Imported Upstream version 0.9.1upstream/0.9.1

1 files changed, 233 insertions, 0 deletions

diff --git a/tests/test-frexpl.c b/tests/test-frexpl.c
new file mode 100644
index 00000000..d4babb88
--- /dev/null
+++ b/tests/test-frexpl.c
@@ -0,0 +1,233 @@
+/* Test of splitting a 'long double' into fraction and mantissa.
+   Copyright (C) 2007-2009 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 <http://www.gnu.org/licenses/>.  */
+
+/* Written by Bruno Haible <bruno@clisp.org>, 2007.  */
+
+#include <config.h>
+
+#include <math.h>
+
+#include <float.h>
+#include <stdio.h>
+#include <stdlib.h>
+
+#include "fpucw.h"
+#include "isnanl-nolibm.h"
+#include "nan.h"
+
+/* Avoid some warnings from "gcc -Wshadow".
+   This file doesn't use the exp() function.  */
+#undef exp
+#define exp exponent
+
+#define ASSERT(expr) \
+  do									     \
+    {									     \
+      if (!(expr))							     \
+        {								     \
+          fprintf (stderr, "%s:%d: assertion failed\n", __FILE__, __LINE__); \
+          fflush (stderr);						     \
+          abort ();							     \
+        }								     \
+    }									     \
+  while (0)
+
+/* 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
+
+/* On HP-UX 10.20, negating 0.0L does not yield -0.0L.
+   So we use minus_zero instead.
+   IRIX cc can't put -0.0L into .data, but can compute at runtime.
+   Note that the expression -LDBL_MIN * LDBL_MIN does not work on other
+   platforms, such as when cross-compiling to PowerPC on MacOS X 10.5.  */
+#if defined __hpux || defined __sgi
+static long double
+compute_minus_zero (void)
+{
+  return -LDBL_MIN * LDBL_MIN;
+}
+# define minus_zero compute_minus_zero ()
+#else
+long double minus_zero = -0.0L;
+#endif
+
+static long double
+my_ldexp (long double x, int d)
+{
+  for (; d > 0; d--)
+    x *= 2.0L;
+  for (; d < 0; d++)
+    x *= 0.5L;
+  return x;
+}
+
+int
+main ()
+{
+  int i;
+  long double x;
+  DECL_LONG_DOUBLE_ROUNDING
+
+  BEGIN_LONG_DOUBLE_ROUNDING ();
+
+  { /* NaN.  */
+    int exp = -9999;
+    long double mantissa;
+    x = NaNl ();
+    mantissa = frexpl (x, &exp);
+    ASSERT (isnanl (mantissa));
+  }
+
+  { /* Positive infinity.  */
+    int exp = -9999;
+    long double mantissa;
+    x = 1.0L / 0.0L;
+    mantissa = frexpl (x, &exp);
+    ASSERT (mantissa == x);
+  }
+
+  { /* Negative infinity.  */
+    int exp = -9999;
+    long double mantissa;
+    x = -1.0L / 0.0L;
+    mantissa = frexpl (x, &exp);
+    ASSERT (mantissa == x);
+  }
+
+  { /* Positive zero.  */
+    int exp = -9999;
+    long double mantissa;
+    x = 0.0L;
+    mantissa = frexpl (x, &exp);
+    ASSERT (exp == 0);
+    ASSERT (mantissa == x);
+    ASSERT (!signbit (mantissa));
+  }
+
+  { /* Negative zero.  */
+    int exp = -9999;
+    long double mantissa;
+    x = minus_zero;
+    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)
+    {
+      int exp = -9999;
+      long double mantissa = frexpl (x, &exp);
+      ASSERT (exp == i);
+      ASSERT (mantissa == 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 >= LDBL_MIN_EXP - 100 && x > 0.0L; 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_MAX_EXP; i++, x *= 2.0L)
+    {
+      int exp = -9999;
+      long double mantissa = frexpl (x, &exp);
+      ASSERT (exp == i);
+      ASSERT (mantissa == -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 >= LDBL_MIN_EXP - 100 && x < 0.0L; i--, x *= 0.5L)
+    {
+      int exp = -9999;
+      long double mantissa = frexpl (x, &exp);
+      ASSERT (exp == i);
+      ASSERT (mantissa == -0.5L);
+    }
+
+  for (i = 1, x = 1.01L; i <= LDBL_MAX_EXP; i++, x *= 2.0L)
+    {
+      int exp = -9999;
+      long double mantissa = frexpl (x, &exp);
+      ASSERT (exp == i);
+      ASSERT (mantissa == 0.505L);
+    }
+  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 == 0.505L);
+    }
+  for (; i >= LDBL_MIN_EXP - 100 && x > 0.0L; i--, x *= 0.5L)
+    {
+      int exp = -9999;
+      long double mantissa = frexpl (x, &exp);
+      ASSERT (exp == i);
+      ASSERT (mantissa >= 0.5L);
+      ASSERT (mantissa < 1.0L);
+      ASSERT (mantissa == my_ldexp (x, - exp));
+    }
+
+  for (i = 1, x = 1.73205L; i <= LDBL_MAX_EXP; i++, x *= 2.0L)
+    {
+      int exp = -9999;
+      long double mantissa = frexpl (x, &exp);
+      ASSERT (exp == i);
+      ASSERT (mantissa == 0.866025L);
+    }
+  for (i = 1, x = 1.73205L; 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 >= LDBL_MIN_EXP - 100 && x > 0.0L; i--, x *= 0.5L)
+    {
+      int exp = -9999;
+      long double mantissa = frexpl (x, &exp);
+      ASSERT (exp == i || exp == i + 1);
+      ASSERT (mantissa >= 0.5L);
+      ASSERT (mantissa < 1.0L);
+      ASSERT (mantissa == my_ldexp (x, - exp));
+    }
+
+  return 0;
+}