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1; RUN: opt -O2 %s | llvm-dis > %t12; RUN: llc -mcpu=v1 -filetype=asm -o - %t1 | FileCheck -check-prefixes=CHECK,CHECK-ALU64 %s3; RUN: llc -mcpu=v1 -mattr=+alu32 -filetype=asm -o - %t1 | FileCheck -check-prefixes=CHECK,CHECK-ALU32 %s4;5; Source Code:6; #define _(x) (__builtin_preserve_access_index(x))7; struct s {int a; int b;};8; int test(struct s *arg) { return *(const int *)_(&arg->b); }9; Compiler flag to generate IR:10; clang -target bpf -S -O2 -g -emit-llvm -Xclang -disable-llvm-passes test.c11 12target triple = "bpf"13 14%struct.s = type { i32, i32 }15 16; Function Attrs: nounwind readonly17define dso_local i32 @test(ptr readonly %arg) local_unnamed_addr !dbg !11 {18entry:19 call void @llvm.dbg.value(metadata ptr %arg, metadata !20, metadata !DIExpression()), !dbg !2120 %0 = tail call ptr @llvm.preserve.struct.access.index.p0.p0.ss(ptr elementtype(%struct.s) %arg, i32 1, i32 1), !dbg !22, !llvm.preserve.access.index !1521 %1 = load i32, ptr %0, align 4, !dbg !23, !tbaa !2422 ret i32 %1, !dbg !2823}24 25; CHECK-LABEL: test26; CHECK-ALU64: r0 = *(u32 *)(r1 + 4)27; CHECK-ALU32: w0 = *(u32 *)(r1 + 4)28; CHECK: exit29;30; CHECK: .long 1 # BTF_KIND_STRUCT(id = 2)31;32; CHECK: .byte 115 # string offset=133; CHECK: .ascii ".text" # string offset=2034; CHECK: .ascii "0:1" # string offset=2635;36; CHECK: .long 16 # FieldReloc37; CHECK-NEXT: .long 20 # Field reloc section string offset=2038; CHECK-NEXT: .long 139; CHECK-NEXT: .long .Ltmp{{[0-9]+}}40; CHECK-NEXT: .long 241; CHECK-NEXT: .long 2642; CHECK-NEXT: .long 043 44; Function Attrs: nounwind readnone45declare ptr @llvm.preserve.struct.access.index.p0.p0.ss(ptr, i32, i32)46 47; Function Attrs: nounwind readnone speculatable willreturn48declare void @llvm.dbg.value(metadata, metadata, metadata)49 50!llvm.dbg.cu = !{!0}51!llvm.module.flags = !{!7, !8, !9}52!llvm.ident = !{!10}53 54!0 = distinct !DICompileUnit(language: DW_LANG_C99, file: !1, producer: "clang version 10.0.0 (https://github.com/llvm/llvm-project.git 6e353b4df3aa452ed4741a5e5caea02b1a876d8c)", isOptimized: true, runtimeVersion: 0, emissionKind: FullDebug, enums: !2, retainedTypes: !3, nameTableKind: None)55!1 = !DIFile(filename: "test.c", directory: "/tmp/home/yhs/work/tests/core")56!2 = !{}57!3 = !{!4}58!4 = !DIDerivedType(tag: DW_TAG_pointer_type, baseType: !5, size: 64)59!5 = !DIDerivedType(tag: DW_TAG_const_type, baseType: !6)60!6 = !DIBasicType(name: "int", size: 32, encoding: DW_ATE_signed)61!7 = !{i32 2, !"Dwarf Version", i32 4}62!8 = !{i32 2, !"Debug Info Version", i32 3}63!9 = !{i32 1, !"wchar_size", i32 4}64!10 = !{!"clang version 10.0.0 (https://github.com/llvm/llvm-project.git 6e353b4df3aa452ed4741a5e5caea02b1a876d8c)"}65!11 = distinct !DISubprogram(name: "test", scope: !1, file: !1, line: 3, type: !12, scopeLine: 3, flags: DIFlagPrototyped, isDefinition: true, isOptimized: true, unit: !0, retainedNodes: !19)66!12 = !DISubroutineType(types: !13)67!13 = !{!6, !14}68!14 = !DIDerivedType(tag: DW_TAG_pointer_type, baseType: !15, size: 64)69!15 = distinct !DICompositeType(tag: DW_TAG_structure_type, name: "s", file: !1, line: 2, size: 64, elements: !16)70!16 = !{!17, !18}71!17 = !DIDerivedType(tag: DW_TAG_member, name: "a", scope: !15, file: !1, line: 2, baseType: !6, size: 32)72!18 = !DIDerivedType(tag: DW_TAG_member, name: "b", scope: !15, file: !1, line: 2, baseType: !6, size: 32, offset: 32)73!19 = !{!20}74!20 = !DILocalVariable(name: "arg", arg: 1, scope: !11, file: !1, line: 3, type: !14)75!21 = !DILocation(line: 0, scope: !11)76!22 = !DILocation(line: 3, column: 48, scope: !11)77!23 = !DILocation(line: 3, column: 34, scope: !11)78!24 = !{!25, !25, i64 0}79!25 = !{!"int", !26, i64 0}80!26 = !{!"omnipotent char", !27, i64 0}81!27 = !{!"Simple C/C++ TBAA"}82!28 = !DILocation(line: 3, column: 27, scope: !11)83