Simon Pilgrim abd314938d
[X86] Use GFNI for vXi8 shifts/rotates (#89115)
As detailed here: https://github.com/InstLatx64/InstLatX64_Demo/blob/master/GFNI_Demo.h

We can use the gf2p8affine instruction to lower byte shifts/rotates as well as the existing bitreverse case.

Based off the original patch here: https://reviews.llvm.org/D137026
2024-05-07 10:28:55 +01:00
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