>FYI, GCC as of 3.2.3 doesn't yet reduce the if(...) form to branchless
>code but the & and && versions come out the same with -O2.
The operands of & can be evaluated in any order, while && requires
left-to-right and does not evaluate the right operand if the left one
is false. Only the simplest cases could possibly generate the same
code.
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