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Arm AArch64: Documentation updates (#9321)

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* Arm AArch64: Documentation updates

* Update docs/build.md to include information on how to enable the Arm optimized gemm/gemv kernels

* Update examples/quantize/README.md with information on the Q4_0_4_4, Q4_0_4_8 and Q4_0_8_8 formats

* Add newline to the end of docs/build.md
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Dan Johansson 2024-09-09 09:02:45 +02:00 • committed by GitHub
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@ -380,3 +380,9 @@ For detailed info, such as model/device supports, CANN install, please refer to
### Android
To read documentation for how to build on Android, [click here](./android.md)
### Arm CPU optimized mulmat kernels
Llama.cpp includes a set of optimized mulmat kernels for the Arm architecture, leveraging Arm® Neon™, int8mm and SVE instructions. These kernels are enabled at build time through the appropriate compiler cpu-type flags, such as `-DCMAKE_C_FLAGS=-march=armv8.2a+i8mm+sve`. Note that these optimized kernels require the model to be quantized into one of the formats: `Q4_0_4_4` (Arm Neon), `Q4_0_4_8` (int8mm) or `Q4_0_8_8` (SVE). The SVE mulmat kernel specifically requires a vector width of 256 bits. When running on devices with a different vector width, it is recommended to use the `Q4_0_4_8` (int8mm) or `Q4_0_4_4` (Arm Neon) formats for better performance. Refer to [examples/quantize/README.md](../examples/quantize/README.md) for more information on the quantization formats.
To support `Q4_0_4_4`, you must build with `GGML_NO_LLAMAFILE=1` (`make`) or `-DGGML_LLAMAFILE=OFF` (`cmake`).