[llvm-bugs] [Bug 39637] [X86] Failure to combine vpmovzxbw with a v16i16->v16i8 truncate implemented with extract+packuswb

[via llvm-bugs]

https://bugs.llvm.org/show_bug.cgi?id=39637

Simon Pilgrim <llvm-dev at redking.me.uk> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
         Resolution|---                         |FIXED
 Fixed By Commit(s)|                            |r354757
             Status|NEW                         |RESOLVED

--- Comment #2 from Simon Pilgrim <llvm-dev at redking.me.uk> ---
Fixed in rL354757

  zext(packus(x),packus(y)) -> concat(x,y)

I'm intending to generalize the solution in the future to combine zext with any
shuffle, but until combineX86ShufflesRecursively can handle vector ops of
different sizes this basic pattern is the most stable.

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