/sys$common/syshlp/HELPLIB.HLB  —  MACRO  /MIGRATION  MACRO Compiler Directives, .DEFINE PAL, Description
    By default, the compiler defines many Alpha PALcode instructions
    as built-ins. If you need to use an Alpha PALcode instruction
    that is not available as a compiler built-in, you must define the
    built-in yourself using the .DEFINE_PAL directive.
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