biondizzle b3d1aae038 feat: full FP4 activations for mxf4nvf4 - E2M1 packed A side + UE4M3 scales ...

mxf4nvf4 requires BOTH A and B to be FP4 (E2M1 packed).
Changes:
- a_dtype_t: float_e4m3_t → float_e2m1_unpacksmem_t
- UMMA_K: 32 → 64 (FP4 MMA atom)
- L1 epilogue: FP8 quant → E2M1 FP4 quantization with nearest-neighbor
- L1 output SMEM: packed E2M1 (2 per byte), TMA store uint8
- TMA descriptors: adjusted for FP4 packing (K/2 bytes per row)
- SymmBuffer: uint8 activations, shape (M, K//2)
- Staging kernel: BF16 → E2M1 packed + UE4M3 block16 scales

2026-05-11 20:29:08 +00:00

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