https://gcc.gnu.org/bugzilla/show_bug.cgi?id=70465
--- Comment #10 from Jeffrey A. Law <law at redhat dot com> --- Coming back to Uros's c#5, the more I think about it, that's the solution. reg-stack ought to be able to use dependency information to determine if it can swap two insns rather than inserting a fxchg. I'm not actually working on this, but wanted to make sure anyone looking at this in the future is aware that Uros's suggestion is, IMHO, the right way to go.
