBL_MIN: negative differs: %d vs %d\n",
		v1.ieee.negative, v2.ieee.negative);
	result = 1;
      }

    v1.d = d = -DBL_MIN;
    if (fpclassify (d) != FP_NORMAL)
      {
	printf ("fpclassify (-DBL_MIN) failed: %d\n", fpclassify (d));
	result = 1;
      }
    d = nextafter (d, -DBL_MIN / 2.0);
    if (fpclassify (d) != FP_SUBNORMAL)
      {
	printf ("fpclassify (-DBL_MIN-epsilon) failed: %d\n", fpclassify (d));
	result = 1;
      }
    v2.d = d = nextafter (d, -DBL_MIN);
    if (fpclassify (d) != FP_NORMAL)
      {
	printf ("fpclassify (-DBL_MIN-epsilon+epsilon) failed: %d\n",
		fpclassify (d));
	result = 1;
      }

    if (v1.ieee.mantissa0 != v2.ieee.mantissa0)
      {
	printf ("-DBL_MIN: mantissa0 differs: %8x vs %8x\n",
		v1.ieee.mantissa0, v2.ieee.mantissa0);
	result = 1;
      }
    if (v1.ieee.mantissa1 != v2.ieee.mantissa1)
      {
	printf ("-DBL_MIN: mantissa1 differs: %8x vs %8x\n",
		v1.ieee.mantissa1, v2.ieee.mantissa1);
	result = 1;
      }
    if (v1.ieee.exponent != v2.ieee.exponent)
      {
	printf ("-DBL_MIN: exponent differs: %4x vs %4x\n",
		v1.ieee.exponent, v2.ieee.exponent);
	result = 1;
      }
    if (v1.ieee.negative != v2.ieee.negative)
      {
	printf ("-DBL_MIN: negative differs: %d vs %d\n",
		v1.ieee.negative, v2.ieee.negative);
	result = 1;
      }

    d = DBL_MAX;
    if (fpclassify (d) != FP_NORMAL)
      {
	printf ("fpclassify (DBL_MAX) failed: %d\n", fpclassify (d));
	result = 1;
      }
    d = nextafter (d, INFINITY);
    if (fpclassify (d) != FP_INFINITE)
      {
	printf ("fpclassify (DBL_MAX+epsilon) failed: %d\n", fpclassify (d));
	result = 1;
      }

    d = -DBL_MAX;
    if (fpclassify (d) != FP_NORMAL)
      {
	printf ("fpclassify (-DBL_MAX) failed: %d\n", fpclassify (d));
	result = 1;
      }
    d = nextafter (d, -INFINITY);
    if (fpclassify (d) != FP_INFINITE)
      {
	printf ("fpclassify (-DBL_MAX-epsilon) failed: %d\n", fpclassify (d));
	result = 1;
      }

    v1.d = d = 0.0625;
    d = nextafter (d, 0.0);
    v2.d = d = nextafter (d, 1.0);

    if (v1.ieee.mantissa0 != v2.ieee.mantissa0)
      {
	printf ("0.0625 down: mantissa0 differs: %8x vs %8x\n",
		v1.ieee.mantissa0, v2.ieee.mantissa0);
	result = 1;
      }
    if (v1.ieee.mantissa1 != v2.ieee.mantissa1)
      {
	printf ("0.0625 down: mantissa1 differs: %8x vs %8x\n",
		v1.ieee.mantissa1, v2.ieee.mantissa1);
	result = 1;
      }
    if (v1.ieee.exponent != v2.ieee.exponent)
      {
	printf ("0.0625 down: exponent differs: %4x vs %4x\n",
		v1.ieee.exponent, v2.ieee.exponent);
	result = 1;
      }
    if (v1.ieee.negative != v2.ieee.negative)
      {
	printf ("0.0625 down: negative differs: %d vs %d\n",
		v1.ieee.negative, v2.ieee.negative);
	result = 1;
      }

    v1.d = d = 0.0625;
    d = nextafter (d, 1.0);
    v2.d = d = nextafter (d, 0.0);

