V is the B operand with block_mn=16 in the PV MMA. Its canonical layout
uses CORES_MN=16/8=2, not 128/8=16. The previous code used CORES_MN=16
which produced wrong canonical indexing → garbage PV output.
Also:
- V SMEM size is (16,16) canonical = 256 BF16, not (128,16) = 2048
- P written as 16 elements at row 0 (T=1 decode)
- V loaded from TMA (16,128) and sub-sampled to (16,16) canonical
- V TMA coord: {col_start, d_base} for (HD,s_k) tensor
biondizzle
2262e10fca