AI Changelog Aggregator

[SYCL] Fix reorder MMVQ assert on unaligned vocab sizes (#22035)

[SYCL] Fix reorder MMVQ assert on unaligned vocab sizes

The reorder mul_mat_vec_q dispatchers for Q4_0, Q8_0, Q4_K, and Q6_K asserted that block_num_y was a multiple of 16 subgroups. Models with a vocab size not divisible by 16 (for example HY-MT at 120818) aborted on model load when the output projection tripped the assert.

I replaced the assert with padding: block_num_y now rounds up to a whole number of subgroup-sized workgroups. The kernel already has the row bounds check (if (row >= nrows) return;) so the extra padded threads early-exit cleanly. Row values are uniform across a subgroup so the collective reduce stays safe.

For aligned vocab sizes the padded block_num_y equals the old value, so the kernel launch is identical and there is no regression.

Thanks to @arthw for flagging the relationship to #21527.

Fixes #22020.

AI assisted coding, tested on Intel B70 hardware.

sycl: use WARP_SIZE for num_subgroups in reorder MMVQ launches

Replaces the hardcoded 16 with WARP_SIZE in the four reorder_mul_mat_vec launch helpers (Q4_0, Q8_0, Q4_K, Q6_K). Compile-time no-op on the Intel target where WARP_SIZE is 16, but makes the relationship to subgroup size explicit. Per review by @NeoZhangJianyu on #22035.

Assisted by Claude.

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