Add isnan module.

1 files changed, 228 insertions, 0 deletions

diff --git a/tests/test-isnan.c b/tests/test-isnan.c
new file mode 100644
index 0000000000..9761ee662f
--- /dev/null
+++ b/tests/test-isnan.c
@@ -0,0 +1,228 @@
+/* Test of isnand() substitute.
+   Copyright (C) 2007-2008 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 <blp@cs.stanford.edu>, from code by Bruno
+   Haible <bruno@clisp.org>.  */
+
+#include <config.h>
+
+#include <math.h>
+
+#include <float.h>
+#include <limits.h>
+#include <stdio.h>
+#include <stdlib.h>
+
+#include "nan.h"
+
+#define ASSERT(expr) \
+  do									     \
+    {									     \
+      if (!(expr))							     \
+        {								     \
+          fprintf (stderr, "%s:%d: assertion failed\n", __FILE__, __LINE__); \
+          fflush (stderr);						     \
+          abort ();							     \
+        }								     \
+    }									     \
+  while (0)
+
+static void
+test_float (void)
+{
+  /* Finite values.  */
+  ASSERT (!isnan (3.141f));
+  ASSERT (!isnan (3.141e30f));
+  ASSERT (!isnan (3.141e-30f));
+  ASSERT (!isnan (-2.718f));
+  ASSERT (!isnan (-2.718e30f));
+  ASSERT (!isnan (-2.718e-30f));
+  ASSERT (!isnan (0.0f));
+  ASSERT (!isnan (-0.0f));
+  /* Infinite values.  */
+  ASSERT (!isnan (1.0f / 0.0f));
+  ASSERT (!isnan (-1.0f / 0.0f));
+  /* Quiet NaN.  */
+  ASSERT (isnan (NaNf ()));
+#if defined FLT_EXPBIT0_WORD && defined FLT_EXPBIT0_BIT
+  /* Signalling NaN.  */
+  {
+    #define NWORDSF \
+      ((sizeof (float) + sizeof (unsigned int) - 1) / sizeof (unsigned int))
+    typedef union { float value; unsigned int word[NWORDSF]; } memory_float;
+    memory_float m;
+    m.value = NaNf ();
+# 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 < NWORDSF / 2 ? 1 : - 1)]
+      ^= (unsigned int) 1 << (sizeof (unsigned int) * CHAR_BIT - 1);
+# endif
+    if (FLT_EXPBIT0_WORD < NWORDSF / 2)
+      m.word[FLT_EXPBIT0_WORD + 1] |= (unsigned int) 1 << FLT_EXPBIT0_BIT;
+    else
+      m.word[0] |= (unsigned int) 1;
+    ASSERT (isnan (m.value));
+  }
+#endif
+}
+
+static void
+test_double (void)
+{
+  /* Finite values.  */
+  ASSERT (!isnan (3.141));
+  ASSERT (!isnan (3.141e30));
+  ASSERT (!isnan (3.141e-30));
+  ASSERT (!isnan (-2.718));
+  ASSERT (!isnan (-2.718e30));
+  ASSERT (!isnan (-2.718e-30));
+  ASSERT (!isnan (0.0));
+  ASSERT (!isnan (-0.0));
+  /* Infinite values.  */
+  ASSERT (!isnan (1.0 / 0.0));
+  ASSERT (!isnan (-1.0 / 0.0));
+  /* Quiet NaN.  */
+  ASSERT (isnan (NaNd ()));
+#if defined DBL_EXPBIT0_WORD && defined DBL_EXPBIT0_BIT
+  /* Signalling NaN.  */
+  {
+    #define NWORDSD \
+      ((sizeof (double) + sizeof (unsigned int) - 1) / sizeof (unsigned int))
+    typedef union { double value; unsigned int word[NWORDSD]; } memory_double;
+    memory_double m;
+    m.value = NaNd ();
+# 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 < NWORDSD / 2 ? 1 : - 1)]
+      ^= (unsigned int) 1 << (sizeof (unsigned int) * CHAR_BIT - 1);
+# endif
+    m.word[DBL_EXPBIT0_WORD + (DBL_EXPBIT0_WORD < NWORDSD / 2 ? 1 : - 1)]
+      |= (unsigned int) 1 << DBL_EXPBIT0_BIT;
+    ASSERT (isnan (m.value));
+  }
+#endif
+}
+
+static void
+test_long_double (void)
+{
+  #define NWORDSL \
+    ((sizeof (long double) + sizeof (unsigned int) - 1) / sizeof (unsigned int))
