MCLR5 Quad-issue Superscalar RISC V initial results

Im working on a Quad-issue Superscalar RISC V processor at the moment and I thought I would share an exciting milestone….

This is a simulation snippet of four RISC V ADDI r1,r1,0x1 instructions in a row. The core fetches and executes the four instructions simultaneously and writes it back to r1, all in one clock cycle.    Neat!!!

The MCLR5 is a quad-issue superscalar RISC V processor core with single-cycle instruction timing.  There are four combinational RISC V ALU cores which process four consecutive instructions and can update up to four registers per clock cycle. The core should come fairly close to an aggregate IPC of nearly four.

 

Quadissue1

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MCLR5 Quad-issue Superscalar RISC V initial results