Allow multi-source packet flows; fix pathfinder silent drop#2963
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Allow multi-source packet flows; fix pathfinder silent drop#2963
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PacketFlowOp::verify() was rejecting flows with more than one aie.packet_source, breaking valid fan-in topologies that predate the verifier check added in PR #2919. Relax the check from `numSources != 1` to `numSources < 1` so zero-source flows are still rejected while multi-source flows are accepted. The pathfinder (AIEPathFinder.cpp / AIECreatePathFindFlows.cpp) had a related "last source wins" bug: Pass 1 overwrote the single srcCoords/ srcPort accumulator on each PacketSourceOp, silently dropping all but the last source before calling addFlow(). This is left for a follow-up fix; the per-source loop change belongs in a separate commit. Tests added / updated: - badpacket_flow_source_count.mlir: remove multi-source rejection case (no longer an error), update error message for zero-source case - multi_source_packet_flow.mlir: positive verifier regression test - multi_source_pathfinder.mlir: pathfinder-level regression test (currently failing — documents the remaining bug) - npu-xrt/multi_source_packet_flow/: end-to-end hardware test Co-Authored-By: Claude Sonnet 4.6 <[email protected]>
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PacketFlowOp::verify() was rejecting flows with more than one aie.packet_source, breaking valid fan-in topologies that predate the verifier check added in PR #2919. Relax the check from
numSources != 1tonumSources < 1so zero-source flows are still rejected while multi-source flows are accepted.The pathfinder (AIEPathFinder.cpp / AIECreatePathFindFlows.cpp) had a related "last source wins" bug: Pass 1 overwrote the single srcCoords/ srcPort accumulator on each PacketSourceOp, silently dropping all but the last source before calling addFlow(). This is left for a follow-up fix; the per-source loop change belongs in a separate commit.
Tests added / updated: