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clang-p2996/llvm/test/DebugInfo/NVPTX/debug-addr-class.ll
William G Hatch ae635d6f99 [NVPTX] add support for .debug_loc section (#110905) 
Enable .debug_loc section for NVPTX backend.

This commit makes NVPTX omit DW_AT_low_pc (and DW_AT_high_pc) for
DW_TAG_compile_unit. This is because cuda-gdb uses the compile unit's
low_pc as a base address, and adds the addresses in the debug_loc
section to it. Removing low_pc is equivalent to setting that base
address to zero, so addition doesn't break the location ranges.
Additionally, this patch forces debug_loc label emission to emit single
labels with no subtraction or base. This would not be necessary if we
could emit `label1 - label2` expressions in PTX. The PTX documentation
at
https://docs.nvidia.com/cuda/parallel-thread-execution/index.html#debugging-directives-section
makes it seem like this is supported, but it doesn't actually work. I
believe when that documentation says that you can subtract “label
addresses between labels in the same dwarf section”, it doesn't merely
mean that the labels need to be in the same section as each other, but
in fact they need to be in the same section as the use. If support for
label subtraction is supported such that in the debug_loc section you
can subtract labels from the main code section, then we can remove the
workarounds added in this PR.

Also, since this now emits valid .debug_loc sections, it replaces the
empty .debug_loc to force existence of at least one debug section with
an empty .debug_macinfo section, which matches what nvcc does.
2024-10-03 16:31:49 -06:00

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; RUN: llc -mtriple=nvptx64-nvidia-cuda < %s | FileCheck %s
; RUN: %if ptxas %{ llc -mtriple=nvptx64-nvidia-cuda < %s | %ptxas-verify %}
@GLOBAL = addrspace(1) externally_initialized global i32 0, align 4, !dbg !0
@SHARED = addrspace(3) externally_initialized global i32 undef, align 4, !dbg !6
define void @test(float, ptr, ptr, i32) !dbg !17 {
%5 = alloca float, align 4
%6 = alloca ptr, align 8
%7 = alloca ptr, align 8
%8 = alloca i32, align 4
store float %0, ptr %5, align 4
call void @llvm.dbg.declare(metadata ptr %5, metadata !22, metadata !DIExpression()), !dbg !23
store ptr %1, ptr %6, align 8
call void @llvm.dbg.declare(metadata ptr %6, metadata !24, metadata !DIExpression()), !dbg !25
store ptr %2, ptr %7, align 8
call void @llvm.dbg.declare(metadata ptr %7, metadata !26, metadata !DIExpression()), !dbg !27
store i32 %3, ptr %8, align 4
call void @llvm.dbg.declare(metadata ptr %8, metadata !28, metadata !DIExpression()), !dbg !29
