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authorBen Pfaff <blp@cs.stanford.edu>2008-07-12 10:50:41 -0700
committerBen Pfaff <blp@cs.stanford.edu>2008-07-12 11:27:15 -0700
commit7080851f5a8270aee50e8545d28c48c6c75decc1 (patch)
tree453a13b78a8c62e4165a1b15d8017af233454616 /tests/test-isnan.c
parent4ade019ba68356b5d58a94dccff159a1fde85ad5 (diff)
downloadgnulib-7080851f5a8270aee50e8545d28c48c6c75decc1.tar.gz
Add isnan module.
Diffstat (limited to 'tests/test-isnan.c')
-rw-r--r--tests/test-isnan.c228
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
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+++ b/tests/test-isnan.c
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+/* 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;
+}