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The {{volatile}} keyword eliminates this confusion by imposing restrictions on access and caching. According to the C99 Rationale \[[ISO/IEC 03|AA. C References#ISO/IEC 03]\]: |
No cacheing through this lvalue: each operation in the abstract semantics must be performed (that is, no cacheing assumptions may be made, since the location is not guaranteed to contain any previous value). In the absence of this qualifier, the contents of the designated location may be assumed to be unchanged except for possible aliasing.
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