> If you don't mind my asking, how is this made safe? Is it some form of > speculation? > Misc. registers refer to non-speculative system state, so any instruction that is going to change these is typically marked with a Serializing or IsNonSpeculative flag.
The CPU Models can then treat these type of instructions appropriately. For the O3, I think it will wait to the instruction reaches the head of the ROB to eventually execute and commit it. Can you track the path of that instruction in O3 to confirm that? -- - Korey
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