https://gcc.gnu.org/bugzilla/show_bug.cgi?id=70164
--- Comment #9 from Jeffrey A. Law <law at redhat dot com> --- I think that's a fair characterization. The extra copy emitted by the older compiler gives the allocator more freedom. With coalescing getting more aggressive, the copy is gone and the allocator's freedom is reduced. I'll try to have a look at what the allocator is doing, but I doubt it's realistically something that can be addressed in this release cycle.
