You can use certain arguments to these directives to indicate
    register sets. You express a register set by listing the
    registers, separated by commas, within angle brackets. For
    example:

    <R1,R2,R3>

    If only one register is in the set, no angle brackets are needed.
    For example:

    R1

  Additional Information (explode) :

• .BRANCH LIKELY
• .BRANCH UNLIKELY
• .CALL ENTRY
• .CALL LINKAGE
• .DEFINE LINKAGE
• .DISABLE
• .ENABLE
• .GLOBAL LABEL
• .JSB ENTRY
• .JSB32 ENTRY
• .PRESERVE
• .SET REGISTERS
• .SYMBOL ALIGNMENT
• .USE LINKAGE