3 ms·

> it's still a strict upgrade over AVX2 If you benchmark it, it will be slower about half the time.

• adgjlsfhk1 9mo ago
  for the simplest cases it will be about the same speed as avx2, but if you're trying to do anything fancy, the extra registers and instructions are a godsend.
  • fooker 9mo ago
    Well, try it out for a realistic program. It makes for nice looking code, yes. But is often slower (for various reasons that are well understood by now).
    • adrian_b 9mo ago
      Please mention some of those reasons.
• adrian_b 9mo ago
  I do not know what benchmarks do you have in mind. All the benchmarks that I have ever seen published about AVX-512 vs. AVX2 on AMD Zen 4 have shown better performance on AVX-512. Very frequently, the AVX-512 performance was not a little better, but much better, despite the fact that on Zen 4 both program versions use exactly the same execution resources (but AVX-512 programs have less instructions, which avoids front-end bottlenecks).