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1; RUN: opt -O2 %s | llvm-dis > %t1
2; RUN: llc -filetype=asm -o - %t1 | FileCheck -check-prefixes=CHECK,CHECK-ALU64 %s
3; RUN: llc -mattr=+alu32 -filetype=asm -o - %t1 | FileCheck -check-prefixes=CHECK,CHECK-ALU32 %s
4; Source code:
5;   typedef unsigned __uint;
6;   struct s1 { int a1; __uint a2:9; __uint a3:4; };
7;   union u1 { int b1; struct s1 b2; };
8;   enum { FIELD_EXISTENCE = 2, };
9;   int test(union u1 *arg) {
10;     unsigned r1 = __builtin_preserve_field_info(arg->b2.a1, FIELD_EXISTENCE);
11;     unsigned r2 = __builtin_preserve_field_info(arg->b2.a3, FIELD_EXISTENCE);
12;     return r1 + r2;
13;   }
14; Compilation flag:
15;   clang -target bpf -O2 -g -S -emit-llvm -Xclang -disable-llvm-passes test.c
16
17target triple = "bpf"
18
19%union.u1 = type { %struct.s1 }
20%struct.s1 = type { i32, i16 }
21
22; Function Attrs: nounwind readnone
23define dso_local i32 @test(%union.u1* %arg) local_unnamed_addr #0 !dbg !11 {
24entry:
25  call void @llvm.dbg.value(metadata %union.u1* %arg, metadata !27, metadata !DIExpression()), !dbg !30
26  %0 = tail call %union.u1* @llvm.preserve.union.access.index.p0s_union.u1s.p0s_union.u1s(%union.u1* %arg, i32 1), !dbg !31, !llvm.preserve.access.index !16
27  %b2 = getelementptr inbounds %union.u1, %union.u1* %0, i64 0, i32 0, !dbg !31
28  %1 = tail call i32* @llvm.preserve.struct.access.index.p0i32.p0s_struct.s1s(%struct.s1* %b2, i32 0, i32 0), !dbg !32, !llvm.preserve.access.index !20
29  %2 = tail call i32 @llvm.bpf.preserve.field.info.p0i32(i32* %1, i64 2), !dbg !33
30  call void @llvm.dbg.value(metadata i32 %2, metadata !28, metadata !DIExpression()), !dbg !30
31  %3 = tail call i16* @llvm.preserve.struct.access.index.p0i16.p0s_struct.s1s(%struct.s1* %b2, i32 1, i32 2), !dbg !34, !llvm.preserve.access.index !20
32  %4 = tail call i32 @llvm.bpf.preserve.field.info.p0i16(i16* %3, i64 2), !dbg !35
33  call void @llvm.dbg.value(metadata i32 %4, metadata !29, metadata !DIExpression()), !dbg !30
34  %add = add i32 %4, %2, !dbg !36
35  ret i32 %add, !dbg !37
36}
37
38; CHECK:             r1 = 1
39; CHECK:             r0 = 1
40; CHECK-ALU64:       r0 += r1
41; CHECK-ALU32:       w0 += w1
42; CHECK:             exit
43
44; CHECK:             .long   1                       # BTF_KIND_UNION(id = 2)
45; CHECK:             .ascii  "u1"                    # string offset=1
46; CHECK:             .ascii  ".text"                 # string offset=55
47; CHECK:             .ascii  "0:1:0"                 # string offset=61
48; CHECK:             .ascii  "0:1:2"                 # string offset=104
49
50; CHECK:             .long   16                      # FieldReloc
51; CHECK-NEXT:        .long   55                      # Field reloc section string offset=55
52; CHECK-NEXT:        .long   2
53; CHECK-NEXT:        .long   .Ltmp{{[0-9]+}}
54; CHECK-NEXT:        .long   2
55; CHECK-NEXT:        .long   61
56; CHECK-NEXT:        .long   2
57; CHECK-NEXT:        .long   .Ltmp{{[0-9]+}}
58; CHECK-NEXT:        .long   2
59; CHECK-NEXT:        .long   104
60; CHECK-NEXT:        .long   2
61
62; Function Attrs: nounwind readnone
63declare %union.u1* @llvm.preserve.union.access.index.p0s_union.u1s.p0s_union.u1s(%union.u1*, i32) #1
64
65; Function Attrs: nounwind readnone
66declare i32* @llvm.preserve.struct.access.index.p0i32.p0s_struct.s1s(%struct.s1*, i32, i32) #1
67
68; Function Attrs: nounwind readnone
69declare i32 @llvm.bpf.preserve.field.info.p0i32(i32*, i64) #1
70
71; Function Attrs: nounwind readnone
72declare i16* @llvm.preserve.struct.access.index.p0i16.p0s_struct.s1s(%struct.s1*, i32, i32) #1
73
74; Function Attrs: nounwind readnone
75declare i32 @llvm.bpf.preserve.field.info.p0i16(i16*, i64) #1
76
