[x86-64 psABI]: Extend x86-64 psABI to support AVX-512

[Richard Biener]

"H.J. Lu" <hjl.tools@gmail.com> wrote:

>On Wed, Jul 24, 2013 at 8:23 AM, Richard Biener
><richard.guenther@gmail.com> wrote:
>> "H.J. Lu" <hjl.tools@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.

Richard.

>--
>H.J.