xref: /llvm-project/llvm/test/CodeGen/BPF/preserve-static-offset/load-struct-pai.ll (revision 094572701dce4aaf36f4521d6cf750420d39f206) 
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 foo {
8;      int a;
9;      int b;
10;    };
11;
12;    struct bar {
13;      int _1;
14;      int _2;
15;      struct foo c;
16;    } __pai __ctx;
17;
18;    int buz(struct bar *p) {
19;      return p->c.b;
20;    }
21;
22; Compilation flag:
23;   clang -cc1 -O2 -triple bpf -S -emit-llvm -disable-llvm-passes \
24;         -debug-info-kind=limited -o - \
25;       | opt -passes=function(sroa) -S -o -
26
27%struct.bar = type { i32, i32, %struct.foo }
28%struct.foo = type { i32, i32 }
29
30; Function Attrs: nounwind
31define dso_local i32 @buz(ptr noundef %p) #0 !dbg !5 {
32entry:
33  call void @llvm.dbg.value(metadata ptr %p, metadata !20, metadata !DIExpression()), !dbg !21
34  %0 = call ptr @llvm.preserve.static.offset(ptr %p), !dbg !22
35  %1 = call ptr @llvm.preserve.struct.access.index.p0.p0(ptr elementtype(%struct.bar) %0, i32 2, i32 2), !dbg !22, !llvm.preserve.access.index !10
36  %b = getelementptr inbounds %struct.foo, ptr %1, i32 0, i32 1, !dbg !23
37  %2 = load i32, ptr %b, align 4, !dbg !23, !tbaa !24
38  ret i32 %2, !dbg !30
39}
40
41; CHECK:      define dso_local i32 @buz(ptr noundef %[[p:.*]]) {{.*}} {
42; CHECK-NEXT: entry:
43; CHECK-NEXT:   #dbg_value
44; CHECK-NEXT:   %[[b1:.*]] = call i32 (ptr, i1, i8, i8, i8, i1, ...)
45; CHECK-SAME:     @llvm.bpf.getelementptr.and.load.i32
46; CHECK-SAME:       (ptr readonly elementtype(%struct.bar) %[[p]],
47; CHECK-SAME:        i1 false, i8 0, i8 1, i8 2, i1 true, i32 immarg 0, i32 immarg 2, i32 immarg 1)
48; CHECK-SAME:      #[[v5:.*]], !tbaa
49; CHECK-NEXT:   ret i32 %[[b1]]
50; CHECK-NEXT: }
51
52; CHECK:      attributes #[[v5]] = { memory(argmem: read) }
53
54
55; Function Attrs: nocallback nofree nosync nounwind speculatable willreturn memory(none)
56declare void @llvm.dbg.declare(metadata, metadata, metadata) #1
57
58; Function Attrs: nocallback nofree nosync nounwind speculatable willreturn memory(none)
59declare ptr @llvm.preserve.static.offset(ptr readnone) #1
60
61; Function Attrs: nocallback nofree nosync nounwind willreturn memory(none)
62declare ptr @llvm.preserve.struct.access.index.p0.p0(ptr, i32 immarg, i32 immarg) #2
63
64; Function Attrs: nocallback nofree nosync nounwind speculatable willreturn memory(none)
65declare void @llvm.dbg.value(metadata, metadata, metadata) #1
66
67attributes #0 = { nounwind "no-trapping-math"="true" "stack-protector-buffer-size"="8" }
68attributes #1 = { nocallback nofree nosync nounwind speculatable willreturn memory(none) }
69attributes #2 = { nocallback nofree nosync nounwind willreturn memory(none) }
70
71!llvm.dbg.cu = !{!0}
72!llvm.module.flags = !{!2, !3}
73!llvm.ident = !{!4}
74
75!0 = distinct !DICompileUnit(language: DW_LANG_C11, file: !1, producer: "clang", isOptimized: true, runtimeVersion: 0, emissionKind: FullDebug, splitDebugInlining: false, nameTableKind: None)
76!1 = !DIFile(filename: "some-file.c", directory: "/some/dir/")
77!2 = !{i32 2, !"Debug Info Version", i32 3}
78!3 = !{i32 1, !"wchar_size", i32 4}
79!4 = !{!"clang"}
80!5 = distinct !DISubprogram(name: "buz", scope: !1, file: !1, line: 15, type: !6, scopeLine: 15, flags: DIFlagPrototyped, spFlags: DISPFlagDefinition | DISPFlagOptimized, unit: !0, retainedNodes: !19)
81!6 = !DISubroutineType(types: !7)
82!7 = !{!8, !9}
83!8 = !DIBasicType(name: "int", size: 32, encoding: DW_ATE_signed)
84!9 = !DIDerivedType(tag: DW_TAG_pointer_type, baseType: !10, size: 64)
85!10 = distinct !DICompositeType(tag: DW_TAG_structure_type, name: "bar", file: !1, line: 9, size: 128, elements: !11)
86!11 = !{!12, !13, !14}
87!12 = !DIDerivedType(tag: DW_TAG_member, name: "_1", scope: !10, file: !1, line: 10, baseType: !8, size: 32)
88!13 = !DIDerivedType(tag: DW_TAG_member, name: "_2", scope: !10, file: !1, line: 11, baseType: !8, size: 32, offset: 32)
89!14 = !DIDerivedType(tag: DW_TAG_member, name: "c", scope: !10, file: !1, line: 12, baseType: !15, size: 64, offset: 64)
90!15 = distinct !DICompositeType(tag: DW_TAG_structure_type, name: "foo", file: !1, line: 4, size: 64, elements: !16)
91!16 = !{!17, !18}
92!17 = !DIDerivedType(tag: DW_TAG_member, name: "a", scope: !15, file: !1, line: 5, baseType: !8, size: 32)
93!18 = !DIDerivedType(tag: DW_TAG_member, name: "b", scope: !15, file: !1, line: 6, baseType: !8, size: 32, offset: 32)
94!19 = !{!20}
95!20 = !DILocalVariable(name: "p", arg: 1, scope: !5, file: !1, line: 15, type: !9)
96!21 = !DILocation(line: 0, scope: !5)
97!22 = !DILocation(line: 16, column: 13, scope: !5)
98!23 = !DILocation(line: 16, column: 15, scope: !5)
99!24 = !{!25, !26, i64 12}
100!25 = !{!"bar", !26, i64 0, !26, i64 4, !29, i64 8}
101!26 = !{!"int", !27, i64 0}
102!27 = !{!"omnipotent char", !28, i64 0}
103!28 = !{!"Simple C/C++ TBAA"}
104!29 = !{!"foo", !26, i64 0, !26, i64 4}
105!30 = !DILocation(line: 16, column: 3, scope: !5)
106