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Add PlacerSetupSlacks interface#1450

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Bill-hbrhbr wants to merge 24 commits intoverilog-to-routing:masterverilog-to-routing/vtr-verilog-to-routing:masterfrom

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Commits on Jul 23, 2020

• Added interface for mapping between CLB pins and setup slacks. Refactored PlacerCriticalities, and created PlacerSetupSlacks, so that they can choose between doing incremental V.S. from scratch upd…

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• Refactored criticalities update in place.cpp and added setup slacks update. Added checks to see if the updates need to be done from scratch or can be done incrementally

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• Fixe up format and compilation errors

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Commits on Jul 31, 2020

• Merged 3 update routines into 1 single routine

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• Resolve merge conflicts

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• Resolve more merge conflicts

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• Changed crit_exponent to first_crit_exponent/state.crit_exponent

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Commits on Aug 6, 2020

• Created a setup slack matrix that copies data from the PlacerSetupSlacks. The matrix update is incremental according to the pins with modified setup slacks returned from PlacerSetupSlacks. Outer lo…

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• Provided more complete explanation for the record_setup_slacks routine.

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• Added placement snapshot functions that facilitates the reversion of a series of successful moves done by try_swap. Right now the data structures representing the state variables are directly being…

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• Merge the master branch into PlacerSetupSlacks (updating vtr flow

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• Implemented do_setup_slack_cost_analysis: softmax of negative slacks

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Commits on Aug 11, 2020

• Added single move reversion for setup slack analysis(rather than taking placement snapshots). Currently experiencing consistency failures. Also updated slack analysis cost function: comparing the w…

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Commits on Aug 14, 2020

• Corrected the timing update and reversion of setup slack analysis during the placement quench stage. Made commit_td_cost method incremental by only going through sink pins affected by the moved blo…

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• Moved four boolean global variables controlling the timing update into a new local structure called t_placer_timing_update_mode to tidy up the code.

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Commits on Aug 20, 2020

• Added vpr option --place_quench_metric to turn on/off setup slack analysis during placement quench. Possible options are: auto, timing_cost, setup_slack.

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Commits on Aug 21, 2020

• Merged t_placer_costs and t_placer_prev_inverse_costs and added

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Commits on Aug 22, 2020

• Reduced down the argument list for starting_t, placement_inner_loop, and try_swap by passing variables using t_annealing_state. Also moved first move_lim determination process to a separate routine

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• Moved t_placer_costs and t_annealing_state and related routines to placer_util.* files.

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Commits on Aug 24, 2020

• Changed major place.cpp data structures from file scope to global scope. Moved delay routines to place_delay_model.*. Moved annealing update routines to place_util.*. Enhanced documentations.

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• Moved timing update routines from place.cpp to place_timing_update.*. Enhanced documentation.

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Commits on Aug 25, 2020

• Enchanced documentation for timing_place.*. Moved chanx, chany 2d arrays to the placement global file. ALso fixed a bug with in class static constexpr variable compilation issue.

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Commits on Aug 26, 2020

• Added documentation for the timing driven routines used in try_swap() in place.cpp.

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• Merge branch 'master' into PlacerSetupSlacks

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