ECS H61H2-LM3 REV 1.0 Schematic Circuit Diagram
ECS H61H2-LM3 REV 1.0 Schematic Circuit Diagram
Dataflow Analysis
Dataflow analysis examines the flow of data through the processor to look for out-of-order instruction execution chances. A particular dispatch/execute unit in the processor keeps track of a large number of instructions and may execute them in a way that best uses the multiple superscalar execution units. Even when cache misses and other data-dependent instructions might normally slow things down, the out-of-order execution of instructions can keep the execution units busy.
Speculative Execution
The processor's capacity to execute instructions ahead of the real program counter is known as speculative execution. Dataflow analysis is used by the processor's dispatch/execute unit to execute all available instructions in the instruction pool and save the results in temporary registers. The instruction pool is then searched for complete instructions that are no longer data reliant on other instructions to run or have unresolved branch predictions. If any completed instructions are discovered, the retirement unit or the relevant standard Intel architecture commits the results to memory in the sequence in which they were issued. After then, they are removed from the pool.
The constraint and dependence on linear instruction sequencing are largely removed with dynamic execution. It can keep the instruction units busy instead of waiting for data from memory by encouraging out-of-order instruction execution. Despite the fact that instructions can be predicted and performed out of order, the results are committed in the original sequence to ensure that program flow is not interrupted. This allows the P6 to execute current Intel architecture applications in the same way as the P5 (Pentium) and earlier CPUs did—only faster!
