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1; RUN: llc -O2 -mtriple=bpf -mcpu=v3 < %s | FileCheck %s2; Source code:3; struct t3 {4; int i;5; } __attribute__((preserve_access_index));6; struct t2 {7; void *pad;8; struct t3 *f;9; } __attribute__((preserve_access_index));10; struct t1 {11; void *pad;12; struct t2 *q;13; } __attribute__((preserve_access_index));14;15; int g;16; int test(struct t1 *p) {17; struct t2 *q = p->q;18; if (q)19; return 0;20; struct t3 *f = q->f;21; if (!f) g = 5;22; return 0;23; }24; Compilation flag:25; clang -target bpf -O2 -g -S -emit-llvm t.c26 27@g = dso_local local_unnamed_addr global i32 0, align 4, !dbg !028@"llvm.t2:0:8$0:1" = external global i64, !llvm.preserve.access.index !6 #029@"llvm.t1:0:8$0:1" = external global i64, !llvm.preserve.access.index !15 #030 31; Function Attrs: mustprogress nofree nosync nounwind willreturn32define dso_local i32 @test(ptr noundef readonly %p) local_unnamed_addr #1 !dbg !25 {33entry:34 call void @llvm.dbg.value(metadata ptr %p, metadata !30, metadata !DIExpression()), !dbg !3335 %0 = load i64, ptr @"llvm.t1:0:8$0:1", align 836 %1 = getelementptr i8, ptr %p, i64 %037 %2 = tail call ptr @llvm.bpf.passthrough.p0.p0(i32 1, ptr %1)38 %3 = load ptr, ptr %2, align 8, !dbg !34, !tbaa !3539 call void @llvm.dbg.value(metadata ptr %3, metadata !31, metadata !DIExpression()), !dbg !3340 %tobool.not = icmp eq ptr %3, null, !dbg !4041 br i1 %tobool.not, label %if.end, label %cleanup, !dbg !4242 43; CHECK-LABEL: test44; CHECK: r1 = *(u64 *)(r1 + 8)45; CHECK: if r1 != 0 goto46 47if.end: ; preds = %entry48 %4 = load i64, ptr @"llvm.t2:0:8$0:1", align 849 %5 = getelementptr i8, ptr null, i64 %450 %6 = tail call ptr @llvm.bpf.passthrough.p0.p0(i32 0, ptr %5)51 %7 = load ptr, ptr %6, align 8, !dbg !43, !tbaa !4452 call void @llvm.dbg.value(metadata ptr %7, metadata !32, metadata !DIExpression()), !dbg !3353 %tobool1.not = icmp eq ptr %7, null, !dbg !4654 br i1 %tobool1.not, label %if.then2, label %cleanup, !dbg !4855 56; CHECK: r1 = 857; CHECK: r1 = *(u64 *)(r1 + 0)58; CHECK: if r1 != 0 goto59 60if.then2: ; preds = %if.end61 store i32 5, ptr @g, align 4, !dbg !49, !tbaa !5062 br label %cleanup, !dbg !5263 64cleanup: ; preds = %if.end, %if.then2, %entry65 ret i32 0, !dbg !5366}67 68; Function Attrs: nofree nosync nounwind readnone69declare ptr @llvm.bpf.passthrough.p0.p0(i32, ptr) #270 71; Function Attrs: nocallback nofree nosync nounwind readnone speculatable willreturn72declare void @llvm.dbg.value(metadata, metadata, metadata) #373 74attributes #0 = { "btf_ama" }75attributes #1 = { mustprogress nofree nosync nounwind willreturn "frame-pointer"="all" "min-legal-vector-width"="0" "no-trapping-math"="true" "stack-protector-buffer-size"="8" }76attributes #2 = { nofree nosync nounwind readnone }77attributes #3 = { nocallback nofree nosync nounwind readnone speculatable willreturn }78 79!llvm.dbg.cu = !{!2}80!llvm.module.flags = !{!20, !21, !22, !23}81!llvm.ident = !{!24}82 83!0 = !DIGlobalVariableExpression(var: !1, expr: !DIExpression())84!1 = distinct !DIGlobalVariable(name: "g", scope: !2, file: !3, line: 13, type: !5, isLocal: false, isDefinition: true)85!2 = distinct !DICompileUnit(language: DW_LANG_C99, file: !3, producer: "clang version 15.0.0 (https://github.com/llvm/llvm-project.git ca2be81e34a6d87edb8e555dfac94ab68ee20f70)", isOptimized: true, runtimeVersion: 0, emissionKind: FullDebug, globals: !4, splitDebugInlining: false, nameTableKind: None)86!3 = !DIFile(filename: "t.c", directory: "/tmp/home/yhs/work/tests/llvm/nullptr", checksumkind: CSK_MD5, checksum: "2c0ea9b3c647baf31f56992f9142b0df")87!4 = !