V1 already had 4 128bit pipes, SVE just used two simultaneously. The only real gain in benchmarks on V1 with 256bit SVE over 128bit NEON was in load-heavy kerne

V1 already had 4 128bit pipes, SVE just used two simultaneously. The only real gain in benchmarks on V1 with 256bit SVE over 128bit NEON was in load-heavy kernels that were bottlenecked by the 5-wide decode, and weren't saved by the MOP cache. Improving decode width is easier now that 32-bit is dead (or maybe V2's MOP cache was improved enough...), so 256bit wide isn't terribly useful unless they commit the transistors and power budget for an even wider backend than 512bit/cycle.