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ExtrudeGeometry（挤压几何体）：
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580 DES_SR TST_DES_SIMPLE PTSAV1 DLY SPTR ; save test constant 0x10; set DS pointer，详情可参考WPS官方版本下载
The main rule for data access is max(CPL, RPL) ≤ DPL. For code transfers, the rules get considerably more complex -- conforming segments, call gates, and interrupt gates each have different privilege and state validation logic. If all these checks were done in microcode, each segment load would need a cascade of conditional branches: is it a code or data segment? Is the segment present? Is it conforming? Is the RPL valid? Is the DPL valid? This would greatly bloat the microcode ROM and add cycles to every protected-mode operation.