{!0}88!5 = !DIBasicType(name: "int", size: 32, encoding: DW_ATE_signed)89!6 = distinct !DICompositeType(tag: DW_TAG_structure_type, name: "t2", file: !3, line: 4, size: 128, elements: !7)90!7 = !{!8, !10}91!8 = !DIDerivedType(tag: DW_TAG_member, name: "pad", scope: !6, file: !3, line: 5, baseType: !9, size: 64)92!9 = !DIDerivedType(tag: DW_TAG_pointer_type, baseType: null, size: 64)93!10 = !DIDerivedType(tag: DW_TAG_member, name: "f", scope: !6, file: !3, line: 6, baseType: !11, size: 64, offset: 64)94!11 = !DIDerivedType(tag: DW_TAG_pointer_type, baseType: !12, size: 64)95!12 = distinct !DICompositeType(tag: DW_TAG_structure_type, name: "t3", file: !3, line: 1, size: 32, elements: !13)96!13 = !{!14}97!14 = !DIDerivedType(tag: DW_TAG_member, name: "i", scope: !12, file: !3, line: 2, baseType: !5, size: 32)98!15 = distinct !DICompositeType(tag: DW_TAG_structure_type, name: "t1", file: !3, line: 8, size: 128, elements: !16)99!16 = !{!17, !18}100!17 = !DIDerivedType(tag: DW_TAG_member, name: "pad", scope: !15, file: !3, line: 9, baseType: !9, size: 64)101!18 = !DIDerivedType(tag: DW_TAG_member, name: "q", scope: !15, file: !3, line: 10, baseType: !19, size: 64, offset: 64)102!19 = !DIDerivedType(tag: DW_TAG_pointer_type, baseType: !6, size: 64)103!20 = !{i32 7, !"Dwarf Version", i32 5}104!21 = !{i32 2, !"Debug Info Version", i32 3}105!22 = !{i32 1, !"wchar_size", i32 4}106!23 = !{i32 7, !"frame-pointer", i32 2}107!24 = !{!"clang version 15.0.0 (https://github.com/llvm/llvm-project.git ca2be81e34a6d87edb8e555dfac94ab68ee20f70)"}108!25 = distinct !DISubprogram(name: "test", scope: !3, file: !3, line: 14, type: !26, scopeLine: 14, flags: DIFlagPrototyped | DIFlagAllCallsDescribed, spFlags: DISPFlagDefinition | DISPFlagOptimized, unit: !2, retainedNodes: !29)109!26 = !DISubroutineType(types: !27)110!27 = !{!5, !28}111!28 = !DIDerivedType(tag: DW_TAG_pointer_type, baseType: !15, size: 64)112!29 = !{!30, !31, !32}113!30 = !DILocalVariable(name: "p", arg: 1, scope: !25, file: !3, line: 14, type: !28)114!31 = !DILocalVariable(name: "q", scope: !25, file: !3, line: 15, type: !19)115!32 = !DILocalVariable(name: "f", scope: !25, file: !3, line: 18, type: !11)116!33 = !DILocation(line: 0, scope: !25)117!34 = !DILocation(line: 15, column: 21, scope: !25)118!35 = !{!36, !37, i64 8}119!36 = !{!"t1", !37, i64 0, !37, i64 8}120!37 = !{!"any pointer", !38, i64 0}121!38 = !{!"omnipotent char", !39, i64 0}122!39 = !{!"Simple C/C++ TBAA"}123!40 = !DILocation(line: 16, column: 7, scope: !41)124!41 = distinct !DILexicalBlock(scope: !25, file: !3, line: 16, column: 7)125!42 = !DILocation(line: 16, column: 7, scope: !25)126!43 = !DILocation(line: 18, column: 21, scope: !25)127!44 = !{!45, !37, i64 8}128!45 = !{!"t2", !37, i64 0, !37, i64 8}129!46 = !DILocation(line: 19, column: 8, scope: !47)130!47 = distinct !DILexicalBlock(scope: !25, file: !3, line: 19, column: 7)131!48 = !DILocation(line: 19, column: 7, scope: !25)132!49 = !DILocation(line: 19, column: 13, scope: !47)133!50 = !{!51, !51, i64 0}134!51 = !{!"int", !38, i64 0}135!52 = !DILocation(line: 19, column: 11, scope: !47)136!53 = !DILocation(line: 21, column: 1, scope: !25)137