Library /sys$common/syshlp/DBG$HELP.HLB  —  DEBUG  Built in Symbols, %PRED
    On I64 systems, specifies a 64-bit predicate collection register,
    PRED, representing predicate registers P0 through P63. Individual
    predicate registers can be examined using the syntax in the
    following example:

    PRn,1,0

    where n is the predicate register number
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