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      1 ; RUN: llc -mtriple mips64-unknown-freebsd12.0 -relocation-model pic -mcpu=mips4 -target-abi n64 -O2 -verify-machineinstrs -o - %s
      2 
      3 ; Test that the long branch pass does not crash due to the control flow
      4 ; optimizer producing malformed basic block operands due to the backend
      5 ; failing to handle debug information around branch instructions.
      6 
      7 define void @f() !dbg !5 {
      8 entry:
      9   %cmp = icmp eq i32 undef, 0, !dbg !16
     10   %conv = zext i1 %cmp to i32, !dbg !16
     11   tail call void @llvm.dbg.value(metadata i32 %conv, metadata !11, metadata !DIExpression()), !dbg !17
     12   %tobool = icmp eq i32 undef, 0, !dbg !18
     13   br i1 %tobool, label %if.end, label %cleanup7.critedge, !dbg !21
     14 
     15 if.end:                                           ; preds = %entry
     16   %call6 = call i32 bitcast (i32 (...)* @j to i32 (i32)*)(i32 signext %conv)
     17 #4, !dbg !22
     18   br label %cleanup7, !dbg !23
     19 
     20 cleanup7.critedge:                                ; preds = %entry
     21   call void @llvm.lifetime.end.p0i8(i64 4, i8* nonnull undef) #4, !dbg !24
     22   br label %cleanup7
     23 
     24 cleanup7:                                         ; preds = %cleanup7.critedge,
     25   ret void
     26 }
     27 
     28 declare void @llvm.lifetime.end.p0i8(i64, i8* nocapture) #1
     29 
     30 declare i32 @j(...)
     31 
     32 declare void @llvm.dbg.value(metadata, metadata, metadata) #3
     33 attributes #1 = { argmemonly nounwind }
     34 attributes #3 = { nounwind readnone speculatable }
     35 attributes #4 = { nounwind }
     36 
     37 !llvm.dbg.cu = !{!0}
     38 !llvm.module.flags = !{!3, !4}
     39 
     40 !0 = distinct !DICompileUnit(language: DW_LANG_C99, file: !1, producer: "clang
     41 version 6.0.0", isOptimized: true, runtimeVersion:
     42 0, emissionKind: FullDebug, enums: !2)
     43 !1 = !DIFile(filename:
     44 "/tmp//<stdin>", directory:
     45 "/tmp/")
     46 !2 = !{}
     47 !3 = !{i32 2, !"Debug Info Version", i32 3}
     48 !4 = !{i32 7, !"PIC Level", i32 2}
     49 !5 = distinct !DISubprogram(name: "f", scope: !6, file: !6, line: 8, type: !7,
     50 isLocal: false, isDefinition: true, scopeLine: 8, isOptimized: true, unit: !0,
     51 retainedNodes: !10)
     52 !6 = !DIFile(filename:
     53 "/tmp/test.c",
     54 directory: "/tmp")
     55 !7 = !DISubroutineType(types: !8)
     56 !8 = !{!9}
     57 !9 = !DIBasicType(name: "int", size: 32, encoding: DW_ATE_signed)
     58 !10 = !{!11, !12, !14}
     59 !11 = !DILocalVariable(name: "e", scope: !5, file: !6, line: 9, type: !9)
     60 !12 = !DILocalVariable(name: "g", scope: !13, file: !6, line: 11, type: !9)
     61 !13 = distinct !DILexicalBlock(scope: !5, file: !6, line: 10, column: 3)
     62 !14 = !DILocalVariable(name: "d", scope: !13, file: !6, line: 12, type: !15)
     63 !15 = !DIDerivedType(tag: DW_TAG_typedef, name: "a", file: !6, line: 2,
     64 baseType: !9)
     65 !16 = !DILocation(line: 9, column: 15, scope: !5)
     66 !17 = !DILocation(line: 9, column: 7, scope: !5)
     67 !18 = !DILocation(line: 12, column: 5, scope: !19)
     68 !19 = distinct !DILexicalBlock(scope: !20, file: !6, line: 12, column: 5)
     69 !20 = distinct !DILexicalBlock(scope: !5, file: !6, line: 10, column: 3)
     70 !21 = !DILocation(line: 12, column: 5, scope: !20)
     71 !22 = !DILocation(line: 16, column: 3, scope: !5)
     72 !23 = !DILocation(line: 17, column: 1, scope: !5)
     73 !24 = !DILocation(line: 15, column: 3, scope: !5)
     74