On Thu, 26 Mar 2026 at 11:19, Hongxu Jia <[email protected]> wrote: > > Reading https://numpy.org/doc/stable/reference/simd/build-options.html, > > I do not think setting disable_optimization to true by defailt is > > correct. Currently, numpy will auto-detect the capabilities of target > > machine, and configure itself accordingly. With this change, that auto > > detection is compeltely turned off. > > > > Please explain the rationale for this change. > > In our case, we use `-cpu kvm64' other than `-cpu Skylake-Client > -machine q35,i8042=off' > > QB_CPU_KVM:intel-x86-64 = "-cpu kvm64"
If that cpu doesn't support v3 (or even v2) features, then you should not use the default x86-64 tune (that qemux86-64 is using and passing to compilers) to enable them. Alex
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