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Hazard handling

Concept WIKI v1 · 5/25/2026

**Hazard handling** is a feature of the referenced 5-stage pipelined MIPS processor implementation. The processor is written in SystemVerilog and is described as being “capable of hazard handling,” meaning its pipeline design includes mechanisms intended to address situations where normal pipelined execution could otherwise produce incorrect behavior or require coordination between pipeline stages.[^0]

Hazard handling

Hazard handling is a feature of the referenced 5-stage pipelined MIPS processor implementation. The processor is written in SystemVerilog and is described as being “capable of hazard handling,” meaning its pipeline design includes mechanisms intended to address situations where normal pipelined execution could otherwise produce incorrect behavior or require coordination between pipeline stages.[1]

Context

The design is a 5-stage pipelined MIPS processor implemented in SystemVerilog.[1] In a classic 5-stage MIPS pipeline, instructions are overlapped across stages so that multiple instructions are in progress at once. Hazard handling is necessary in such a design because overlapping execution can create dependencies between instructions or conflicts in control flow.

The repository description identifies hazard handling as a supported processor capability, alongside a UVM-based verification environment.[1]

Role in the processor

In this project, hazard handling is part of the processor’s pipeline functionality. Its purpose is to help the pipelined CPU maintain correct execution when pipeline hazards arise. The available evidence does not specify the exact mechanisms used, such as forwarding, stalling, flushing, branch handling, or load-use interlocks. However, because the design is explicitly described as a 5-stage pipelined MIPS processor with hazard-handling capability, hazard handling should be understood as an architectural support feature of the CPU pipeline.[1]

Verification environment

The project also includes a UVM verification testbench.[1] The verification environment contains:

  • a randomizing instruction generator,
  • a monitor, and
  • a coverage collector.[1]

These components are relevant to hazard handling because randomized instruction streams can exercise many instruction-ordering cases, monitors can observe processor behavior, and coverage collection can help determine whether important execution scenarios have been tested. The evidence does not state which specific hazard scenarios are covered, but the presence of these UVM components indicates that the processor is accompanied by a structured verification setup.[1]

Implementation language and project type

The processor and its hazard-handling capability are part of a hardware design implemented in SystemVerilog.[1] The repository presents the design as a MIPS CPU project rather than a software simulator, and includes both the hardware implementation and verification infrastructure.[1]

Summary

Hazard handling in this repository refers to the pipeline-support capability of a 5-stage SystemVerilog MIPS processor. The project description confirms that the processor supports hazard handling and that it is verified using a UVM testbench with randomized instruction generation, monitoring, and coverage collection.[1]

References

[1]: Evidence 0ba83467-72ea-4215-8031-32f44ee7c3ab, repository description: “This is a 5-stage pipelined MIPS processor implemented with System Verilog. The processor is capable of hazard handling. This project also contains a UVM verification testbench including a randomizing instruction generator, a monitor, and a coverage collector.”