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[Bug c/63368] Provide an implementation for `__sync_val_compare_and_swap_8' on powerpc (32bits)


https://gcc.gnu.org/bugzilla/show_bug.cgi?id=63368

--- Comment #5 from Jonathan Wakely <redi at gcc dot gnu.org> ---
ppc32 doesn't have a 64-bit CAS instruction, so this would need to be done with
a global lock, not an atomic instruction.


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