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refactoring: create warp_inst_t that provides notion of a group of scalar instructions
traveling down the pipeline.
delete DWF
delete MIMD
delete warp_tracker
delete old writeback stage, replace it with a stub that just writes back everything
delete old pipeline model
current status: MSHR's need to change to deal with the new structure
[git-p4: depot-paths = "//depot/gpgpu_sim_research/fermi/distribution/": change = 7814]
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(i'll use "fermi" for more disruptive changes to the pipeline model such
as updating the MSHRs and getting rid of the warp tracker, ripping out DWF, etc...)
[git-p4: depot-paths = "//depot/gpgpu_sim_research/fermi/distribution/": change = 7805]
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this integrates the ptxplus functional model changes, but has only been
verified with CUDA 3.1 PTX regressions (which pass)
still need to verify ptxplus itself is working in this branch
[git-p4: depot-paths = "//depot/gpgpu_sim_research/fermi/distribution/": change = 7435]
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(add scoreboard logic from ptxplus branch and modified operand collector
with parallel ALU/SFU pipelines)
passing regressions
[git-p4: depot-paths = "//depot/gpgpu_sim_research/fermi/distribution/": change = 7419]
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