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Backport AVX512 SH-broadcast support to Clang 18#25233

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boegel merged 1 commit intoeasybuilders:developfrom
Flamefire:clang-avx512
Feb 16, 2026
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Backport AVX512 SH-broadcast support to Clang 18#25233
boegel merged 1 commit intoeasybuilders:developfrom
Flamefire:clang-avx512

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@Flamefire Flamefire commented Feb 6, 2026

When targetting AVX-512 CPUs like Intel Sapphire Rapids compilation may fail with:

UNREACHABLE executed at /dev/shm/Clang/18.1.8/GCCcore-13.3.0-CUDA-12.6.0/llvm-project-18.1.8.src/llvm/lib/Target/X86/X86InstrInfo.cpp:8220!

Backport 2 commits from Clang 19.1.0 to resolve.

@github-actions github-actions Bot added 2024a issues & PRs related to 2024a common toolchains change labels Feb 6, 2026
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Backport AVX512 SH-broadcast support to Clang 18
f172da4 
When targetting AVX-512 CPUs like Intel Sapphire Rapids compilation may fail with:

> UNREACHABLE executed at /dev/shm/Clang/18.1.8/GCCcore-13.3.0-CUDA-12.6.0/llvm-project-18.1.8.src/llvm/lib/Target/X86/X86InstrInfo.cpp:8220!

Backport 2 commits from Clang 19.1.0 to resolve.
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Flamefire commented Feb 7, 2026

Test report by @Flamefire
SUCCESS
Build succeeded for 3 out of 3 (total: 3 hours 24 mins 6 secs) (3 easyconfigs in total)
n1407.barnard.hpc.tu-dresden.de - Linux RHEL 9.6, x86_64, Intel(R) Xeon(R) Platinum 8470 (sapphirerapids), Python 3.9.21
See https://gist.github.com/Flamefire/09d773df4c834ba9a7a87ea88f593caa for a full test report.

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Thyre commented Feb 9, 2026

@boegelbot please test @ jsc-zen3
EB_ARGS="--installpath /tmp/$USER/ecpr-25233"

@Thyre Thyre added bug fix and removed change labels Feb 9, 2026
@Thyre Thyre added this to the next release (5.2.1?) milestone Feb 9, 2026
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boegelbot commented Feb 9, 2026

@Thyre: Request for testing this PR well received on jsczen3l1.int.jsc-zen3.fz-juelich.de

PR test command 'if [[ develop != 'develop' ]]; then EB_BRANCH=develop ./easybuild_develop.sh 2> /dev/null 1>&2; EB_PREFIX=/home/boegelbot/easybuild/develop source init_env_easybuild_develop.sh; fi; EB_PR=25233 EB_ARGS="--installpath /tmp/$USER/ecpr-25233" EB_CONTAINER= EB_REPO=easybuild-easyconfigs EB_BRANCH=develop /opt/software/slurm/bin/sbatch --job-name test_PR_25233 --ntasks=8 ~/boegelbot/eb_from_pr_upload_jsc-zen3.sh' executed!

  • exit code: 0
  • output:
Submitted batch job 9606

Test results coming soon (I hope)...

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boegelbot commented Feb 9, 2026

Test report by @boegelbot
SUCCESS
Build succeeded for 3 out of 3 (total: 12 hours 41 mins 10 secs) (3 easyconfigs in total)
jsczen3c1.int.jsc-zen3.fz-juelich.de - Linux Rocky Linux 9.7, x86_64, AMD EPYC-Milan Processor (zen3), Python 3.9.23
See https://gist.github.com/boegelbot/598835a12da29739afb5aa9fea14ad6e for a full test report.

boegel
boegel approved these changes Feb 16, 2026
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lgtm

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boegel commented Feb 16, 2026

Going in, thanks @Flamefire!

@boegel boegel merged commit b20523b into easybuilders:develop Feb 16, 2026
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@Flamefire Flamefire deleted the clang-avx512 branch February 16, 2026 11:49
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