powerpc64: Support outline-atomics for 128-bit atomics #90
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This is currently disabled by default mainly for compatibility with older versions of operating systems (can be enabled by `--cfg portable_atomic_outline_atomics`).
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Support native 128-bit atomics using dynamic detection on big-endian powerpc64 that supports CPUs older than pwr8 by default.
Run-time detection is currently supported on Linux and FreeBSD. I also have an implementation for AIX, but skip it for now as I don't yet have an environment where I can run tests. EDIT: opened #102
This is currently disabled by default mainly for compatibility with older versions of operating systems (can be enabled by
--cfg portable_atomic_outline_atomics).