NEWS.stable: log cherry-pick [a0d9972]->[21d1619] freopen: Don't crash if the filenam...

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

diff --git a/tests/test-round-ieee.c b/tests/test-round-ieee.c
index 0d5ad86..1408d6a 100644 (file)
--- a/tests/test-round-ieee.c
+++ b/tests/test-round-ieee.c
@@ -1,5 +1,5 @@
 /* Test of rounding to nearest, breaking ties away from 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
@@ -25,9 +25,20 @@
 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 (round (0.0)));
   ASSERT (!!signbit (round (minus_zerod)) == !!signbit (minus_zerod));
+  /* Positive numbers.  */
+  ASSERT (!signbit (round (0.3)));
+  ASSERT (!signbit (round (0.7)));
+  /* Negative numbers.  */
+  ASSERT (!!signbit (round (-0.3)) == !!signbit (minus_zerod));
+  ASSERT (!!signbit (round (-0.7)) == !!signbit (minus_zerod));
 
   return 0;
 }