b12418

ggml-cpu: add x86 VNNI Q2_0 dot product (#26348)

• ggml-cpu: use VNNI for Q2_0 dot products

Keep the upstream AVX2 unpacking, accumulation, and fallback. Use VNNI for the integer dot product on supported x86 CPUs.

Assisted-by: Codex

• ggml-cpu: use VBMI for Q2_0 unpacking

Use multishift to unpack Q2_0 weights on CPUs with AVX-512 VBMI and VL. Retain the existing shift-and-mask unpacking on other CPUs.

Assisted-by: Codex

• Update ggml/src/ggml-cpu/arch/x86/quants.c

Co-authored-by: Sigbjørn Skjæret sigbjorn.skjaeret@huggingface.co

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Co-authored-by: Sigbjørn Skjæret sigbjorn.skjaeret@huggingface.co

Website:

• https://llama.app

Attestations:

• https://github.com/ggml-org/llama.cpp/attestations/67818594

macOS/iOS:

• macOS Apple Silicon (arm64)
• macOS Apple Silicon (arm64, KleidiAI enabled) DISABLED
• macOS Intel (x64)
• iOS XCFramework

Linux:

• Ubuntu x64 (CPU)
• Ubuntu arm64 (CPU)
• Ubuntu 24.04 s390x (CPU)
• Ubuntu 26.04 s390x (CPU)
• Ubuntu 26.04 s390x (zDNN)
• Ubuntu x64 (Vulkan)
• Ubuntu arm64 (Vulkan)
• Ubuntu x64 (CUDA 12) - CUDA 12.8 libraries
• Ubuntu x64 (CUDA 13) - CUDA 13.5 libraries
• Ubuntu arm64 (CUDA 13) - CUDA 13.5 libraries
• Ubuntu x64 (ROCm 10.0)
• Ubuntu x64 (OpenVINO)
• Ubuntu x64 (SYCL FP32)
• Ubuntu x64 (SYCL FP16)
• Linux arm64 (Snapdragon: CPU, Adreno GPU, Hexagon NPU) - setup guide

Android:

• Android arm64 (CPU)
• Android arm64 (Snapdragon: CPU, Adreno GPU, Hexagon NPU) - setup guide

Windows:

• Windows x64 (CPU)
• Windows arm64 (CPU)
• Windows arm64 (OpenCL Adreno)
• Windows x64 (CUDA 12) - CUDA 12.4 DLLs
• Windows x64 (CUDA 13) - CUDA 13.5 DLLs
• Windows arm64 (CUDA 13) - CUDA 13.5 DLLs
• Windows x64 (Vulkan)
• Windows arm64 (Vulkan)
• Windows x64 (OpenVINO)
• Windows x64 (SYCL)
• Windows x64 (ROCm 10.0)

openEuler:

• DISABLED
• openEuler x86 (310p)
• openEuler x86 (910b, ACL Graph)
• openEuler aarch64 (310p)
• openEuler aarch64 (910b, ACL Graph)

UI:

• UI