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Add mask casting using From - #440
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Related to #439.
I implemented casting between masks with an equal number of lanes. This makes compatible mask conversions very easy for users. Example:
Under the hood, this is implemented using the existing
Simd::{combine,narrow,split,widen}_maskNxMon all platforms except AVX512 where same-lane-count mask conversion is trivial.The code in
fearless_simd_genis a bit out there, because I couldn't easily hook into existing systems .