The `LOAD_ATTR_INSTANCE_VALUE` instruction can be sped up by storing the offset of the `valid` field in the cache.

LOAD_ATTR_INSTANCE_VALUE needs to check the validity of the objects embedded values array.
Currently, it does that by computing the offset of the valid byte.
Instead we could store the offset in the inline cache as LOAD_ATTR_INSTANCE_VALUE has several inline cache entries to spare.

The check is done in the _CHECK_MANAGED_OBJECT_HAS_VALUES uop.

Linked PRs

• gh-153122

从 CPython 的解释器实现中的 LOAD_ATTR_INSTANCE_VALUE 指令和 _CHECK_MANAGED_OBJECT_HAS_VALUES uop 开始。检查该指令的内联缓存条目是如何定义的，以及有效性字节的偏移量当前是如何计算的。当偏移量存储在一个可用的内联缓存条目中，并且有效性检查使用该偏移量，同时相关测试和基准测试仍然通过时，即视为完成。