That's mostly true. For something like TensorFlow -march=native can be like night and day. What I try to do with Cosmopolitan Libc, is CPUID dispatching, so it

That's mostly true. For something like TensorFlow -march=native can be like night and day. What I try to do with Cosmopolitan Libc, is CPUID dispatching, so it doesn't matter what the march flag is set to, for crucial code paths like CRC32, which go 51x faster if Westmere is available.