https://gcc.gnu.org/bugzilla/show_bug.cgi?id=65782
--- Comment #4 from Daniel Fruzynski <bugzi...@poradnik-webmastera.com> --- I have found that I can use -ffixed-reg option for this. It allows to eliminate one register, so I have to use it 16 times to eliminate all xmm16..31 registers. It would be handy to have another option which would allow to disable all registers from this group together.
