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    SubjectRe: [PATCH] only use 48-bit lba when necessary
    Matt Mackall wrote:

    >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

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