%9 = load float, ptr %5, align 4, !dbg !30
%10 = load ptr, ptr %6, align 8, !dbg !31
%11 = load i32, ptr %8, align 4, !dbg !32
%12 = sext i32 %11 to i64, !dbg !31
%13 = getelementptr inbounds float, ptr %10, i64 %12, !dbg !31
%14 = load float, ptr %13, align 4, !dbg !31
%15 = fmul contract float %9, %14, !dbg !33
%16 = load ptr, ptr %7, align 8, !dbg !34
%17 = load i32, ptr %8, align 4, !dbg !35
%18 = sext i32 %17 to i64, !dbg !34
%19 = getelementptr inbounds float, ptr %16, i64 %18, !dbg !34
store float %15, ptr %19, align 4, !dbg !36
store i32 0, ptr addrspacecast (ptr addrspace(1) @GLOBAL to ptr), align 4, !dbg !37
store i32 0, ptr addrspacecast (ptr addrspace(3) @SHARED to ptr), align 4, !dbg !38
ret void, !dbg !39
}
; Function Attrs: nounwind readnone speculatable
declare void @llvm.dbg.declare(metadata, metadata, metadata)
!llvm.dbg.cu = !{!2}
!nvvm.annotations = !{!10}
!llvm.module.flags = !{!11, !12, !13, !14, !15}
!llvm.ident = !{!16}
!0 = !DIGlobalVariableExpression(var: !1, expr: !DIExpression())
!1 = distinct !DIGlobalVariable(name: "GLOBAL", scope: !2, file: !8, line: 3, type: !9, isLocal: false, isDefinition: true)
!2 = distinct !DICompileUnit(language: DW_LANG_C_plus_plus, file: !3, producer: "clang version 9.0.0 (trunk 351969) (llvm/trunk 351973)", isOptimized: false, runtimeVersion: 0, emissionKind: FullDebug, enums: !4, globals: !5, nameTableKind: None)
!3 = !DIFile(filename: "new.cc", directory: "/tmp")
!4 = !{}
!5 = !{!0, !6}
!6 = !DIGlobalVariableExpression(var: !7, expr: !DIExpression(DW_OP_constu, 8, DW_OP_swap, DW_OP_xderef))
!7 = distinct !DIGlobalVariable(name: "SHARED", scope: !2, file: !8, line: 4, type: !9, isLocal: false, isDefinition: true)
!8 = !DIFile(filename: "test.cu", directory: "/tmp")
!9 = !DIBasicType(name: "int", size: 32, encoding: DW_ATE_signed)
!10 = !{ptr @test, !"kernel", i32 1}
!11 = !{i32 2, !"Dwarf Version", i32 2}
!12 = !{i32 2, !"Debug Info Version", i32 3}
!13 = !{i32 1, !"wchar_size", i32 4}
!14 = !{i32 4, !"nvvm-reflect-ftz", i32 0}
!15 = !{i32 7, !"PIC Level", i32 2}
!16 = !{!"clang version 9.0.0 (trunk 351969) (llvm/trunk 351973)"}
!17 = distinct !DISubprogram(name: "test", linkageName: "test", scope: !8, file: !8, line: 6, type: !18, scopeLine: 6, flags: DIFlagPrototyped, spFlags: DISPFlagDefinition, unit: !2, retainedNodes: !40)
!18 = !DISubroutineType(types: !19)
!19 = !{null, !20, !21, !21, !9}
!20 = !DIBasicType(name: "float", size: 32, encoding: DW_ATE_float)
!21 = !DIDerivedType(tag: DW_TAG_pointer_type, baseType: !20, size: 64)
!22 = !DILocalVariable(name: "a", arg: 1, scope: !17, file: !8, line: 6, type: !20)
!23 = !DILocation(line: 6, column: 41, scope: !17)
