superscalarprocessor's Introduction
Superscalar processor simulator: Extend the scalar pipeline processor simulator, to support n-wide (configurable parameter) superscalar processor that can fetch n instructions per cycle, decode n instructions per cycle, issue n instructions per cycle, and commit n instructions per cycle. Add all the necessary components to support multi-instruction issue, out-of-order execution, in-order commit, operand forwarding, load bypassing, load forwarding, structural hazards handling, and false dependency elimination. Assume that each functional unit has a set (configurable parameter) of reservation stations. Implement the register-renaming concept as discussed in the Tomasulo algorithm. Note that source operands can be available either from a register file or from reservation stations. The simulator needs to take care of precise exception handling. In order to support superscalar processing, consider the following changes to the scalar pipeline processor: • The Register Read (RD) stage can perform both register read as well as instruction dispatch to reservation stations. • Execute (EX) and Memory access (MEM) stages are combined together as a multi-cycle Execute stage • The Write-Back (WB) stage is split into Complete stage and Retire stage to deal with ALU/LD and ST instructions, respectively Assume that the simulator simulates the same set of instructions as was consider for the scalar pipeline processor design. Assume that when both load and store requests come to the data cache at the same time, load requests will be given priority. Also assume that the architectural register file consists of 8 registers, whose values can be initialized at run-time. Design the simulator in such a way that user can specify the number of entries in the reservation station, re-order buffer, store buffer, and the latency for each ALU operation. Given a program code (will be supplied at the evaluation time), the simulator has to compute the total number of cycles required to complete the execution of the code, the final result of the computation, and the contents of the architectural register file.
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