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Change the base cost for IPIN for SPEC #2447

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Merged
merged 4 commits into from
Nov 28, 2023
Merged

Change the base cost for IPIN for SPEC #2447

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3666586
change the IPIN base cost if spec is enabled
amin1377 Nov 21, 2023
5f89441
Merge branch 'master' of https://github.com/verilog-to-routing/vtr-ve…
amin1377 Nov 27, 2023
3c96ac0
Expand the comment on why we need different const when SPEC is enabled
amin1377 Nov 28, 2023
554841b
fix a typo
amin1377 Nov 28, 2023
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6 changes: 6 additions & 0 deletions libs/librrgraph/src/utils/alloc_and_load_rr_indexed_data.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -351,7 +351,13 @@ static void load_rr_indexed_data_base_costs(const RRGraphView& rr_graph,
rr_indexed_data[RRIndexedDataId(SOURCE_COST_INDEX)].base_cost = delay_normalization_fac;
rr_indexed_data[RRIndexedDataId(SINK_COST_INDEX)].base_cost = 0.;
rr_indexed_data[RRIndexedDataId(OPIN_COST_INDEX)].base_cost = delay_normalization_fac;
// IF the SPEC_CPU flag is set, we need to make sure that all floating point numbers are perfectly representable in
// binary format. Thus, we changed the IPIN_COST_INDEX base cost from 0.95 to 0.875.
#ifdef SPEC_CPU
rr_indexed_data[RRIndexedDataId(IPIN_COST_INDEX)].base_cost = 0.875 * delay_normalization_fac;
#else
rr_indexed_data[RRIndexedDataId(IPIN_COST_INDEX)].base_cost = 0.95 * delay_normalization_fac;
#endif

auto rr_segment_counts = count_rr_segment_types(rr_graph, rr_indexed_data);
size_t total_segments = std::accumulate(rr_segment_counts.begin(), rr_segment_counts.end(), 0u);
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