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arm64: optimize q6_k_q8_k kernel with i8mm (#13519)

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This PR improves q6_k_q8_k gemm kernel with arm64 i8mm instruction.

Tested on neoverse-n2 with llama3 8b q6_k quantization model.
- 40% ~ 54% S_PP uplift for all batch sizes
- 16% ~ 47% 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-Q6_K.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 |    78.52 |   109.18 |    18.63 |    18.88 |
|   128 |    128 |    2 |    84.62 |   123.94 |    34.54 |    36.92 |
|   128 |    128 |    4 |    84.36 |   122.49 |    52.65 |    61.32 |
|   128 |    128 |    8 |    90.52 |   138.87 |    63.46 |    84.41 |
|   128 |    128 |   16 |    90.11 |   138.56 |    71.04 |   101.33 |
|   128 |    128 |   32 |    89.81 |   137.79 |    75.14 |   110.47 |
---------------------------------------------------------------------
```
This commit is contained in:
Yibo Cai
2025-05-15 03:53:52 +08:00
committed by GitHub
parent 3198405e98
commit 5ab5d5fb25
2 changed files with 199 additions and 0 deletions
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4
ggml/src/ggml-cpu/ggml-cpu.c
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@ -282,7 +282,11 @@ static const struct ggml_type_traits_cpu type_traits_cpu[GGML_TYPE_COUNT] = {
.from_float = quantize_row_q6_K,
.vec_dot = ggml_vec_dot_q6_K_q8_K,
.vec_dot_type = GGML_TYPE_Q8_K,
#if defined (__ARM_FEATURE_MATMUL_INT8)
.nrows = 2,
#else
.nrows = 1,
#endif
},
[GGML_TYPE_IQ2_XXS] = {
.from_float = NULL,