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1; RUN: opt -passes=bpf-preserve-static-offset -mtriple=bpf-pc-linux -S -o - %s | FileCheck %s2;3; Source:4; #define __ctx __attribute__((preserve_static_offset))5; #define __pai __attribute__((preserve_access_index))6; 7; struct foo {8; char a[10];9; } __pai;10; 11; struct bar {12; int a;13; int b;14; } __pai;15; 16; union buz {17; struct foo a;18; struct bar b;19; } __pai __ctx;20; 21; int quux(union buz *p) {22; return p->b.b;23; }24;25; Compilation flag:26; clang -cc1 -O2 -triple bpf -S -emit-llvm -disable-llvm-passes -debug-info-kind=limited -o - \27; | opt -passes=function(sroa) -S -o -28 29%struct.bar = type { i32, i32 }30 31; Function Attrs: nounwind32define dso_local i32 @quux(ptr noundef %p) #0 !dbg !5 {33entry:34 call void @llvm.dbg.value(metadata ptr %p, metadata !26, metadata !DIExpression()), !dbg !2735 %0 = call ptr @llvm.preserve.static.offset(ptr %p), !dbg !2836 %1 = call ptr @llvm.preserve.union.access.index.p0.p0(ptr %0, i32 1), !dbg !28, !llvm.preserve.access.index !1037 %2 = call ptr @llvm.preserve.struct.access.index.p0.p0(ptr elementtype(%struct.bar) %1, i32 1, i32 1), !dbg !29, !llvm.preserve.access.index !2138 %3 = load i32, ptr %2, align 4, !dbg !29, !tbaa !3039 ret i32 %3, !dbg !3340}41 42; CHECK: define dso_local i32 @quux(ptr noundef %[[p:.*]]) {{.*}} {43; CHECK-NEXT: entry:44; CHECK-NEXT: #dbg_value45; CHECK-NEXT: %[[v5:.*]] = call i32 (ptr, i1, i8, i8, i8, i1, ...)46; CHECK-SAME: @llvm.bpf.getelementptr.and.load.i3247; CHECK-SAME: (ptr readonly elementtype(%struct.bar) %[[p]],48; CHECK-SAME: i1 false, i8 0, i8 1, i8 2, i1 true, i32 immarg 0, i32 immarg 1)49; CHECK-SAME: #[[v6:.*]], !tbaa50; CHECK-NEXT: ret i32 %[[v5]]51; CHECK-NEXT: }52; CHECK: attributes #[[v6]] = { memory(argmem: read) }53 54; Function Attrs: nocallback nofree nosync nounwind speculatable willreturn memory(none)55declare void @llvm.dbg.declare(metadata, metadata, metadata) #156 57; Function Attrs: nocallback nofree nosync nounwind speculatable willreturn memory(none)58declare ptr @llvm.preserve.static.offset(ptr readnone) #159 60; Function Attrs: nocallback nofree nosync nounwind willreturn memory(none)61declare ptr @llvm.preserve.union.access.index.p0.p0(ptr, i32 immarg) #262 63; Function Attrs: nocallback nofree nosync nounwind willreturn memory(none)64declare ptr @llvm.preserve.struct.access.index.p0.p0(ptr, i32 immarg, i32 immarg) #265 66; Function Attrs: nocallback nofree nosync nounwind speculatable willreturn memory(none)67declare void @llvm.dbg.value(metadata, metadata, metadata) #168 69attributes #0 = { nounwind "no-trapping-math"="true" "stack-protector-buffer-size"="8" }70attributes #1 = { nocallback nofree nosync nounwind speculatable willreturn memory(none) }71attributes #2 = { nocallback nofree nosync nounwind willreturn memory(none) }72 73!llvm.dbg.cu = !{!0}74!llvm.module.flags = !{!2, !3}75!llvm.ident = !{!4}76 77!0 = distinct !DICompileUnit(language: DW_LANG_C11, file: !1, producer: "clang", isOptimized: true, runtimeVersion: 0, emissionKind: FullDebug, splitDebugInlining: false, nameTableKind: None)78!1 = !DIFile(filename: "some-file.c", directory: "/some/dir/")79!2 = !{i32 2, !"Debug Info Version", i32 3}80!3 = !{i32 1, !"wchar_size", i32 4}81!4 = !{!"clang"}82!5 = distinct !DISubprogram(name: "quux", scope: !1, file: !1, line: 18, type: !6, scopeLine: 18, flags: DIFlagPrototyped, spFlags: DISPFlagDefinition | DISPFlagOptimized, unit: !0, retainedNodes: !25)83!6 = !DISubroutineType(types: !7)84!7 = !{!8, !9}85!8 = !DIBasicType(name: "int", size: 32, encoding: DW_ATE_signed)86!9 = !DIDerivedType(tag: DW_TAG_pointer_type, baseType: !10, size: 64)87!10 = distinct !DICompositeType(tag: DW_TAG_union_type, name: "buz", file: !1, line: 13, size: 96, elements: !11)88!11 = !{!12, !20}89!12 = !DIDerivedType(tag: DW_TAG_member, name: "a", scope: !10, file: !1, line: 14, baseType: !13, size: 80)90!13 = distinct !DICompositeType(tag: DW_TAG_structure_type, name: "foo", file: !1, line: 4, size: 80, elements: !14)91!14 = !{!15}92!15 = !DIDerivedType(tag: DW_TAG_member, name: "a", scope: !13, file: !1, line: 5, baseType: !16, size: 80)93!16 = !DICompositeType(tag: DW_TAG_array_type, baseType: !17, size: 80, elements: !18)94!17 = !DIBasicType(name: "char", size: 8, encoding: DW_ATE_signed_char)95!18 = !{!19}96!19 = !DISubrange(count: 10)97!20 = !DIDerivedType(tag: DW_TAG_member, name: "b", scope: !10, file: !1, line: 15, baseType: !21, size: 64)98!21 = distinct !DICompositeType(tag: DW_TAG_structure_type, name: "bar", file: !1, line: 8, size: 64, elements: !22)99!22 = !{!23, !24}100!23 = !DIDerivedType(tag: DW_TAG_member, name: "a", scope: !21, file: !1, line: 9, baseType: !8, size: 32)101!24 = !DIDerivedType(tag: DW_TAG_member, name: "b", scope: !21, file: !1, line: 10, baseType: !8, size: 32, offset: 32)102!25 = !{!26}103!26 = !DILocalVariable(name: "p", arg: 1, scope: !5, file: !1, line: 18, type: !9)104!27 = !DILocation(line: 0, scope: !5)105!28 = !DILocation(line: 19, column: 13, scope: !5)106!29 = !DILocation(line: 19, column: 15, scope: !5)107!30 = !{!31, !31, i64 0}108!31 = !{!"omnipotent char", !32, i64 0}109!32 = !{!"Simple C/C++ TBAA"}110!33 = !DILocation(line: 19, column: 3, scope: !5)111