The LuaJIT NYI That Silently Poisoned an

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The LuaJIT NYI That Silently Poisoned an Unrelated Hot Loop

I was optimizing the Lua transpiler for my modding language grug and ran into a really weird LuaJIT performance bug. The same benchmark could randomly run **20× slower**, and it turned out a LuaJIT NYI (Not Yet Implemented) could silently blacklist an unrelated hot loop.

I wrote up the investigation here.

It goes from the benchmark mystery through LuaJIT's trace recorder internals, and ends with a PR to get unpack off LuaJIT's NYI list. Feedback is very welcome! :)
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The LuaJIT NYI That Silently Poisoned an Unrelated Hot Loop - StreamHPC

A LuaJIT NYI silently blacklisted an unrelated hot loop, causing a 20× slowdown. Here's how we tracked it down and now catch it in CI.

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