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      1 ; RUN: llc -filetype=obj -o - %s | llvm-dwarfdump --name cntrl_flags - | FileCheck %s
      2 ; CHECK: DW_OP_reg0 W0
      3 ;
      4 ; void use(unsigned char);
      5 ; f(unsigned long long cntrl_flags,
      6 ;                           int page_count)
      7 ; {
      8 ;         unsigned char tag;
      9 ;         tag = (((cntrl_flags) >> 32) & 0xFF);
     10 ;         use(tag);
     11 ; }
     12 
     13 source_filename = "test.i"
     14 target datalayout = "e-m:o-i64:64-i128:128-n32:64-S128"
     15 target triple = "arm64-apple-ios5.0.0"
     16 
     17 ; Function Attrs: nounwind ssp uwtable
     18 define i32 @f(i64 %cntrl_flags) local_unnamed_addr #0 !dbg !8 {
     19 entry:
     20   tail call void @llvm.dbg.value(metadata i64 %cntrl_flags, metadata !14, metadata !DIExpression()), !dbg !18
     21   %shr = lshr i64 %cntrl_flags, 32, !dbg !20
     22   %conv = trunc i64 %shr to i8, !dbg !21
     23   tail call void @llvm.dbg.value(metadata i8 %conv, metadata !16, metadata !DIExpression()), !dbg !22
     24   tail call void @use(i8 zeroext %conv) #3, !dbg !23
     25   ret i32 undef, !dbg !24
     26 }
     27 
     28 declare void @use(i8 zeroext) local_unnamed_addr 
     29 
     30 ; Function Attrs: nounwind readnone speculatable
     31 declare void @llvm.dbg.value(metadata, metadata, metadata) #2
     32 
     33 attributes #0 = { nounwind ssp uwtable }
     34 attributes #2 = { nounwind readnone speculatable }
     35 attributes #3 = { nobuiltin nounwind }
     36 
     37 !llvm.dbg.cu = !{!0}
     38 !llvm.module.flags = !{!3, !4, !5, !6}
     39 !llvm.ident = !{!7}
     40 
     41 !0 = distinct !DICompileUnit(language: DW_LANG_C99, file: !1, producer: "clang version 6.0.0 (trunk 317700) (llvm/trunk 317708)", isOptimized: true, runtimeVersion: 0, emissionKind: FullDebug, enums: !2)
     42 !1 = !DIFile(filename: "test.i", directory: "/")
     43 !2 = !{}
     44 !3 = !{i32 2, !"Dwarf Version", i32 2}
     45 !4 = !{i32 2, !"Debug Info Version", i32 3}
     46 !5 = !{i32 1, !"wchar_size", i32 4}
     47 !6 = !{i32 7, !"PIC Level", i32 2}
     48 !7 = !{!"clang version 6.0.0 (trunk 317700) (llvm/trunk 317708)"}
     49 !8 = distinct !DISubprogram(name: "f", scope: !1, file: !1, line: 2, type: !9, isLocal: false, isDefinition: true, scopeLine: 4, flags: DIFlagPrototyped, isOptimized: true, unit: !0, retainedNodes: !13)
     50 !9 = !DISubroutineType(types: !10)
     51 !10 = !{!11, !11}
     52 !11 = !DIBasicType(name: "int", size: 32, encoding: DW_ATE_signed)
     53 !12 = !DIBasicType(name: "long long unsigned int", size: 64, encoding: DW_ATE_unsigned)
     54 !13 = !{!14, !16}
     55 !14 = !DILocalVariable(name: "cntrl_flags", arg: 1, scope: !8, file: !1, line: 2, type: !12)
     56 !16 = !DILocalVariable(name: "tag", scope: !8, file: !1, line: 5, type: !17)
     57 !17 = !DIBasicType(name: "unsigned char", size: 8, encoding: DW_ATE_unsigned_char)
     58 !18 = !DILocation(line: 2, column: 22, scope: !8)
     59 !19 = !DILocation(line: 3, column: 31, scope: !8)
     60 !20 = !DILocation(line: 6, column: 24, scope: !8)
     61 !21 = !DILocation(line: 6, column: 8, scope: !8)
     62 !22 = !DILocation(line: 5, column: 16, scope: !8)
     63 !23 = !DILocation(line: 7, column: 2, scope: !8)
     64 !24 = !DILocation(line: 8, column: 1, scope: !8)
     65