X-Git-Url: http://erislabs.net/gitweb/?a=blobdiff_plain;f=tests%2Ftest-truncl.c;h=f8ce551e9c8828ba91e525547169835caf960e29;hb=1697fcca5dcb036ef6647969cbbaad907d16479c;hp=3ea856a994cfb91aaecc8aed320249447ce22700;hpb=4eb59b32a2a687c113f3c0dfc166fc2573acb84f;p=gnulib.git

diff --git a/tests/test-truncl.c b/tests/test-truncl.c
index 3ea856a99..f8ce551e9 100644
--- a/tests/test-truncl.c
+++ b/tests/test-truncl.c
@@ -1,5 +1,5 @@
 /* Test of rounding towards zero.
-   Copyright (C) 2007-2008 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
@@ -20,11 +20,13 @@
 
 #include <math.h>
 
+#include <float.h>
 #include <stdio.h>
 #include <stdlib.h>
 
 #include "fpucw.h"
 #include "isnanl-nolibm.h"
+#include "nan.h"
 
 #define ASSERT(expr) \
   do									     \
@@ -38,9 +40,21 @@
     }									     \
   while (0)
 
-/* HP cc on HP-UX 10.20 has a bug with the constant expression -0.0L.
-   So we use -zero instead.  */
-long double zero = 0.0L;
+/* 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 ()
@@ -51,7 +65,7 @@ main ()
 
   /* Zero.  */
   ASSERT (truncl (0.0L) == 0.0L);
-  ASSERT (truncl (-zero) == 0.0L);
+  ASSERT (truncl (minus_zero) == 0.0L);
   /* Positive numbers.  */
   ASSERT (truncl (0.3L) == 0.0L);
   ASSERT (truncl (0.7L) == 0.0L);
@@ -76,7 +90,7 @@ main ()
   ASSERT (truncl (1.0L / 0.0L) == 1.0L / 0.0L);
   ASSERT (truncl (-1.0L / 0.0L) == -1.0L / 0.0L);
   /* NaNs.  */
-  ASSERT (isnanl (truncl (0.0L / 0.0L)));
+  ASSERT (isnanl (truncl (NaNl ())));
 
   return 0;
 }