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VexiiRiscv + MiCo

VexiiRiscv-MiCo is a mixed-precision computing extension plugin for VexiiRiscv.

You can find the MiCo plugin in scala class vexiiriscv.execute.MiCoPlugin.

MiCo Plugin

The MiCo plugin provides 10 custom insturctions, focusing on signed dot product operations between two 32/64-bit vectors. Each of the packed vectors can contain INT8/INT4/INT2/INT1 data.

Usage

To add the MiCoPlugin into Param.scala, you need to find the lines about the lane0, and add one more line for MiCoPlugin:

val early0 = new LaneLayer("early0", lane0, priority = 0)
plugins += lane0
plugins += new SrcPlugin(early0, executeAt = 0, relaxedRs = relaxedSrc)
plugins += new MiCoPlugin(early0) // Add MiCoPlugin Here!
plugins += new IntAluPlugin(early0, formatAt = 0)
plugins += shifter(early0, formatAt = relaxedShift.toInt)
plugins += new IntFormatPlugin(lane0)
plugins += new BranchPlugin(layer=early0, aluAt=0, jumpAt=relaxedBranchtoInt, wbAt=0)

Then you can generate/simulate VexiiRiscv with MiCo Plugin, check the VexiiRiscv guides below.

Due to the custom instructions added, please turn off RVLS when simulating (--no-rvls-check).