+  typedef union { unsigned int word[NWORDSL]; long double value; }
+          memory_long_double;
+
+  /* Finite values.  */
+  ASSERT (!isnan (3.141L));
+  ASSERT (!isnan (3.141e30L));
+  ASSERT (!isnan (3.141e-30L));
+  ASSERT (!isnan (-2.718L));
+  ASSERT (!isnan (-2.718e30L));
+  ASSERT (!isnan (-2.718e-30L));
+  ASSERT (!isnan (0.0L));
+  ASSERT (!isnan (-0.0L));
+  /* Infinite values.  */
+  ASSERT (!isnan (1.0L / 0.0L));
+  ASSERT (!isnan (-1.0L / 0.0L));
+  /* Quiet NaN.  */
+  ASSERT (isnan (0.0L / 0.0L));
+
+#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.  */
+  {
+    memory_long_double m;
+    m.value = 0.0L / 0.0L;
+# 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 < NWORDSL / 2 ? 1 : - 1)]
+      ^= (unsigned int) 1 << (sizeof (unsigned int) * CHAR_BIT - 1);
+# endif
+    m.word[LDBL_EXPBIT0_WORD + (LDBL_EXPBIT0_WORD < NWORDSL / 2 ? 1 : - 1)]
+      |= (unsigned int) 1 << LDBL_EXPBIT0_BIT;
+    ASSERT (isnan (m.value));
+  }
+#endif
+
+#if ((defined __ia64 && LDBL_MANT_DIG == 64) || (defined __x86_64__ || defined __amd64__) || (defined __i386 || defined __i386__ || defined _I386 || defined _M_IX86 || defined _X86_))
+/* Representation of an 80-bit 'long double' as an initializer for a sequence
+   of 'unsigned int' words.  */
+# ifdef WORDS_BIGENDIAN
+#  define LDBL80_WORDS(exponent,manthi,mantlo) \
+     { ((unsigned int) (exponent) << 16) | ((unsigned int) (manthi) >> 16), \
+       ((unsigned int) (manthi) << 16) | (unsigned int) (mantlo) >> 16),    \
+       (unsigned int) (mantlo) << 16                                        \
+     }
+# else
+#  define LDBL80_WORDS(exponent,manthi,mantlo) \
+     { mantlo, manthi, exponent }
+# endif
+  { /* Quiet NaN.  */
+    static memory_long_double x =
+      { LDBL80_WORDS (0xFFFF, 0xC3333333, 0x00000000) };
+    ASSERT (isnan (x.value));
+  }
+  {
+    /* Signalling NaN.  */
+    static memory_long_double x =
+      { LDBL80_WORDS (0xFFFF, 0x83333333, 0x00000000) };
+    ASSERT (isnan (x.value));
+  }
+  /* The isnan function should recognize Pseudo-NaNs, Pseudo-Infinities,
+     Pseudo-Zeroes, Unnormalized Numbers, and Pseudo-Denormals, as defined in
+       Intel IA-64 Architecture Software Developer's Manual, Volume 1:
+       Application Architecture.
+       Table 5-2 "Floating-Point Register Encodings"
+       Figure 5-6 "Memory to Floating-Point Register Data Translation"
+   */
+  { /* Pseudo-NaN.  */
+    static memory_long_double x =
+      { LDBL80_WORDS (0xFFFF, 0x40000001, 0x00000000) };
+    ASSERT (isnan (x.value));
+  }
+  { /* Pseudo-Infinity.  */
+    static memory_long_double x =
+      { LDBL80_WORDS (0xFFFF, 0x00000000, 0x00000000) };
+    ASSERT (isnan (x.value));
+  }
+  { /* Pseudo-Zero.  */
+    static memory_long_double x =
+      { LDBL80_WORDS (0x4004, 0x00000000, 0x00000000) };
+    ASSERT (isnan (x.value));
+  }
+  { /* Unnormalized number.  */
+    static memory_long_double x =
+      { LDBL80_WORDS (0x4000, 0x63333333, 0x00000000) };
+    ASSERT (isnan (x.value));
+  }
+  { /* Pseudo-Denormal.  */
+    static memory_long_double x =
+      { LDBL80_WORDS (0x0000, 0x83333333, 0x00000000) };
+    ASSERT (isnan (x.value));
+  }
+#endif
+}
+
+int
+main ()
+{
+  test_float ();
+  test_double ();
+  test_long_double ();
+  return 0;
+}