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can help a lot of x86 code because x86 is 2-address and a64 is 3-address, so x86 ends up with piles of movs that end up dead after translation It's not a win across the board because our RA isn't aware of tied registers so sometimes we regress moves. But it's a win on average, and the RA bits can be improved with time. Signed-off-by: Alyssa Rosenzweig <alyssa@rosenzweig.io>