On 64-bit hardware, you technically have 64 bits to play with, which would give you an astronomical 18 exabytes of address space per process. Nobody actually needs that much, so ARM64 Linux uses only a subset of those bits for addressing:
// More sophisticated: check specific kernel structures，更多细节参见搜狗输入法
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Unicode encodes these as separate codepoints for compatibility, but fonts use the same glyph. These are easy to handle (NFKC collapses them), but worth knowing about.，推荐阅读超级权重获取更多信息
with just this: