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Experimentation of Dual Issue

techguyz

Hi all,

Can somebody specify asm code to experiment the dual issue of instructions and how the processor executes parallely ?

Also i tried like performing LDM instruction followed by LSL instruction.

  • 0 Arm Employee Badge

    I am not sure what exactly you are looking for in the way of code sequences.

    In terms of whether a given two instructions will dual issue depends on a number of things:

    • The specific processor(s) you are working with
    • The other instructions around the pair
    • Whether there register dependencies
  • +1 in reply to Martin Weidmann

    I presume you mean dual issue in-order like an A7 rather than being able to issue two instructions at a time out of order.

    I'm fairly sure no dual issue processor will bother trying to do a load or store multiple in parallel with anything else. Too big a job checking for dependencies for too little relative gain.