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* metal: implement F16 Lightning Indexer - Implement GGML_OP_LIGHTNING_INDEXER for 128-dimensional, 64-head inputs with F32 queries and weights plus F16 keys and masks. - Add tiled and tail kernels and test KV lengths around 8- and 64-element boundaries. llama-bench (--mmap 1, -fa 1, -p 512, -n 128; d=0/10k/20k/30k): Before: - pp512: 153.73 ± 0.87 t/s - tg128: 8.91 ± 0.04 t/s - pp512 @ d10000: 73.90 ± 0.39 t/s - tg128 @ d10000: 8.66 ± 0.03 t/s - pp512 @ d20000: 45.83 ± 0.18 t/s - tg128 @ d20000: 8.26 ± 0.03 t/s - pp512 @ d30000: 33.40 ± 0.21 t/s - tg128 @ d30000: 7.94 ± 0.01 t/s After: - pp512: 155.19 ± 0.91 t/s - tg128: 8.95 ± 0.04 t/s - pp512 @ d10000: 86.95 ± 0.69 t/s - tg128 @ d10000: 9.00 ± 0.05 t/s - pp512 @ d20000: 62.01 ± 0.45 t/s - tg128 @ d20000: 8.68 ± 0.04 t/s - pp512 @ d30000: 49.18 ± 0.33 t/s - tg128 @ d30000: 8.60 ± 0.02 t/s Assisted-by: Codex * metal: stage Lightning Indexer K tiles - Stage and dequantize K in F16 threadgroup memory before simdgroup matrix loads. - Zero-fill partial tiles and guard stores so all KV segments use the same numerical path. - Support F32, F16, BF16, Q4_0, Q4_1, Q5_0, Q5_1, and Q8_0 K caches. llama-bench (--mmap 1, -fa on, -p 512, -n 128; d=0/10k/20k): - pp512: 160.38 +/- 1.01 t/s - tg128: 9.08 +/- 0.03 t/s - pp512 @ d10000: 88.37 +/- 0.46 t/s - tg128 @ d10000: 9.07 +/- 0.04 t/s - pp512 @ d20000: 62.53 +/- 0.46 t/s - tg128 @ d20000: 8.84 +/- 0.03 t/s Assisted-by: Codex * dedup Lightning Indexer constants, fix flaky test * cont : fix whitespace --------- Co-authored-by: forforever73 <690105611@qq.com> Co-authored-by: Georgi Gerganov <ggerganov@gmail.com>