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1; RUN: llc -mtriple=bpf -mcpu=v2 < %s | FileCheck -check-prefixes=CHECK %s2 3; Test for machine register liveness update bug in4; BPFMISimplifyPatchable::processDstReg.5;6; Generated from the following source code:7; struct t {8; unsigned long a;9; } __attribute__((preserve_access_index));10;11; void foo(volatile struct t *t, volatile unsigned long *p) {12; *p = t->a;13; *p = t->a;14; }15;16; Using the following command:17; clang -g -O2 -S -emit-llvm --target=bpf t.c -o t.ll18 19@"llvm.t:0:0$0:0" = external global i64, !llvm.preserve.access.index !0 #020 21; Function Attrs: nofree nounwind22define dso_local void @foo(ptr noundef %t, ptr noundef %p) local_unnamed_addr #1 !dbg !12 {23entry:24 call void @llvm.dbg.value(metadata ptr %t, metadata !20, metadata !DIExpression()), !dbg !2225 call void @llvm.dbg.value(metadata ptr %p, metadata !21, metadata !DIExpression()), !dbg !2226 %0 = load i64, ptr @"llvm.t:0:0$0:0", align 827 %1 = getelementptr i8, ptr %t, i64 %028 %2 = tail call ptr @llvm.bpf.passthrough.p0.p0(i32 0, ptr %1)29 %3 = load volatile i64, ptr %2, align 8, !dbg !23, !tbaa !2430 store volatile i64 %3, ptr %p, align 8, !dbg !29, !tbaa !3031 %4 = load i64, ptr @"llvm.t:0:0$0:0", align 832 %5 = getelementptr i8, ptr %t, i64 %433 %6 = tail call ptr @llvm.bpf.passthrough.p0.p0(i32 1, ptr %5)34 %7 = load volatile i64, ptr %6, align 8, !dbg !31, !tbaa !2435 store volatile i64 %7, ptr %p, align 8, !dbg !32, !tbaa !3036 ret void, !dbg !3337}38 39; CHECK: foo:40; CHECK: prologue_end41; CHECK-NEXT: .Ltmp[[LABEL1:.*]]:42; CHECK-NEXT: .Ltmp43; CHECK-NEXT: r[[#A:]] = *(u64 *)(r1 + 0)44; CHECK-NEXT: .loc45; CHECK-NEXT: .Ltmp46; CHECK-NEXT: *(u64 *)(r2 + 0) = r[[#A]]47; CHECK-NEXT: .loc48; CHECK-NEXT: .Ltmp[[LABEL2:.*]]:49; CHECK-NEXT: .Ltmp50; CHECK-NEXT: r[[#B:]] = *(u64 *)(r1 + 0)51; CHECK-NEXT: .Ltmp52; CHECK-NEXT: .Ltmp53; CHECK-NEXT: .loc54; CHECK-NEXT: .Ltmp55; CHECK-NEXT: *(u64 *)(r2 + 0) = r[[#B]]56 57; CHECK: .section .BTF58; CHECK: .long [[STR_T:.*]] # BTF_KIND_STRUCT(id = [[ID:.*]])59 60; CHECK: .byte 116 # string offset=[[STR_T]]61; CHECK: .ascii "0:0" # string offset=[[STR_A:.*]]62 63; CHECK: # FieldReloc64; CHECK: .long .Ltmp[[LABEL1]]65; CHECK-NEXT: .long [[ID]]66; CHECK-NEXT: .long [[STR_A]]67; CHECK-NEXT: .long 068; CHECK: .long .Ltmp[[LABEL2]]69; CHECK-NEXT: .long [[ID]]70; CHECK-NEXT: .long [[STR_A]]71; CHECK-NEXT: .long 072 73; Function Attrs: nofree nosync nounwind memory(none)74declare ptr @llvm.bpf.passthrough.p0.p0(i32, ptr) #275 76; Function Attrs: nocallback nofree nosync nounwind speculatable willreturn memory(none)77declare void @llvm.dbg.value(metadata, metadata, metadata) #378 79attributes #0 = { "btf_ama" }80attributes #1 = { nofree nounwind "frame-pointer"="all" "no-trapping-math"="true" "stack-protector-buffer-size"="8" }81attributes #2 = { nofree nosync nounwind memory(none) }82attributes #3 = { nocallback nofree nosync nounwind speculatable willreturn memory(none) }83 84!llvm.dbg.cu = !