Hi Marten, By default, they won't work at all - Python runtime error will be raised or segfault/illegal instruction error may occur. However, if Linux distros or downstream packagers want to change this default setting, they can do it through the build options, but without manual SIMD support for the baseline - just the scalar fallbacks. They can still count on the dispatched kernels for newer processors.
I have also updated the docs providing an example for this case, see: https://github.com/numpy/numpy/blob/c41541abe9656987c34eb3f5822879ade84ec612/doc/source/reference/simd/build-options.rst#targeting-older-cpus On Sat, May 17, 2025 at 4:01 PM <[email protected]> wrote: > Hi Sayed, > > I'm a bit confused: does your suggested change mean that prre-2009 > processors won't work at all, or that no use will be made of the (little) > acceleration that they provided? The latter seems fine, but not working at > all seems rather bad. Though I'd think that for any old processors one can > just fall back to the standard `libm` implementations. > > All the best, > > Marten > _______________________________________________ > NumPy-Discussion mailing list -- [email protected] > To unsubscribe send an email to [email protected] > https://mail.python.org/mailman3/lists/numpy-discussion.python.org/ > Member address: [email protected] > -- Cheers, Sayed Sayed Adel GitHub: seiko2plus
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