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

via llvm-bugs llvm-bugs at lists.llvm.org
Mon Jan 28 08:25:34 PST 2019


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:

So now we have to dance around that to avoid infinite-looping reverse

This particular case should be fixed with:

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