1 ; RUN: opt -O2 %s | llvm-dis > %t1
2 ; RUN: llc -filetype=asm -o - %t1 | FileCheck %s
3 ; RUN: llc -mattr=+alu32 -filetype=asm -o - %t1 | FileCheck %s
6 ; union u { int a; int b; };
7 ; #define _(x) (__builtin_preserve_access_index(x))
8 ; int get_value(const ptr addr);
9 ; int test(union u *arg) { return get_value(_(&arg->b)); }
10 ; Compiler flag to generate IR:
11 ; clang -target bpf -S -O2 -g -emit-llvm -Xclang -disable-llvm-passes test.c
15 %union.u = type { i32 }
17 ; Function Attrs: nounwind
18 define dso_local i32 @test(ptr %arg) local_unnamed_addr #0 !dbg !7 {
20 call void @llvm.dbg.value(metadata ptr %arg, metadata !17, metadata !DIExpression()), !dbg !18
21 %0 = tail call ptr @llvm.preserve.union.access.index.p0.us.p0.us(ptr %arg, i32 1), !dbg !19, !llvm.preserve.access.index !12
22 %call = tail call i32 @get_value(ptr %0) #4, !dbg !20
23 ret i32 %call, !dbg !21
26 ; CHECK: [[RELOC:.Ltmp[0-9]+]]
29 ; CHECK: call get_value
32 ; CHECK: .section .BTF.ext,"",@progbits
33 ; CHECK: .long 16 # FieldReloc
34 ; CHECK-NEXT: .long 20 # Field reloc section string offset=20
36 ; CHECK-NEXT: .long [[RELOC]]
38 ; CHECK-NEXT: .long 26
41 declare dso_local i32 @get_value(ptr) local_unnamed_addr #1
43 ; Function Attrs: nounwind readnone
44 declare ptr @llvm.preserve.union.access.index.p0.us.p0.us(ptr, i32 immarg) #2
46 ; Function Attrs: nounwind readnone speculatable
47 declare void @llvm.dbg.value(metadata, metadata, metadata) #3
49 attributes #0 = { nounwind "correctly-rounded-divide-sqrt-fp-math"="false" "disable-tail-calls"="false" "less-precise-fpmad"="false" "min-legal-vector-width"="0" "frame-pointer"="all" "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" }
50 attributes #1 = { "correctly-rounded-divide-sqrt-fp-math"="false" "disable-tail-calls"="false" "less-precise-fpmad"="false" "frame-pointer"="all" "no-infs-fp-math"="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" }
51 attributes #2 = { nounwind readnone }
52 attributes #3 = { nounwind readnone speculatable }
53 attributes #4 = { nounwind }
56 !llvm.module.flags = !{!3, !4, !5}
59 !0 = distinct !DICompileUnit(language: DW_LANG_C99, file: !1, producer: "clang version 9.0.0 (trunk 365789)", isOptimized: true, runtimeVersion: 0, emissionKind: FullDebug, enums: !2, nameTableKind: None)
60 !1 = !DIFile(filename: "test.c", directory: "/tmp/home/yhs/work/tests/core")
62 !3 = !{i32 2, !"Dwarf Version", i32 4}
63 !4 = !{i32 2, !"Debug Info Version", i32 3}
64 !5 = !{i32 1, !"wchar_size", i32 4}
65 !6 = !{!"clang version 9.0.0 (trunk 365789)"}
66 !7 = distinct !DISubprogram(name: "test", scope: !1, file: !1, line: 4, type: !8, scopeLine: 4, flags: DIFlagPrototyped, spFlags: DISPFlagDefinition | DISPFlagOptimized, unit: !0, retainedNodes: !16)
67 !8 = !DISubroutineType(types: !9)
69 !10 = !DIBasicType(name: "int", size: 32, encoding: DW_ATE_signed)
70 !11 = !DIDerivedType(tag: DW_TAG_pointer_type, baseType: !12, size: 64)
71 !12 = distinct !DICompositeType(tag: DW_TAG_union_type, name: "u", file: !1, line: 1, size: 32, elements: !13)
73 !14 = !DIDerivedType(tag: DW_TAG_member, name: "a", scope: !12, file: !1, line: 1, baseType: !10, size: 32)
74 !15 = !DIDerivedType(tag: DW_TAG_member, name: "b", scope: !12, file: !1, line: 1, baseType: !10, size: 32)
76 !17 = !DILocalVariable(name: "arg", arg: 1, scope: !7, file: !1, line: 4, type: !11)
77 !18 = !DILocation(line: 0, scope: !7)
78 !19 = !DILocation(line: 4, column: 43, scope: !7)
79 !20 = !DILocation(line: 4, column: 33, scope: !7)
80 !21 = !DILocation(line: 4, column: 26, scope: !7)