You can also dispatch at runtime based on CPUID (x86) or getauxval(AT_HWCAP) for ARM. Also Clang and GCC seem to be moving in the direction of removing -march=n

You can also dispatch at runtime based on CPUID (x86) or getauxval(AT_HWCAP) for ARM. Also Clang and GCC seem to be moving in the direction of removing -march=native which is sad since grokking all the different microarchitectures isn't easy.