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; struct v1 {int a; int b;}; 6; typedef struct v1 __v1; 7; typedef __v1 arr[4][4]; 8; struct v3 { char c; int d[100]; }; 9; #define _(x) (__builtin_preserve_access_index(x)) 10; #define cast_to_arr(x) ((arr *)(x)) 11; int get_value(const int *arg); 12; int test(struct v3 *arg) { 13; return get_value(_(&cast_to_arr(&arg->d[0])[0][2][3].b)); 14; } 15; Compilation flag: 16; clang -target bpf -O2 -g -S -emit-llvm -Xclang -disable-llvm-passes test.c 17 18target triple = "bpf" 19 20%struct.v3 = type { i8, [100 x i32] } 21%struct.v1 = type { i32, i32 } 22 23; Function Attrs: nounwind 24define dso_local i32 @test(ptr %arg) local_unnamed_addr #0 !dbg !24 { 25entry: 26 call void @llvm.dbg.value(metadata ptr %arg, metadata !34, metadata !DIExpression()), !dbg !35 27 %0 = tail call ptr @llvm.preserve.struct.access.index.p0.p0(ptr elementtype(%struct.v3) %arg, i32 1, i32 1), !dbg !36, !llvm.preserve.access.index !28 28 %1 = tail call ptr @llvm.preserve.array.access.index.p0.p0(ptr elementtype([100 x i32]) %0, i32 1, i32 0), !dbg !36, !llvm.preserve.access.index !15 29 %2 = bitcast ptr %1 to ptr, !dbg !36 30 %3 = tail call ptr @llvm.preserve.array.access.index.p0.p0(ptr elementtype([4 x [4 x %struct.v1]]) %2, i32 0, i32 0), !dbg !36, !llvm.preserve.access.index !4 31 %4 = tail call ptr @llvm.preserve.array.access.index.p0.p0(ptr elementtype([4 x [4 x %struct.v1]]) %3, i32 1, i32 2), !dbg !36, !llvm.preserve.access.index !5 32 %5 = tail call ptr @llvm.preserve.array.access.index.p0.p0(ptr elementtype([4 x %struct.v1]) %4, i32 1, i32 3), !dbg !36, !llvm.preserve.access.index !18 33 %6 = tail call ptr @llvm.preserve.struct.access.index.p0.p0(ptr elementtype(%struct.v1) %5, i32 1, i32 1), !dbg !36, !llvm.preserve.access.index !8 34 %call = tail call i32 @get_value(ptr %6) #4, !dbg !37 35 ret i32 %call, !dbg !38 36} 37 38; CHECK: r2 = 4 39; CHECK: r1 += r2 40; CHECK: r2 = 92 41; CHECK: r1 += r2 42; CHECK: call get_value 43 44; CHECK: .long 1 # BTF_KIND_STRUCT(id = [[TID1:[0-9]+]]) 45; CHECK: .long 100 # BTF_KIND_STRUCT(id = [[TID2:[0-9]+]]) 46 47; CHECK: .ascii "v3" # string offset=1 48; CHECK: .ascii ".text" # string offset=46 49; CHECK: .ascii "0:1:0" # string offset=52 50; CHECK: .ascii "v1" # string offset=100 51; CHECK: .ascii "11:1" # string offset=107 52 53; CHECK: .long 16 # FieldReloc 54; CHECK-NEXT: .long 46 # Field reloc section string offset=46 55; CHECK-NEXT: .long 2 56; CHECK-NEXT: .long .Ltmp{{[0-9]+}} 57; CHECK-NEXT: .long [[TID1]] 58; CHECK-NEXT: .long 52 59; CHECK-NEXT: .long 0 60; CHECK-NEXT: .long .Ltmp{{[0-9]+}} 61; CHECK-NEXT: .long [[TID2]] 62; CHECK-NEXT: .long 107 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.struct.access.index.p0.p0(ptr, i32, 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 76 77; Function Attrs: nounwind readnone 78 79; Function Attrs: nounwind readnone 80 81; Function Attrs: nounwind readnone speculatable willreturn 82declare void @llvm.dbg.value(metadata, metadata, metadata) #3 83 84attributes #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" } 85attributes #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" } 86attributes #2 = { nounwind readnone } 87attributes #3 = { nounwind readnone speculatable willreturn } 88attributes #4 = { nounwind } 89 90!llvm.dbg.cu = !