gcc and 128-bit compare/exchange

[Achim Gratz]

Eliot Moss writes:
> What I am really reporting is that Cygwin is giving the pthread mutex form
> when it should not be.  My CPU clearly has the capability, and the compiler clearly
> knows how to emit the instruction, since the __sync form does it.  What is
> mysterious and tangled is why libatomic / libc are not delivering the desired
> version of the atomic compare-exchange function.

Assuming you want to use a library, it would have to detect this
capability at runtime (unless you force-build for a single CPU
architecture) and dispatch different code based on the result.  It's
probably the latter part that's missing on Cygwin.


Regards,
Achim.
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