Re: [PATCH] C undefined behavior fix

<< |        [#5] The least requirements on a  conforming  implementation
 |        are:
 |
 |          -- At  sequence points, volatile objects are stable in the
 |             sense  that  previous   accesses   are   complete   and
 |             subsequent accesses have not yet occurred.
>>

Note that this particular requirement is much laxer than that in the 
Ada standard, since it is specialized to sequence points, and would
appear to allow reordering of accesses between sequence points)