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1; RUN: opt -O2 %s | llvm-dis > %t12; RUN: llc -mcpu=v1 -filetype=asm -o - %t1 | FileCheck -check-prefixes=CHECK,CHECK-EB,CHECK64 %s3; RUN: llc -mcpu=v1 -mattr=+alu32 -filetype=asm -o - %t1 | FileCheck -check-prefixes=CHECK,CHECK-EB,CHECK32 %s4; Source code:5; struct s {6; int a;7; int b1:9;8; int b2:4;9; };10; enum {11; FIELD_BYTE_OFFSET = 0,12; FIELD_BYTE_SIZE,13; FIELD_EXISTENCE,14; FIELD_SIGNEDNESS,15; FIELD_LSHIFT_U64,16; FIELD_RSHIFT_U64,17; };18; int field_read(struct s *arg) {19; unsigned long long ull;20; unsigned offset = __builtin_preserve_field_info(arg->b2, FIELD_BYTE_OFFSET);21; unsigned size = __builtin_preserve_field_info(arg->b2, FIELD_BYTE_SIZE);22; switch(size) {23; case 1:24; ull = *(unsigned char *)((ptr)arg + offset); break;25; case 2:26; ull = *(unsigned short *)((ptr)arg + offset); break;27; case 4:28; ull = *(unsigned int *)((ptr)arg + offset); break;29; case 8:30; ull = *(unsigned long long *)((ptr)arg + offset); break;31; }32; ull <<= __builtin_preserve_field_info(arg->b2, FIELD_LSHIFT_U64);33; if (__builtin_preserve_field_info(arg->b2, FIELD_SIGNEDNESS))34; return ((long long)ull) >>__builtin_preserve_field_info(arg->b2, FIELD_RSHIFT_U64);35; return ull >> __builtin_preserve_field_info(arg->b2, FIELD_RSHIFT_U64);36; }37; Compilation flag:38; clang -target bpfeb -O2 -g -S -emit-llvm -Xclang -disable-llvm-passes test.c39 40target triple = "bpfeb"41 42%struct.s = type { i32, i16 }43 44; Function Attrs: nounwind readonly45define dso_local i32 @field_read(ptr %arg) local_unnamed_addr !dbg !26 {46entry:47 call void @llvm.dbg.value(metadata ptr %arg, metadata !37, metadata !DIExpression()), !dbg !4148 %0 = tail call ptr @llvm.preserve.struct.access.index.p0.p0.ss(ptr elementtype(%struct.s) %arg, i32 1, i32 2), !dbg !42, !llvm.preserve.access.index !3149 %1 = tail call i32 @llvm.bpf.preserve.field.info.p0(ptr %0, i64 0), !dbg !4350 call void @llvm.dbg.value(metadata i32 %1, metadata !39, metadata !DIExpression()), !dbg !4151 %2 = tail call i32 @llvm.bpf.preserve.field.info.p0(ptr %0, i64 1), !dbg !4452 call void @llvm.dbg.value(metadata i32 %2, metadata !40, metadata !DIExpression()), !dbg !4153 switch i32 %2, label %sw.epilog [54 i32 1, label %sw.bb55 i32 2, label %sw.bb156 i32 4, label %sw.bb557 i32 8, label %sw.bb958 ], !dbg !4559 60sw.bb: ; preds = %entry61 %idx.ext = zext i32 %1 to i64, !dbg !4862 %add.ptr = getelementptr i8, ptr %arg, i64 %idx.ext, !dbg !4863 %3 = load i8, ptr %add.ptr, align 1, !dbg !49, !tbaa !5064 %conv = zext i8 %3 to i64, !dbg !4965 call void @llvm.dbg.value(metadata i64 %conv, metadata !38, metadata !DIExpression()), !dbg !4166 br label %sw.epilog, !dbg !5367 68sw.bb1: ; preds = %entry69 %idx.ext2 = zext i32 %1 to i64, !dbg !5570 %add.ptr3 = getelementptr i8, ptr %arg, i64 %idx.ext2, !dbg !5571 %4 = load i16, ptr %add.ptr3, align 2, !dbg !57, !tbaa !5872 %conv4 = zext i16 %4 to i64, !dbg !5773 call void @llvm.dbg.value(metadata i64 %conv4, metadata !38, metadata !DIExpression()), !dbg !4174 br label %sw.epilog, !dbg !6075 76sw.bb5: ; preds = %entry77 %idx.ext6 = zext i32 %1 to i64, !dbg !6278 %add.ptr7 = getelementptr i8, ptr %arg, i64 %idx.ext6, !dbg !6279 %5 = load i32, ptr %add.ptr7, align 4, !dbg !64, !tbaa !6580 %conv8 = zext i32 %5 to i64, !dbg !6481 call void @llvm.dbg.value(metadata i64 %conv8, metadata !38, metadata !DIExpression()), !dbg !4182 br label %sw.epilog, !dbg !6783 84sw.bb9: ; preds = %entry85 %idx.ext10 = zext i32 %1 to i64, !dbg !6986 %add.ptr11 = getelementptr i8, ptr %arg, i64 %idx.ext10, !dbg !6987 %6 = load i64, ptr %add.ptr11, align 8, !dbg !71, !tbaa !7288 call void @llvm.dbg.value(metadata i64 %6, metadata !38, metadata !DIExpression()), !dbg !4189 br label %sw.epilog, !dbg !7490 91sw.epilog: ; preds = %entry, %sw.bb9, %sw.bb5, %sw.bb1, %sw.bb92 %ull.0 = phi i64 [ undef, %entry ], [ %6, %sw.bb9 ], [ %conv8, %sw.bb5 ], [ %conv4, %sw.bb1 ], [ %conv, %sw.bb ]93 call void @llvm.dbg.value(metadata i64 %ull.0, metadata !38, metadata !DIExpression()), !dbg !4194 %7 = tail call i32 @llvm.bpf.preserve.field.info.p0(ptr %0, i64 4), !dbg !7595 %sh_prom = zext i32 %7 to i64, !dbg !7696 %shl = shl i64 %ull.0, %sh_prom, !dbg !7697 call void @llvm.dbg.value(metadata i64 %shl, metadata !38, metadata !DIExpression()), !dbg !4198 %8 = tail call i32 @llvm.bpf.preserve.field.info.p0(ptr %0, i64 3), !dbg !7799 %tobool = icmp eq i32 %8, 0, !dbg !77100 %9 = tail call i32 @llvm.bpf.preserve.field.info.p0(ptr %0, i64 5), !dbg !41101 %sh_prom12 = zext i32 %9 to i64, !dbg !41102 %shr = ashr i64 %shl, %sh_prom12, !dbg !79103 %shr15 = lshr i64 %shl, %sh_prom12, !dbg !79104 %retval.0.in = select i1 %tobool, i64 %shr15, i64 %shr, !dbg !79105 %retval.0 = trunc i64 %retval.0.in to i32, !dbg !41106 ret i32 %retval.0, !dbg !80107}108 109; CHECK: r{{[0-9]+}} = 4110; CHECK: r{{[0-9]+}} = 4111; CHECK-EB: r{{[0-9]+}} <<= 41112; CHECK64: r{{[0-9]+}} s>>= 60113; CHECK64: r{{[0-9]+}} >>= 60114; CHECK32: r{{[0-9]+}} >>= 60115; CHECK32: r{{[0-9]+}} s>>= 60116; CHECK: r{{[0-9]+}} = 1117 118; CHECK: .long 1 # BTF_KIND_STRUCT(id = 2)119; CHECK: .byte 115 # string offset=1120; CHECK: .ascii ".text" # string offset=30121; CHECK: .ascii "0:2" # string offset=36122 123; CHECK: .long 16 # FieldReloc124; CHECK-NEXT: .long 30 # Field reloc section string offset=30125; CHECK-NEXT: .long 8126; CHECK-NEXT: .long .Ltmp{{[0-9]+}}127; CHECK-NEXT: .long 2128; CHECK-NEXT: .long 36129; CHECK-NEXT: .long 1130; CHECK-NEXT: .long .Ltmp{{[0-9]+}}131; CHECK-NEXT: .long 2132; CHECK-NEXT: .long 36133; CHECK-NEXT: .long 0134; CHECK-NEXT: .long .Ltmp{{[0-9]+}}135; CHECK-NEXT: .long 2136; CHECK-NEXT: .long 36137; CHECK-NEXT: .long 0138; CHECK-NEXT: .long .Ltmp{{[0-9]+}}139; CHECK-NEXT: .long 2140; CHECK-NEXT: .long 36141; CHECK-NEXT: .long 0142; CHECK-NEXT: .long .Ltmp{{[0-9]+}}143; CHECK-NEXT: .long 2144; CHECK-NEXT: .long 36145; CHECK-NEXT: .long 4146; CHECK-NEXT: .long .Ltmp{{[0-9]+}}147; CHECK-NEXT: .long 2148; CHECK-NEXT: .long 36149; CHECK-NEXT: .long 5150; CHECK-NEXT: .long .Ltmp{{[0-9]+}}151; CHECK-NEXT: .long 2152; CHECK-NEXT: .long 36153; CHECK-NEXT: .long 5154; CHECK-NEXT: .long .Ltmp{{[0-9]+}}155; CHECK-NEXT: .long 2156; CHECK-NEXT: .long 36157; CHECK-NEXT: .long 3158 159; Function Attrs: nounwind readnone160declare ptr @llvm.preserve.struct.access.index.p0.p0.ss(ptr, i32, i32)161 162; Function Attrs: nounwind readnone163declare i32 @llvm.bpf.preserve.field.info.p0(ptr, i64)164 165; Function Attrs: nounwind readnone speculatable willreturn166declare void @llvm.dbg.value(metadata, metadata, metadata)167 168!llvm.dbg.cu = !{!0}169!llvm.module.flags = !{!22, !23, !24}170!llvm.ident = !{!25}171 172!0 = distinct !DICompileUnit(language: DW_LANG_C99, file: !1, producer: "clang version 10.0.0 (https://github.com/llvm/llvm-project.git 923aa0ce806f7739b754167239fee2c9a15e2f31)", isOptimized: true, runtimeVersion: 0, emissionKind: FullDebug, enums: !2, retainedTypes: !12, nameTableKind: None)173!1 = !DIFile(filename: "test.c", directory: "/tmp/home/yhs/work/tests/core")174!2 = !{!3}175!3 = !DICompositeType(tag: DW_TAG_enumeration_type, file: !1, line: 6, baseType: !4, size: 32, elements: !5)176!4 = !DIBasicType(name: "unsigned int", size: 32, encoding: DW_ATE_unsigned)177!5 = !{!6, !7, !8, !9, !10, !11}178!6 = !DIEnumerator(name: "FIELD_BYTE_OFFSET", value: 0, isUnsigned: true)179!7 = !DIEnumerator(name: "FIELD_BYTE_SIZE", value: 1, isUnsigned: true)180!8 = !DIEnumerator(name: "FIELD_EXISTENCE", value: 2, isUnsigned: true)181!9 = !DIEnumerator(name: "FIELD_SIGNEDNESS", value: 3, isUnsigned: true)182!10 = !DIEnumerator(name: "FIELD_LSHIFT_U64", value: 4, isUnsigned: true)183!11 = !DIEnumerator(name: "FIELD_RSHIFT_U64", value: 5, isUnsigned: true)184!12 = !{!13, !15, !16, !18, !19, !21}185!13 = !DIDerivedType(tag: DW_TAG_pointer_type, baseType: !14, size: 64)186!14 = !DIBasicType(name: "unsigned char", size: 8, encoding: DW_ATE_unsigned_char)187!15 = !DIDerivedType(tag: DW_TAG_pointer_type, baseType: null, size: 64)188!16 = !DIDerivedType(tag: DW_TAG_pointer_type, baseType: !17, size: 64)189!17 = !DIBasicType(name: "unsigned short", size: 16, encoding: DW_ATE_unsigned)190!18 = !DIDerivedType(tag: DW_TAG_pointer_type, baseType: !4, size: 64)191!19 = !DIDerivedType(tag: DW_TAG_pointer_type, baseType: !20, size: 64)192!20 = !DIBasicType(name: "long long unsigned int", size: 64, encoding: DW_ATE_unsigned)193!21 = !DIBasicType(name: "long long int", size: 64, encoding: DW_ATE_signed)194!22 = !{i32 2, !"Dwarf Version", i32 4}195!23 = !{i32 2, !"Debug Info Version", i32 3}196!24 = !{i32 1, !"wchar_size", i32 4}197!25 = !{!"clang version 10.0.0 (https://github.com/llvm/llvm-project.git 923aa0ce806f7739b754167239fee2c9a15e2f31)"}198!26 = distinct !DISubprogram(name: "field_read", scope: !1, file: !1, line: 14, type: !27, scopeLine: 14, flags: DIFlagPrototyped, isDefinition: true, isOptimized: true, unit: !0, retainedNodes: !36)199!27 = !DISubroutineType(types: !28)200!28 = !