atomic_load

[Eric Botcazou]

> This is a silent and dangerous incorrect code generation issue.

Let's avoid this kind of FUD, please, builtins are low-level devices and 
people must know what they are doing and be prepared for caveats.

> If these functions are not meant to be used to exising
> data,  then at least the documentation needs to be changed
> and include a big warning that this only happens to work
> corectly if the data has  sufficient alignment for the
> specific architecture (which of course makes it impossible
> to use this in a portable way).

The last part of the sentence is again a blatant overstatement but I agree 
that the alignment caveat ought to be documented.  Please suggest a wording to 
that effect and post a patch onto the gcc-patches@ ML.  Thanks in advance.

-- 
Eric Botcazou