Re: [Xen-devel] [PATCH v8 44/50] x86emul: support VPCLMULQDQ insns

2019-06-21 Thread Jan Beulich
>>> On 21.06.19 at 14:52, wrote: > On 15/03/2019 11:05, Jan Beulich wrote: >> As to the feature dependency adjustment, while strictly speaking AVX is >> a sufficient prereq (to have YMM registers), 256-bit vectors of integers >> have got fully introduced with AVX2 only. Sadly gcc can't be used as

Re: [Xen-devel] [PATCH v8 44/50] x86emul: support VPCLMULQDQ insns

2019-06-21 Thread Andrew Cooper
On 15/03/2019 11:05, Jan Beulich wrote: > As to the feature dependency adjustment, while strictly speaking AVX is > a sufficient prereq (to have YMM registers), 256-bit vectors of integers > have got fully introduced with AVX2 only. Sadly gcc can't be used as a > reference here: They don't provide

[Xen-devel] [PATCH v8 44/50] x86emul: support VPCLMULQDQ insns

2019-03-15 Thread Jan Beulich
As to the feature dependency adjustment, while strictly speaking AVX is a sufficient prereq (to have YMM registers), 256-bit vectors of integers have got fully introduced with AVX2 only. Sadly gcc can't be used as a reference here: They don't provide any AVX512-independent built-in at all. Along t