Dynamic instruction scheduling slideshare

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26 Nov 2013 INSTRUCTION PIPELINE DESIGN Dynamic Instruction Scheduling • Idea of Static Scheduling o Compiler based scheduling strategy to resolve The order in which the instructions comprising a program are to be executed is A dynamic scheduling technique has to insure that any instructions obeyed out Unit 8: Static and Dynamic Scheduling. CIS 501 Slides originally developed by Drew Hilton and Increases clock frequency by staging instruction execution. Dynamic instruction scheduling. Key idea: allow subsequent Common Data Bus: data source (snooping) Tomasulo example, cycle 0. Tomasulo example (Refer Slide Time: 04:36). And particularly in the context of Superscalar architecture we shall discuss about this dynamic instruction scheduling the need is Dynamic Scheduling Static Scheduling – Compiler rearranging instructions to reduce stalls Dynamic Scheduling – Hardware rearranges instruction stream to If instruction causes structural hazard or a data hazard either due to earlier instruction in execution or to earlier . Dynamic Scheduling by Scoreboard: With dynamic scheduling the hardware tries to rearrange the instructions during run-time to reduce pipeline stalls. – Simpler compiler. – Handles dependencies Dynamic Scheduling Introduction. • In classic 5-stage pipeline, both structural and data hazards could be checked during ID stage. – When an instruction could12 May 2012 [10 14]dynamic instruction scheduling for microprocessors having out of order execution. 1. Computer Engineering and Intelligent Systems