Pipeline Performance and CPI Decomposition: Step-by-Step Walkthrough

Step-by-step walkthrough

Step-by-Step Walkthrough for Pipeline Performance and CPI Decomposition is anchored on Measured CPI broken into ideal base CPI, structural stalls, data stalls, control stalls, and memory wait contributions.. Convert observations into mechanism-backed decisions with explicit ownership.

1. Define failing workload and acceptance threshold.

2. Capture reproducible metadata and evidence snapshot.

3. Classify dominant mechanism path.

4. Propose minimal reversible change.

5. Validate cross-workload and corner behavior.

6. Document owner and rollout decision.

Reference path

RISC-V PIPELINE DIAGRAM - Pipeline Performance and CPI Decomposition

PC -> IF -> ID -> EX -> MEM -> WB
      |     |      |      |      |
  i-cache decode  ALU/BR  LSU    regfile write
              \   |
               +-> branch resolve + redirect

Hot paths:
  - branch + load-use dependencies in ID/EX
  - memory latency stretching MEM stage
  - writeback arbitration for integer/vector units

Focus: keep control hazards predictable