Stefan Krah <ste...@bytereef.org> added the comment:

This is a performance sensitive function, so I prefer not to add
volatile. MSVC also had a bug with that function, but only in PGO
mode. Microsoft has fixed the issue long ago.

Do newer gcc versions have this issue?

I'm fine with wrapping the entire macro in an #ifdef for __ppc64__.

Who is using this platform? IBM Power9?

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