There doesn't seem to be any differences. I've used http://gcc.godbolt.org/ http://gcc.godbolt.org/, where one can also use Clang and compare the produced assem

There doesn't seem to be any differences. I've used http://gcc.godbolt.org/ http://gcc.godbolt.org/, where one can also use Clang and compare the produced assembly by it with GCC's. At least one optimization is done by Clang 3.4.1, but not by GCC 4.2.1 and 4.9.0.