[LLVMbugs] [Bug 20778] New: AArch64: "Do not know how to scalarize this operator's operand!"

[bugzilla-daemon at llvm.org]

http://llvm.org/bugs/show_bug.cgi?id=20778

            Bug ID: 20778
           Summary: AArch64: "Do not know how to scalarize this operator's
                    operand!"
           Product: libraries
           Version: trunk
          Hardware: PC
                OS: All
            Status: NEW
          Severity: normal
          Priority: P
         Component: Backend: AArch64
          Assignee: unassignedbugs at nondot.org
          Reporter: grosbach at apple.com
                CC: llvmbugs at cs.uiuc.edu
    Classification: Unclassified

The following fails to compile for aarch64.

define void @autogen_SD27033() {                                                
BB:                                                                             
  %FC17 = sitofp <1 x i1> undef to <1 x double>                                 
  br label %CF80                                                                

CF80:                                             ; preds = %CF80, %BB          
  br i1 undef, label %CF80, label %CF79                                         

CF79:                                             ; preds = %CF79, %CF80        
  %Sl69 = select i1 undef, <1 x double> %FC17, <1 x double> undef               
  %Cmp70 = icmp ne i8 undef, undef                                              
  br i1 %Cmp70, label %CF79, label %CF82                                        

CF82:                                             ; preds = %CF79               
  ret void                                                                      
}

Found via llvm-stress.

$ llc -o - -mtriple=arm64-apple-darwin test.ll
ScalarizeVectorOperand Op #0: 0x7ffae9047250: v1f64 = sint_to_fp 0x7ffae9046460
[ORD=31] [ID=0]

Do not know how to scalarize this operator's operand!
UNREACHABLE executed at
/Users/grosbaj/sources/llvm/lib/CodeGen/SelectionDAG/LegalizeVectorTypes.cpp:403!
0  llc                      0x0000000106cac7be
llvm::sys::PrintStackTrace(__sFILE*) + 46
1  llc                      0x0000000106cacacb
PrintStackTraceSignalHandler(void*) + 27
2  llc                      0x0000000106cace8c SignalHandler(int) + 460
3  libsystem_platform.dylib 0x00007fff882fef1a _sigtramp + 26
4  llc                      0x0000000107656a9e guard variable for
llvm::BitcodeErrorCategory()::O + 69646
5  llc                      0x0000000106cacafb raise + 27
6  llc                      0x0000000106cacbb2 abort + 18
7  llc                      0x0000000106c2a696
llvm::llvm_unreachable_internal(char const*, char const*, unsigned int) + 198
8  llc                      0x0000000106a53bf3
llvm::DAGTypeLegalizer::ScalarizeVectorOperand(llvm::SDNode*, unsigned int) +
611
9  llc                      0x0000000106a303d6 llvm::DAGTypeLegalizer::run() +
1590
10 llc                      0x0000000106a360d2
llvm::SelectionDAG::LegalizeTypes() + 66
...

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