obtained gcc-4.6.4.tar.bz2 from upstream website;upstream

verified gcc-4.6.4.tar.bz2.sig;
imported gcc-4.6.4 source tree from verified upstream tarball.

downloading a git-generated archive based on the 'upstream' tag
should provide you with a source tree that is binary identical
to the one extracted from the above tarball.

if you have obtained the source via the command 'git clone',
however, do note that line-endings of files in your working
directory might differ from line-endings of the respective
files in the upstream repository.

1 files changed, 29 insertions, 0 deletions

diff --git a/gcc/testsuite/gcc.c-torture/execute/ieee/mzero5.c b/gcc/testsuite/gcc.c-torture/execute/ieee/mzero5.c
new file mode 100644
index 000000000..3804c08a8
--- /dev/null
+++ b/gcc/testsuite/gcc.c-torture/execute/ieee/mzero5.c
@@ -0,0 +1,29 @@
+/* Test gcse handling of IEEE 0/-0 rules.  */
+static double zero = 0.0;
+
+int
+negzero_check (double d)
+{
+  if (d == 0)
+    return !!memcmp ((void *)&zero, (void *)&d, sizeof (double));
+  return 0;
+}
+
+int
+sub (double d, double e)
+{
+  if (d == 0.0 && e == 0.0
+      && negzero_check (d) == 0 && negzero_check (e) == 0)
+    return 1;
+  else
+    return 0;
+}
+
+int
+main (void)
+{
+  double minus_zero = -0.0;
+  if (sub (minus_zero, 0))
+    abort ();
+  return 0;
+}