Oh cool, seems like we'll jump from zero to two direct competitors to IACA soon. I look forward to your tool (hopefully it can use the same IACA marker bytes so binaries and be compiled once for all these tools).
Yes, it will use the same marker bytes.
There is also llvm-mca, which is kinda neat since it uses the I formation that LLVM has about the op cost. Contrasting that to IACA or OACA is valuable as well.