argp-version-etc: new module.

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

diff --git a/tests/test-ldexpl.c b/tests/test-ldexpl.c
index 4740631..5f1fbd9 100644 (file)
--- a/tests/test-ldexpl.c
+++ b/tests/test-ldexpl.c
@@ -1,5 +1,5 @@
 /* Test of multiplying a 'long double' by a power of 2.
-   Copyright (C) 2007 Free Software Foundation, Inc.
+   Copyright (C) 2007-2009 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
@@ -26,6 +26,7 @@
 
 #include "fpucw.h"
 #include "isnanl-nolibm.h"
+#include "nan.h"
 
 #define ASSERT(expr) \
   do                                                                        \
@@ -33,11 +34,28 @@
       if (!(expr))                                                          \
         {                                                                   \
           fprintf (stderr, "%s:%d: assertion failed\n", __FILE__, __LINE__); \
+          fflush (stderr);                                                  \
           abort ();                                                         \
         }                                                                   \
     }                                                                       \
   while (0)
 
+/* On HP-UX 10.20, negating 0.0L does not yield -0.0L.
+   So we use minus_zero 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_zero (void)
+{
+  return -LDBL_MIN * LDBL_MIN;
+}
+# define minus_zero compute_minus_zero ()
+#else
+long double minus_zero = -0.0L;
+#endif
+
 int
 main ()
 {
@@ -49,7 +67,7 @@ main ()
   BEGIN_LONG_DOUBLE_ROUNDING ();
 
   { /* NaN.  */
-    x = 0.0L / 0.0L;
+    x = NaNl ();
     y = ldexpl (x, 0); ASSERT (isnanl (y));
     y = ldexpl (x, 5); ASSERT (isnanl (y));
     y = ldexpl (x, -5); ASSERT (isnanl (y));
@@ -77,7 +95,7 @@ main ()
   }
 
   { /* Negative zero.  */
-    x = -0.0L;
+    x = minus_zero;
     y = ldexpl (x, 0); ASSERT (y == x); ASSERT (signbit (x));
     y = ldexpl (x, 5); ASSERT (y == x); ASSERT (signbit (x));
     y = ldexpl (x, -5); ASSERT (y == x); ASSERT (signbit (x));