SYCL: optimized repeat_back kernel (3× fewer asm instructions, 2× faster)Feature/sycl repeat back opt#16869
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NeoZhangJianyu merged 9 commits intoggml-org:masterfrom Nov 3, 2025
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Removed comments to clean up the code.
Remove unnecessary blank line before assigning acc to dst_dd.
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NeoZhangJianyu
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It's good job!
Thank you!
gabe-l-hart
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Nov 3, 2025
* origin/master: (169 commits) opencl: support imrope (ggml-org#16914) fix: Viewing multiple PDF attachments (ggml-org#16974) model-conversion : pass config to from_pretrained (ggml-org#16963) server : add props.model_alias (ggml-org#16943) ggml: CUDA: add head size 72 for flash-attn (ggml-org#16962) mtmd: add --image-min/max-tokens (ggml-org#16921) mtmd: pad mask for qwen2.5vl (ggml-org#16954) ggml : LoongArch fixes (ggml-org#16958) sync: minja (glm 4.6 & minmax m2 templates) (ggml-org#16949) SYCL: optimized repeat_back kernel (3× fewer asm instructions, 2× faster)Feature/sycl repeat back opt (ggml-org#16869) feat(webui): improve LaTeX rendering with currency detection (ggml-org#16508) test-backend-ops : fix segfault in moe-expert-reduce test in support mode and coverage (ggml-org#16936) ci : disable failing riscv cross build (ggml-org#16952) model: add Janus Pro for image understanding (ggml-org#16906) clip : use FA (ggml-org#16837) server : support unified cache across slots (ggml-org#16736) common : move gpt-oss reasoning processing to init params (ggml-org#16937) docs: remove llama_sampler_accept reference in sampling sample usage (ggml-org#16920) CUDA: add FLOOR, CEIL, ROUND, TRUNC unary ops (ggml-org#16917) devops: fix failing s390x docker build (ggml-org#16918) ...
Anico2
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…ter)Feature/sycl repeat back opt (ggml-org#16869) * SYCL repeat_back v1 — add core op + switch case * Implement repeat_back SYCL operation and minor fixes * SYCL: optimize repeat_back kernel * Remove Hebrew comment from repeat_back.cpp * Remove comments for code clarity Removed comments to clean up the code. * Fix formatting in ggml-sycl.cpp * Formatted lambda according to legacy style. No logic changes * Remove blank line in repeat_back.cpp Remove unnecessary blank line before assigning acc to dst_dd.
blime4
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Feb 5, 2026
…ter)Feature/sycl repeat back opt (#16869) * SYCL repeat_back v1 — add core op + switch case * Implement repeat_back SYCL operation and minor fixes * SYCL: optimize repeat_back kernel * Remove Hebrew comment from repeat_back.cpp * Remove comments for code clarity Removed comments to clean up the code. * Fix formatting in ggml-sycl.cpp * Formatted lambda according to legacy style. No logic changes * Remove blank line in repeat_back.cpp Remove unnecessary blank line before assigning acc to dst_dd.
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Summary
This PR replaces the previous SYCL implementation of REPEAT_BACK that I implemented in PR #16734.
The functionality remains identical, but the kernel is now significantly more efficient.
Changes
ggml-sycl/repeat_back.cppwith a vectorized and cache-friendly kernelPerformance
Testing
test-backend-ops -o REPEAT_BACKtests pass on SYCLCompatibility