    if (v1.ieee.mantissa0 != v2.ieee.mantissa0)
      {
	printf ("0.0625 up: mantissa0 differs: %8x vs %8x\n",
		v1.ieee.mantissa0, v2.ieee.mantissa0);
	result = 1;
      }
    if (v1.ieee.mantissa1 != v2.ieee.mantissa1)
      {
	printf ("0.0625 up: mantissa1 differs: %8x vs %8x\n",
		v1.ieee.mantissa1, v2.ieee.mantissa1);
	result = 1;
      }
    if (v1.ieee.exponent != v2.ieee.exponent)
      {
	printf ("0.0625 up: exponent differs: %4x vs %4x\n",
		v1.ieee.exponent, v2.ieee.exponent);
	result = 1;
      }
    if (v1.ieee.negative != v2.ieee.negative)
      {
	printf ("0.0625 up: negative differs: %d vs %d\n",
		v1.ieee.negative, v2.ieee.negative);
	result = 1;
      }

    v1.d = d = -0.0625;
    d = nextafter (d, 0.0);
    v2.d = d = nextafter (d, -1.0);

    if (v1.ieee.mantissa0 != v2.ieee.mantissa0)
      {
	printf ("-0.0625 up: mantissa0 differs: %8x vs %8x\n",
		v1.ieee.mantissa0, v2.ieee.mantissa0);
	result = 1;
      }
    if (v1.ieee.mantissa1 != v2.ieee.mantissa1)
      {
	printf ("-0.0625 up: mantissa1 differs: %8x vs %8x\n",
		v1.ieee.mantissa1, v2.ieee.mantissa1);
	result = 1;
      }
    if (v1.ieee.exponent != v2.ieee.exponent)
      {
	printf ("-0.0625 up: exponent differs: %4x vs %4x\n",
		v1.ieee.exponent, v2.ieee.exponent);
	result = 1;
      }
    if (v1.ieee.negative != v2.ieee.negative)
      {
	printf ("-0.0625 up: negative differs: %d vs %d\n",
		v1.ieee.negative, v2.ieee.negative);
	result = 1;
      }

    v1.d = d = -0.0625;
    d = nextafter (d, -1.0);
    v2.d = d = nextafter (d, 0.0);

    if (v1.ieee.mantissa0 != v2.ieee.mantissa0)
      {
	printf ("-0.0625 down: mantissa0 differs: %8x vs %8x\n",
		v1.ieee.mantissa0, v2.ieee.mantissa0);
	result = 1;
      }
    if (v1.ieee.mantissa1 != v2.ieee.mantissa1)
      {
	printf ("-0.0625 down: mantissa1 differs: %8x vs %8x\n",
		v1.ieee.mantissa1, v2.ieee.mantissa1);
	result = 1;
      }
    if (v1.ieee.exponent != v2.ieee.exponent)
      {
	printf ("-0.0625 down: exponent differs: %4x vs %4x\n",
		v1.ieee.exponent, v2.ieee.exponent);
	result = 1;
      }
    if (v1.ieee.negative != v2.ieee.negative)
      {
	printf ("-0.0625 down: negative differs: %d vs %d\n",
		v1.ieee.negative, v2.ieee.negative);
	result = 1;
      }

    v1.d = d = 0.0;
    d = nextafter (d, 1.0);
    v2.d = nextafter (d, -1.0);

    if (v1.ieee.mantissa0 != v2.ieee.mantissa0)
      {
	printf ("0.0 up: mantissa0 differs: %8x vs %8x\n",
		v1.ieee.mantissa0, v2.ieee.mantissa0);
	result = 1;
      }
    if (v1.ieee.mantissa1 != v2.ieee.mantissa1)
      {
	printf ("0.0 up: mantissa1 differs: %8x vs %8x\n",
		v1.ieee.mantissa1, v2.ieee.mantissa1);
	result = 1;
      }
    if (v1.ieee.exponent != v2.ieee.exponent)
      {
	printf ("0.0 up: exponent differs: %4x vs %4x\n",
		v1.ieee.exponent, v2.ieee.exponent);
	result = 1;
      }
    if (0 != v2.ieee.negative)
      {
	printf ("0.0 up: negative differs: 0 vs %d\n",
		v2.ieee.negative);
	result = 1;
      }

    v1.d = d = 0.0;
    d = nextafter (d, -1.0);
    v2.d = nextafter (d, 1.0);

