On Fri, 2013-11-01 at 18:30 +0200, Victor Kaplansky wrote:

"David Laight" [off-list ref] wrote on 11/01/2013 06:25:29 PM:

quoted

gcc will do unexpected memory accesses for bit fields that are
adjacent to volatile data.
In particular it may generate 64bit sized (and aligned) RMW cycles
when accessing bit fields.
And yes, this has caused real problems.

Thanks, I am aware about this bug/feature in gcc.

AFAIK, this has been fixed in 4.8 and 4.7.3 ... 

Cheers,
Ben.

-- Victor

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