/* Test of splitting a 'long double' into fraction and mantissa.
- Copyright (C) 2007 Free Software Foundation, Inc.
+ Copyright (C) 2007-2011 Free Software Foundation, Inc.
- This program is free software; you can redistribute it and/or modify
+ 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 2, or (at your option)
- any later version.
+ 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
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, write to the Free Software Foundation,
- Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA. */
+ along with this program. If not, see <http://www.gnu.org/licenses/>. */
/* Written by Bruno Haible <bruno@clisp.org>, 2007. */
#include <math.h>
+#include "signature.h"
+SIGNATURE_CHECK (frexpl, long double, (long double, int *));
+
#include <float.h>
-#include <stdlib.h>
-#define ASSERT(expr) if (!(expr)) abort ();
+#include "fpucw.h"
+#include "isnanl-nolibm.h"
+#include "minus-zero.h"
+#include "nan.h"
+#include "macros.h"
+
+/* Avoid some warnings from "gcc -Wshadow".
+ This file doesn't use the exp() function. */
+#undef exp
+#define exp exponent
+
+/* On MIPS IRIX machines, LDBL_MIN_EXP is -1021, but the smallest reliable
+ exponent for 'long double' is -964. Similarly, on PowerPC machines,
+ LDBL_MIN_EXP is -1021, but the smallest reliable exponent for 'long double'
+ is -968. For exponents below that, the precision may be truncated to the
+ precision used for 'double'. */
+#ifdef __sgi
+# define MIN_NORMAL_EXP (LDBL_MIN_EXP + 57)
+#elif defined __ppc || defined __ppc__ || defined __powerpc || defined __powerpc__
+# define MIN_NORMAL_EXP (LDBL_MIN_EXP + 53)
+#else
+# define MIN_NORMAL_EXP LDBL_MIN_EXP
+#endif
static long double
my_ldexp (long double x, int d)
{
int i;
long double x;
+ DECL_LONG_DOUBLE_ROUNDING
+
+ BEGIN_LONG_DOUBLE_ROUNDING ();
{ /* NaN. */
int exp = -9999;
long double mantissa;
- x = 0.0L / 0.0L;
+ x = NaNl ();
mantissa = frexpl (x, &exp);
- ASSERT (mantissa != mantissa);
+ ASSERT (isnanl (mantissa));
}
{ /* Positive infinity. */
mantissa = frexpl (x, &exp);
ASSERT (exp == 0);
ASSERT (mantissa == x);
+ ASSERT (!signbit (mantissa));
}
{ /* Negative zero. */
int exp = -9999;
long double mantissa;
- x = -0.0L;
+ x = minus_zerol;
mantissa = frexpl (x, &exp);
ASSERT (exp == 0);
ASSERT (mantissa == x);
+ ASSERT (signbit (mantissa));
}
for (i = 1, x = 1.0L; i <= LDBL_MAX_EXP; i++, x *= 2.0L)
ASSERT (exp == i);
ASSERT (mantissa == 0.5L);
}
- for (i = 1, x = 1.0L; i >= LDBL_MIN_EXP; i--, x *= 0.5L)
+ for (i = 1, x = 1.0L; i >= MIN_NORMAL_EXP; i--, x *= 0.5L)
{
int exp = -9999;
long double mantissa = frexpl (x, &exp);
ASSERT (exp == i);
ASSERT (mantissa == -0.5L);
}
- for (i = 1, x = -1.0L; i >= LDBL_MIN_EXP; i--, x *= 0.5L)
+ for (i = 1, x = -1.0L; i >= MIN_NORMAL_EXP; i--, x *= 0.5L)
{
int exp = -9999;
long double mantissa = frexpl (x, &exp);
ASSERT (exp == i);
ASSERT (mantissa == 0.505L);
}
- for (i = 1, x = 1.01L; i >= LDBL_MIN_EXP; i--, x *= 0.5L)
+ for (i = 1, x = 1.01L; i >= MIN_NORMAL_EXP; i--, x *= 0.5L)
{
int exp = -9999;
long double mantissa = frexpl (x, &exp);
ASSERT (exp == i);
ASSERT (mantissa == 0.866025L);
}
- for (i = 1, x = 1.73205L; i >= LDBL_MIN_EXP; i--, x *= 0.5L)
+ for (i = 1, x = 1.73205L; i >= MIN_NORMAL_EXP; i--, x *= 0.5L)
{
int exp = -9999;
long double mantissa = frexpl (x, &exp);