pub const W4A16_BATCHM_WIDTHS: [u32; 5];Expand description
Tier widths in this family, narrowest first. Parallel to the handles
field of W4a16BatchmTiers and to the present array of
select_tier.
Deliberately stops at 8. w4a16_gemv_batch16/_batch32 exist but are NOT
in this table: only two call sites can use them, they are wide-tier trades
with their own (measured) __launch_bounds__-free codegen, and folding them
in here would silently widen every site that today caps at 8.