[llvm-bugs] [Bug 38658] [X86] Failure to lower VSELECT on pre-SSE41 targets

[via llvm-bugs]

https://bugs.llvm.org/show_bug.cgi?id=38658

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

           What    |Removed                     |Added
----------------------------------------------------------------------------
         Resolution|---                         |FIXED
             Status|NEW                         |RESOLVED

--- Comment #4 from Simon Pilgrim <llvm-dev at redking.me.uk> ---
(In reply to Craig Topper from comment #3)
> I'm guessing LegalizeVectorOps was the one calling LowerShift. But
> LegalizeVectorOps, unlike LegalizeDAG, doesn't know how to legalize nodes
> created by Custom handlers. So the vselect stuck around after
> LegalizeVectorOps. And LegalizeDAG doesn't know what to do with vselect.

Yup that looks like what was happening, cheers. I've added the test case at
rL340393.

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