1; RUN: opt -O2 %s | llvm-dis > %t1 2; RUN: llc -filetype=asm -o - %t1 | FileCheck -check-prefixes=CHECK %s 3; RUN: llc -mattr=+alu32 -filetype=asm -o - %t1 | FileCheck -check-prefixes=CHECK %s 4; Source code: 5; union v1 { int a; int b; }; 6; typedef union v1 __v1; 7; typedef int __int; 8; union v3 { char c; __int d[40]; }; 9; typedef union v3 __v3; 10; #define _(x) (__builtin_preserve_access_index(x)) 11; #define cast_to_v1(x) ((__v1 *)(x)) 12; int get_value(const int *arg); 13; int test(__v3 *arg) { 14; return get_value(_(&cast_to_v1(&arg->d[4])->b)); 15; } 16; Compilation flag: 17; clang -target bpf -O2 -g -S -emit-llvm -Xclang -disable-llvm-passes test.c 18 19target triple = "bpf" 20 21%union.v3 = type { [40 x i32] } 22%union.v1 = type { i32 } 23 24; Function Attrs: nounwind 25define dso_local i32 @test(ptr %arg) local_unnamed_addr #0 !dbg !19 { 26entry: 27 call void @llvm.dbg.value(metadata ptr %arg, metadata !30, metadata !DIExpression()), !dbg !31 28 %0 = tail call ptr @llvm.preserve.union.access.index.p0.p0(ptr %arg, i32 1), !dbg !32, !llvm.preserve.access.index !24 29 %d = getelementptr inbounds %union.v3, ptr %0, i64 0, i32 0, !dbg !32 30 %1 = tail call ptr @llvm.preserve.array.access.index.p0.p0(ptr elementtype([40 x i32]) %d, i32 1, i32 4), !dbg !32, !llvm.preserve.access.index !11 31 %2 = bitcast ptr %1 to ptr, !dbg !32 32 %3 = tail call ptr @llvm.preserve.union.access.index.p0.p0(ptr %2, i32 1), !dbg !32, !llvm.preserve.access.index !6 33 %b = getelementptr inbounds %union.v1, ptr %3, i64 0, i32 0, !dbg !32 34 %call = tail call i32 @get_value(ptr %b) #4, !dbg !33 35 ret i32 %call, !dbg !34 36} 37 38; CHECK: r2 = 16 39; CHECK: r1 += r2 40; CHECK: r2 = 0 41; CHECK: r1 += r2 42; CHECK: call get_value 43 44; CHECK: .long 6 # BTF_KIND_UNION(id = [[TID1:[0-9]+]]) 45; CHECK: .long 111 # BTF_KIND_UNION(id = [[TID2:[0-9]+]]) 46 47; CHECK: .ascii "v3" # string offset=6 48; CHECK: .ascii ".text" # string offset=57 49; CHECK: .ascii "0:1:4" # string offset=63 50; CHECK: .ascii "v1" # string offset=111 51; CHECK: .ascii "0:1" # string offset=118 52 53; CHECK: .long 16 # FieldReloc 54; CHECK-NEXT: .long 57 # Field reloc section string offset=57 55; CHECK-NEXT: .long 2 56; CHECK-NEXT: .long .Ltmp{{[0-9]+}} 57; CHECK-NEXT: .long [[TID1]] 58; CHECK-NEXT: .long 63 59; CHECK-NEXT: .long 0 60; CHECK-NEXT: .long .Ltmp{{[0-9]+}} 61; CHECK-NEXT: .long [[TID2]] 62; CHECK-NEXT: .long 118 63; CHECK-NEXT: .long 0 64 65declare dso_local i32 @get_value(ptr) local_unnamed_addr #1 66 67; Function Attrs: nounwind readnone 68declare ptr @llvm.preserve.union.access.index.p0.p0(ptr, i32) #2 69 70; Function Attrs: nounwind readnone 71declare ptr @llvm.preserve.array.access.index.p0.p0(ptr, i32, i32) #2 72 73; Function Attrs: nounwind readnone 74 75; Function Attrs: nounwind readnone speculatable willreturn 76declare void @llvm.dbg.value(metadata, metadata, metadata) #3 77 78attributes #0 = { nounwind "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" } 79attributes #1 = { "correctly-rounded-divide-sqrt-fp-math"="false" "disable-tail-calls"="false" "frame-pointer"="all" "less-precise-fpmad"="false" "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" } 80attributes #2 = { nounwind readnone } 81attributes #3 = { nounwind readnone speculatable willreturn } 82attributes #4 = { nounwind } 83 84!llvm.dbg.cu = !