/* Test of splitting a double into fraction and mantissa.
- Copyright (C) 2007 Free Software Foundation, Inc.
+ Copyright (C) 2007-2014 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 <float.h>
-#include <stdlib.h>
+#include "signature.h"
+SIGNATURE_CHECK (frexp, double, (double, int *));
-#define ASSERT(expr) if (!(expr)) abort ();
+#include <float.h>
-static double
-my_ldexp (double x, int d)
-{
- for (; d > 0; d--)
- x *= 2.0;
- for (; d < 0; d++)
- x *= 0.5;
- return x;
-}
+#include "isnand-nolibm.h"
+#include "minus-zero.h"
+#include "infinity.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
+
+#undef INFINITY
+#undef NAN
+
+#define DOUBLE double
+/* The use of 'volatile' guarantees that excess precision bits are dropped
+ when dealing with denormalized numbers. It is necessary on x86 systems
+ where double-floats are not IEEE compliant by default, to avoid that the
+ results become platform and compiler option dependent. 'volatile' is a
+ portable alternative to gcc's -ffloat-store option. */
+#define VOLATILE volatile
+#define ISNAN isnand
+#define INFINITY Infinityd ()
+#define NAN NaNd ()
+#define L_(literal) literal
+#define MINUS_ZERO minus_zerod
+#define MAX_EXP DBL_MAX_EXP
+#define MIN_EXP DBL_MIN_EXP
+#define MIN_NORMAL_EXP DBL_MIN_EXP
+#define FREXP frexp
+#define RANDOM randomd
+#include "test-frexp.h"
int
main ()
{
- int i;
- /* The use of 'volatile' guarantees that excess precision bits are dropped
- when dealing with denormalized numbers. It is necessary on x86 systems
- where double-floats are not IEEE compliant by default, to avoid that the
- results become platform and compiler option dependent. 'volatile' is a
- portable alternative to gcc's -ffloat-store option. */
- volatile double x;
-
- { /* NaN. */
- int exp = -9999;
- double mantissa;
- x = 0.0 / 0.0;
- mantissa = frexp (x, &exp);
- ASSERT (mantissa != mantissa);
- }
-
- { /* Positive infinity. */
- int exp = -9999;
- double mantissa;
- x = 1.0 / 0.0;
- mantissa = frexp (x, &exp);
- ASSERT (mantissa == x);
- }
-
- { /* Negative infinity. */
- int exp = -9999;
- double mantissa;
- x = -1.0 / 0.0;
- mantissa = frexp (x, &exp);
- ASSERT (mantissa == x);
- }
-
- { /* Positive zero. */
- int exp = -9999;
- double mantissa;
- x = 0.0;
- mantissa = frexp (x, &exp);
- ASSERT (exp == 0);
- ASSERT (mantissa == x);
- }
-
- { /* Negative zero. */
- int exp = -9999;
- double mantissa;
- x = -0.0;
- mantissa = frexp (x, &exp);
- ASSERT (exp == 0);
- ASSERT (mantissa == x);
- }
-
- for (i = 1, x = 1.0; i <= DBL_MAX_EXP; i++, x *= 2.0)
- {
- int exp = -9999;
- double mantissa = frexp (x, &exp);
- ASSERT (exp == i);
- ASSERT (mantissa == 0.5);
- }
- for (i = 1, x = 1.0; i >= DBL_MIN_EXP; i--, x *= 0.5)
- {
- int exp = -9999;
- double mantissa = frexp (x, &exp);
- ASSERT (exp == i);
- ASSERT (mantissa == 0.5);
- }
- for (; i >= DBL_MIN_EXP - 100 && x > 0.0; i--, x *= 0.5)
- {
- int exp = -9999;
- double mantissa = frexp (x, &exp);
- ASSERT (exp == i);
- ASSERT (mantissa == 0.5);
- }
-
- for (i = 1, x = -1.0; i <= DBL_MAX_EXP; i++, x *= 2.0)
- {
- int exp = -9999;
- double mantissa = frexp (x, &exp);
- ASSERT (exp == i);
- ASSERT (mantissa == -0.5);
- }
- for (i = 1, x = -1.0; i >= DBL_MIN_EXP; i--, x *= 0.5)
- {
- int exp = -9999;
- double mantissa = frexp (x, &exp);
- ASSERT (exp == i);
- ASSERT (mantissa == -0.5);
- }
- for (; i >= DBL_MIN_EXP - 100 && x < 0.0; i--, x *= 0.5)
- {
- int exp = -9999;
- double mantissa = frexp (x, &exp);
- ASSERT (exp == i);
- ASSERT (mantissa == -0.5);
- }
-
- for (i = 1, x = 1.01; i <= DBL_MAX_EXP; i++, x *= 2.0)
- {
- int exp = -9999;
- double mantissa = frexp (x, &exp);
- ASSERT (exp == i);
- ASSERT (mantissa == 0.505);
- }
- for (i = 1, x = 1.01; i >= DBL_MIN_EXP; i--, x *= 0.5)
- {
- int exp = -9999;
- double mantissa = frexp (x, &exp);
- ASSERT (exp == i);
- ASSERT (mantissa == 0.505);
- }
- for (; i >= DBL_MIN_EXP - 100 && x > 0.0; i--, x *= 0.5)
- {
- int exp = -9999;
- double mantissa = frexp (x, &exp);
- ASSERT (exp == i);
- ASSERT (mantissa >= 0.5);
- ASSERT (mantissa < 1.0);
- ASSERT (mantissa == my_ldexp (x, - exp));
- }
-
- for (i = 1, x = 1.73205; i <= DBL_MAX_EXP; i++, x *= 2.0)
- {
- int exp = -9999;
- double mantissa = frexp (x, &exp);
- ASSERT (exp == i);
- ASSERT (mantissa == 0.866025);
- }
- for (i = 1, x = 1.73205; i >= DBL_MIN_EXP; i--, x *= 0.5)
- {
- int exp = -9999;
- double mantissa = frexp (x, &exp);
- ASSERT (exp == i);
- ASSERT (mantissa == 0.866025);
- }
- for (; i >= DBL_MIN_EXP - 100 && x > 0.0; i--, x *= 0.5)
- {
- int exp = -9999;
- double mantissa = frexp (x, &exp);
- ASSERT (exp == i || exp == i + 1);
- ASSERT (mantissa >= 0.5);
- ASSERT (mantissa < 1.0);
- ASSERT (mantissa == my_ldexp (x, - exp));
- }
+ test_function ();
return 0;
}
projects / gnulib.git / blobdiff