    if (v1.ieee.mantissa0 != v2.ieee.mantissa0)
      {
	printf ("0.0 down: mantissa0 differs: %8x vs %8x\n",
		v1.ieee.mantissa0, v2.ieee.mantissa0);
	result = 1;
      }
    if (v1.ieee.mantissa1 != v2.ieee.mantissa1)
      {
	printf ("0.0 down: mantissa1 differs: %8x vs %8x\n",
		v1.ieee.mantissa1, v2.ieee.mantissa1);
	result = 1;
      }
    if (v1.ieee.exponent != v2.ieee.exponent)
      {
	printf ("0.0 down: exponent differs: %4x vs %4x\n",
		v1.ieee.exponent, v2.ieee.exponent);
	result = 1;
      }
    if (1 != v2.ieee.negative)
      {
	printf ("0.0 down: negative differs: 1 vs %d\n",
		v2.ieee.negative);
	result = 1;
      }

    if (nextafter (0.0, INFINITY) != nextafter (0.0, 1.0)
        || nextafter (-0.0, INFINITY) != nextafter (-0.0, 1.0)
        || nextafter (0.0, -INFINITY) != nextafter (0.0, -1.0)
        || nextafter (-0.0, -INFINITY) != nextafter (-0.0, -1.0))
      {
	printf ("nextafter (+-0, +-Inf) != nextafter (+-0, +-1)\n");
	result = 1;
      }

    if (nexttoward (0.0, INFINITY) != nexttoward (0.0, 1.0)
        || nexttoward (-0.0, INFINITY) != nexttoward (-0.0, 1.0)
        || nexttoward (0.0, -INFINITY) != nexttoward (0.0, -1.0)
        || nexttoward (-0.0, -INFINITY) != nexttoward (-0.0, -1.0))
      {
	printf ("nexttoward (+-0, +-Inf) != nexttoward (+-0, +-1)\n");
	result = 1;
      }
  }

#ifndef NO_LONG_DOUBLE
  {
    union ieee854_long_double v1;
    union ieee854_long_double v2;
    long double ld;

    v1.d = ld = LDBL_MIN;
    if (fpclassify (ld) != FP_NORMAL)
      {
	printf ("fpclassify (LDBL_MIN) failed: %d\n", fpclassify (ld));
	result = 1;
      }
    ld = nextafterl (ld, LDBL_MIN / 2.0);
    if (fpclassify (ld) != FP_SUBNORMAL)
      {
	printf ("fpclassify (LDBL_MIN-epsilon) failed: %d (%La)\n",
		fpclassify (ld), ld);
	result = 1;
      }
    v2.d = ld = nextafterl (ld, LDBL_MIN);
    if (fpclassify (ld) != FP_NORMAL)
      {
	printf ("fpclassify (LDBL_MIN-epsilon+epsilon) failed: %d (%La)\n",
		fpclassify (ld), ld);
	result = 1;
      }

    if (v1.ieee.mantissa0 != v2.ieee.mantissa0)
      {
	printf ("LDBL_MIN: mantissa0 differs: %8x vs %8x\n",
		v1.ieee.mantissa0, v2.ieee.mantissa0);
	result = 1;
      }
    if (v1.ieee.mantissa1 != v2.ieee.mantissa1)
      {
	printf ("LDBL_MIN: mantissa1 differs: %8x vs %8x\n",
		v1.ieee.mantissa1, v2.ieee.mantissa1);
	result = 1;
      }
    if (v1.ieee.exponent != v2.ieee.exponent)
      {
	printf ("LDBL_MIN: exponent differs: %4x vs %4x\n",
		v1.ieee.exponent, v2.ieee.exponent);
	result = 1;
      }
    if (v1.ieee.negative != v2.ieee.negative)
      {
	printf ("LDBL_MIN: negative differs: %d vs %d\n",
		v1.ieee.negative, v2.ieee.negative);
	result = 1;
      }

    v1.d = ld = -LDBL_MIN;
    if (fpclassify (ld) != FP_NORMAL)
      {
	printf ("fpclassify (-LDBL_MIN) failed: %d\n", fpclassify (ld));
	result = 1;
      }
    ld = nextafterl (ld, -LDBL_MIN / 2.0);
    if (fpclassify (ld) != FP_SUBNORMAL)
      {
	printf ("fpclassify (-LDBL_MIN-epsilon) failed: %d (%La)\n",
		fpclassify (ld), ld);
	result = 1;
      }
    v2.d = ld = nextafterl (ld, -LDBL_MIN);
    if (fpclassify (ld) != FP_NORMAL)
      {
	printf ("fpclassify (-LDBL_MIN-epsilon+epsilon) failed: %d (%La)\n",
		fpclassify (ld), ld);
	result = 1;
      }

