; RUN: opt -O2 %s | llvm-dis > %t1 ; RUN: llc -filetype=asm -o - %t1 | FileCheck -check-prefixes=CHECK,CHECK-EL,CHECK64 %s ; RUN: llc -mattr=+alu32 -filetype=asm -o - %t1 | FileCheck -check-prefixes=CHECK,CHECK-EL,CHECK32 %s ; Source code: ; struct s { ; int a; ; int b1:9; ; int b2:4; ; }; ; enum { ; FIELD_BYTE_OFFSET = 0, ; FIELD_BYTE_SIZE, ; FIELD_EXISTENCE, ; FIELD_SIGNEDNESS, ; FIELD_LSHIFT_U64, ; FIELD_RSHIFT_U64, ; }; ; int field_read(struct s *arg) { ; unsigned long long ull; ; unsigned offset = __builtin_preserve_field_info(arg->b2, FIELD_BYTE_OFFSET); ; unsigned size = __builtin_preserve_field_info(arg->b2, FIELD_BYTE_SIZE); ; switch(size) { ; case 1: ; ull = *(unsigned char *)((void *)arg + offset); break; ; case 2: ; ull = *(unsigned short *)((void *)arg + offset); break; ; case 4: ; ull = *(unsigned int *)((void *)arg + offset); break; ; case 8: ; ull = *(unsigned long long *)((void *)arg + offset); break; ; } ; ull <<= __builtin_preserve_field_info(arg->b2, FIELD_LSHIFT_U64); ; if (__builtin_preserve_field_info(arg->b2, FIELD_SIGNEDNESS)) ; return ((long long)ull) >>__builtin_preserve_field_info(arg->b2, FIELD_RSHIFT_U64); ; return ull >> __builtin_preserve_field_info(arg->b2, FIELD_RSHIFT_U64); ; } ; Compilation flag: ; clang -target bpfel -O2 -g -S -emit-llvm -Xclang -disable-llvm-passes test.c target triple = "bpfel" %struct.s = type { i32, i16 } ; Function Attrs: nounwind readonly define dso_local i32 @field_read(%struct.s* %arg) local_unnamed_addr #0 !dbg !26 { entry: call void @llvm.dbg.value(metadata %struct.s* %arg, metadata !37, metadata !DIExpression()), !dbg !41 %0 = tail call i16* @llvm.preserve.struct.access.index.p0i16.p0s_struct.ss(%struct.s* %arg, i32 1, i32 2), !dbg !42, !llvm.preserve.access.index !31 %1 = tail call i32 @llvm.bpf.preserve.field.info.p0i16(i16* %0, i64 0), !dbg !43 call void @llvm.dbg.value(metadata i32 %1, metadata !39, metadata !DIExpression()), !dbg !41 %2 = tail call i32 @llvm.bpf.preserve.field.info.p0i16(i16* %0, i64 1), !dbg !44 call void @llvm.dbg.value(metadata i32 %2, metadata !40, metadata !DIExpression()), !dbg !41 switch i32 %2, label %sw.epilog [ i32 1, label %sw.bb i32 2, label %sw.bb1 i32 4, label %sw.bb5 i32 8, label %sw.bb9 ], !dbg !45 sw.bb: ; preds = %entry %3 = bitcast %struct.s* %arg to i8*, !dbg !46 %idx.ext = zext i32 %1 to i64, !dbg !48 %add.ptr = getelementptr i8, i8* %3, i64 %idx.ext, !dbg !48 %4 = load i8, i8* %add.ptr, align 1, !dbg !49, !tbaa !50 %conv = zext i8 %4 to i64, !dbg !49 call void @llvm.dbg.value(metadata i64 %conv, metadata !38, metadata !DIExpression()), !dbg !41 br label %sw.epilog, !dbg !53 sw.bb1: ; preds = %entry %5 = bitcast %struct.s* %arg to i8*, !dbg !54 %idx.ext2 = zext i32 %1 to i64, !dbg !55 %add.ptr3 = getelementptr i8, i8* %5, i64 %idx.ext2, !dbg !55 %6 = bitcast i8* %add.ptr3 to i16*, !dbg !56 %7 = load i16, i16* %6, align 