!320 (merged) has the side effect of breaking detection of SVE vectorization support and enablement of SVE in the compiler. My patch should properly fix the underlying problem.
py-cpuinfo is supported on ARM64 and can be used to detect Neon and SVE. However, there was indeed a bug here -- Neon is identified as
asimd in /proc/cpuinfo, so we should check for
asimd instead of
-march=native was not supported by Clang before 15,
-mcpu=native is supported by GCC 6+ and Clang 7+. Let's use that instead of not adding a flag at all -- otherwise SVE support is not enabled in the compiler even if the hardware supports it.