[Bug 86997] non-portable x86/x86_64 inline assembly

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=86997

--- Comment #1 from Timo Teräs <timo.teras at iki.fi> ---
Seems that memory barrier is the only thing needed. Consider using compiler
built-ins when possible.

See:
http://en.wikipedia.org/wiki/Memory_ordering#Compiler_support_for_hardware_memory_barriers

So with gcc>=4.4 __sync_synchronize() would be preferred.

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