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, 31 insertions, 0 deletions

diff --git a/gcc/testsuite/g++.dg/tree-ssa/copyprop-1.C b/gcc/testsuite/g++.dg/tree-ssa/copyprop-1.C
new file mode 100644
index 000000000..03f6b1207
--- /dev/null
+++ b/gcc/testsuite/g++.dg/tree-ssa/copyprop-1.C
@@ -0,0 +1,31 @@
+/* { dg-do compile } */
+/* { dg-options "-O -fdump-tree-dce2" } */
+
+/* Verify that we can eliminate the useless conversions to/from
+   const qualified pointer types
+     this_2 = o_1;
+     D.20003_4 = this_2->data_m;
+     this_5 = D.20003_4;
+     D.20005_6 = this_5->value;
+   copyprop should propagate o_1 and D.20003_4 to the loads of data_m
+   and value.  dce removes all traces of this.  */
+
+struct Data {
+  int get() const { return value; }
+  int value;
+};
+
+struct Object {
+  int operator[](int i) const { return data_m->get(); }
+  Data *data_m;
+};
+
+int foo(Object&o)
+{
+  return o[0];
+}
+
+/* Remaining should be two loads.  */
+
+/* { dg-final { scan-tree-dump-times " = \[^\n\]*;" 2 "dce2" } } */
+/* { dg-final { cleanup-tree-dump "dce2" } } */