On Mon, Jan 13, 2025 at 10:48:42AM +0000, Daniel P. Berrangé wrote:
> On Fri, Jan 10, 2025 at 01:45:44PM -0800, John Reiser wrote:
> > > A vendor-independent x86-64 psABI
> > > supplement defines four "microachitecture levels": `x86-64-v1` (the
> > > baseline, our code targets this), `x86-64-v2` (+`SSE3`, CentoOS
> > > targets this), `x86-64-v3` (+`AVX`), `x86-64-v4` (+`AVX512`) [1].
> > The levels are not explicit about the classification of a CPU that has
> > AVX (128-bit xmm registers) but lacks AVX2 (256-bit ymm registers.)
> 
> Lacking AVX2 means the CPU would NOT satisfy x86-64-v3. The Fedora change
> just gives a high level example. The canonical specification is at
> 
>   https://gitlab.com/x86-psABIs/x86-64-ABI

Thanks. I added this link to the Change page.

Zbyszek
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