link: Update documentation.

[gnulib.git] / tests / test-isnan.c

diff --git a/tests/test-isnan.c b/tests/test-isnan.c
index 9761ee6..d1d05dc 100644 (file)
--- a/tests/test-isnan.c
+++ b/tests/test-isnan.c
@@ -1,5 +1,5 @@
 /* Test of isnand() substitute.
-   Copyright (C) 2007-2008 Free Software Foundation, Inc.
+   Copyright (C) 2007-2010 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
@@ -21,24 +21,40 @@
 
 #include <math.h>
 
+/* isnan must be a macro.  */
+#ifndef isnan
+# error missing declaration
+#endif
+
 #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)
+#include "macros.h"
+
+/* HP cc on HP-UX 10.20 has a bug with the constant expression -0.0f.
+   So we use -zero instead.  */
+float zerof = 0.0f;
+
+/* HP cc on HP-UX 10.20 has a bug with the constant expression -0.0.
+   So we use -zero instead.  */
+double zerod = 0.0;
+
+/* 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_float (void)
@@ -51,7 +67,7 @@ test_float (void)
   ASSERT (!isnan (-2.718e30f));
   ASSERT (!isnan (-2.718e-30f));
   ASSERT (!isnan (0.0f));
-  ASSERT (!isnan (-0.0f));
+  ASSERT (!isnan (-zerof));
   /* Infinite values.  */
   ASSERT (!isnan (1.0f / 0.0f));
   ASSERT (!isnan (-1.0f / 0.0f));
@@ -91,7 +107,7 @@ test_double (void)
   ASSERT (!isnan (-2.718e30));
   ASSERT (!isnan (-2.718e-30));
   ASSERT (!isnan (0.0));
-  ASSERT (!isnan (-0.0));
+  ASSERT (!isnan (-zerod));
   /* Infinite values.  */
   ASSERT (!isnan (1.0 / 0.0));
   ASSERT (!isnan (-1.0 / 0.0));
@@ -134,19 +150,19 @@ test_long_double (void)
   ASSERT (!isnan (-2.718e30L));
   ASSERT (!isnan (-2.718e-30L));
   ASSERT (!isnan (0.0L));
-  ASSERT (!isnan (-0.0L));
+  ASSERT (!isnan (minus_zerol));
   /* Infinite values.  */
   ASSERT (!isnan (1.0L / 0.0L));
   ASSERT (!isnan (-1.0L / 0.0L));
   /* Quiet NaN.  */
-  ASSERT (isnan (0.0L / 0.0L));
+  ASSERT (isnan (NaNl ()));
 
 #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;
+    m.value = NaNl ();
 # if LDBL_EXPBIT0_BIT > 0
     m.word[LDBL_EXPBIT0_WORD] ^= (unsigned int) 1 << (LDBL_EXPBIT0_BIT - 1);
 # else