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FallenSigh f55e15af32 perf(matmul): remove all DMA TAG writes (hardware ignores TAG register) ...

Each uncached TAG write costs ~810ns on the AXI bus. Removed:
- 2 TAG writes per main loop iteration (Ch1 store + Ch0 pre-fire)
- 2 TAG writes in prologue (group 0 load + pre-fire group 1)
- 1 TAG write in epilogue (final store)

Total: ~10,000 wasted AXI transactions eliminated for 5000 groups.
Estimated ~8% reduction in per-iteration time.

2026-06-26 17:49:39 +08:00

..

bsp

Restore timing + switch to polling + disable CPU interrupts (IE=0)

2026-06-26 01:01:48 +08:00

examples

perf(matmul): remove all DMA TAG writes (hardware ignores TAG register)

2026-06-26 17:49:39 +08:00