    if (v1.ieee.mantissa0 != v2.ieee.mantissa0)
      {
	printf ("-LDBL_MIN: mantissa0 differs: %8x vs %8x\n",
		v1.ieee.mantissa0, v2.ieee.mantissa0);
	result = 1;
      }
    if (v1.ieee.mantissa1 != v2.ieee.mantissa1)
      {
	printf ("-LDBL_MIN: mantissa1 differs: %8x vs %8x\n",
		v1.ieee.mantissa1, v2.ieee.mantissa1);
	result = 1;
      }
    if (v1.ieee.exponent != v2.ieee.exponent)
      {
	printf ("-LDBL_MIN: exponent differs: %4x vs %4x\n",
		v1.ieee.exponent, v2.ieee.exponent);
	result = 1;
      }
    if (v1.ieee.negative != v2.ieee.negative)
      {
	printf ("-LDBL_MIN: negative differs: %d vs %d\n",
		v1.ieee.negative, v2.ieee.negative);
	result = 1;
      }

    ld = LDBL_MAX;
    if (fpclassify (ld) != FP_NORMAL)
      {
	printf ("fpclassify (LDBL_MAX) failed: %d\n", fpclassify (ld));
	result = 1;
      }
    ld = nextafterl (ld, INFINITY);
    if (fpclassify (ld) != FP_INFINITE)
      {
	printf ("fpclassify (LDBL_MAX+epsilon) failed: %d\n", fpclassify (ld));
	result = 1;
      }

    ld = -LDBL_MAX;
    if (fpclassify (ld) != FP_NORMAL)
      {
	printf ("fpclassify (-LDBL_MAX) failed: %d\n", fpclassify (ld));
	result = 1;
      }
    ld = nextafterl (ld, -INFINITY);
    if (fpclassify (ld) != FP_INFINITE)
      {
	printf ("fpclassify (-LDBL_MAX-epsilon) failed: %d\n",
		fpclassify (ld));
	result = 1;
      }

    v1.d = ld = 0.0625;
    ld = nextafterl (ld, 0.0);
    v2.d = ld = nextafterl (ld, 1.0);

    if (v1.ieee.mantissa0 != v2.ieee.mantissa0)
      {
	printf ("0.0625L down: mantissa0 differs: %8x vs %8x\n",
		v1.ieee.mantissa0, v2.ieee.mantissa0);
	result = 1;
      }
    if (v1.ieee.mantissa1 != v2.ieee.mantissa1)
      {
	printf ("0.0625L down: mantissa1 differs: %8x vs %8x\n",
		v1.ieee.mantissa1, v2.ieee.mantissa1);
	result = 1;
      }
    if (v1.ieee.exponent != v2.ieee.exponent)
      {
	printf ("0.0625L down: exponent differs: %4x vs %4x\n",
		v1.ieee.exponent, v2.ieee.exponent);
	result = 1;
      }
    if (v1.ieee.negative != v2.ieee.negative)
      {
	printf ("0.0625L down: negative differs: %d vs %d\n",
		v1.ieee.negative, v2.ieee.negative);
	result = 1;
      }

    v1.d = ld = 0.0625;
    ld = nextafterl (ld, 1.0);
    v2.d = ld = nextafterl (ld, 0.0);

    if (v1.ieee.mantissa0 != v2.ieee.mantissa0)
      {
	printf ("0.0625L up: mantissa0 differs: %8x vs %8x\n",
		v1.ieee.mantissa0, v2.ieee.mantissa0);
	result = 1;
      }
    if (v1.ieee.mantissa1 != v2.ieee.mantissa1)
      {
	printf ("0.0625L up: mantissa1 differs: %8x vs %8x\n",
		v1.ieee.mantissa1, v2.ieee.mantissa1);
	result = 1;
      }
    if (v1.ieee.exponent != v2.ieee.exponent)
      {
	printf ("0.0625L up: exponent differs: %4x vs %4x\n",
		v1.ieee.exponent, v2.ieee.exponent);
	result = 1;
      }
    if (v1.ieee.negative != v2.ieee.negative)
      {
	printf ("0.0625L up: negative differs: %d vs %d\n",
		v1.ieee.negative, v2.ieee.negative);
	result = 1;
      }

