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      1 ; Test DBG_LABEL MachineInstr for label debugging.
      2 ; REQUIRES: asserts
      3 ; RUN: llc -fast-isel=false -debug-only=isel %s -o /dev/null 2> %t.debug
      4 ; RUN: cat %t.debug | FileCheck %s --check-prefix=CHECKMI
      5 ;
      6 ; CHECKMI: DBG_LABEL "top", debug-location !9
      7 ; CHECKMI: DBG_LABEL "done", debug-location !11
      8 ;
      9 ; RUN: llc -fast-isel=false %s -o - | FileCheck %s --check-prefix=CHECKASM
     10 ;
     11 ; CHECKASM: DEBUG_LABEL: foo:top
     12 ; CHECKASM: DEBUG_LABEL: foo:done
     13 
     14 source_filename = "debug-label-mi.c"
     15 
     16 ; Function Attrs: noinline nounwind optnone
     17 define i32 @foo(i32 signext %a, i32 signext %b) #0 !dbg !4 {
     18 entry:
     19   %a.addr = alloca i32, align 4
     20   %b.addr = alloca i32, align 4
     21   %sum = alloca i32, align 4
     22   store i32 %a, i32* %a.addr, align 4
     23   store i32 %b, i32* %b.addr, align 4
     24   br label %top
     25 
     26 top:                                              ; preds = %entry
     27   call void @llvm.dbg.label(metadata !8), !dbg !9
     28   %0 = load i32, i32* %a.addr, align 4
     29   %1 = load i32, i32* %b.addr, align 4
     30   %add = add nsw i32 %0, %1
     31   store i32 %add, i32* %sum, align 4
     32   br label %done
     33 
     34 done:                                             ; preds = %top
     35   call void @llvm.dbg.label(metadata !10), !dbg !11
     36   %2 = load i32, i32* %sum, align 4
     37   ret i32 %2
     38 }
     39 
     40 ; Function Attrs: nounwind readnone speculatable
     41 declare void @llvm.dbg.label(metadata)
     42 
     43 attributes #0 = { noinline nounwind optnone uwtable }
     44 
     45 !llvm.dbg.cu = !{!0}
     46 !llvm.module.flags = !{!3}
     47 
     48 !0 = distinct !DICompileUnit(language: DW_LANG_C99, file: !1, isOptimized: false, emissionKind: FullDebug, enums: !2)
     49 !1 = !DIFile(filename: "debug-label-mi.c", directory: "./")
     50 !2 = !{}
     51 !3 = !{i32 2, !"Debug Info Version", i32 3}
     52 !4 = distinct !DISubprogram(name: "foo", scope: !1, file: !1, line: 1, type: !5, isLocal: false, isDefinition: true, scopeLine: 2, isOptimized: false, unit: !0, retainedNodes: !2)
     53 !5 = !DISubroutineType(types: !6)
     54 !6 = !{!7, !7, !7}
     55 !7 = !DIBasicType(name: "int", size: 32, encoding: DW_ATE_signed)
     56 !8 = !DILabel(scope: !4, name: "top", file: !1, line: 4)
     57 !9 = !DILocation(line: 4, column: 1, scope: !4)
     58 !10 = !DILabel(scope: !4, name: "done", file: !1, line: 7)
     59 !11 = !DILocation(line: 7, column: 1, scope: !4)
     60