2, !dbg !57, !tbaa !58 %conv4 = zext i16 %7 to i64, !dbg !57 call void @llvm.dbg.value(metadata i64 %conv4, metadata !38, metadata !DIExpression()), !dbg !41 br label %sw.epilog, !dbg !60 sw.bb5: ; preds = %entry %8 = bitcast %struct.s* %arg to i8*, !dbg !61 %idx.ext6 = zext i32 %1 to i64, !dbg !62 %add.ptr7 = getelementptr i8, i8* %8, i64 %idx.ext6, !dbg !62 %9 = bitcast i8* %add.ptr7 to i32*, !dbg !63 %10 = load i32, i32* %9, align 4, !dbg !64, !tbaa !65 %conv8 = zext i32 %10 to i64, !dbg !64 call void @llvm.dbg.value(metadata i64 %conv8, metadata !38, metadata !DIExpression()), !dbg !41 br label %sw.epilog, !dbg !67 sw.bb9: ; preds = %entry %11 = bitcast %struct.s* %arg to i8*, !dbg !68 %idx.ext10 = zext i32 %1 to i64, !dbg !69 %add.ptr11 = getelementptr i8, i8* %11, i64 %idx.ext10, !dbg !69 %12 = bitcast i8* %add.ptr11 to i64*, !dbg !70 %13 = load i64, i64* %12, align 8, !dbg !71, !tbaa !72 call void @llvm.dbg.value(metadata i64 %13, metadata !38, metadata !DIExpression()), !dbg !41 br label %sw.epilog, !dbg !74 sw.epilog: ; preds = %entry, %sw.bb9, %sw.bb5, %sw.bb1, %sw.bb %ull.0 = phi i64 [ undef, %entry ], [ %13, %sw.bb9 ], [ %conv8, %sw.bb5 ], [ %conv4, %sw.bb1 ], [ %conv, %sw.bb ] call void @llvm.dbg.value(metadata i64 %ull.0, metadata !38, metadata !DIExpression()), !dbg !41 %14 = tail call i32 @llvm.bpf.preserve.field.info.p0i16(i16* %0, i64 4), !dbg !75 %sh_prom = zext i32 %14 to i64, !dbg !76 %shl = shl i64 %ull.0, %sh_prom, !dbg !76 call void @llvm.dbg.value(metadata i64 %shl, metadata !38, metadata !DIExpression()), !dbg !41 %15 = tail call i32 @llvm.bpf.preserve.field.info.p0i16(i16* %0, i64 3), !dbg !77 %tobool = icmp eq i32 %15, 0, !dbg !77 %16 = tail call i32 @llvm.bpf.preserve.field.info.p0i16(i16* %0, i64 5), !dbg !41 %sh_prom12 = zext i32 %16 to i64, !dbg !41 %shr = ashr i64 %shl, %sh_prom12, !dbg !79 %shr15 = lshr i64 %shl, %sh_prom12, !dbg !79 %retval.0.in = select i1 %tobool, i64 %shr15, i64 %shr, !dbg !79 %retval.0 = trunc i64 %retval.0.in to i32, !dbg !41 ret i32 %retval.0, !dbg !80 } ; CHECK: r{{[0-9]+}} = 4 ; CHECK: r{{[0-9]+}} = 4 ; CHECK-EL: r{{[0-9]+}} <<= 51 ; CHECK64: r{{[0-9]+}} s>>= 60 ; CHECK64: r{{[0-9]+}} >>= 60 ; CHECK32: r{{[0-9]+}} >>= 60 ; CHECK32: r{{[0-9]+}} s>>= 60 ; CHECK: r{{[0-9]+}} = 1 ; CHECK: .long 1 # BTF_KIND_STRUCT(id = 2) ; CHECK: .byte 115 # string offset=1 ; CHECK: .ascii ".text" # string offset=30 ; CHECK: .ascii "0:2" # string offset=36 ; CHECK: .long 16 # FieldReloc ; CHECK-NEXT: .long 30 # Field reloc section string offset=30 ; CHECK-NEXT: .long 8 ; CHECK-NEXT: .long .Ltmp{{[0-9]+}} ; CHECK-NEXT: .long 2 ; CHECK-NEXT: .long 36 ; CHECK-NEXT: .long 1 ; CHECK-NEXT: .long .Ltmp{{[0-9]+}} ; CHECK-NEXT: .long 2 ; CHECK-NEXT: .long 36 ; CHECK-NEXT: .long 0 ; CHECK-NEXT: .long .Ltmp{{[0-9]+}} ; CHECK-NEXT: .long 2 ; CHECK-NEXT: .long 36 ; CHECK-NEXT: .long 0 ; CHECK-NEXT: .long .Ltmp{{[0-9]+}} ; CHECK-NEXT: .long 2 ; CHECK-NEXT: .long 36 ; CHECK-NEXT: .long 0 ; CHECK-NEXT: .long .Ltmp{{[0-9]+}} ; CHECK-NEXT: .long 2 ; CHECK-NEXT: .long 36 ; CHECK-NEXT: .long 4 ; CHECK-NEXT: .long .Ltmp{{[0-9]+}} ; CHECK-NEXT: .long 2 ; CHECK-NEXT: .long 36 ; CHECK-NEXT: .long 5 ; CHECK-NEXT: .long .Ltmp{{[0-9]+}} ; CHECK-NEXT: .long 2 ; CHECK-NEXT: .long 36 ; CHECK-NEXT: .long 5 ; CHECK-NEXT: .long .Ltmp{{[0-9]+}} ; CHECK-NEXT: .long 2 ; CHECK-NEXT: .long 36 ; CHECK-NEXT: .long 3 ; Function Attrs: nounwind readnone declare i16* @llvm.preserve.struct.access.index.p0i16.p0s_struct.ss(%struct.s*, i32, i32) #1 ; Function Attrs: nounwind readnone declare i32 @llvm.bpf.preserve.field.info.p0i16(i16*, i64) #1 ; Function Attrs: nounwind readnone speculatable willreturn declare void @llvm.dbg.value(metadata, metadata, metadata) #2 attributes #0 = { nounwind readonly "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" } attributes #1 = { nounwind readnone } attributes #2 = { nounwind readnone speculatable willreturn } !llvm.dbg.cu = !{!0} !llvm.module.flags = !{!22, !23, !24} !llvm.ident = !{!25} !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) !1 = !DIFile(filename: "test.c", directory: "/tmp/home/yhs/work/tests/core") !2 = !{!3} !3 = !DICompositeType(tag: DW_TAG_enumeration_type, file: !1, line: 6, baseType: !4, size: 32, elements: !5) !4 = !DIBasicType(name: "unsigned int", size: 32, encoding: DW_ATE_unsigned) !5 = !{!6, !7, !8, !9, !10, !11} !6 = !DIEnumerator(name: "FIELD_BYTE_OFFSET", value: 0, isUnsigned: true) !7 = !DIEnumerator(name: "FIELD_BYTE_SIZE", value: 1, isUnsigned: true) !8 = !DIEnumerator(name: "FIELD_EXISTENCE", value: 2, isUnsigned: true) !9 = !DIEnumerator(name: "FIELD_SIGNEDNESS", value: 3, isUnsigned: true) !10 = !DIEnumerator(name: "FIELD_LSHIFT_U64", value: 4, isUnsigned: true) !11 = !DIEnumerator(name: "FIELD_RSHIFT_U64", value: 5, isUnsigned: true) !12 = !{!13, !15, !16, !18, !19, !21} !13 = !DIDerivedType(tag: DW_TAG_pointer_type, baseType: !14, size: 64) !14 = !DIBasicType(name: "unsigned char", size: 8, encoding: DW_ATE_unsigned_char) !15 = !DIDerivedType(tag: DW_TAG_pointer_type, baseType: null, size: 64) !16 = !DIDerivedType(tag: DW_TAG_pointer_type, baseType: !17, size: 64) !17 = !DIBasicType(name: "unsigned short", size: 16, encoding: DW_ATE_unsigned) !18 = !DIDerivedType(tag: DW_TAG_pointer_type, baseType: !4, size: 64) !19 = !DIDerivedType(tag: DW_TAG_pointer_type, baseType: !20, size: 64) !20 = !DIBasicType(name: "long long unsigned int", size: 64, encoding: DW_ATE_unsigned) !21 = !DIBasicType(name: "long long int", size: 64, encoding: DW_ATE_signed) !22 = !{i32 2, !"Dwarf Version", i32 4} !23 = !{i32 2, !"Debug Info Version", i32 3} !24 = !{i32 1, !"wchar_size", i32 4} !25 = !{!"clang version 10.0.0 (https://github.com/llvm/llvm-project.git 923aa0ce806f7739b754167239fee2c9a15e2f31)"} !