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[WIP] Clean up confusing rr-node lookup convention for x/y location of CHANX nodes #3042

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@soheilshahrouz soheilshahrouz commented May 14, 2025

RRSpatialLookup swaps the x and y coordinates of CHANX wires when putting them in the rr_node_lookup data structure, and find_node() function swaps them as well. This PR gets rid of these swaps.

Addresses #355 and #2978

@github-actions github-actions bot added VPR VPR FPGA Placement & Routing Tool lang-cpp C/C++ code labels May 14, 2025
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