1; RUN: llc -mtriple=bpf -mcpu=v2 < %s | FileCheck -check-prefixes=CHECK %s 2 3; Test for machine register liveness update bug in 4; 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.ll 18 19@"llvm.t:0:0$0:0" = external global i64, !llvm.preserve.access.index !0 #0 20 21; Function Attrs: nofree nounwind 22define 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 !22 25 call void @llvm.dbg.value(metadata ptr %p, metadata !21, metadata !DIExpression()), !dbg !22 26 %0 = load i64, ptr @"llvm.t:0:0$0:0", align 8 27 %1 = getelementptr i8, ptr %t, i64 %0 28 %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 !24 30 store volatile i64 %3, ptr %p, align 8, !dbg !29, !tbaa !30 31 %4 = load i64, ptr @"llvm.t:0:0$0:0", align 8 32 %5 = getelementptr i8, ptr %t, i64 %4 33 %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 !24 35 store volatile i64 %7, ptr %p, align 8, !dbg !32, !tbaa !30 36 ret void, !dbg !33 37} 38 39; CHECK: foo: 40; CHECK: prologue_end 41; CHECK-NEXT: .Ltmp[[LABEL1:.*]]: 42; CHECK-NEXT: .Ltmp 43; CHECK-NEXT: r[[#A:]] = *(u64 *)(r1 + 0) 44; CHECK-NEXT: .loc 45; CHECK-NEXT: .Ltmp 46; CHECK-NEXT: *(u64 *)(r2 + 0) = r[[#A]] 47; CHECK-NEXT: .loc 48; CHECK-NEXT: .Ltmp[[LABEL2:.*]]: 49; CHECK-NEXT: .Ltmp 50; CHECK-NEXT: r[[#B:]] = *(u64 *)(r1 + 0) 51; CHECK-NEXT: .Ltmp 52; CHECK-NEXT: .Ltmp 53; CHECK-NEXT: .loc 54; CHECK-NEXT: .Ltmp 55; CHECK-NEXT: *(u64 *)(r2 + 0) = r[[#B]] 56 57; CHECK: .section .BTF 58; 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: # FieldReloc 64; CHECK: .long .Ltmp[[LABEL1]] 65; CHECK-NEXT: .long [[ID]] 66; CHECK-NEXT: .long [[STR_A]] 67; CHECK-NEXT: .long 0 68; CHECK: .long .Ltmp[[LABEL2]] 69; CHECK-NEXT: .long [[ID]] 70; CHECK-NEXT: .long [[STR_A]] 71; CHECK-NEXT: .long 0 72 73; Function Attrs: nofree nosync nounwind memory(none) 74declare ptr @llvm.bpf.passthrough.p0.p0(i32, ptr) #2 75 76; Function Attrs: nocallback nofree nosync nounwind speculatable willreturn memory(none) 77declare void @llvm.dbg.value(metadata, metadata, metadata) #3 78 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