Which system architecture is mentioned that uses a limit register for segmentation?

The correct answer involves understanding the structures of different CPU architectures and how they manage memory. The ARMv8 architecture, particularly in its implementation of segmentation, utilizes a limit register to define the bounds of a segment. This limit register indicates the maximum addressable limit of a segment, ensuring that any access to memory outside this defined segment is prohibited, which is essential for maintaining process isolation and protecting memory.

In contrast, other architectures like x86, PowerPC, and MIPS may implement memory management differently. For instance, while x86 does support segmentation, it primarily uses a more complex model that includes segment selectors and descriptor tables. MIPS and PowerPC architectures typically rely on paging rather than segmentation, which further differentiates how they handle memory segmentation and bounds checking. Understanding this distinction is crucial in recognizing how memory safety and organization are handled across various architectures.