FlashAttention3Config had four flags, all dead or with dead else-branches:
- use_sparse_patterns: write-only (sparse_pattern Mask is created
unconditionally via create_sparse_mask)
- io_aware_tiling: always-true setter; the "else" branch called
standard_attention which itself discarded all its QK/scale/mask work
and called io_aware.compute_attention — pure dead code
- cuda_optimization: load_kernels() gate, always true in practice
- standard_attention method + mask parameter on forward(): entirely dead
Per user directive "all features enabled" / "should be used":
- Deleted 4 fields (use_sparse_patterns, io_aware_tiling, cuda_optimization, sparse_pattern_iterations) — note sparse_pattern (BlockSparsePattern) stays
- Collapsed forward() to unconditional io_aware.compute_attention, dropped mask param
- Removed 40-LOC standard_attention dead fallback
- Dropped AttentionStats.io_aware_enabled field + test assertion
- cuda_kernels load unconditionally
298cc33fcb