1; RUN: opt -passes=bpf-preserve-static-offset -mtriple=bpf-pc-linux -S -o - %s | FileCheck %s 2; 3; Source: 4; #define __ctx __attribute__((preserve_static_offset)) 5; #define __pai __attribute__((preserve_access_index)) 6; 7; struct bar { 8; int a[7]; 9; } __pai __ctx; 10; 11; int buz(struct bar *p) { 12; return p->a[5]; 13; } 14; 15; Compilation flag: 16; clang -cc1 -O2 -triple bpf -S -emit-llvm -disable-llvm-passes -debug-info-kind=limited -o - \ 17; | opt -passes=function(sroa) -S -o - 18 19%struct.bar = type { [7 x i32] } 20 21; Function Attrs: nounwind 22define dso_local i32 @buz(ptr noundef %p) #0 !dbg !10 { 23entry: 24 call void @llvm.dbg.value(metadata ptr %p, metadata !18, metadata !DIExpression()), !dbg !19 25 %0 = call ptr @llvm.preserve.static.offset(ptr %p), !dbg !20 26 %1 = call ptr @llvm.preserve.struct.access.index.p0.p0(ptr elementtype(%struct.bar) %0, i32 0, i32 0), !dbg !20, !llvm.preserve.access.index !14 27 %2 = call ptr @llvm.preserve.array.access.index.p0.p0(ptr elementtype([7 x i32]) %1, i32 1, i32 5), !dbg !21, !llvm.preserve.access.index !3 28 %3 = load i32, ptr %2, align 4, !dbg !21, !tbaa !22 29 ret i32 %3, !dbg !26 30} 31 32; CHECK: define dso_local i32 @buz(ptr noundef %[[p:.*]]) {{.*}} { 33; CHECK-NEXT: entry: 34; CHECK-NEXT: #dbg_value 35; CHECK-NEXT: %[[v5:.*]] = call i32 (ptr, i1, i8, i8, i8, i1, ...) 36; CHECK-SAME: @llvm.bpf.getelementptr.and.load.i32 37; CHECK-SAME: (ptr readonly elementtype(%struct.bar) %[[p]], 38; CHECK-SAME: i1 false, i8 0, i8 1, i8 2, i1 true, i32 immarg 0, i32 immarg 0, i32 immarg 5) 39; CHECK-SAME: #[[v6:.*]], !tbaa 40; CHECK-NEXT: ret i32 %[[v5]] 41; CHECK-NEXT: } 42; CHECK: attributes #[[v6]] = { memory(argmem: read) } 43 44; Function Attrs: nocallback nofree nosync nounwind speculatable willreturn memory(none) 45declare void @llvm.dbg.declare(metadata, metadata, metadata) #1 46 47; Function Attrs: nocallback nofree nosync nounwind speculatable willreturn memory(none) 48declare ptr @llvm.preserve.static.offset(ptr readnone) #1 49 50; Function Attrs: nocallback nofree nosync nounwind willreturn memory(none) 51declare ptr @llvm.preserve.struct.access.index.p0.p0(ptr, i32 immarg, i32 immarg) #2 52 53; Function Attrs: nocallback nofree nosync nounwind willreturn memory(none) 54declare ptr @llvm.preserve.array.access.index.p0.p0(ptr, i32 immarg, i32 immarg) #2 55 56; Function Attrs: nocallback nofree nosync nounwind speculatable willreturn memory(none) 57declare void @llvm.dbg.value(metadata, metadata, metadata) #1 58 59attributes #0 = { nounwind "no-trapping-math"="true" "stack-protector-buffer-size"="8" } 60attributes #1 = { nocallback nofree nosync nounwind speculatable willreturn memory(none) } 61attributes #2 = { nocallback nofree nosync nounwind willreturn memory(none) } 62 63!llvm.dbg.cu = !{!0} 64!llvm.module.flags = !{!7, !8} 65!llvm.ident = !{!9} 66 67!0 = distinct !DICompileUnit(language: DW_LANG_C11, file: !1, producer: "clang", isOptimized: true, runtimeVersion: 0, emissionKind: FullDebug, retainedTypes: !2, splitDebugInlining: false, nameTableKind: None) 68!1 = !DIFile(filename: "some-file.c", directory: "/some/dir/") 69!2 = !{!3} 70!3 = !DICompositeType(tag: DW_TAG_array_type, baseType: !4, size: 224, elements: !5) 71!4 = !DIBasicType(name: "int", size: 32, encoding: DW_ATE_signed) 72!5 = !{!6} 73!6 = !DISubrange(count: 7) 74!7 = !{i32 2, !"Debug Info Version", i32 3} 75!8 = !{i32 1, !"wchar_size", i32 4} 76!9 = !{!"clang"} 77!10 = distinct !DISubprogram(name: "buz", scope: !1, file: !1, line: 8, type: !11, scopeLine: 8, flags: DIFlagPrototyped, spFlags: DISPFlagDefinition | DISPFlagOptimized, unit: !0, retainedNodes: !17) 78!11 = !DISubroutineType(types: !12) 79!12 = !{!4, !13} 80!13 = !DIDerivedType(tag: DW_TAG_pointer_type, baseType: !14, size: 64) 81!14 = distinct !DICompositeType(tag: DW_TAG_structure_type, name: "bar", file: !1, line: 4, size: 224, elements: !15) 82!15 = !{!16} 83!16 = !DIDerivedType(tag: DW_TAG_member, name: "a", scope: !14, file: !1, line: 5, baseType: !3, size: 224) 84!17 = !{!18} 85!18 = !DILocalVariable(name: "p", arg: 1, scope: !10, file: !1, line: 8, type: !13) 86!19 = !DILocation(line: 0, scope: !10) 87!20 = !DILocation(line: 9, column: 13, scope: !10) 88!21 = !DILocation(line: 9, column: 10, scope: !10) 89!22 = !{!23, !23, i64 0} 90!23 = !{!"int", !24, i64 0} 91!24 = !{!"omnipotent char", !25, i64 0} 92!25 = !{!"Simple C/C++ TBAA"} 93!26 = !DILocation(line: 9, column: 3, scope: !10) 94