79569444ef
2000-12-03 Ulrich Drepper <drepper@redhat.com> * math/test-misc.c (main): Add tests for frexp. Reported by Fred J. Tydeman <tydeman@tybor.com>. * sysdeps/i386/fpu/s_frexpl.S: Don't overflow during the computation.
96 lines
2.2 KiB
C
96 lines
2.2 KiB
C
/* Miscellaneous tests which don't fit anywhere else.
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Copyright (C) 2000 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Library General Public License as
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published by the Free Software Foundation; either version 2 of the
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License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Library General Public License for more details.
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You should have received a copy of the GNU Library General Public
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License along with the GNU C Library; see the file COPYING.LIB. If not,
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write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
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Boston, MA 02111-1307, USA. */
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#include <math.h>
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#include <stdio.h>
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int
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main (void)
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{
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int result = 0;
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#ifndef NO_LONG_DOUBLE
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{
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long double x = 0x100000001ll + (long double) 0.5;
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long double q;
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long double r;
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r = modfl (x, &q);
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if (q != (long double) 0x100000001ll || r != 0.5)
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{
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printf ("modfl (%Lg, ...) failed\n", x);
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result = 1;
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}
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}
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# if __GNUC__ >= 3 || __GNUC_MINOR__ >= 96
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{
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long double x = LDBL_MAX / ldexpl (1.0L, LDBL_MANT_DIG + 1);
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long double m;
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int i;
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# if LDBL_MANT_DIG == 64
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m = 0xf.fffffffffffffffp-4L;
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# else
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# error "Please adjust"
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# endif
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for (i = 0; i < LDBL_MANT_DIG + 1; ++i, x *= 2.0L)
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{
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long double r;
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int e;
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printf ("2^%d: ", LDBL_MAX_EXP - (LDBL_MANT_DIG + 1) + i);
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r = frexpl (x, &e);
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if (r != m)
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{
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printf ("mantissa incorrect: %.20La\n", r);
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result = 1;
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continue;
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}
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if (e != LDBL_MAX_EXP - (LDBL_MANT_DIG + 1) + i)
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{
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printf ("exponent wrong %d (%.20Lg)\n", e, x);
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result = 1;
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continue;
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}
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puts ("ok");
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}
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}
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# endif
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#endif
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{
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double x = 0x100000001ll + (double) 0.5;
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double q;
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double r;
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r = modf (x, &q);
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if (q != (double) 0x100000001ll || r != 0.5)
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{
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printf ("modf (%g, ...) failed\n", x);
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result = 1;
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}
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}
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return result;
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}
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