Indeed, only one port supports the corresponding instruction on Intel CPUs.
From the port usage reported at https://uops.info/html-instr/CRC32_R64_R64.html, we can conclude (B) for the Intel microarchitectures. For AMD it's not entirely obvious, but I agree (B) appears more likely.
Indeed, only one port supports the corresponding instruction on Intel CPUs.
From the port usage reported at https://uops.info/html-instr/CRC32_R64_R64.html, we can conclude (B) for the Intel microarchitectures. For AMD it's not entirely obvious, but I agree (B) appears more likely.