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, 52 insertions, 0 deletions

diff --git a/gcc/testsuite/g++.dg/tree-ssa/dom-invalid.C b/gcc/testsuite/g++.dg/tree-ssa/dom-invalid.C
new file mode 100644
index 000000000..5513d3650
--- /dev/null
+++ b/gcc/testsuite/g++.dg/tree-ssa/dom-invalid.C
@@ -0,0 +1,52 @@
+// PR tree-optimization/39557
+// invalid post-dom info leads to infinite loop
+// { dg-do run }
+// { dg-options "-Wall -fno-exceptions -O2 -fprofile-use -fno-rtti" }
+
+struct C
+{
+ virtual const char *bar () const;
+};
+
+struct D
+{
+ D () : d1 (0) { }
+ C *d2[4];
+ int d1;
+ inline const C & baz (int i) const { return *d2[i]; }
+};
+
+struct E
+{
+ unsigned char e1[2];
+ D e2;
+ bool foo () const { return (e1[1] & 1) != 0; }
+ virtual const char *bar () const __attribute__ ((noinline));
+};
+
+const char *
+C::bar () const
+{
+ return 0;
+}
+
+C c;
+
+const char *
+E::bar () const
+{
+ const char *e = __null;
+ if (foo () && (e = c.C::bar ()))
+   return e;
+ for (int i = 0, n = e2.d1; i < n; i++)
+   if ((e = e2.baz (i).C::bar ()))
+     return e;
+ return e;
+}
+
+int
+main ()
+{
+ E e;
+ e.bar ();
+} // { dg-message  "note: file" "" }