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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

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


Example how long would this program take to execute
Example: How long would this program take to execute?

R1 = R2

R2 = R1 + R3

R4 = R3 + R5

*R3, R4, R5 Already in data cache


Sequential Execution

Time = 12 Units

Re-ordered Execution

Time = 12 Units


The cdc 6600 the first computer to use oooe 1964
The CDC 6600. The first computer to use OoOE (1964)

Source: wikipedia




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