[llvm-bugs] [Bug 47534] New: Big shuffle crashes X86 backend

[via llvm-bugs]

https://bugs.llvm.org/show_bug.cgi?id=47534

            Bug ID: 47534
           Summary: Big shuffle crashes X86 backend
           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 23964
  --> https://bugs.llvm.org/attachment.cgi?id=23964&action=edit
reduced test case

$ llc < bugpoint-reduced-simplified.ll -mcpu=skylake-avx512
llc: llvm/lib/Target/X86/X86ISelLowering.cpp:10987: unsigned int
getV4X86ShuffleImm(ArrayRef<int>): Assertion `Mask[1] >= -1 && Mask[1] < 4 &&
"Out of bound mask element!"' failed.

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