X-Git-Url: https://erislabs.net/gitweb/?a=blobdiff_plain;f=tests%2Ftest-trunc-ieee.c;h=8127031efda52b1ef6971d94734ded0602a947d9;hb=5068051817bc09c088f31d3627956bfe5086b130;hp=c0fc0f262bfb62c0668b89d3d849354480561304;hpb=0c5e7922f80eae16b5a89233d5a8c0d1f88c18a7;p=gnulib.git

diff --git a/tests/test-trunc-ieee.c b/tests/test-trunc-ieee.c
index c0fc0f262..8127031ef 100644
--- a/tests/test-trunc-ieee.c
+++ b/tests/test-trunc-ieee.c
@@ -1,5 +1,5 @@
 /* Test of rounding towards zero.
-   Copyright (C) 2010 Free Software Foundation, Inc.
+   Copyright (C) 2010-2013 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
@@ -18,15 +18,37 @@
 
 #include <math.h>
 
+#include "isnand-nolibm.h"
 #include "minus-zero.h"
+#include "infinity.h"
+#include "nan.h"
 #include "macros.h"
 
 int
 main ()
 {
+  /* See IEEE 754, section 6.3:
+       "the sign of the result of the round floating-point number to
+        integral value operation is the sign of the operand. These rules
+        shall apply even when operands or results are zero or infinite."  */
+
   /* Zero.  */
   ASSERT (!signbit (trunc (0.0)));
   ASSERT (!!signbit (trunc (minus_zerod)) == !!signbit (minus_zerod));
+  /* Positive numbers.  */
+  ASSERT (!signbit (trunc (0.3)));
+  ASSERT (!signbit (trunc (0.7)));
+  /* Negative numbers.  */
+  ASSERT (!!signbit (trunc (-0.3)) == !!signbit (minus_zerod));
+  ASSERT (!!signbit (trunc (-0.7)) == !!signbit (minus_zerod));
+
+  /* [MX] shaded specification in POSIX.  */
+
+  /* NaN.  */
+  ASSERT (isnand (trunc (NaNd ())));
+  /* Infinity.  */
+  ASSERT (trunc (Infinityd ()) == Infinityd ());
+  ASSERT (trunc (- Infinityd ()) == - Infinityd ());
 
   return 0;
 }