mirror of https://github.com/YosysHQ/yosys.git
5970be33fb
A real-world ABC9 flow hit residual combinational loops after SCC breaking, tripping the prep_xaiger loop assertion. Keep the existing topological assertions in place (prep_xaiger and reintegrate still assert no_loops). To handle residual non-box loops, add a targeted fallback in prep_xaiger: when loops remain after normal SCC breaking, insert additional $__ABC9_SCC_BREAKER cuts on non-box loop cells, rebuild toposort, and then re-check the existing assertion. Also keep pre-ABC9 SCC tagging on all cell types (scc -all_cell_types) and add a regression test (tests/techmap/abc9-nonbox-loop-with-box.ys). |
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| anlogic | ||
| common | ||
| ecp5 | ||
| efinix | ||
| fabulous | ||
| gatemate | ||
| gowin | ||
| ice40 | ||
| intel_alm | ||
| machxo2 | ||
| microchip | ||
| nanoxplore | ||
| nexus | ||
| quicklogic | ||
| xilinx | ||
| run-test.sh | ||