[LLVMbugs] [Bug 1304] NEW: "extractelement" doesn't work for <1 x i64> type

[bugzilla-daemon at cs.uiuc.edu]

http://llvm.org/bugs/show_bug.cgi?id=1304

           Summary: "extractelement" doesn't work for <1 x i64> type
           Product: libraries
           Version: trunk
          Platform: Macintosh
        OS/Version: MacOS X
            Status: NEW
          Severity: normal
          Priority: P2
         Component: Backend: X86
        AssignedTo: unassignedbugs at nondot.org
        ReportedBy: isanbard at gmail.com


For this program:

$ cat b.ll
define i64 @bork(<2 x i64> %vec) {
entry:
  %tmp = extractelement <2 x i64> %vec, i32 0
  ret i64 %tmp
}

I get this abort:

$ llvm-as -f b.ll
$ opt -std-compile-opts -o a.bc -f b.bc
/Users/wendling/llvm/llvm.src/lib/Transforms/Scalar/InstructionCombining.cpp:1399: failed assertion 
`DemandedElts != EltMask && (DemandedElts & ~EltMask) == 0 && "Invalid DemandedElts!"'
Abort trap

If it's more than 1 element in the vector, you get the failure reported in PR1303.



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