First of all, you did silently ignore my second, upper town example. I don't know why, as it fits very well with your idea of "two operands" yet does not require order of execution/evaluation to be totally defined.

But the compiler can only do this, if the programmer can clearly indicate that there are no dependancies--and that requires that EO be defined.

Bogus. If the execution order is left undefined, the programmer can still clearly indicate the order by moving out the expressions into different statements. So this is no requirement for parallelization. In fact, it actually prevents parallelization, because the compiler/interpreter/CPU (generally) cannot determine if a function call will have side effects and thus must delay all further execution until the one function call has finished and produced the result.

In reply to Re^35: Why is the execution order of subexpressions undefined? (magic ruts) by Corion
in thread Why is the execution order of subexpressions undefined? by BrowserUk

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