!24 = !DILocalVariable(name: "x", arg: 2, scope: !17, file: !8, line: 6, type: !21)
!25 = !DILocation(line: 6, column: 51, scope: !17)
!26 = !DILocalVariable(name: "y", arg: 3, scope: !17, file: !8, line: 6, type: !21)
!27 = !DILocation(line: 6, column: 61, scope: !17)
!28 = !DILocalVariable(name: "i", arg: 4, scope: !17, file: !8, line: 6, type: !9)
!29 = !DILocation(line: 6, column: 68, scope: !17)
!30 = !DILocation(line: 7, column: 10, scope: !17)
!31 = !DILocation(line: 7, column: 14, scope: !17)
!32 = !DILocation(line: 7, column: 16, scope: !17)
!33 = !DILocation(line: 7, column: 12, scope: !17)
!34 = !DILocation(line: 7, column: 3, scope: !17)
!35 = !DILocation(line: 7, column: 5, scope: !17)
!36 = !DILocation(line: 7, column: 8, scope: !17)
!37 = !DILocation(line: 8, column: 10, scope: !17)
!38 = !DILocation(line: 9, column: 10, scope: !17)
!39 = !DILocation(line: 10, column: 1, scope: !17)
!40 = !{!22, !24, !26, !28}
; CHECK: .section .debug_abbrev
; CHECK-NEXT: {
; CHECK-NEXT: .b8 1 // Abbreviation Code
; CHECK-NEXT: .b8 17 // DW_TAG_compile_unit
; CHECK-NEXT: .b8 1 // DW_CHILDREN_yes
; CHECK-NEXT: .b8 37 // DW_AT_producer
; CHECK-NEXT: .b8 8 // DW_FORM_string
; CHECK-NEXT: .b8 19 // DW_AT_language
; CHECK-NEXT: .b8 5 // DW_FORM_data2
; CHECK-NEXT: .b8 3 // DW_AT_name
; CHECK-NEXT: .b8 8 // DW_FORM_string
; CHECK-NEXT: .b8 16 // DW_AT_stmt_list
; CHECK-NEXT: .b8 6 // DW_FORM_data4
; CHECK-NEXT: .b8 27 // DW_AT_comp_dir
; CHECK-NEXT: .b8 8 // DW_FORM_string
; CHECK-NEXT: .b8 0 // EOM(1)
; CHECK-NEXT: .b8 0 // EOM(2)
; CHECK-NEXT: .b8 2 // Abbreviation Code
; CHECK-NEXT: .b8 52 // DW_TAG_variable
; CHECK-NEXT: .b8 0 // DW_CHILDREN_no
; CHECK-NEXT: .b8 3 // DW_AT_name
; CHECK-NEXT: .b8 8 // DW_FORM_string
; CHECK-NEXT: .b8 73 // DW_AT_type
; CHECK-NEXT: .b8 19 // DW_FORM_ref4
; CHECK-NEXT: .b8 63 // DW_AT_external
; CHECK-NEXT: .b8 12 // DW_FORM_flag
; CHECK-NEXT: .b8 58 // DW_AT_decl_file
; CHECK-NEXT: .b8 11 // DW_FORM_data1
; CHECK-NEXT: .b8 59 // DW_AT_decl_line
; CHECK-NEXT: .b8 11 // DW_FORM_data1
; CHECK-NEXT: .b8 51 // DW_AT_address_class
; CHECK-NEXT: .b8 11 // DW_FORM_data1
; CHECK-NEXT: .b8 2 // DW_AT_location
; CHECK-NEXT: .b8 10 // DW_FORM_block1
; CHECK-NEXT: .b8 0 // EOM(1)
; CHECK-NEXT: .b8 0 // EOM(2)
; CHECK-NEXT: .b8 3 // Abbreviation Code
; CHECK-NEXT: .b8 36 // DW_TAG_base_type
; CHECK-NEXT: .b8 0 // DW_CHILDREN_no
; CHECK-NEXT: .b8 3 // DW_AT_name
; CHECK-NEXT: .b8 8 // DW_FORM_string
; CHECK-NEXT: .b8 62 // DW_AT_encoding
; CHECK-NEXT: .b8 11 // DW_FORM_data1
; CHECK-NEXT: .b8 11 // DW_AT_byte_size
; CHECK-NEXT: .b8 11 // DW_FORM_data1
; CHECK-NEXT: .b8 0 // EOM(1)
