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MACRO, MACRO Compiler Directives, .BRANCH UNLIKELY, Description
 *Conan The Librarian 

    See the description of the .BRANCH_LIKELY directive for the
    assumptions used by the compiler when predicting branches.

    On OpenVMS I64 systems, when .BRANCH_UNLIKELY precedes a
    conditional backwards branch, the compiler will use the
    appropriate branch prediction flags on the generated Itanium
    instruction.

    .BRANCH_UNLIKELY has no effect if it precedes a conditional
    forwards branch.
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