pengfei added a comment. Is inline assembly the only case `emms` instruction will be needed? But inline assembly doesn't enable `mmx` attribute automatically, right? E.g. https://godbolt.org/z/43ases Analyzing asm block and appending the `mmx` attribute if we see `mmx` instructions might be needed. But if we do the analysis, just adding an `emms` instruction at the end of the block seems better.
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