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
5 ; typedef struct s1 { int a1; short a2; } __s1;
6 ; union u1 { int b1; __s1 b2; };
7 ; enum { FIELD_LSHIFT_U64 = 4, };
8 ; int test(union u1 *arg) {
9 ; unsigned r1 = __builtin_preserve_field_info(arg->b2.a1, FIELD_LSHIFT_U64);
10 ; unsigned r2 = __builtin_preserve_field_info(arg->b2.a2, FIELD_LSHIFT_U64);
11 ; /* big endian: r1: 32, r2: 48 */
12 ; /* little endian: r1: 32, r2: 48 */
16 ; clang -target bpf -O2 -g -S -emit-llvm -Xclang -disable-llvm-passes test.c
20 %union.u1 = type { %struct.s1 }
21 %struct.s1 = type { i32, i16 }
23 ; Function Attrs: nounwind readnone
24 define dso_local i32 @test(ptr %arg) local_unnamed_addr #0 !dbg !11 {
26 call void @llvm.dbg.value(metadata ptr %arg, metadata !27, metadata !DIExpression()), !dbg !30
27 %0 = tail call ptr @llvm.preserve.union.access.index.p0.u1s.p0.u1s(ptr %arg, i32 1), !dbg !31, !llvm.preserve.access.index !16
28 %1 = tail call ptr @llvm.preserve.struct.access.index.p0.p0.s1s(ptr elementtype(%struct.s1) %0, i32 0, i32 0), !dbg !32, !llvm.preserve.access.index !21
29 %2 = tail call i32 @llvm.bpf.preserve.field.info.p0(ptr %1, i64 4), !dbg !33
30 call void @llvm.dbg.value(metadata i32 %2, metadata !28, metadata !DIExpression()), !dbg !30
31 %3 = tail call ptr @llvm.preserve.struct.access.index.p0.p0.s1s(ptr elementtype(%struct.s1) %0, i32 1, i32 1), !dbg !34, !llvm.preserve.access.index !21
32 %4 = tail call i32 @llvm.bpf.preserve.field.info.p0(ptr %3, i64 4), !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
40 ; CHECK-ALU64: r0 += r1
41 ; CHECK-ALU32: w0 += w1
44 ; CHECK: .long 1 # BTF_KIND_UNION(id = 2)
45 ; CHECK: .ascii "u1" # string offset=1
46 ; CHECK: .ascii ".text" # string offset=43
47 ; CHECK: .ascii "0:1:0" # string offset=49
48 ; CHECK: .ascii "0:1:1" # string offset=92
50 ; CHECK: .long 16 # FieldReloc
51 ; CHECK-NEXT: .long 43 # Field reloc section string offset=43
53 ; CHECK-NEXT: .long .Ltmp{{[0-9]+}}
55 ; CHECK-NEXT: .long 49
57 ; CHECK-NEXT: .long .Ltmp{{[0-9]+}}
59 ; CHECK-NEXT: .long 92
62 ; Function Attrs: nounwind readnone
63 declare ptr @llvm.preserve.union.access.index.p0.u1s.p0.u1s(ptr, i32) #1
65 ; Function Attrs: nounwind readnone
66 declare ptr @llvm.preserve.struct.access.index.p0.p0.s1s(ptr, i32, i32) #1
68 ; Function Attrs: nounwind readnone
69 declare i32 @llvm.bpf.preserve.field.info.p0(ptr, i64) #1
71 ; Function Attrs: nounwind readnone
73 ; Function Attrs: nounwind readnone
75 ; Function Attrs: nounwind readnone speculatable willreturn
76 declare void @llvm.dbg.value(metadata, metadata, metadata) #2
78 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" }
79 attributes #1 = { nounwind readnone }
80 attributes #2 = { nounwind readnone speculatable willreturn }
83 !llvm.module.flags = !{!7, !8, !9}
86 !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)
87 !1 = !DIFile(filename: "test.c", directory: "/tmp/home/yhs/work/tests/core")
89 !3 = !DICompositeType(tag: DW_TAG_enumeration_type, file: !1, line: 3, baseType: !4, size: 32, elements: !5)
90 !4 = !DIBasicType(name: "unsigned int", size: 32, encoding: DW_ATE_unsigned)
92 !6 = !DIEnumerator(name: "FIELD_LSHIFT_U64", value: 4, isUnsigned: true)
93 !7 = !{i32 2, !"Dwarf Version", i32 4}
94 !8 = !{i32 2, !"Debug Info Version", i32 3}
95 !9 = !{i32 1, !"wchar_size", i32 4}
96 !10 = !{!"clang version 10.0.0 (https://github.com/llvm/llvm-project.git 5635073377f153f7f2ff9b34c77af3c79885ff4a)"}
97 !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)
98 !12 = !DISubroutineType(types: !13)
100 !14 = !DIBasicType(name: "int", size: 32, encoding: DW_ATE_signed)
101 !15 = !DIDerivedType(tag: DW_TAG_pointer_type, baseType: !16, size: 64)
102 !16 = distinct !DICompositeType(tag: DW_TAG_union_type, name: "u1", file: !1, line: 2, size: 64, elements: !17)
104 !18 = !DIDerivedType(tag: DW_TAG_member, name: "b1", scope: !16, file: !1, line: 2, baseType: !14, size: 32)
105 !19 = !DIDerivedType(tag: DW_TAG_member, name: "b2", scope: !16, file: !1, line: 2, baseType: !20, size: 64)
106 !20 = !DIDerivedType(tag: DW_TAG_typedef, name: "__s1", file: !1, line: 1, baseType: !21)
107 !21 = distinct !DICompositeType(tag: DW_TAG_structure_type, name: "s1", file: !1, line: 1, size: 64, elements: !22)
109 !23 = !DIDerivedType(tag: DW_TAG_member, name: "a1", scope: !21, file: !1, line: 1, baseType: !14, size: 32)
110 !24 = !DIDerivedType(tag: DW_TAG_member, name: "a2", scope: !21, file: !1, line: 1, baseType: !25, size: 16, offset: 32)
111 !25 = !DIBasicType(name: "short", size: 16, encoding: DW_ATE_signed)
112 !26 = !{!27, !28, !29}
113 !27 = !DILocalVariable(name: "arg", arg: 1, scope: !11, file: !1, line: 4, type: !15)
114 !28 = !DILocalVariable(name: "r1", scope: !11, file: !1, line: 5, type: !4)
115 !29 = !DILocalVariable(name: "r2", scope: !11, file: !1, line: 6, type: !4)
116 !30 = !DILocation(line: 0, scope: !11)
117 !31 = !DILocation(line: 5, column: 52, scope: !11)
118 !32 = !DILocation(line: 5, column: 55, scope: !11)
119 !33 = !DILocation(line: 5, column: 17, scope: !11)
120 !34 = !DILocation(line: 6, column: 55, scope: !11)
121 !35 = !DILocation(line: 6, column: 17, scope: !11)
122 !36 = !DILocation(line: 9, column: 13, scope: !11)
123 !37 = !DILocation(line: 9, column: 3, scope: !11)