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We now compile certain low-level Cmm functions in the RTS multiple times, with different levels of vector support. We then dispatch at runtime in the RTS, based on what instructions are supported. See Note [realArgRegsCover] in GHC.Cmm.CallConv. Fixes #25169 ------------------------- Metric Increase: T10421 T12425 T18730 T1969 T9198 -------------------------
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