X-Git-Url: http://erislabs.net/gitweb/?a=blobdiff_plain;f=tests%2Ftest-floor-ieee.c;h=d7671a1c095a17d2423819ed28f53f1419a4327b;hb=2949b7fd942e2dc3470dfcc42fd6b77e6b27418a;hp=0051d67f2507f2ddecedab870d08acef082cbf40;hpb=8938f22cb374f04f265ac3a9d2cefdc44524d6e2;p=gnulib.git

diff --git a/tests/test-floor-ieee.c b/tests/test-floor-ieee.c
index 0051d67f2..d7671a1c0 100644
--- a/tests/test-floor-ieee.c
+++ b/tests/test-floor-ieee.c
@@ -1,5 +1,5 @@
 /* Test of rounding towards negative infinity.
-   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
@@ -24,9 +24,20 @@
 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 (floor (0.0)));
   ASSERT (!!signbit (floor (minus_zerod)) == !!signbit (minus_zerod));
+  /* Positive numbers.  */
+  ASSERT (!signbit (floor (0.3)));
+  ASSERT (!signbit (floor (0.7)));
+  /* Negative numbers.  */
+  ASSERT (!!signbit (floor (-0.3)) == !!signbit (minus_zerod));
+  ASSERT (!!signbit (floor (-0.7)) == !!signbit (minus_zerod));
 
   return 0;
 }