; CHECK-NEXT: .b8 0 // EOM(2)
; CHECK-NEXT: .b8 4 // Abbreviation Code
; CHECK-NEXT: .b8 46 // DW_TAG_subprogram
; CHECK-NEXT: .b8 1 // DW_CHILDREN_yes
; CHECK-NEXT: .b8 17 // DW_AT_low_pc
; CHECK-NEXT: .b8 1 // DW_FORM_addr
; CHECK-NEXT: .b8 18 // DW_AT_high_pc
; CHECK-NEXT: .b8 1 // DW_FORM_addr
; CHECK-NEXT: .b8 64 // DW_AT_frame_base
; CHECK-NEXT: .b8 10 // DW_FORM_block1
; CHECK-NEXT: .b8 135 // DW_AT_MIPS_linkage_name
; CHECK-NEXT: .b8 64
; CHECK-NEXT: .b8 8 // DW_FORM_string
; CHECK-NEXT: .b8 3 // DW_AT_name
; CHECK-NEXT: .b8 8 // DW_FORM_string
; CHECK-NEXT: .b8 58 // DW_AT_decl_file
; CHECK-NEXT: .b8 11 // DW_FORM_data1
; CHECK-NEXT: .b8 59 // DW_AT_decl_line
; CHECK-NEXT: .b8 11 // DW_FORM_data1
; CHECK-NEXT: .b8 63 // DW_AT_external
; CHECK-NEXT: .b8 12 // DW_FORM_flag
; CHECK-NEXT: .b8 0 // EOM(1)
; CHECK-NEXT: .b8 0 // EOM(2)
; CHECK-NEXT: .b8 5 // Abbreviation Code
; CHECK-NEXT: .b8 5 // DW_TAG_formal_parameter
; CHECK-NEXT: .b8 0 // DW_CHILDREN_no
; CHECK-NEXT: .b8 51 // DW_AT_address_class
; CHECK-NEXT: .b8 11 // DW_FORM_data1
; CHECK-NEXT: .b8 2 // DW_AT_location
; CHECK-NEXT: .b8 10 // DW_FORM_block1
; CHECK-NEXT: .b8 3 // DW_AT_name
; CHECK-NEXT: .b8 8 // DW_FORM_string
; CHECK-NEXT: .b8 58 // DW_AT_decl_file
; CHECK-NEXT: .b8 11 // DW_FORM_data1
; CHECK-NEXT: .b8 59 // DW_AT_decl_line
; CHECK-NEXT: .b8 11 // DW_FORM_data1
; CHECK-NEXT: .b8 73 // DW_AT_type
; CHECK-NEXT: .b8 19 // DW_FORM_ref4
; CHECK-NEXT: .b8 0 // EOM(1)
; CHECK-NEXT: .b8 0 // EOM(2)
; CHECK-NEXT: .b8 6 // Abbreviation Code
; CHECK-NEXT: .b8 5 // DW_TAG_formal_parameter
; CHECK-NEXT: .b8 0 // DW_CHILDREN_no
; CHECK-NEXT: .b8 3 // DW_AT_name
; CHECK-NEXT: .b8 8 // DW_FORM_string
; CHECK-NEXT: .b8 58 // DW_AT_decl_file
; CHECK-NEXT: .b8 11 // DW_FORM_data1
; CHECK-NEXT: .b8 59 // DW_AT_decl_line
; CHECK-NEXT: .b8 11 // DW_FORM_data1
; CHECK-NEXT: .b8 73 // DW_AT_type
; CHECK-NEXT: .b8 19 // DW_FORM_ref4
; CHECK-NEXT: .b8 0 // EOM(1)
; CHECK-NEXT: .b8 0 // EOM(2)
; CHECK-NEXT: .b8 7 // Abbreviation Code
; CHECK-NEXT: .b8 15 // DW_TAG_pointer_type
; CHECK-NEXT: .b8 0 // DW_CHILDREN_no
; CHECK-NEXT: .b8 73 // DW_AT_type
; CHECK-NEXT: .b8 19 // DW_FORM_ref4
; CHECK-NEXT: .b8 0 // EOM(1)
; CHECK-NEXT: .b8 0 // EOM(2)
; CHECK-NEXT: .b8 0 // EOM(3)
; CHECK-NEXT: }
; CHECK-NEXT: .section .debug_info
; CHECK-NEXT: {
; CHECK-NEXT: .b32 238 // Length of Unit
; CHECK-NEXT: .b8 2 // DWARF version number
; CHECK-NEXT: .b8 0
; CHECK-NEXT: .b32 .debug_abbrev // Offset Into Abbrev. Section
; CHECK-NEXT: .b8 8 // Address Size (in bytes)
; CHECK-NEXT: .b8 1 // Abbrev [1] 0xb:0xe7 DW_TAG_compile_unit
; CHECK-NEXT: .b8 99 // DW_AT_producer
; CHECK-NEXT: .b8 108
