Pebbles is a RISC-V processor framework supporting plugable pipelines. Different pipeline implementations may be connected to the same instruction set implementation by way of a common pipeline interface. Pebbles is written in Haskell, using the Blarney library.
Currently, Pebbles supports the RV32IMAxCHERI instruction set and
two pipelines:
A 5-stage in-order scalar pipeline.
An 8-stage SIMT pipeline (Single Instruction Multiple Threads) with a parameterisable number of warps and warp size.
Currently, the only application of the Pebbles framework is the SIMTight GPGPU being developed on the CAPcelerate project.