Comment.

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

diff --git a/tests/test-signbit.c b/tests/test-signbit.c
index 1d1a2a8..94cab37 100644 (file)
--- a/tests/test-signbit.c
+++ b/tests/test-signbit.c
@@ -20,6 +20,7 @@
 
 #include <math.h>
 
+#include <float.h>
 #include <limits.h>
 #include <stdio.h>
 #include <stdlib.h>
@@ -40,6 +41,16 @@ float zerof = 0.0f;
 double zerod = 0.0;
 long double zerol = 0.0L;
 
+/* HP cc on HP-UX 10.20 has a bug with the constant expression -0.0f.
+   So we use -zerof instead.  */
+
+/* HP cc on HP-UX 10.20 has a bug with the constant expression -0.0.
+   So we use -zerod instead.  */
+
+/* On HP-UX 10.20, negating 0.0L does not yield -0.0L.
+   So we use minus_zerol instead.  */
+long double minus_zerol = -LDBL_MIN * LDBL_MIN;
+
 static void
 test_signbitf ()
 {
@@ -53,9 +64,9 @@ test_signbitf ()
   /* Zeros.  */
   ASSERT (!signbit (0.0f));
   if (1.0f / -zerof < 0)
-    ASSERT (signbit (-0.0f));
+    ASSERT (signbit (-zerof));
   else
-    ASSERT (!signbit (-0.0f));
+    ASSERT (!signbit (-zerof));
   /* Infinite values.  */
   ASSERT (!signbit (1.0f / 0.0f));
   ASSERT (signbit (-1.0f / 0.0f));
@@ -98,9 +109,9 @@ test_signbitd ()
   /* Zeros.  */
   ASSERT (!signbit (0.0));
   if (1.0 / -zerod < 0)
-    ASSERT (signbit (-0.0));
+    ASSERT (signbit (-zerod));
   else
-    ASSERT (!signbit (-0.0));
+    ASSERT (!signbit (-zerod));
   /* Infinite values.  */
   ASSERT (!signbit (1.0 / 0.0));
   ASSERT (signbit (-1.0 / 0.0));
@@ -140,10 +151,10 @@ test_signbitl ()
   ASSERT (signbit (-2.718e-30L));
   /* Zeros.  */
   ASSERT (!signbit (0.0L));
-  if (1.0L / -zerol < 0)
-    ASSERT (signbit (-0.0L));
+  if (1.0L / minus_zerol < 0)
+    ASSERT (signbit (minus_zerol));
   else
-    ASSERT (!signbit (-0.0L));
+    ASSERT (!signbit (minus_zerol));
   /* Infinite values.  */
   ASSERT (!signbit (1.0L / 0.0L));
   ASSERT (signbit (-1.0L / 0.0L));