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=
    Assignment:  The value on the right is assigned to the object on the
    left.

+=
    Additive assignment:  The value of the object on the left is augmented
    by the value on the right.

-=
    Subtractive assignment:  The value of the object on the left is reduced
    by the value on the right.

*=
    Multiplicative assignment:  The value of the object on the left is
    multiplied by the value on the right.

/=
    Division assignment:  The value of the object on the left is divided by
    the value on the right.

%=
    Modulus assignment:  The object on the left is updated with
    MOD(left,right).  The result is the remainder when the value of the
    object on the left is divided by the value on the right.

&=
    Bit-wise AND:  The bits in the object on the left are ANDed with the
    bits of the value on the right.

|=
    Bit-wise inclusive OR:  The bits in the object on the left are ORed with
    the bits of the value on the right.

=
    Bit-wise exclusive OR:  The bits in the object on the left are
    exclusively ORed with the bits of the value on the right.

<<=
    Left shift:  The bits in the object on the left are shifted to the left
    by the amount of the value on the right.

>>=
    Right shift:  The bits in the object on the left are shifted to the
    right by the amount of the value on the right.  If the object on the
    left is described as unsigned, the vacated high-order bits are zeroed.
     If the object on the left is described as signed, the sign bit is
    propagated through the vacated high-order bits.  The debugger treats
    registers as unsigned items.