[LLVMbugs] [Bug 11749] New: [AVX2] Assertion hits with i64-based shufflevector in X86ISelLowering.cpp

[bugzilla-daemon at llvm.org]

http://llvm.org/bugs/show_bug.cgi?id=11749

             Bug #: 11749
           Summary: [AVX2] Assertion hits with i64-based shufflevector in
                    X86ISelLowering.cpp
           Product: new-bugs
           Version: trunk
          Platform: PC
        OS/Version: All
            Status: NEW
          Severity: enhancement
          Priority: P
         Component: new bugs
        AssignedTo: unassignedbugs at nondot.org
        ReportedBy: matt at pharr.org
                CC: llvmbugs at cs.uiuc.edu
    Classification: Unclassified


Created attachment 7864
  --> http://llvm.org/bugs/attachment.cgi?id=7864
test case

When the attached test case is compiled with llc -mattr=+avx2, the following
assertion hits:

Assertion failed: ((VT.is128BitVector() || VT.is256BitVector()) && "Unsupported
vector type for horizontal add/sub"), function isHorizontalBinOp, file
X86ISelLowering.cpp, line 14255.

(This assertion doesn't hit with -mattr=+avx).

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