--- /dev/null
+/* Test of isfinite() substitute.
+ Copyright (C) 2007 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 Ben Pfaff, 2007, using Bruno Haible's code as a
+ template. */
+
+#include <config.h>
+
+#include <float.h>
+#include <limits.h>
+#include <math.h>
+
+#include <stdio.h>
+#include <stdlib.h>
+
+#define ASSERT(expr) \
+ do \
+ { \
+ if (!(expr)) \
+ { \
+ fprintf (stderr, "%s:%d: assertion failed\n", __FILE__, __LINE__); \
+ abort (); \
+ } \
+ } \
+ while (0)
+
+float zerof = 0.0f;
+double zerod = 0.0;
+long double zerol = 0.0L;
+
+static void
+test_isfinitef ()
+{
+ /* Zero. */
+ ASSERT (isfinite (0.0f));
+ /* Subnormal values. */
+ ASSERT (isfinite (FLT_MIN / 2));
+ ASSERT (isfinite (-FLT_MIN / 2));
+ /* Finite values. */
+ ASSERT (isfinite (3.141f));
+ ASSERT (isfinite (3.141e30f));
+ ASSERT (isfinite (3.141e-30f));
+ ASSERT (isfinite (-2.718f));
+ ASSERT (isfinite (-2.718e30f));
+ ASSERT (isfinite (-2.718e-30f));
+ /* Infinite values. */
+ ASSERT (!isfinite (1.0f / 0.0f));
+ ASSERT (!isfinite (-1.0f / 0.0f));
+ /* Quiet NaN. */
+ ASSERT (!isfinite (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;
+ ASSERT (!isfinite (m.value));
+ #undef NWORDS
+ }
+#endif
+}
+
+static void
+test_isfinited ()
+{
+ /* Zero. */
+ ASSERT (isfinite (0.0));
+ /* Subnormal values. */
+ ASSERT (isfinite (DBL_MIN / 2));
+ ASSERT (isfinite (-DBL_MIN / 2));
+ /* Finite values. */
+ ASSERT (isfinite (3.141));
+ ASSERT (isfinite (3.141e30));
+ ASSERT (isfinite (3.141e-30));
+ ASSERT (isfinite (-2.718));
+ ASSERT (isfinite (-2.718e30));
+ ASSERT (isfinite (-2.718e-30));
+ /* Infinite values. */
+ ASSERT (!isfinite (1.0 / 0.0));
+ ASSERT (!isfinite (-1.0 / 0.0));
+ /* Quiet NaN. */
+ ASSERT (!isfinite (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;
+ ASSERT (!isfinite (m.value));
+ #undef NWORDS
+ }
+#endif
+}
+
+static void
+test_isfinitel ()
+{
+ /* Zero. */
+ ASSERT (isfinite (0.0L));
+ /* Subnormal values. */
+ ASSERT (isfinite (LDBL_MIN / 2));
+ ASSERT (isfinite (-LDBL_MIN / 2));
+ /* Finite values. */
+ ASSERT (isfinite (3.141L));
+ ASSERT (isfinite (3.141e30L));
+ ASSERT (isfinite (3.141e-30L));
+ ASSERT (isfinite (-2.718L));
+ ASSERT (isfinite (-2.718e30L));
+ ASSERT (isfinite (-2.718e-30L));
+ /* Infinite values. */
+ ASSERT (!isfinite (1.0L / 0.0L));
+ ASSERT (!isfinite (-1.0L / 0.0L));
+ /* Quiet NaN. */
+ ASSERT (!isfinite (zerol / zerol));
+#if defined LDBL_EXPBIT0_WORD && defined LDBL_EXPBIT0_BIT
+ /* A bit pattern that is different from a Quiet NaN. With a bit of luck,
+ it's a Signalling NaN. */
+ {
+ #define NWORDS \
+ ((sizeof (long double) + sizeof (unsigned int) - 1) / sizeof (unsigned int))
+ typedef union { unsigned int word[NWORDS]; long double value; }
+ 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;
+ ASSERT (!isfinite (m.value));
+ #undef NWORDS
+ }
+#endif
+}
+
+int
+main ()
+{
+ test_isfinitef ();
+ test_isfinited ();
+ test_isfinitel ();
+ return 0;
+}
projects / gnulib.git / blobdiff