Are they trying to bring back SIMD-within-a-register? Though that only gives you ~one order of magnitude doing packed 4-bit stuff with 64-bit GPRs. And perhaps

Are they trying to bring back SIMD-within-a-register? Though that only gives you ~one order of magnitude doing packed 4-bit stuff with 64-bit GPRs. And perhaps fixed-point, sign-exponent and posits are unregulated.