On VAX systems, specifies the VAX general purpose registers %R0
    through %R11. On Alpha systems, specifies the Alpha integer
    registers %R0 through %R28. On I64 systems, specifies integer
    registers %R0 through %R127, as follows:

    Register
    Symbol         Definition

    %R0            General integer register 0
    %R1 (%GP)      Global Data Pointer
    %R2 . . . %R11 General integer registers 2 to 11
    %R12           Stack Pointer
    %R13           Thread Pointer
    %R14 . . .     General integer registers 14 to 24
    %R24
    %R25           Argument information
    %R26 . . .     General integer registers 26 to 127 (%R32 to %R127
    %R127          may or may not be allocated/active)

    Example:

    DBG> DEPOSIT %R1 = 23