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; typedef struct v3 { int a; int b; } __v3; 6; #define _(x) (__builtin_preserve_access_index(x)) 7; int get_value(const int *arg); 8; __v3 *g __attribute__((section("stats"))); 9; int test() { 10; return get_value(_(&g->b)); 11; } 12; Compilation flag: 13; clang -target bpf -O2 -g -S -emit-llvm -Xclang -disable-llvm-passes test.c 14 15target triple = "bpf" 16 17%struct.v3 = type { i32, i32 } 18 19@g = dso_local local_unnamed_addr global ptr null, section "stats", align 8, !dbg !0 20 21; Function Attrs: nounwind 22define dso_local i32 @test() local_unnamed_addr #0 !dbg !17 { 23entry: 24 %0 = load ptr, ptr @g, align 8, !dbg !20, !tbaa !21 25 %1 = tail call ptr @llvm.preserve.struct.access.index.p0.p0.v3s(ptr elementtype(%struct.v3) %0, i32 1, i32 1), !dbg !20, !llvm.preserve.access.index !8 26 %call = tail call i32 @get_value(ptr %1) #3, !dbg !25 27 ret i32 %call, !dbg !26 28} 29 30; CHECK: r2 = 4 31; CHECK: r1 += r2 32; CHECK: call get_value 33 34; CHECK: .long 16 # BTF_KIND_STRUCT(id = [[TID1:[0-9]+]]) 35 36; CHECK: .ascii ".text" # string offset=10 37; CHECK: .ascii "v3" # string offset=16 38; CHECK: .ascii "0:1" # string offset=23 39 40; CHECK: .long 16 # FieldReloc 41; CHECK-NEXT: .long 10 # Field reloc section string offset=10 42; CHECK-NEXT: .long 1 43; CHECK-NEXT: .long .Ltmp{{[0-9]+}} 44; CHECK-NEXT: .long [[TID1]] 45; CHECK-NEXT: .long 23 46; CHECK-NEXT: .long 0 47 48declare dso_local i32 @get_value(ptr) local_unnamed_addr #1 49 50; Function Attrs: nounwind readnone 51declare ptr @llvm.preserve.struct.access.index.p0.p0.v3s(ptr, i32, i32) #2 52 53attributes #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" } 54attributes #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" } 55attributes #2 = { nounwind readnone } 56attributes #3 = { nounwind } 57 58!llvm.dbg.cu = !{!2} 59!llvm.module.flags = !{!13, !14, !15} 60!llvm.ident = !{!16} 61 62!0 = !DIGlobalVariableExpression(var: !1, expr: !DIExpression()) 63!1 = distinct !DIGlobalVariable(name: "g", scope: !2, file: !3, line: 4, type: !6, isLocal: false, isDefinition: true) 64!2 = distinct !DICompileUnit(language: DW_LANG_C99, file: !3, producer: "clang version 10.0.0 (trunk 367256) (llvm/trunk 367266)", isOptimized: true, runtimeVersion: 0, emissionKind: FullDebug, enums: !4, globals: !5, nameTableKind: None) 65!3 = !DIFile(filename: "test.c", directory: "/tmp/home/yhs/work/tests/llvm/cast") 66!4 = !{} 67!5 = !{!0} 68!6 = !DIDerivedType(tag: DW_TAG_pointer_type, baseType: !7, size: 64) 69!7 = !DIDerivedType(tag: DW_TAG_typedef, name: "__v3", file: !3, line: 1, baseType: !8) 70!8 = distinct !DICompositeType(tag: DW_TAG_structure_type, name: "v3", file: !3, line: 1, size: 64, elements: !9) 71!9 = !{!10, !12} 72!10 = !DIDerivedType(tag: DW_TAG_member, name: "a", scope: !8, file: !3, line: 1, baseType: !11, size: 32) 73!11 = !DIBasicType(name: "int", size: 32, encoding: DW_ATE_signed) 74!12 = !DIDerivedType(tag: DW_TAG_member, name: "b", scope: !8, file: !3, line: 1, baseType: !11, size: 32, offset: 32) 75!13 = !{i32 2, !"Dwarf Version", i32 4} 76!14 = !{i32 2, !"Debug Info Version", i32 3} 77!15 = !{i32 1, !"wchar_size", i32 4} 78!16 = !{!"clang version 10.0.0 (trunk 367256) (llvm/trunk 367266)"} 79!17 = distinct !DISubprogram(name: "test", scope: !3, file: !3, line: 5, type: !18, scopeLine: 5, isDefinition: true, isOptimized: true, unit: !2, retainedNodes: !4) 80!18 = !DISubroutineType(types: !19) 81!19 = !{!11} 82!20 = !DILocation(line: 6, column: 20, scope: !17) 83!21 = !{!22, !22, i64 0} 84!22 = !{!"any pointer", !23, i64 0} 85!23 = !{!"omnipotent char", !24, i64 0} 86!24 = !{!"Simple C/C++ TBAA"} 87!25 = !DILocation(line: 6, column: 10, scope: !17) 88!26 = !DILocation(line: 6, column: 3, scope: !17) 89