--- /dev/null
+; RUN: opt -O2 -mtriple=bpf-pc-linux %s | llvm-dis > %t1
+; RUN: llc -filetype=asm -o - %t1 | FileCheck %s
+; RUN: llc -mattr=+alu32 -filetype=asm -o - %t1 | FileCheck %s
+; Source code:
+; #define BPF_FIELD_EXISTS 2
+; unsigned test1() {
+; struct t {
+; int val;
+; } bar;
+; return __builtin_preserve_field_info((&bar)[1], BPF_FIELD_EXISTS);
+; }
+; Compilation flag:
+; clang -target bpf -O2 -g -S -emit-llvm -Xclang -disable-llvm-passes test.c
+
+%struct.t = type { i32 }
+
+; Function Attrs: nounwind
+define dso_local i32 @test1() #0 !dbg !6 {
+entry:
+ %bar = alloca %struct.t, align 4
+ %0 = bitcast %struct.t* %bar to i8*, !dbg !20
+ call void @llvm.lifetime.start.p0i8(i64 4, i8* %0) #5, !dbg !20
+ call void @llvm.dbg.declare(metadata %struct.t* %bar, metadata !11, metadata !DIExpression()), !dbg !21
+ %1 = call %struct.t* @llvm.preserve.array.access.index.p0s_struct.ts.p0s_struct.ts(%struct.t* %bar, i32 0, i32 1), !dbg !22, !llvm.preserve.access.index !4
+ %2 = call i32 @llvm.bpf.preserve.field.info.p0s_struct.ts(%struct.t* %1, i64 2), !dbg !23
+ %3 = bitcast %struct.t* %bar to i8*, !dbg !24
+ call void @llvm.lifetime.end.p0i8(i64 4, i8* %3) #5, !dbg !24
+ ret i32 %2, !dbg !25
+}
+
+; CHECK: r0 = 1
+; CHECK-NEXT: exit
+
+; CHECK: .long 26 # BTF_KIND_STRUCT(id = 4)
+; CHECK-NEXT: .long 67108865 # 0x4000001
+; CHECK-NEXT: .long 4
+; CHECK-NEXT: .long 28
+; CHECK-NEXT: .long 5
+; CHECK-NEXT: .long 0 # 0x0
+; CHECK-NEXT: .long 32 # BTF_KIND_INT(id = 5)
+; CHECK-NEXT: .long 16777216 # 0x1000000
+; CHECK-NEXT: .long 4
+; CHECK-NEXT: .long 16777248 # 0x1000020
+
+; CHECK: .byte 116 # string offset=26
+; CHECK: .ascii "val" # string offset=28
+; CHECK: .ascii "int" # string offset=32
+; CHECK: .byte 49 # string offset=36
+
+; CHECK: .long 16 # FieldReloc
+; CHECK-NEXT: .long {{[0-9]+}} # Field reloc section string
+; CHECK-NEXT: .long 1
+; CHECK-NEXT: .long .Ltmp{{[0-9]+}}
+; CHECK-NEXT: .long 4
+; CHECK-NEXT: .long 36
+; CHECK-NEXT: .long 2
+
+; Function Attrs: argmemonly nofree nosync nounwind willreturn
+declare void @llvm.lifetime.start.p0i8(i64 immarg, i8* nocapture) #1
+
+; Function Attrs: nofree nosync nounwind readnone speculatable willreturn
+declare void @llvm.dbg.declare(metadata, metadata, metadata) #2
+
+; Function Attrs: nofree nosync nounwind readnone willreturn
+declare %struct.t* @llvm.preserve.array.access.index.p0s_struct.ts.p0s_struct.ts(%struct.t*, i32 immarg, i32 immarg) #3
+
+; Function Attrs: nounwind readnone
+declare i32 @llvm.bpf.preserve.field.info.p0s_struct.ts(%struct.t*, i64 immarg) #4
+
+; Function Attrs: argmemonly nofree nosync nounwind willreturn
+declare void @llvm.lifetime.end.p0i8(i64 immarg, i8* nocapture) #1
+
+attributes #0 = { nounwind "frame-pointer"="all" "min-legal-vector-width"="0" "no-trapping-math"="true" "stack-protector-buffer-size"="8" }
+attributes #1 = { argmemonly nofree nosync nounwind willreturn }
+attributes #2 = { nofree nosync nounwind readnone speculatable willreturn }
+attributes #3 = { nofree nosync nounwind readnone willreturn }
+attributes #4 = { nounwind readnone }
+attributes #5 = { nounwind }
+
+!llvm.dbg.cu = !{!0}
+!llvm.module.flags = !{!15, !16, !17, !18}
+!llvm.ident = !{!19}
+
+!0 = distinct !DICompileUnit(language: DW_LANG_C99, file: !1, producer: "clang version 13.0.0 (https://github.com/llvm/llvm-project.git 2e0ee68dc85c0a2b7e65e489a60ab363393b06a8)", isOptimized: true, runtimeVersion: 0, emissionKind: FullDebug, enums: !2, retainedTypes: !3, splitDebugInlining: false, nameTableKind: None)
+!1 = !DIFile(filename: "test.c", directory: "/tmp/home/yhs/work/tests/core")
+!2 = !{}
+!3 = !{!4}
+!4 = !DIDerivedType(tag: DW_TAG_pointer_type, baseType: !5, size: 64)
+!5 = distinct !DICompositeType(tag: DW_TAG_structure_type, name: "t", scope: !6, file: !1, line: 3, size: 32, elements: !12)
+!6 = distinct !DISubprogram(name: "test1", scope: !1, file: !1, line: 2, type: !7, scopeLine: 2, flags: DIFlagAllCallsDescribed, spFlags: DISPFlagDefinition | DISPFlagOptimized, unit: !0, retainedNodes: !10)
+!7 = !DISubroutineType(types: !8)
+!8 = !{!9}
+!9 = !DIBasicType(name: "unsigned int", size: 32, encoding: DW_ATE_unsigned)
+!10 = !{!11}
+!11 = !DILocalVariable(name: "bar", scope: !6, file: !1, line: 5, type: !5)
+!12 = !{!13}
+!13 = !DIDerivedType(tag: DW_TAG_member, name: "val", scope: !5, file: !1, line: 4, baseType: !14, size: 32)
+!14 = !DIBasicType(name: "int", size: 32, encoding: DW_ATE_signed)
+!15 = !{i32 7, !"Dwarf Version", i32 4}
+!16 = !{i32 2, !"Debug Info Version", i32 3}
+!17 = !{i32 1, !"wchar_size", i32 4}
+!18 = !{i32 7, !"frame-pointer", i32 2}
+!19 = !{!"clang version 13.0.0 (https://github.com/llvm/llvm-project.git 2e0ee68dc85c0a2b7e65e489a60ab363393b06a8)"}
+!20 = !DILocation(line: 3, column: 3, scope: !6)
+!21 = !DILocation(line: 5, column: 5, scope: !6)
+!22 = !DILocation(line: 6, column: 40, scope: !6)
+!23 = !DILocation(line: 6, column: 10, scope: !6)
+!24 = !DILocation(line: 7, column: 1, scope: !6)
+!25 = !DILocation(line: 6, column: 3, scope: !6)