On Wed, 24 Jul 2013, H.J. Lu wrote: > > Afaik avx 512 doubles the amount of xmm registers. Can we get them > > callee saved please? > > Make them callee saved means we need to change ld.so to > preserve them and we need to change unwind library to > support them. It is certainly doable.
And setjmp/longjmp (with consequent versioning implications if there isn't enough space in jmp_buf). Avoiding the need for such library changes in order to use new instruction set features is why it's usual to make new registers (or new bits of existing registers) call-clobbered. -- Joseph S. Myers jos...@codesourcery.com
