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Standard C Implementation Definition
Otherwise, reads and writes to volatile qualified objects occur as directly implied by the
source code, in the order implied by the source code.
B.1.11
Expression evaluation
The compiler can re-order expressions involving only associative and commutative
operators of equal precedence, even in the presence of parentheses. For example, a + (b
+ c) might be evaluated as (a + b) + c if a, b, and c are integer expressions.
Between sequence points, t
he compiler can evaluate expressions in any order, regardless of parentheses. Therefore,
side effects of expressions between sequence points can occur in any order.
The compiler can evaluate function arguments in any order.
Any aspect of evaluation order not prescribed by the relevant standard can be varied by:
• the optimization level you are compiling at
• the release of the compiler you are using.
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