When referring to registers in assembly language, the names are not case-sensitive. It does not apply to a piece of assembly code calling an arbitrary piece of assembly code; there are no restrictions in this case. In addition to supporting referring to memory regions by labels i. Similarly, since local variables are allocated after the base pointer is set, they always reside above the base pointer i. The number of bits to shift is specified by the second operand, which can be either an 8-bit constant or the register CL.
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