Hello,
On 2021-08-18 12:40, Ronald S. Bultje wrote:
I don't think you can make that decision single-handedly. doesn't it
depend
on the situation, and shouldn't individual users and/or developers be
able
to make that decision themselves?
I agree, not all AVX512 instructions slow down those CPUs and heat the
room; especially when used only occasionally.
True, the AVX512 feature matrix is a mess but there are a lot of
instructions which simplify work with 256bit registers as well because
the restriction on 128bit lanes was lifted and a lot of new functions
where added.
It was shown that the occasional use of AVX512 instructions does not
significantly throttle CPUs. For example in a larger algorithm,
replacing sequences of AVX permute and shuffle instructions with single
AVX512 permute(ex)s could thus aid all AVX512 systems.
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