llama.cpp Improves Prompt Processing Speed by Up to 31%

·2026.08.13 18:22

Key point

llama.cpp has improved prompt processing speed by up to 31% through vectorization using F16C intrinsics.

Details

The ggml_cpu_fp16_to_fp32 function has been optimized to utilize hardware F16C intrinsics such as AVX-512 and AVX2. This provides significantly faster performance compared to the previous software-based approach, ggml_fp16_to_fp32_row.

Actual test results confirmed performance improvements, with the Prompt Processing Rate increasing by approximately 17% to 31% for small models like qwen3:4b.

optimization ggml flash-attention llama-cpp inference-speed

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