123 lines
6.7 KiB
LLVM
123 lines
6.7 KiB
LLVM
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; RUN: opt -O2 %s | llvm-dis > %t1
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; RUN: llc -filetype=asm -o - %t1 | FileCheck -check-prefixes=CHECK %s
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; RUN: llc -mattr=+alu32 -filetype=asm -o - %t1 | FileCheck -check-prefixes=CHECK %s
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; Source code:
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; union v1 { int a; int b; };
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; typedef union v1 __v1;
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; union v2 { int c; int d; };
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; typedef union v2 __v2;
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; union v3 { char c; volatile const __v2 d; };
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; typedef union v3 __v3;
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; #define _(x) (__builtin_preserve_access_index(x))
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; #define cast_to_v1(x) ((__v1 *)(x))
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; int get_value(const int *arg);
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; int test(__v3 *arg) {
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; return get_value(_(&cast_to_v1(&arg->d)->b));
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; }
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; Compilation flag:
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; clang -target bpf -O2 -g -S -emit-llvm -Xclang -disable-llvm-passes test.c
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target triple = "bpf"
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%union.v3 = type { %union.v2 }
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%union.v2 = type { i32 }
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%union.v1 = type { i32 }
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; Function Attrs: nounwind
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define dso_local i32 @test(%union.v3* %arg) local_unnamed_addr #0 !dbg !15 {
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entry:
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call void @llvm.dbg.value(metadata %union.v3* %arg, metadata !33, metadata !DIExpression()), !dbg !34
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%0 = tail call %union.v3* @llvm.preserve.union.access.index.p0s_union.v3s.p0s_union.v3s(%union.v3* %arg, i32 1), !dbg !35, !llvm.preserve.access.index !20
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%1 = bitcast %union.v3* %0 to %union.v1*, !dbg !35
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%2 = tail call %union.v1* @llvm.preserve.union.access.index.p0s_union.v1s.p0s_union.v1s(%union.v1* %1, i32 1), !dbg !35, !llvm.preserve.access.index !6
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%b = getelementptr inbounds %union.v1, %union.v1* %2, i64 0, i32 0, !dbg !35
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%call = tail call i32 @get_value(i32* %b) #4, !dbg !36
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ret i32 %call, !dbg !37
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}
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; CHECK: r2 = 0
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; CHECK: r1 += r2
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; CHECK: r2 = 0
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; CHECK: r1 += r2
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; CHECK: call get_value
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; CHECK: .long 6 # BTF_KIND_UNION(id = [[TID1:[0-9]+]])
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; CHECK: .long 91 # BTF_KIND_UNION(id = [[TID2:[0-9]+]])
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; CHECK: .ascii "v3" # string offset=6
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; CHECK: .ascii ".text" # string offset=39
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; CHECK: .ascii "0:1" # string offset=45
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; CHECK: .ascii "v1" # string offset=91
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; CHECK: .long 16 # FieldReloc
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; CHECK-NEXT: .long 39 # Field reloc section string offset=39
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; CHECK-NEXT: .long 2
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; CHECK-NEXT: .long .Ltmp{{[0-9]+}}
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; CHECK-NEXT: .long [[TID1]]
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; CHECK-NEXT: .long 45
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; CHECK-NEXT: .long 0
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; CHECK-NEXT: .long .Ltmp{{[0-9]+}}
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; CHECK-NEXT: .long [[TID2]]
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; CHECK-NEXT: .long 45
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; CHECK-NEXT: .long 0
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declare dso_local i32 @get_value(i32*) local_unnamed_addr #1
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; Function Attrs: nounwind readnone
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declare %union.v3* @llvm.preserve.union.access.index.p0s_union.v3s.p0s_union.v3s(%union.v3*, i32) #2
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; Function Attrs: nounwind readnone
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declare %union.v1* @llvm.preserve.union.access.index.p0s_union.v1s.p0s_union.v1s(%union.v1*, i32) #2
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; Function Attrs: nounwind readnone speculatable willreturn
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declare void @llvm.dbg.value(metadata, metadata, metadata) #3