{!5}85!llvm.module.flags = !{!6, !7, !8, !9, !10}86!llvm.ident = !{!11}87 88!0 = distinct !DICompositeType(tag: DW_TAG_structure_type, name: "t", file: !1, line: 1, size: 64, elements: !2)89!1 = !DIFile(filename: "some.file", directory: "/some/dir", checksumkind: CSK_MD5, checksum: "a149cfaf65a83125e7f2b2f47e5c7287")90!2 = !{!3}91!3 = !DIDerivedType(tag: DW_TAG_member, name: "a", scope: !0, file: !1, line: 2, baseType: !4, size: 64)92!4 = !DIBasicType(name: "unsigned long", size: 64, encoding: DW_ATE_unsigned)93!5 = distinct !DICompileUnit(language: DW_LANG_C11, file: !1, producer: "clang version 18.0.0 (/home/eddy/work/llvm-project/clang 3810f2eb4382d5e2090ce5cd47f45379cb453c35)", isOptimized: true, runtimeVersion: 0, emissionKind: FullDebug, splitDebugInlining: false, nameTableKind: None)94!6 = !{i32 7, !"Dwarf Version", i32 5}95!7 = !{i32 2, !"Debug Info Version", i32 3}96!8 = !{i32 1, !"wchar_size", i32 4}97!9 = !{i32 7, !"frame-pointer", i32 2}98!10 = !{i32 7, !"debug-info-assignment-tracking", i1 true}99!11 = !{!"clang version 18.0.0 (/home/eddy/work/llvm-project/clang 3810f2eb4382d5e2090ce5cd47f45379cb453c35)"}100!12 = distinct !DISubprogram(name: "foo", scope: !1, file: !1, line: 4, type: !13, scopeLine: 4, flags: DIFlagPrototyped | DIFlagAllCallsDescribed, spFlags: DISPFlagDefinition | DISPFlagOptimized, unit: !5, retainedNodes: !19)101!13 = !DISubroutineType(types: !14)102!14 = !{null, !15, !17}103!15 = !DIDerivedType(tag: DW_TAG_pointer_type, baseType: !16, size: 64)104!16 = !DIDerivedType(tag: DW_TAG_volatile_type, baseType: !0)105!17 = !DIDerivedType(tag: DW_TAG_pointer_type, baseType: !18, size: 64)106!18 = !DIDerivedType(tag: DW_TAG_volatile_type, baseType: !4)107!19 = !{!20, !21}108!20 = !DILocalVariable(name: "t", arg: 1, scope: !12, file: !1, line: 4, type: !15)109!21 = !DILocalVariable(name: "p", arg: 2, scope: !12, file: !1, line: 4, type: !17)110!22 = !DILocation(line: 0, scope: !12)111!23 = !DILocation(line: 5, column: 11, scope: !12)112!24 = !{!25, !26, i64 0}113!25 = !{!"t", !26, i64 0}114!26 = !{!"long", !27, i64 0}115!27 = !{!"omnipotent char", !28, i64 0}116!28 = !{!"Simple C/C++ TBAA"}117!29 = !DILocation(line: 5, column: 6, scope: !12)118!30 = !{!26, !26, i64 0}119!31 = !DILocation(line: 6, column: 11, scope: !12)120!32 = !DILocation(line: 6, column: 6, scope: !12)121!33 = !DILocation(line: 7, column: 1, scope: !12)122