atomic accesses

[Segher Boessenkool]

The Linux kernel, and probably some user-space applications and 
libraries
as well, depend on GCC guaranteeing (a variant of) the following:

	"any access to a naturally aligned scalar object in memory
	that is not a bit-field will be performed by a single machine
	instruction whenever possible"

and it seems the current compiler actually does work like this.

I propose we add this text to the GCC manual (where?), so at least they
are right if/when they blame us for breaking that promise :-)

Comments?  Flames?


Segher