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attributes #0 = { nounwind "correctly-rounded-divide-sqrt-fp-math"="false" "disable-tail-calls"="false" "frame-pointer"="all" "less-precise-fpmad"="false" "min-legal-vector-width"="0" "no-infs-fp-math"="false" "no-jump-tables"="false" "no-nans-fp-math"="false" "no-signed-zeros-fp-math"="false" "no-trapping-math"="false" "stack-protector-buffer-size"="8" "unsafe-fp-math"="false" "use-soft-float"="false" }
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attributes #1 = { "correctly-rounded-divide-sqrt-fp-math"="false" "disable-tail-calls"="false" "frame-pointer"="all" "less-precise-fpmad"="false" "no-infs-fp-math"="false" "no-nans-fp-math"="false" "no-signed-zeros-fp-math"="false" "no-trapping-math"="false" "stack-protector-buffer-size"="8" "unsafe-fp-math"="false" "use-soft-float"="false" }
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attributes #2 = { nounwind readnone }
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attributes #3 = { nounwind readnone speculatable willreturn }
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attributes #4 = { nounwind }
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!llvm.dbg.cu = !{!0}
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!llvm.module.flags = !{!11, !12, !13}
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!llvm.ident = !{!14}
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!0 = distinct !DICompileUnit(language: DW_LANG_C99, file: !1, producer: "clang version 10.0.0 (trunk 367256) (llvm/trunk 367266)", isOptimized: true, runtimeVersion: 0, emissionKind: FullDebug, enums: !2, retainedTypes: !3, nameTableKind: None)
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!1 = !DIFile(filename: "test.c", directory: "/tmp/home/yhs/work/tests/llvm/cast")
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!2 = !{}
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!3 = !{!4}
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!4 = !DIDerivedType(tag: DW_TAG_pointer_type, baseType: !5, size: 64)
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!5 = !DIDerivedType(tag: DW_TAG_typedef, name: "__v1", file: !1, line: 2, baseType: !6)
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!6 = distinct !DICompositeType(tag: DW_TAG_union_type, name: "v1", file: !1, line: 1, size: 32, elements: !7)
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!7 = !{!8, !10}
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!8 = !DIDerivedType(tag: DW_TAG_member, name: "a", scope: !6, file: !1, line: 1, baseType: !9, size: 32)
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!9 = !DIBasicType(name: "int", size: 32, encoding: DW_ATE_signed)
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!10 = !DIDerivedType(tag: DW_TAG_member, name: "b", scope: !6, file: !1, line: 1, baseType: !9, size: 32)
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!11 = !{i32 2, !"Dwarf Version", i32 4}
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!12 = !{i32 2, !"Debug Info Version", i32 3}
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!13 = !{i32 1, !"wchar_size", i32 4}
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!14 = !{!"clang version 10.0.0 (trunk 367256) (llvm/trunk 367266)"}
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!15 = distinct !DISubprogram(name: "test", scope: !1, file: !1, line: 10, type: !16, scopeLine: 10, flags: DIFlagPrototyped, isDefinition: true, isOptimized: true, unit: !0, retainedNodes: !32)
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!16 = !DISubroutineType(types: !17)
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!17 = !{!9, !18}
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!18 = !DIDerivedType(tag: DW_TAG_pointer_type, baseType: !19, size: 64)
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!19 = !DIDerivedType(tag: DW_TAG_typedef, name: "__v3", file: !1, line: 6, baseType: !20)
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!20 = distinct !DICompositeType(tag: DW_TAG_union_type, name: "v3", file: !1, line: 5, size: 32, elements: !21)
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!21 = !{!22, !24}
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!22 = !DIDerivedType(tag: DW_TAG_member, name: "c", scope: !20, file: !1, line: 5, baseType: !23, size: 8)
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!23 = !DIBasicType(name: "char", size: 8, encoding: DW_ATE_signed_char)
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!24 = !DIDerivedType(tag: DW_TAG_member, name: "d", scope: !20, file: !1, line: 5, baseType: !25, size: 32)
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!25 = !DIDerivedType(tag: DW_TAG_const_type, baseType: !26)
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!26 = !DIDerivedType(tag: DW_TAG_volatile_type, baseType: !27)
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!27 = !DIDerivedType(tag: DW_TAG_typedef, name: "__v2", file: !1, line: 4, baseType: !28)
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!28 = distinct !DICompositeType(tag: DW_TAG_union_type, name: "v2", file: !1, line: 3, size: 32, elements: !29)
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!29 = !{!30, !31}
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!30 = !DIDerivedType(tag: DW_TAG_member, name: "c", scope: !28, file: !1, line: 3, baseType: !9, size: 32)
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!31 = !DIDerivedType(tag: DW_TAG_member, name: "d", scope: !28, file: !1, line: 3, baseType: !9, size: 32)
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!32 = !{!33}
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!33 = !DILocalVariable(name: "arg", arg: 1, scope: !15, file: !1, line: 10, type: !18)
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!34 = !DILocation(line: 0, scope: !15)
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!35 = !DILocation(line: 11, column: 20, scope: !15)
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!36 = !DILocation(line: 11, column: 10, scope: !15)
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!37 = !DILocation(line: 11, column: 3, scope: !15)
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