[llvm-bugs] [Bug 46820] New: Assertion `(Ops[0].getValueType().getVectorElementCount() * Ops.size()) == VT.getVectorElementCount() & & "Incorrect element count in vector concatenation!"' failed

[via llvm-bugs]

https://bugs.llvm.org/show_bug.cgi?id=46820

            Bug ID: 46820
           Summary: Assertion
                    `(Ops[0].getValueType().getVectorElementCount() *
                    Ops.size()) == VT.getVectorElementCount() & &
                    "Incorrect element count in vector concatenation!"'
                    failed
           Product: libraries
           Version: trunk
          Hardware: PC
                OS: All
            Status: NEW
          Severity: enhancement
          Priority: P
         Component: Backend: X86
          Assignee: unassignedbugs at nondot.org
          Reporter: benny.kra at gmail.com
                CC: craig.topper at gmail.com, llvm-bugs at lists.llvm.org,
                    llvm-dev at redking.me.uk, spatel+llvm at rotateright.com

Created attachment 23767
  --> https://bugs.llvm.org/attachment.cgi?id=23767&action=edit
reduced test case

Seems to be an AVX512 issue

$ llc < bugpoint-reduced-simplified.ll
llc: llvm/lib/CodeGen/SelectionDAG/SelectionDAG.cpp:4340: llvm::SDValue
foldCONCAT_VECTORS(const llvm::SDLoc &, llv
m::EVT, ArrayRef<llvm::SDValue>, llvm::SelectionDAG &): Assertion
`(Ops[0].getValueType().getVectorElementCount() * Ops.size()) ==
VT.getVectorElementCount() &
& "Incorrect element count in vector concatenation!"' failed.

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