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-rw-r--r--tests/test-signbit.c204
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diff --git a/tests/test-signbit.c b/tests/test-signbit.c
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+/* Test of signbit() substitute.
+ Copyright (C) 2007, 2008, 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 <limits.h>
+#include <stdio.h>
+#include <stdlib.h>
+
+#define ASSERT(expr) \
+ do \
+ { \
+ if (!(expr)) \
+ { \
+ fprintf (stderr, "%s:%d: assertion failed\n", __FILE__, __LINE__); \
+ fflush (stderr); \
+ abort (); \
+ } \
+ } \
+ while (0)
+
+float zerof = 0.0f;
+double zerod = 0.0;
+long double zerol = 0.0L;
+
+/* HP cc on HP-UX 10.20 has a bug with the constant expression -0.0f.
+ So we use -zerof instead. */
+
+/* HP cc on HP-UX 10.20 has a bug with the constant expression -0.0.
+ So we use -zerod instead. */
+
+/* On HP-UX 10.20, negating 0.0L does not yield -0.0L.
+ So we use minus_zerol 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_zerol (void)
+{
+ return -LDBL_MIN * LDBL_MIN;
+}
+# define minus_zerol compute_minus_zerol ()
+#else
+long double minus_zerol = -0.0L;
+#endif
+
+static void
+test_signbitf ()
+{
+ /* Finite values. */
+ ASSERT (!signbit (3.141f));
+ ASSERT (!signbit (3.141e30f));
+ ASSERT (!signbit (3.141e-30f));
+ ASSERT (signbit (-2.718f));
+ ASSERT (signbit (-2.718e30f));
+ ASSERT (signbit (-2.718e-30f));
+ /* Zeros. */
+ ASSERT (!signbit (0.0f));
+ if (1.0f / -zerof < 0)
+ ASSERT (signbit (-zerof));
+ else
+ ASSERT (!signbit (-zerof));
+ /* Infinite values. */
+ ASSERT (!signbit (1.0f / 0.0f));
+ ASSERT (signbit (-1.0f / 0.0f));
+ /* Quiet NaN. */
+ (void) signbit (zerof / zerof);
+#if defined FLT_EXPBIT0_WORD && defined FLT_EXPBIT0_BIT
+ /* Signalling NaN. */
+ {
+ #define NWORDS \
+ ((sizeof (float) + sizeof (unsigned int) - 1) / sizeof (unsigned int))
+ typedef union { float value; unsigned int word[NWORDS]; } memory_float;
+ memory_float m;
+ m.value = zerof / zerof;
+# if FLT_EXPBIT0_BIT > 0
+ m.word[FLT_EXPBIT0_WORD] ^= (unsigned int) 1 << (FLT_EXPBIT0_BIT - 1);
+# else
+ m.word[FLT_EXPBIT0_WORD + (FLT_EXPBIT0_WORD < NWORDS / 2 ? 1 : - 1)]
+ ^= (unsigned int) 1 << (sizeof (unsigned int) * CHAR_BIT - 1);
+# endif
+ if (FLT_EXPBIT0_WORD < NWORDS / 2)
+ m.word[FLT_EXPBIT0_WORD + 1] |= (unsigned int) 1 << FLT_EXPBIT0_BIT;
+ else
+ m.word[0] |= (unsigned int) 1;
+ (void) signbit (m.value);
+ #undef NWORDS
+ }
+#endif
+}
+
+static void
+test_signbitd ()
+{
+ /* Finite values. */
+ ASSERT (!signbit (3.141));
+ ASSERT (!signbit (3.141e30));
+ ASSERT (!signbit (3.141e-30));
+ ASSERT (signbit (-2.718));
+ ASSERT (signbit (-2.718e30));
+ ASSERT (signbit (-2.718e-30));
+ /* Zeros. */
+ ASSERT (!signbit (0.0));
+ if (1.0 / -zerod < 0)
+ ASSERT (signbit (-zerod));
+ else
+ ASSERT (!signbit (-zerod));
+ /* Infinite values. */
+ ASSERT (!signbit (1.0 / 0.0));
+ ASSERT (signbit (-1.0 / 0.0));
+ /* Quiet NaN. */
+ (void) signbit (zerod / zerod);
+#if defined DBL_EXPBIT0_WORD && defined DBL_EXPBIT0_BIT
+ /* Signalling NaN. */
+ {
+ #define NWORDS \
+ ((sizeof (double) + sizeof (unsigned int) - 1) / sizeof (unsigned int))
+ typedef union { double value; unsigned int word[NWORDS]; } memory_double;
+ memory_double m;
+ m.value = zerod / zerod;
+# if DBL_EXPBIT0_BIT > 0
+ m.word[DBL_EXPBIT0_WORD] ^= (unsigned int) 1 << (DBL_EXPBIT0_BIT - 1);
+# else
+ m.word[DBL_EXPBIT0_WORD + (DBL_EXPBIT0_WORD < NWORDS / 2 ? 1 : - 1)]
+ ^= (unsigned int) 1 << (sizeof (unsigned int) * CHAR_BIT - 1);
+# endif
+ m.word[DBL_EXPBIT0_WORD + (DBL_EXPBIT0_WORD < NWORDS / 2 ? 1 : - 1)]
+ |= (unsigned int) 1 << DBL_EXPBIT0_BIT;
+ (void) signbit (m.value);
+ #undef NWORDS
+ }
+#endif
+}
+
+static void
+test_signbitl ()
+{
+ /* Finite values. */
+ ASSERT (!signbit (3.141L));
+ ASSERT (!signbit (3.141e30L));
+ ASSERT (!signbit (3.141e-30L));
+ ASSERT (signbit (-2.718L));
+ ASSERT (signbit (-2.718e30L));
+ ASSERT (signbit (-2.718e-30L));
+ /* Zeros. */
+ ASSERT (!signbit (0.0L));
+ if (1.0L / minus_zerol < 0)
+ ASSERT (signbit (minus_zerol));
+ else
+ ASSERT (!signbit (minus_zerol));
+ /* Infinite values. */
+ ASSERT (!signbit (1.0L / 0.0L));
+ ASSERT (signbit (-1.0L / 0.0L));
+ /* Quiet NaN. */
+ (void) signbit (zerol / zerol);
+#if defined LDBL_EXPBIT0_WORD && defined LDBL_EXPBIT0_BIT
+ /* Signalling NaN. */
+ {
+ #define NWORDS \
+ ((sizeof (long double) + sizeof (unsigned int) - 1) / sizeof (unsigned int))
+ typedef union { long double value; unsigned int word[NWORDS]; } memory_long_double;
+ memory_long_double m;
+ m.value = zerol / zerol;
+# if LDBL_EXPBIT0_BIT > 0
+ m.word[LDBL_EXPBIT0_WORD] ^= (unsigned int) 1 << (LDBL_EXPBIT0_BIT - 1);
+# else
+ m.word[LDBL_EXPBIT0_WORD + (LDBL_EXPBIT0_WORD < NWORDS / 2 ? 1 : - 1)]
+ ^= (unsigned int) 1 << (sizeof (unsigned int) * CHAR_BIT - 1);
+# endif
+ m.word[LDBL_EXPBIT0_WORD + (LDBL_EXPBIT0_WORD < NWORDS / 2 ? 1 : - 1)]
+ |= (unsigned int) 1 << LDBL_EXPBIT0_BIT;
+ (void) signbit (m.value);
+ #undef NWORDS
+ }
+#endif
+}
+
+int
+main ()
+{
+ test_signbitf ();
+ test_signbitd ();
+ test_signbitl ();
+ return 0;
+}