1 ; RUN: llc -march=bpfel -filetype=asm -o - %s | FileCheck -check-prefixes=CHECK %s
2 ; RUN: llc -march=bpfeb -filetype=asm -o - %s | FileCheck -check-prefixes=CHECK %s
4 ; typedef struct s1 { int a1; short a2; } __s1;
5 ; union u1 { int b1; __s1 b2; };
6 ; enum { FIELD_LSHIFT_U64 = 4, };
7 ; int test(union u1 *arg) {
8 ; unsigned r1 = __builtin_preserve_field_info(arg->b2.a1, FIELD_LSHIFT_U64);
9 ; unsigned r2 = __builtin_preserve_field_info(arg->b2.a2, FIELD_LSHIFT_U64);
10 ; /* big endian: r1: 32, r2: 48 */
11 ; /* little endian: r1: 32, r2: 48 */
15 ; clang -target bpf -O2 -g -S -emit-llvm test.c
17 %union.u1 = type { %struct.s1 }
18 %struct.s1 = type { i32, i16 }
20 ; Function Attrs: nounwind readnone
21 define dso_local i32 @test(%union.u1* %arg) local_unnamed_addr #0 !dbg !11 {
23 call void @llvm.dbg.value(metadata %union.u1* %arg, metadata !27, metadata !DIExpression()), !dbg !30
24 %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
25 %b2 = getelementptr %union.u1, %union.u1* %0, i64 0, i32 0, !dbg !31
26 %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 !21
27 %2 = tail call i32 @llvm.bpf.preserve.field.info.p0i32(i32* %1, i64 4), !dbg !33
28 call void @llvm.dbg.value(metadata i32 %2, metadata !28, metadata !DIExpression()), !dbg !30
29 %3 = tail call i16* @llvm.preserve.struct.access.index.p0i16.p0s_struct.s1s(%struct.s1* %b2, i32 1, i32 1), !dbg !34, !llvm.preserve.access.index !21
30 %4 = tail call i32 @llvm.bpf.preserve.field.info.p0i16(i16* %3, i64 4), !dbg !35
31 call void @llvm.dbg.value(metadata i32 %4, metadata !29, metadata !DIExpression()), !dbg !30
32 %add = add i32 %4, %2, !dbg !36
33 ret i32 %add, !dbg !37
41 ; CHECK: .long 1 # BTF_KIND_UNION(id = 2)
42 ; CHECK: .ascii "u1" # string offset=1
43 ; CHECK: .ascii ".text" # string offset=43
44 ; CHECK: .ascii "0:1:0" # string offset=49
45 ; CHECK: .ascii "0:1:1" # string offset=92
47 ; CHECK: .long 16 # FieldReloc
48 ; CHECK-NEXT: .long 43 # Field reloc section string offset=43
50 ; CHECK-NEXT: .long .Ltmp{{[0-9]+}}
52 ; CHECK-NEXT: .long 49
54 ; CHECK-NEXT: .long .Ltmp{{[0-9]+}}
56 ; CHECK-NEXT: .long 92
59 ; Function Attrs: nounwind readnone
60 declare %union.u1* @llvm.preserve.union.access.index.p0s_union.u1s.p0s_union.u1s(%union.u1*, i32) #1
62 ; Function Attrs: nounwind readnone
63 declare i32* @llvm.preserve.struct.access.index.p0i32.p0s_struct.s1s(%struct.s1*, i32, i32) #1
65 ; Function Attrs: nounwind readnone
66 declare i32 @llvm.bpf.preserve.field.info.p0i32(i32*, i64) #1
68 ; Function Attrs: nounwind readnone
69 declare i16* @llvm.preserve.struct.access.index.p0i16.p0s_struct.s1s(%struct.s1*, i32, i32) #1
71 ; Function Attrs: nounwind readnone
72 declare i32 @llvm.bpf.preserve.field.info.p0i16(i16*, i64) #1
74 ; Function Attrs: nounwind readnone speculatable willreturn
75 declare void @llvm.dbg.value(metadata, metadata, metadata) #2
77 attributes #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" }