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) !27 = !DISubroutineType(types: !28) !28 = !{!29, !30} !29 = !DIBasicType(name: "int", size: 32, encoding: DW_ATE_signed) !30 = !DIDerivedType(tag: DW_TAG_pointer_type, baseType: !31, size: 64) !31 = distinct !DICompositeType(tag: DW_TAG_structure_type, name: "s", file: !1, line: 1, size: 64, elements: !32) !32 = !{!33, !34, !35} !33 = !DIDerivedType(tag: DW_TAG_member, name: "a", scope: !31, file: !1, line: 2, baseType: !29, size: 32) !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) !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) !36 = !{!37, !38, !39, !40} !37 = !DILocalVariable(name: "arg", arg: 1, scope: !26, file: !1, line: 14, type: !30) !38 = !DILocalVariable(name: "ull", scope: !26, file: !1, line: 15, type: !20) !39 = !DILocalVariable(name: "offset", scope: !26, file: !1, line: 16, type: !4) !40 = !DILocalVariable(name: "size", scope: !26, file: !1, line: 17, type: !4) !41 = !DILocation(line: 0, scope: !26) !42 = !DILocation(line: 16, column: 56, scope: !26) !43 = !DILocation(line: 16, column: 21, scope: !26) !44 = !DILocation(line: 17, column: 19, scope: !26) !45 = !DILocation(line: 18, column: 3, scope: !26) !46 = !DILocation(line: 20, column: 30, scope: !47) !47 = distinct !DILexicalBlock(scope: !26, file: !1, line: 18, column: 16) !48 = !DILocation(line: 20, column: 42, scope: !47) !49 = !DILocation(line: 20, column: 11, scope: !47) !50 = !{!51, !51, i64 0} !51 = !{!"omnipotent char", !52, i64 0} !52 = !{!"Simple C/C++ TBAA"} !53 = !DILocation(line: 20, column: 53, scope: !47) !54 = !DILocation(line: 22, column: 31, scope: !47) !55 = !DILocation(line: 22, column: 43, scope: !47) !56 = !DILocation(line: 22, column: 12, scope: !47) !57 = !DILocation(line: 22, column: 11, scope: !47) !58 = !{!59, !59, i64 0} !59 = !{!"short", !51, i64 0} !60 = !DILocation(line: 22, column: 54, scope: !47) !61 = !DILocation(line: 24, column: 29, scope: !47) !62 = !DILocation(line: 24, column: 41, scope: !47) !63 = !DILocation(line: 24, column: 12, scope: !47) !64 = !DILocation(line: 24, column: 11, scope: !47) !65 = !{!66, !66, i64 0} !66 = !{!"int", !51, i64 0} !67 = !DILocation(line: 24, column: 52, scope: !47) !68 = !DILocation(line: 26, column: 35, scope: !47) !69 = !DILocation(line: 26, column: 47, scope: !47) !70 = !DILocation(line: 26, column: 12, scope: !47) !71 = !DILocation(line: 26, column: 11, scope: !47) !72 = !{!73, !73, i64 0} !73 = !{!"long long", !51, i64 0} !74 = !DILocation(line: 26, column: 58, scope: !47) !75 = !DILocation(line: 28, column: 11, scope: !26) !76 = !DILocation(line: 28, column: 7, scope: !26) !77 = !DILocation(line: 29, column: 7, scope: !78) !78 = distinct !DILexicalBlock(scope: !26, file: !1, line: 29, column: 7) !79 = !DILocation(line: 29, column: 7, scope: !26) !80 = !DILocation(line: 32, column: 1, scope: !26)