B.1.10. Qualifiers

An object that has a volatile-qualified type is accessed if any word or byte (or halfword on ARM architectures that have halfword support) of it is read or written. For volatile-qualified objects, reads and writes occur as directly implied by the source code, in the order implied by the source code.

The effect of accessing a volatile-qualified short is undefined on ARM architectures that do not have halfword support.

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