[llvm-bugs] [Bug 40434] [x86] shuffle lowering should try harder to match unpack

[via llvm-bugs]

https://bugs.llvm.org/show_bug.cgi?id=40434

Sanjay Patel <spatel+llvm at rotateright.com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
         Resolution|---                         |FIXED
             Status|NEW                         |RESOLVED
 Fixed By Commit(s)|                            |r352380

--- Comment #3 from Sanjay Patel <spatel+llvm at rotateright.com> ---
This turns out to be more complicated than I was imagining, and it's at least
partly my fault. :)

I added code to form 256-bit vperm with:
https://reviews.llvm.org/rL351346

So now we have to dance around that to avoid infinite-looping reverse
transforms:
https://reviews.llvm.org/rL352333

This particular case should be fixed with:
https://reviews.llvm.org/rL352380

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