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This PR introduces the s390x binaries to be released in https://github.com/ggml-org/llama.cpp/releases.

We have to specify a suffix of z15 for now as the CI used is an IBM z15. IBM z16 and later systems can use the z15 binaries provided but will not get better performance improvements as the instruction set is not optimised for the newer systems.

We also unfortunately do not provide IBM zDNN backend binaries for now because it is only available on IBM z17 and later systems, which our CI is not at that hardware level yet.

@taronaeo taronaeo requested a review from slaren as a code owner October 18, 2025 07:16
@github-actions github-actions bot added the devops improvements to build systems and github actions label Oct 18, 2025
@taronaeo taronaeo requested a review from CISC October 19, 2025 09:57
@taronaeo taronaeo merged commit fcb235b into ggml-org:master Oct 19, 2025
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CISC commented Oct 19, 2025

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@taronaeo Needs fixing or revert/disable: https://github.com/ggml-org/llama.cpp/actions/runs/18629232454/job/53111541762#step:5:42

Saw it. Working on a fix, one moment.

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