78 attributes #1 = { nounwind readnone }
79 attributes #2 = { nounwind readnone speculatable willreturn }
82 !llvm.module.flags = !{!7, !8, !9}
85 !0 = distinct !DICompileUnit(language: DW_LANG_C99, file: !1, producer: "clang version 10.0.0 (https://github.com/llvm/llvm-project.git 5635073377f153f7f2ff9b34c77af3c79885ff4a)", isOptimized: true, runtimeVersion: 0, emissionKind: FullDebug, enums: !2, nameTableKind: None)
86 !1 = !DIFile(filename: "test.c", directory: "/tmp/home/yhs/work/tests/core")
88 !3 = !DICompositeType(tag: DW_TAG_enumeration_type, file: !1, line: 3, baseType: !4, size: 32, elements: !5)
89 !4 = !DIBasicType(name: "unsigned int", size: 32, encoding: DW_ATE_unsigned)
91 !6 = !DIEnumerator(name: "FIELD_LSHIFT_U64", value: 4, isUnsigned: true)
92 !7 = !{i32 2, !"Dwarf Version", i32 4}
93 !8 = !{i32 2, !"Debug Info Version", i32 3}
94 !9 = !{i32 1, !"wchar_size", i32 4}
95 !10 = !{!"clang version 10.0.0 (https://github.com/llvm/llvm-project.git 5635073377f153f7f2ff9b34c77af3c79885ff4a)"}
96 !11 = distinct !DISubprogram(name: "test", scope: !1, file: !1, line: 4, type: !12, scopeLine: 4, flags: DIFlagPrototyped, isDefinition: true, isOptimized: true, unit: !0, retainedNodes: !26)
97 !12 = !DISubroutineType(types: !13)
99 !14 = !DIBasicType(name: "int", size: 32, encoding: DW_ATE_signed)
100 !15 = !DIDerivedType(tag: DW_TAG_pointer_type, baseType: !16, size: 64)
101 !16 = distinct !DICompositeType(tag: DW_TAG_union_type, name: "u1", file: !1, line: 2, size: 64, elements: !17)
103 !18 = !DIDerivedType(tag: DW_TAG_member, name: "b1", scope: !16, file: !1, line: 2, baseType: !14, size: 32)
104 !19 = !DIDerivedType(tag: DW_TAG_member, name: "b2", scope: !16, file: !1, line: 2, baseType: !20, size: 64)
105 !20 = !DIDerivedType(tag: DW_TAG_typedef, name: "__s1", file: !1, line: 1, baseType: !21)
106 !21 = distinct !DICompositeType(tag: DW_TAG_structure_type, name: "s1", file: !1, line: 1, size: 64, elements: !22)
108 !23 = !DIDerivedType(tag: DW_TAG_member, name: "a1", scope: !21, file: !1, line: 1, baseType: !14, size: 32)
109 !24 = !DIDerivedType(tag: DW_TAG_member, name: "a2", scope: !21, file: !1, line: 1, baseType: !25, size: 16, offset: 32)
110 !25 = !DIBasicType(name: "short", size: 16, encoding: DW_ATE_signed)
111 !26 = !{!27, !28, !29}
112 !27 = !DILocalVariable(name: "arg", arg: 1, scope: !11, file: !1, line: 4, type: !15)
113 !28 = !DILocalVariable(name: "r1", scope: !11, file: !1, line: 5, type: !4)
114 !29 = !DILocalVariable(name: "r2", scope: !11, file: !1, line: 6, type: !4)
115 !30 = !DILocation(line: 0, scope: !11)
116 !31 = !DILocation(line: 5, column: 52, scope: !11)
117 !32 = !DILocation(line: 5, column: 55, scope: !11)
118 !33 = !DILocation(line: 5, column: 17, scope: !11)
119 !34 = !DILocation(line: 6, column: 55, scope: !11)
120 !35 = !DILocation(line: 6, column: 17, scope: !11)
121 !36 = !DILocation(line: 9, column: 13, scope: !11)
122 !37 = !DILocation(line: 9, column: 3, scope: !11)