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I'm trying to understand the following function.

void luaV_finishOp (lua_State *L)

The comments say it is to resume an instruction interrupted by a previous yield. In its implementation, there is a switch-case for a varieties of instruction types (ADD, SUB, etc.).

To my very limited understanding, I see only one possible code path being hit, that is, the OP_CALL. Because an execution is always interrupted by a call to coroutine.yield(). How come there are so many handling paths?

I think my understanding is quite limited so I must miss many things here. Just don't know what I missed. Thank you in advance.