ILP Exercises.pdf - ILP Thursday 7:50 AM CONTROL HAZARDS 1...

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CONTROL HAZARDS: 1. Stall/PT/PNT/Delay Slot delay slot: ADD BNEZ ‐‐slot—move ADD here 2. BHT = predictions (dynamically PT, PTN based on 2‐bit state machine), having just the new PC, cuts some stall cycles 3. BTB = predictions + where to go + (and possibly) predicted fetch, having new instruction, saves more stall cycles 4. Speculative Exec = start executing new instructions (from the target or fall‐through based on your dynamic speculation. Put the temp values on temp registers, never on M. If prediction is determined to be correct, put all intermediate values on proper registers. If prediction/speculation is wrong, just HW UNDO! More important with multi core systems. What is good about dynamic scheduling? 8 16 32 64 BIT‐LEVEL … THE END; THE WALL = Speed of Light; 1/2 of the speed of light = copper wire; and Atom size. REPLICATE! REPLICATE!REPLICATE!REPLICATE!REPLICATE! Parallel algorithms/programs = too complex 1) Make the uniprocessors better; after 2000 took over. Uniprocessors themselves became parallel systems. 2) Start working at instruction level: ILP MULTI ISSUE ‐ Multiple Functional Units APPL – loop level 1)
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