> it is usually much easier to reach that throughput with AVX-512 than with AVX/AVX2 That's not what I understood from people who've gone through the exercise

> it is usually much easier to reach that throughput with AVX-512 than with AVX/AVX2 That's not what I understood from people who've gone through the exercise for GEMM. One probably relevant measurement: on BLIS' generic C GEMM micro-kernel, GCC doesn't get nearly as close to the hand-coded avx512 version as for avx2 with appropriate bock sizes.