77; Function Attrs: nounwind readnone speculatable willreturn
78declare void @llvm.dbg.value(metadata, metadata, metadata) #2
79
80attributes #0 = { nounwind readnone "correctly-rounded-divide-sqrt-fp-math"="false" "disable-tail-calls"="false" "frame-pointer"="all" "less-precise-fpmad"="false" "min-legal-vector-width"="0" "no-infs-fp-math"="false" "no-jump-tables"="false" "no-nans-fp-math"="false" "no-signed-zeros-fp-math"="false" "no-trapping-math"="false" "stack-protector-buffer-size"="8" "unsafe-fp-math"="false" "use-soft-float"="false" }
81attributes #1 = { nounwind readnone }
82attributes #2 = { nounwind readnone speculatable willreturn }
83
84!llvm.dbg.cu = !{!0}
85!llvm.module.flags = !{!7, !8, !9}
86!llvm.ident = !{!10}
87
88!0 = distinct !DICompileUnit(language: DW_LANG_C99, file: !1, producer: "clang version 10.0.0 (https://github.com/llvm/llvm-project.git 4a60741b74384f14b21fdc0131ede326438840ab)", isOptimized: true, runtimeVersion: 0, emissionKind: FullDebug, enums: !2, nameTableKind: None)
89!1 = !DIFile(filename: "test.c", directory: "/tmp/home/yhs/work/tests/core")
90!2 = !{!3}
91!3 = !DICompositeType(tag: DW_TAG_enumeration_type, file: !1, line: 4, baseType: !4, size: 32, elements: !5)
92!4 = !DIBasicType(name: "unsigned int", size: 32, encoding: DW_ATE_unsigned)
93!5 = !{!6}
94!6 = !DIEnumerator(name: "FIELD_EXISTENCE", value: 2, isUnsigned: true)
95!7 = !{i32 2, !"Dwarf Version", i32 4}
96!8 = !{i32 2, !"Debug Info Version", i32 3}
97!9 = !{i32 1, !"wchar_size", i32 4}
98!10 = !{!"clang version 10.0.0 (https://github.com/llvm/llvm-project.git 4a60741b74384f14b21fdc0131ede326438840ab)"}
99!11 = distinct !DISubprogram(name: "test", scope: !1, file: !1, line: 5, type: !12, scopeLine: 5, flags: DIFlagPrototyped, isDefinition: true, isOptimized: true, unit: !0, retainedNodes: !26)
100!12 = !DISubroutineType(types: !13)
101!13 = !{!14, !15}
102!14 = !DIBasicType(name: "int", size: 32, encoding: DW_ATE_signed)
103!15 = !DIDerivedType(tag: DW_TAG_pointer_type, baseType: !16, size: 64)
104!16 = distinct !DICompositeType(tag: DW_TAG_union_type, name: "u1", file: !1, line: 3, size: 64, elements: !17)
105!17 = !{!18, !19}
106!18 = !DIDerivedType(tag: DW_TAG_member, name: "b1", scope: !16, file: !1, line: 3, baseType: !14, size: 32)
107!19 = !DIDerivedType(tag: DW_TAG_member, name: "b2", scope: !16, file: !1, line: 3, baseType: !20, size: 64)
108!20 = distinct !DICompositeType(tag: DW_TAG_structure_type, name: "s1", file: !1, line: 2, size: 64, elements: !21)
109!21 = !{!22, !23, !25}
110!22 = !DIDerivedType(tag: DW_TAG_member, name: "a1", scope: !20, file: !1, line: 2, baseType: !14, size: 32)
111!23 = !DIDerivedType(tag: DW_TAG_member, name: "a2", scope: !20, file: !1, line: 2, baseType: !24, size: 9, offset: 32, flags: DIFlagBitField, extraData: i64 32)
112!24 = !DIDerivedType(tag: DW_TAG_typedef, name: "__uint", file: !1, line: 1, baseType: !4)
113!25 = !DIDerivedType(tag: DW_TAG_member, name: "a3", scope: !20, file: !1, line: 2, baseType: !24, size: 4, offset: 41, flags: DIFlagBitField, extraData: i64 32)
114!26 = !{!27, !28, !29}
115!27 = !DILocalVariable(name: "arg", arg: 1, scope: !11, file: !1, line: 5, type: !15)
116!28 = !DILocalVariable(name: "r1", scope: !11, file: !1, line: 6, type: !4)
117!29 = !DILocalVariable(name: "r2", scope: !11, file: !1, line: 7, type: !4)
118!30 = !DILocation(line: 0, scope: !11)
119!31 = !DILocation(line: 6, column: 52, scope: !11)
120!32 = !DILocation(line: 6, column: 55, scope: !11)
121!33 = !DILocation(line: 6, column: 17, scope: !11)
122!34 = !DILocation(line: 7, column: 55, scope: !11)
123!35 = !DILocation(line: 7, column: 17, scope: !11)
124!36 = !DILocation(line: 8, column: 13, scope: !11)
125!37 = !DILocation(line: 8, column: 3, scope: !11)
126