{!0} 91!llvm.module.flags = !{!20, !21, !22} 92!llvm.ident = !{!23} 93 94!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) 95!1 = !DIFile(filename: "test.c", directory: "/tmp/home/yhs/work/tests/llvm/cast") 96!2 = !{} 97!3 = !{!4, !15, !5, !18} 98!4 = !DIDerivedType(tag: DW_TAG_pointer_type, baseType: !5, size: 64) 99!5 = !DIDerivedType(tag: DW_TAG_typedef, name: "arr", file: !1, line: 3, baseType: !6) 100!6 = !DICompositeType(tag: DW_TAG_array_type, baseType: !7, size: 1024, elements: !13) 101!7 = !DIDerivedType(tag: DW_TAG_typedef, name: "__v1", file: !1, line: 2, baseType: !8) 102!8 = distinct !DICompositeType(tag: DW_TAG_structure_type, name: "v1", file: !1, line: 1, size: 64, elements: !9) 103!9 = !{!10, !12} 104!10 = !DIDerivedType(tag: DW_TAG_member, name: "a", scope: !8, file: !1, line: 1, baseType: !11, size: 32) 105!11 = !DIBasicType(name: "int", size: 32, encoding: DW_ATE_signed) 106!12 = !DIDerivedType(tag: DW_TAG_member, name: "b", scope: !8, file: !1, line: 1, baseType: !11, size: 32, offset: 32) 107!13 = !{!14, !14} 108!14 = !DISubrange(count: 4) 109!15 = !DICompositeType(tag: DW_TAG_array_type, baseType: !11, size: 3200, elements: !16) 110!16 = !{!17} 111!17 = !DISubrange(count: 100) 112!18 = !DICompositeType(tag: DW_TAG_array_type, baseType: !7, size: 256, elements: !19) 113!19 = !{!14} 114!20 = !{i32 2, !"Dwarf Version", i32 4} 115!21 = !{i32 2, !"Debug Info Version", i32 3} 116!22 = !{i32 1, !"wchar_size", i32 4} 117!23 = !{!"clang version 10.0.0 (trunk 367256) (llvm/trunk 367266)"} 118!24 = distinct !DISubprogram(name: "test", scope: !1, file: !1, line: 8, type: !25, scopeLine: 8, flags: DIFlagPrototyped, isDefinition: true, isOptimized: true, unit: !0, retainedNodes: !33) 119!25 = !DISubroutineType(types: !26) 120!26 = !{!11, !27} 121!27 = !DIDerivedType(tag: DW_TAG_pointer_type, baseType: !28, size: 64) 122!28 = distinct !DICompositeType(tag: DW_TAG_structure_type, name: "v3", file: !1, line: 4, size: 3232, elements: !29) 123!29 = !{!30, !32} 124!30 = !DIDerivedType(tag: DW_TAG_member, name: "c", scope: !28, file: !1, line: 4, baseType: !31, size: 8) 125!31 = !DIBasicType(name: "char", size: 8, encoding: DW_ATE_signed_char) 126!32 = !DIDerivedType(tag: DW_TAG_member, name: "d", scope: !28, file: !1, line: 4, baseType: !15, size: 3200, offset: 32) 127!33 = !{!34} 128!34 = !DILocalVariable(name: "arg", arg: 1, scope: !24, file: !1, line: 8, type: !27) 129!35 = !DILocation(line: 0, scope: !24) 130!36 = !DILocation(line: 9, column: 20, scope: !24) 131!37 = !DILocation(line: 9, column: 10, scope: !24) 132!38 = !DILocation(line: 9, column: 3, scope: !24) 133