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fix(attention): remove stale barrier_O arrive in empty-tile fast path - #13
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fdz-1999 merged 1 commit intoAug 18, 2026
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In BatchPrefillWithKVCacheKernel, when a work tile hits num_kv_tiles <= 0 and exits early via store_zero + continue, the epilogue barrier parity is now handled internally by store_zero, so the manual barrier_O arrive from warp NUM_WARPS-1 is no longer needed — and can cause a spurious wake when the epilogue protocol has already moved on. Co-Authored-By: Claude <noreply@anthropic.com>
fdz-1999
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Aug 18, 2026
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