git-version-gen: correct the advice in a comment

[gnulib.git] / tests / test-truncl-ieee.c

diff --git a/tests/test-truncl-ieee.c b/tests/test-truncl-ieee.c
index de6c9ad..9b73a1c 100644 (file)
--- a/tests/test-truncl-ieee.c
+++ b/tests/test-truncl-ieee.c
@@ -1,5 +1,5 @@
 /* Test of rounding towards zero.
-   Copyright (C) 2010 Free Software Foundation, Inc.
+   Copyright (C) 2010-2011 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
@@ -29,9 +29,20 @@ main ()
 
   BEGIN_LONG_DOUBLE_ROUNDING ();
 
+  /* 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 (truncl (0.0L)));
   ASSERT (!!signbit (truncl (minus_zerol)) == !!signbit (minus_zerol));
+  /* Positive numbers.  */
+  ASSERT (!signbit (truncl (0.3L)));
+  ASSERT (!signbit (truncl (0.7L)));
+  /* Negative numbers.  */
+  ASSERT (!!signbit (truncl (-0.3L)) == !!signbit (minus_zerol));
+  ASSERT (!!signbit (truncl (-0.7L)) == !!signbit (minus_zerol));
 
   return 0;
 }