88396c3923
Remove unnecessary barrier after A-matrix dot product writes. Each thread writes only to its own row; s_A isn't read cross-thread until forward substitution. Cuts A-matrix barriers from 128 to 65 (one per broadcast + one before forward sub). Pad s_A stride from 64 to 65 to eliminate bank conflicts in the W/U accumulation phase where all active threads read A(tid, j) with the same j value. GDN per-op: 5205 → 5136 µs. Combined with inter fusion: 6818 → 5136 µs (-24.7%). 16/16 tests pass. |
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