{!0} 85!llvm.module.flags = !{!15, !16, !17} 86!llvm.ident = !{!18} 87 88!0 = distinct !DICompileUnit(language: DW_LANG_C99, file: !1, producer: "clang version 10.0.0 (trunk 367256) (llvm/trunk 367266)", isOptimized: true, runtimeVersion: 0, emissionKind: FullDebug, enums: !2, retainedTypes: !3, nameTableKind: None) 89!1 = !DIFile(filename: "test.c", directory: "/tmp/home/yhs/work/tests/llvm/cast") 90!2 = !{} 91!3 = !{!4, !11} 92!4 = !DIDerivedType(tag: DW_TAG_pointer_type, baseType: !5, size: 64) 93!5 = !DIDerivedType(tag: DW_TAG_typedef, name: "__v1", file: !1, line: 2, baseType: !6) 94!6 = distinct !DICompositeType(tag: DW_TAG_union_type, name: "v1", file: !1, line: 1, size: 32, elements: !7) 95!7 = !{!8, !10} 96!8 = !DIDerivedType(tag: DW_TAG_member, name: "a", scope: !6, file: !1, line: 1, baseType: !9, size: 32) 97!9 = !DIBasicType(name: "int", size: 32, encoding: DW_ATE_signed) 98!10 = !DIDerivedType(tag: DW_TAG_member, name: "b", scope: !6, file: !1, line: 1, baseType: !9, size: 32) 99!11 = !DICompositeType(tag: DW_TAG_array_type, baseType: !12, size: 1280, elements: !13) 100!12 = !DIDerivedType(tag: DW_TAG_typedef, name: "__int", file: !1, line: 3, baseType: !9) 101!13 = !{!14} 102!14 = !DISubrange(count: 40) 103!15 = !{i32 2, !"Dwarf Version", i32 4} 104!16 = !{i32 2, !"Debug Info Version", i32 3} 105!17 = !{i32 1, !"wchar_size", i32 4} 106!18 = !{!"clang version 10.0.0 (trunk 367256) (llvm/trunk 367266)"} 107!19 = distinct !DISubprogram(name: "test", scope: !1, file: !1, line: 9, type: !20, scopeLine: 9, flags: DIFlagPrototyped, isDefinition: true, isOptimized: true, unit: !0, retainedNodes: !29) 108!20 = !DISubroutineType(types: !21) 109!21 = !{!9, !22} 110!22 = !DIDerivedType(tag: DW_TAG_pointer_type, baseType: !23, size: 64) 111!23 = !DIDerivedType(tag: DW_TAG_typedef, name: "__v3", file: !1, line: 5, baseType: !24) 112!24 = distinct !DICompositeType(tag: DW_TAG_union_type, name: "v3", file: !1, line: 4, size: 1280, elements: !25) 113!25 = !{!26, !28} 114!26 = !DIDerivedType(tag: DW_TAG_member, name: "c", scope: !24, file: !1, line: 4, baseType: !27, size: 8) 115!27 = !DIBasicType(name: "char", size: 8, encoding: DW_ATE_signed_char) 116!28 = !DIDerivedType(tag: DW_TAG_member, name: "d", scope: !24, file: !1, line: 4, baseType: !11, size: 1280) 117!29 = !{!30} 118!30 = !DILocalVariable(name: "arg", arg: 1, scope: !19, file: !1, line: 9, type: !22) 119!31 = !DILocation(line: 0, scope: !19) 120!32 = !DILocation(line: 10, column: 20, scope: !19) 121!33 = !DILocation(line: 10, column: 10, scope: !19) 122!34 = !DILocation(line: 10, column: 3, scope: !19) 123