On Wed, Jul 24, 2013 at 07:36:31PM +0200, Richard Biener wrote: > "H.J. Lu" <hjl.to...@gmail.com> wrote: > > >On Wed, Jul 24, 2013 at 8:23 AM, Richard Biener > ><richard.guent...@gmail.com> wrote: > >> "H.J. Lu" <hjl.to...@gmail.com> wrote: > >> > >>>Hi, > >>> > >>>Here is a patch to extend x86-64 psABI to support AVX-512: > >> > >> 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. > > IMHO it was a mistake to not have any callee saved xmm register in the > original abi - we should fix this at this opportunity. Loops with function > calls are not that uncommon. > I also noticed this problem and best solution that I came upon is analogue to __attribute__((fastcall))
This would make possible for libraries to add versioned symbols that use attribute and migrate to saner calling convention. > Richard. > > >-- > >H.J. >
