Higher baseline and failovers are possible in Rust, just not the default. The default configuration for the "x86-64" target is really meant to run on every x86

Higher baseline and failovers are possible in Rust, just not the default. The default configuration for the "x86-64" target is really meant to run on every x86-64 CPU. I know at lest Debian has the same policy. SSE2 is as old as x86-64 itself, so it can be assumed to be available in every x86-64 CPU, but nothing else can. There has been some movement to define pseudo-targets like x86-64-v1, x86-64-v2, x86-64-v3 for higher baselines.