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atomics: add the --disable-cx16-atomics #9023

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atomics: add the --disable-cx16-atomics #9023

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Commits on Jun 2, 2021

  1. atomics: add the --disable-cx16-atomics 

    Do not try the -mcx16 flag if --disable-cx16-atomics is used,
and prevent the generation of instructions that are not available
on all x86 platforms (such as Celeron N4000).

Always try to run a simple test to make sure the selected atomic
generate correct results.

Thanks Orion Poplawski for reporting this issue.

Refs. open-mpi#9022

Signed-off-by: Gilles Gouaillardet <gilles@rist.or.jp>
    @ggouaillardet
    ggouaillardet committed Jun 2, 2021
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