; CHECK-NEXT: .b8 97
; CHECK-NEXT: .b8 110
; CHECK-NEXT: .b8 103
; CHECK-NEXT: .b8 32
; CHECK-NEXT: .b8 118
; CHECK-NEXT: .b8 101
; CHECK-NEXT: .b8 114
; CHECK-NEXT: .b8 115
; CHECK-NEXT: .b8 105
; CHECK-NEXT: .b8 111
; CHECK-NEXT: .b8 110
; CHECK-NEXT: .b8 32
; CHECK-NEXT: .b8 57
; CHECK-NEXT: .b8 46
; CHECK-NEXT: .b8 48
; CHECK-NEXT: .b8 46
; CHECK-NEXT: .b8 48
; CHECK-NEXT: .b8 32
; CHECK-NEXT: .b8 40
; CHECK-NEXT: .b8 116
; CHECK-NEXT: .b8 114
; CHECK-NEXT: .b8 117
; CHECK-NEXT: .b8 110
; CHECK-NEXT: .b8 107
; CHECK-NEXT: .b8 32
; CHECK-NEXT: .b8 51
; CHECK-NEXT: .b8 53
; CHECK-NEXT: .b8 49
; CHECK-NEXT: .b8 57
; CHECK-NEXT: .b8 54
; CHECK-NEXT: .b8 57
; CHECK-NEXT: .b8 41
; CHECK-NEXT: .b8 32
; CHECK-NEXT: .b8 40
; CHECK-NEXT: .b8 108
; CHECK-NEXT: .b8 108
; CHECK-NEXT: .b8 118
; CHECK-NEXT: .b8 109
; CHECK-NEXT: .b8 47
; CHECK-NEXT: .b8 116
; CHECK-NEXT: .b8 114
; CHECK-NEXT: .b8 117
; CHECK-NEXT: .b8 110
; CHECK-NEXT: .b8 107
; CHECK-NEXT: .b8 32
; CHECK-NEXT: .b8 51
; CHECK-NEXT: .b8 53
; CHECK-NEXT: .b8 49
; CHECK-NEXT: .b8 57
; CHECK-NEXT: .b8 55
; CHECK-NEXT: .b8 51
; CHECK-NEXT: .b8 41
; CHECK-NEXT: .b8 0
; CHECK-NEXT: .b8 4 // DW_AT_language
; CHECK-NEXT: .b8 0
; CHECK-NEXT: .b8 110 // DW_AT_name
; CHECK-NEXT: .b8 101
; CHECK-NEXT: .b8 119
; CHECK-NEXT: .b8 46
; CHECK-NEXT: .b8 99
; CHECK-NEXT: .b8 99
; CHECK-NEXT: .b8 0
; CHECK-NEXT: .b32 .debug_line // DW_AT_stmt_list
; CHECK-NEXT: .b8 47 // DW_AT_comp_dir
; CHECK-NEXT: .b8 116
; CHECK-NEXT: .b8 109
; CHECK-NEXT: .b8 112
; CHECK-NEXT: .b8 0
; CHECK-NEXT: .b8 2 // Abbrev [2] 0x55:0x1a DW_TAG_variable
; CHECK-NEXT: .b8 71 // DW_AT_name
; CHECK-NEXT: .b8 76
; CHECK-NEXT: .b8 79
; CHECK-NEXT: .b8 66
; CHECK-NEXT: .b8 65
; CHECK-NEXT: .b8 76
; CHECK-NEXT: .b8 0
; CHECK-NEXT: .b32 111 // DW_AT_type
; CHECK-NEXT: .b8 1 // DW_AT_external
; CHECK-NEXT: .b8 1 // DW_AT_decl_file
; CHECK-NEXT: .b8 3 // DW_AT_decl_line
; CHECK-NEXT: .b8 5 // DW_AT_address_class
; CHECK-NEXT: .b8 9 // DW_AT_location
; CHECK-NEXT: .b8 3
; CHECK-NEXT: .b64 GLOBAL
; CHECK-NEXT: .b8 3 // Abbrev [3] 0x6f:0x7 DW_TAG_base_type
; CHECK-NEXT: .b8 105 // DW_AT_name
; CHECK-NEXT: .b8 110
; CHECK-NEXT: .b8 116
; CHECK-NEXT: .b8 0
; CHECK-NEXT: .b8 5 // DW_AT_encoding
; CHECK-NEXT: .b8 4 // DW_AT_byte_size
; CHECK-NEXT: .b8 2 // Abbrev [2] 0x76:0x1a DW_TAG_variable
; CHECK-NEXT: .b8 83 // DW_AT_name
; CHECK-NEXT: .b8 72
; CHECK-NEXT: .b8 65
; CHECK-NEXT: .b8 82
; CHECK-NEXT: .b8 69
; CHECK-NEXT: .b8 68
; CHECK-NEXT: .b8 0
; CHECK-NEXT: .b32 111 // DW_AT_type
; CHECK-NEXT: .b8 1 // DW_AT_external
; CHECK-NEXT: .b8 1 // DW_AT_decl_file
; CHECK-NEXT: .b8 4 // DW_AT_decl_line
