这个字段用于指定所有缓存机制在整个请求/响应链中必须服从的指令。
This field is used to specify directives that must be obeyed by all caching mechanisms along the request/response chain.
指令的其他位包含其他指令格式的一个或多个字段。
The remaining bits of the instruction contain one or more fields for the different instruction formats.
Vega处理器包含了一个客户化的读屏障指令，它具有字段检查元数据和针对GC压缩页面的特殊的虚拟内存保护。
Vega processors included a custom read barrier instruction that included bit field checking in reference metadata as well as special virtual memory protection for GC-compacted pages.
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