基址比例变址寻址（Base Index Scale Addressing）

参考内容来自：https://docs.oracle.com/cd/E19120-01/open.solaris/817-5477/ennby/index.html

该寻址方式的形式为 offset(base, index, scale)

原文中这样描述

Memory references have the following syntax:segment:offset(base, index, scale).

• Segment is any of the x86 architecture segment
  registers. Segment is optional: if specified, it must be separated from offset by a colon (:). If segment is omitted, the value of %ds (the default segment register) is assumed.

  • segment是x86架构的任意一个段地址寄存器。segment参数是可选的（可以不指定）：如果指定了段寄存器，必须和偏移量之间有一个冒号。如果segment参数被省略，默认的段地址寄存器ds 就会被用于计算最终的地址。

• Offset is the displacement from segment of the desired memory value. Offset is optional.

  • offset是指从段起始地址到目标变量地址之间的偏移量。offset同样也是可选

• Base and index can be any of the general 32–bi