; CHECK-NEXT: .b8 8 // DW_AT_address_class
; CHECK-NEXT: .b8 9 // DW_AT_location
; CHECK-NEXT: .b8 3
; CHECK-NEXT: .b64 SHARED
; CHECK-NEXT: .b8 4 // Abbrev [4] 0x90:0x53 DW_TAG_subprogram
; CHECK-NEXT: .b64 $L__func_begin0 // DW_AT_low_pc
; CHECK-NEXT: .b64 $L__func_end0 // DW_AT_high_pc
; CHECK-NEXT: .b8 1 // DW_AT_frame_base
; CHECK-NEXT: .b8 156
; CHECK-NEXT: .b8 116 // DW_AT_MIPS_linkage_name
; CHECK-NEXT: .b8 101
; CHECK-NEXT: .b8 115
; CHECK-NEXT: .b8 116
; CHECK-NEXT: .b8 0
; CHECK-NEXT: .b8 116 // DW_AT_name
; CHECK-NEXT: .b8 101
; CHECK-NEXT: .b8 115
; CHECK-NEXT: .b8 116
; CHECK-NEXT: .b8 0
; CHECK-NEXT: .b8 1 // DW_AT_decl_file
; CHECK-NEXT: .b8 6 // DW_AT_decl_line
; CHECK-NEXT: .b8 1 // DW_AT_external
; CHECK-NEXT: .b8 5 // Abbrev [5] 0xb0:0x10 DW_TAG_formal_parameter
; CHECK-NEXT: .b8 2 // DW_AT_address_class
; CHECK-NEXT: .b8 5 // DW_AT_location
; CHECK-NEXT: .b8 144
; CHECK-NEXT: .b8 177
; CHECK-NEXT: .b8 204
; CHECK-NEXT: .b8 149
; CHECK-NEXT: .b8 1
; CHECK-NEXT: .b8 97 // DW_AT_name
; CHECK-NEXT: .b8 0
; CHECK-NEXT: .b8 1 // DW_AT_decl_file
; CHECK-NEXT: .b8 6 // DW_AT_decl_line
; CHECK-NEXT: .b32 227 // DW_AT_type
; CHECK-NEXT: .b8 6 // Abbrev [6] 0xc0:0x9 DW_TAG_formal_parameter
; CHECK-NEXT: .b8 120 // DW_AT_name
; CHECK-NEXT: .b8 0
; CHECK-NEXT: .b8 1 // DW_AT_decl_file
; CHECK-NEXT: .b8 6 // DW_AT_decl_line
; CHECK-NEXT: .b32 236 // DW_AT_type
; CHECK-NEXT: .b8 6 // Abbrev [6] 0xc9:0x9 DW_TAG_formal_parameter
; CHECK-NEXT: .b8 121 // DW_AT_name
; CHECK-NEXT: .b8 0
; CHECK-NEXT: .b8 1 // DW_AT_decl_file
; CHECK-NEXT: .b8 6 // DW_AT_decl_line
; CHECK-NEXT: .b32 236 // DW_AT_type
; CHECK-NEXT: .b8 5 // Abbrev [5] 0xd2:0x10 DW_TAG_formal_parameter
; CHECK-NEXT: .b8 2 // DW_AT_address_class
; CHECK-NEXT: .b8 5 // DW_AT_location
; CHECK-NEXT: .b8 144
; CHECK-NEXT: .b8 177
; CHECK-NEXT: .b8 228
; CHECK-NEXT: .b8 149
; CHECK-NEXT: .b8 1
; CHECK-NEXT: .b8 105 // DW_AT_name
; CHECK-NEXT: .b8 0
; CHECK-NEXT: .b8 1 // DW_AT_decl_file
; CHECK-NEXT: .b8 6 // DW_AT_decl_line
; CHECK-NEXT: .b32 111 // DW_AT_type
; CHECK-NEXT: .b8 0 // End Of Children Mark
; CHECK-NEXT: .b8 3 // Abbrev [3] 0xe3:0x9 DW_TAG_base_type
; CHECK-NEXT: .b8 102 // DW_AT_name
; CHECK-NEXT: .b8 108
; CHECK-NEXT: .b8 111
; CHECK-NEXT: .b8 97
; CHECK-NEXT: .b8 116
; CHECK-NEXT: .b8 0
; CHECK-NEXT: .b8 4 // DW_AT_encoding
; CHECK-NEXT: .b8 4 // DW_AT_byte_size
; CHECK-NEXT: .b8 7 // Abbrev [7] 0xec:0x5 DW_TAG_pointer_type
; CHECK-NEXT: .b32 227 // DW_AT_type
; CHECK-NEXT: .b8 0 // End Of Children Mark
; CHECK-NEXT: }
; CHECK-NEXT: .section .debug_macinfo { }
; CHECK-NOT: debug_
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