X-Git-Url: https://erislabs.net/gitweb/?a=blobdiff_plain;f=tests%2Ftest-truncl.c;h=f8ce551e9c8828ba91e525547169835caf960e29;hb=f6fe750d033c40b403688dc3eee9dbff468aa8f3;hp=dd2a9c1f0b669058337389972d5d7d71b632bed9;hpb=e220635fc952c63b533873f2af39ec76aed4b4e3;p=gnulib.git

diff --git a/tests/test-truncl.c b/tests/test-truncl.c
index dd2a9c1f0..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									     \
@@ -38,6 +40,22 @@
     }									     \
   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 ()
 {
@@ -47,7 +65,7 @@ main ()
 
   /* Zero.  */
   ASSERT (truncl (0.0L) == 0.0L);
-  ASSERT (truncl (-0.0L) == 0.0L);
+  ASSERT (truncl (minus_zero) == 0.0L);
   /* Positive numbers.  */
   ASSERT (truncl (0.3L) == 0.0L);
   ASSERT (truncl (0.7L) == 0.0L);
@@ -72,7 +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;
 }