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CPU Optimization

CPU Optimization. Out-of-Order Execution (OoOE). CPU with separate instruction and data caches. FLASH. RAM. Instruction Cache. Data Cache. ALU. An Ideal Pipeline. Pipeline with instruction & data cache. Instruction NOT in cache. Operand NOT in cache.

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CPU Optimization

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  1. CPU Optimization Out-of-Order Execution (OoOE)

  2. CPU with separate instruction and data caches FLASH RAM Instruction Cache Data Cache ALU

  3. An Ideal Pipeline Pipeline with instruction & data cache Instruction NOT in cache Operand NOT in cache

  4. Example: How long would this program take to execute? R1 = R2 R2 = R1 + R3 R4 = R3 + R5 *R3, R4, R5 Already in data cache

  5. Sequential Execution Time = 12 Units Re-ordered Execution Time = 12 Units

  6. The CDC 6600. The first computer to use OoOE (1964) Source: wikipedia

  7. Reservation Stations (Buffer)

  8. OoOE Hardware

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