Hi all,
This would offer performance benefits to compiled code on x86 builds -- we would be able to assume LAHF/SAHF, POPCNT, CRC32C, SSE3, SSE4.1, SSE4.2, and SSSE3 are always present and generate code accordingly. It would exclude certain older CPUs from running Fuchsia (K8 rev F, K10, Pentium 4/Pentium D, Core 2, Bonnell Atoms), however.
Please take a look / chime in if you're interested!
-- vs;