    v1.d = ld = -0.0625;
    ld = nextafterl (ld, 0.0);
    v2.d = ld = nextafterl (ld, -1.0);

    if (v1.ieee.mantissa0 != v2.ieee.mantissa0)
      {
	printf ("-0.0625L up: mantissa0 differs: %8x vs %8x\n",
		v1.ieee.mantissa0, v2.ieee.mantissa0);
	result = 1;
      }
    if (v1.ieee.mantissa1 != v2.ieee.mantissa1)
      {
	printf ("-0.0625L up: mantissa1 differs: %8x vs %8x\n",
		v1.ieee.mantissa1, v2.ieee.mantissa1);
	result = 1;
      }
    if (v1.ieee.exponent != v2.ieee.exponent)
      {
	printf ("-0.0625L up: exponent differs: %4x vs %4x\n",
		v1.ieee.exponent, v2.ieee.exponent);
	result = 1;
      }
    if (v1.ieee.negative != v2.ieee.negative)
      {
	printf ("-0.0625L up: negative differs: %d vs %d\n",
		v1.ieee.negative, v2.ieee.negative);
	result = 1;
      }

    v1.d = ld = -0.0625;
    ld = nextafterl (ld, -1.0);
    v2.d = ld = nextafterl (ld, 0.0);

    if (v1.ieee.mantissa0 != v2.ieee.mantissa0)
      {
	printf ("-0.0625L down: mantissa0 differs: %8x vs %8x\n",
		v1.ieee.mantissa0, v2.ieee.mantissa0);
	result = 1;
      }
    if (v1.ieee.mantissa1 != v2.ieee.mantissa1)
      {
	printf ("-0.0625L down: mantissa1 differs: %8x vs %8x\n",
		v1.ieee.mantissa1, v2.ieee.mantissa1);
	result = 1;
      }
    if (v1.ieee.exponent != v2.ieee.exponent)
      {
	printf ("-0.0625L down: exponent differs: %4x vs %4x\n",
		v1.ieee.exponent, v2.ieee.exponent);
	result = 1;
      }
    if (v1.ieee.negative != v2.ieee.negative)
      {
	printf ("-0.0625L down: negative differs: %d vs %d\n",
		v1.ieee.negative, v2.ieee.negative);
	result = 1;
      }

    v1.d = ld = 0.0;
    ld = nextafterl (ld, 1.0);
    v2.d = nextafterl (ld, -1.0);

    if (v1.ieee.mantissa0 != v2.ieee.mantissa0)
      {
	printf ("0.0L up: mantissa0 differs: %8x vs %8x\n",
		v1.ieee.mantissa0, v2.ieee.mantissa0);
	result = 1;
      }
    if (v1.ieee.mantissa1 != v2.ieee.mantissa1)
      {
	printf ("0.0L up: mantissa1 differs: %8x vs %8x\n",
		v1.ieee.mantissa1, v2.ieee.mantissa1);
	result = 1;
      }
    if (v1.ieee.exponent != v2.ieee.exponent)
      {
	printf ("0.0L up: exponent differs: %4x vs %4x\n",
		v1.ieee.exponent, v2.ieee.exponent);
	result = 1;
      }
    if (0 != v2.ieee.negative)
      {
	printf ("0.0L up: negative differs: 0 vs %d\n",
		v2.ieee.negative);
	result = 1;
      }

    v1.d = ld = 0.0;
    ld = nextafterl (ld, -1.0);
    v2.d = nextafterl (ld, 1.0);

    if (v1.ieee.mantissa0 != v2.ieee.mantissa0)
      {
	printf ("0.0L down: mantissa0 differs: %8x vs %8x\n",
		v1.ieee.mantissa0, v2.ieee.mantissa0);
	result = 1;
      }
    if (v1.ieee.mantissa1 != v2.ieee.mantissa1)
      {
	printf ("0.0L down: mantissa1 differs: %8x vs %8x\n",
		v1.ieee.mantissa1, v2.ieee.mantissa1);
	result = 1;
      }
    if (v1.ieee.exponent != v2.ieee.exponent)
      {
	printf ("0.0L down: exponent differs: %4x vs %4x\n",
		v1.ieee.exponent, v2.ieee.exponent);
	result = 1;
      }
    if (1 != v2.ieee.negative)
      {
	printf ("0.0L down: negative differs: 1 vs %d\n",
		v2.ieee.negative);
	result = 1;
      }

