Data hazards (Example)

• For single pipeline in order issue: Read After Write hazard (RAW)

Add R1, R2, R3 #R1 is result register

Sub R4, R1,R2 #conflict with R1

Add R3, R5, R1 #conflict with R1

Or R6,R1,R2 #conflict with R1

# but can be OK

Add R5, R2, R1 #R1 OK now

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