[LLVMbugs] [Bug 11769] New: AVX codegen crash

[bugzilla-daemon at llvm.org]

http://llvm.org/bugs/show_bug.cgi?id=11769

             Bug #: 11769
           Summary: AVX codegen crash
           Product: libraries
           Version: trunk
          Platform: PC
        OS/Version: Windows NT
            Status: NEW
          Severity: enhancement
          Priority: P
         Component: Backend: X86
        AssignedTo: unassignedbugs at nondot.org
        ReportedBy: nadav.rotem at intel.com
                CC: llvmbugs at cs.uiuc.edu
    Classification: Unclassified


Created attachment 7884
  --> http://llvm.org/bugs/attachment.cgi?id=7884
Reproducer

The attached test crashes when compiled with -matter=+avx.  The problem is that
LowerVECTOR_SHUFFLE decides to give up on the lowering on a certain
vectorshuffle instruction because it believes that the DAGCombiner would catch
this pattern. I think that the pattern is (extract(shufflevector(load))). When
the dagcombiner fails to remove this pattern, we fail with 'unable to select
pattern'.

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