    if (nextafterl (0.0, INFINITY) != nextafterl (0.0, 1.0)
        || nextafterl (-0.0, INFINITY) != nextafterl (-0.0, 1.0)
        || nextafterl (0.0, -INFINITY) != nextafterl (0.0, -1.0)
        || nextafterl (-0.0, -INFINITY) != nextafterl (-0.0, -1.0))
      {
	printf ("nextafterl (+-0, +-Inf) != nextafterl (+-0, +-1)\n");
	result = 1;
      }

    if (nexttowardl (0.0L, INFINITY) != nexttowardl (0.0L, 1.0L)
        || nexttowardl (-0.0L, INFINITY) != nexttowardl (-0.0L, 1.0L)
        || nexttowardl (0.0L, -INFINITY) != nexttowardl (0.0L, -1.0L)
        || nexttowardl (-0.0L, -INFINITY) != nexttowardl (-0.0L, -1.0L))
      {
	printf ("nexttowardl (+-0, +-Inf) != nexttowardl (+-0, +-1)\n");
	result = 1;
      }
  }
#endif

  if (! isnormal (FLT_MIN))
    {
      puts ("isnormal (FLT_MIN) failed");
      result = 1;
    }
  if (! isnormal (DBL_MIN))
    {
      puts ("isnormal (DBL_MIN) failed");
      result = 1;
    }
#ifndef NO_LONG_DOUBLE
  if (! isnormal (LDBL_MIN))
    {
      puts ("isnormal (LDBL_MIN) failed");
      result = 1;
    }
#endif

#ifdef __i386__
  /* This is a test for the strange long doubles in x86 FPUs.  */
  {
    union
    {
      char b[10];
      long double d;
    } u =
      { .b = { 0, 0, 0, 0, 0, 0, 0, 0x80, 0, 0 } };

    if (fpclassify (u.d) != FP_NORMAL)
      {
	printf ("fpclassify (0x00008000000000000000) failed: %d (%Lg)\n",
		fpclassify (u.d), u.d);
	result = 1;
      }
  }

  /* Special NaNs in x86 long double.  Test for scalbl.  */
  {
    union
    {
      char b[10];
      long double d;
    } u =
      { .b = { 0, 1, 0, 0, 0, 0, 0, 0xc0, 0xff, 0x7f } };
    long double r;

    r = scalbl (u.d, 0.0);
    if (!isnan (r))
      {
	puts ("scalbl(NaN, 0) does not return NaN");
	result = 1;
      }
    else if (memcmp (&r, &u.d, sizeof (double)) != 0)
      {
	puts ("scalbl(NaN, 0) does not return the same NaN");
	result = 1;
      }
  }
#endif

#ifndef NO_LONG_DOUBLE
  {
    long double r;

    feclearexcept (FE_ALL_EXCEPT);
    r = scalbl (LDBL_MIN, 2147483647);
    if (! isinf (r))
      {
	puts ("scalbl (LDBL_MIN, 2147483647) does not return Inf");
	result = 1;
      }
    else if (signbit (r) != 0)
      {
	puts ("scalbl (LDBL_MIN, 2147483647) returns -Inf");
	result = 1;
      }
    else if (fetestexcept (FE_UNDERFLOW))
      {
	puts ("scalbl(NaN, 0) raises underflow exception");
	result = 1;
      }

    feclearexcept (FE_ALL_EXCEPT);
    r = scalbl (LDBL_MAX, -2147483647);
    if (r != 0.0)
      {
	puts ("scalbl (LDBL_MAX, -2147483647) does not return 0");
	result = 1;
      }
    else if (signbit (r) != 0)
      {
	puts ("scalbl (LDBL_MAX, -2147483647) returns -Inf");
	result = 1;
      }
    else if (fetestexcept (FE_OVERFLOW))
      {
	puts ("scalbl(NaN, 0) raises overflow exception");
	result = 1;
      }
  }
#endif

  return result;
}