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FallenSigh 45731e05b7 perf(matmul): add pipeline timing diagnostics (v2.1) ...

Measure per-phase wait times and stall counts to identify bottleneck:
- PIPE_WAIT_IP / DMA0 / DMA1: aggregate wait time per resource
- PIPE_FIRE_DMA / IP: register write overhead
- PIPE_STALL_*: iterations where each resource actually blocked

Output after standard markers, before MATMUL_DONE.
Allows data-driven decision on next optimization target:
  wait_ip dominant → optimize IP (HW multiplier pipeline)
  wait_dma0 dominant → pre-fire insufficient (wider bus/faster RAM)
  wait_dma1 dominant → bank reuse delay (deeper buffering)

2026-06-26 03:54:20 +08:00

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