@mithro mentioned to me that Project X-Ray used the routing results to correlate with the bitstream to document the Xilinx 7-series FPGA bitstream. This means I need a decoded version of the design after place-and-route stage. I finally found ncd2ncl.exe.
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Within a segment you write "bit <bitname>" when that bit is present in the bitstream, or omit that line out for bits that aren't set. Finally write "tag <tagname> 1" for segments for which you know that feature <tagname> is activated. "Feature" could be a routing PIP for ex. 2/
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Write "tag <tagname> 0" for segments where you know that feature <tagname> is not enabled, and no other feature that may share the same bits are present. (Such as another routing PIP for the same destination net.) 3/
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