{!29, !30}201!29 = !DIBasicType(name: "int", size: 32, encoding: DW_ATE_signed)202!30 = !DIDerivedType(tag: DW_TAG_pointer_type, baseType: !31, size: 64)203!31 = distinct !DICompositeType(tag: DW_TAG_structure_type, name: "s", file: !1, line: 1, size: 64, elements: !32)204!32 = !{!33, !34, !35}205!33 = !DIDerivedType(tag: DW_TAG_member, name: "a", scope: !31, file: !1, line: 2, baseType: !29, size: 32)206!34 = !DIDerivedType(tag: DW_TAG_member, name: "b1", scope: !31, file: !1, line: 3, baseType: !29, size: 9, offset: 32, flags: DIFlagBitField, extraData: i64 32)207!35 = !DIDerivedType(tag: DW_TAG_member, name: "b2", scope: !31, file: !1, line: 4, baseType: !29, size: 4, offset: 41, flags: DIFlagBitField, extraData: i64 32)208!36 = !{!37, !38, !39, !40}209!37 = !DILocalVariable(name: "arg", arg: 1, scope: !26, file: !1, line: 14, type: !30)210!38 = !DILocalVariable(name: "ull", scope: !26, file: !1, line: 15, type: !20)211!39 = !DILocalVariable(name: "offset", scope: !26, file: !1, line: 16, type: !4)212!40 = !DILocalVariable(name: "size", scope: !26, file: !1, line: 17, type: !4)213!41 = !DILocation(line: 0, scope: !26)214!42 = !DILocation(line: 16, column: 56, scope: !26)215!43 = !DILocation(line: 16, column: 21, scope: !26)216!44 = !DILocation(line: 17, column: 19, scope: !26)217!45 = !DILocation(line: 18, column: 3, scope: !26)218!46 = !DILocation(line: 20, column: 30, scope: !47)219!47 = distinct !DILexicalBlock(scope: !26, file: !1, line: 18, column: 16)220!48 = !DILocation(line: 20, column: 42, scope: !47)221!49 = !DILocation(line: 20, column: 11, scope: !47)222!50 = !{!51, !51, i64 0}223!51 = !{!"omnipotent char", !52, i64 0}224!52 = !{!"Simple C/C++ TBAA"}225!53 = !DILocation(line: 20, column: 53, scope: !47)226!54 = !DILocation(line: 22, column: 31, scope: !47)227!55 = !DILocation(line: 22, column: 43, scope: !47)228!56 = !DILocation(line: 22, column: 12, scope: !47)229!57 = !DILocation(line: 22, column: 11, scope: !47)230!58 = !{!59, !59, i64 0}231!59 = !{!"short", !51, i64 0}232!60 = !DILocation(line: 22, column: 54, scope: !47)233!61 = !DILocation(line: 24, column: 29, scope: !47)234!62 = !DILocation(line: 24, column: 41, scope: !47)235!63 = !DILocation(line: 24, column: 12, scope: !47)236!64 = !DILocation(line: 24, column: 11, scope: !47)237!65 = !{!66, !66, i64 0}238!66 = !{!"int", !51, i64 0}239!67 = !DILocation(line: 24, column: 52, scope: !47)240!68 = !DILocation(line: 26, column: 35, scope: !47)241!69 = !DILocation(line: 26, column: 47, scope: !47)242!70 = !DILocation(line: 26, column: 12, scope: !47)243!71 = !DILocation(line: 26, column: 11, scope: !47)244!72 = !{!73, !73, i64 0}245!73 = !{!"long long", !51, i64 0}246!74 = !DILocation(line: 26, column: 58, scope: !47)247!75 = !DILocation(line: 28, column: 11, scope: !26)248!76 = !DILocation(line: 28, column: 7, scope: !26)249!77 = !DILocation(line: 29, column: 7, scope: !78)250!78 = distinct !DILexicalBlock(scope: !26, file: !1, line: 29, column: 7)251!79 = !DILocation(line: 29, column: 7, scope: !26)252!80 = !DILocation(line: 32, column: 1, scope: !26)253