3 ms·

Thank you. Guessing the Z extensions are AES operations? Supervisor ops?

• snvzz 4y ago
  The cores are SiFive U74-MC, the version is, I believe, 21G1. These are documented. But that design is configurable. We know B extension (optional) is enabled. I have no idea about every other setting this core can be synthesized with.
  • snvzz 4y ago
    Update: B extension is apparently not actually enabled. Alas.
    • moloch-hai 4y ago
      As usual. Sigh. Just Zpopcnt would go a long way.
      • snvzz 4y ago
        It might have popcnt. It might have Za and Zb. It just doesn't claim to have B (the whole package).
        • moloch-hai 4y ago
          Looks like Zbb is where the "CPOP" and related instructions (popcount, count leading/trailing zeroes) live. Zba ("and-not" etc.) and Zbs (single-bit) are more obscure and less important. Zbc (carry-less multiply) is interesting.
• Taniwha 4y ago
  more like generic tweaks rather than large swathes of stuff