arm64: optimize q4_k_q8_k kernel with i8mm #13886
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This PR improves q4_k_q8_k gemm kernel with arm64 i8mm instruction.
Tested on neoverse-n2 with llama3 8b q4_k_m quantization model.
- 34% ~ 50% S_PP uplift for all batch sizes
- 12% ~ 37% S_TG uplift for batch size 4 and above
Perplexity doesn't change with this PR.
```
// tested on neoverse-n2
$ llama-batched-bench \
-m Meta-Llama-3-8B-Instruct-Q4_K_M.gguf \
--no-mmap -fa \
-c 8192 -b 4096 -ub 512 -npp 128 -ntg 128 \
-npl 1,2,4,8,16,32 \
-t 64
---------------------------------------------------------------------
| PP | TG | B | S_PP t/s | S_TG t/s |
| | | | original | this pr | original | this pr |
|-------|--------|------|----------|----------|----------|----------|
| 128 | 128 | 1 | 110.12 | 147.83 | 24.36 | 24.28 |
| 128 | 128 | 2 | 121.16 | 172.42 | 46.36 | 47.93 |
| 128 | 128 | 4 | 120.15 | 169.75 | 74.68 | 84.00 |
| 128 | 128 | 8 | 130.97 | 196.81 | 91.04 | 114.74 |
| 128 | 128 | 16 | 131.01 | 196.88 | 101.43 | 135.79 |
| 128 | 128 | 32 | 130.85 | 196.51 | 106.97 | 147.29 |
---------------------------------------------------------------------
```
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This PR improves q4_k_q8_k gemm kernel with arm64 i8mm instruction.
Tested on neoverse-n2 with llama3 8b q4_k_m quantization model.
Perplexity doesn't change with this PR.
Make sure to read the contributing guidelines before submitting a PR