; RUN: opt -O2 %s | llvm-dis > %t1 ; RUN: llc -filetype=asm -o - %t1 | FileCheck -check-prefixes=CHECK,CHECK-EL,CHECK-ALU64 %s ; RUN: llc -mattr=+alu32 -filetype=asm -o - %t1 | FileCheck -check-prefixes=CHECK,CHECK-EL,CHECK-ALU32 %s ; Source code: ; struct s { ; char f1; ; char bf1:6, ; bf2:2, ; bf3:5, ; bf4:3; ; }; ; enum {FIELD_TYPE_OFFSET = 0, FIELD_TYPE_SIZE = 1, FIELD_TYPE_LSHIFT_U64 = 4,}; ; int test(struct s *arg) { ; return __builtin_preserve_field_info(arg->bf4, FIELD_TYPE_OFFSET) + ; __builtin_preserve_field_info(arg->bf4, FIELD_TYPE_SIZE) + ; __builtin_preserve_field_info(arg->bf4, FIELD_TYPE_LSHIFT_U64); ; } ; For this case, the IR type has the same starting storage offset for fields ; bf1, bf1, bf3 and bf4 and the ABI alignment is 1 byte. So for bf4 access, ; the starting offset has to be at the beginning of field bf3. ; Compilation flag: ; clang -target bpfel -O2 -g -S -emit-llvm -Xclang -disable-llvm-passes test.c target triple = "bpfel" %struct.s = type <{ i8, i16 }> ; Function Attrs: nounwind readnone define dso_local i32 @test(%struct.s* %arg) local_unnamed_addr #0 !dbg !13 { entry: call void @llvm.dbg.value(metadata %struct.s* %arg, metadata !27, metadata !DIExpression()), !dbg !28 %0 = tail call i16* @llvm.preserve.struct.access.index.p0i16.p0s_struct.ss(%struct.s* %arg, i32 1, i32 4), !dbg !29, !llvm.preserve.access.index !18 %1 = tail call i32 @llvm.bpf.preserve.field.info.p0i16(i16* %0, i64 0), !dbg !30 %2 = tail call i32 @llvm.bpf.preserve.field.info.p0i16(i16* %0, i64 1), !dbg !31 %add = add i32 %2, %1, !dbg !32 %3 = tail call i32 @llvm.bpf.preserve.field.info.p0i16(i16* %0, i64 4), !dbg !33 %add1 = add i32 %add, %3, !dbg !34 ret i32 %add1, !dbg !35 } ; CHECK: r1 = 2 ; CHECK: r0 = 1 ; CHECK-ALU64: r0 += r1 ; CHECK-ALU32: w0 += w1 ; CHECK-EL: r1 = 56 ; CHECK-ALU64: r0 += r1 ; CHECK-ALU32: w0 += w1 ; CHECK: exit ; CHECK: .long 1 # BTF_KIND_STRUCT(id = 2) ; CHECK: .byte 115 # string offset=1 ; CHECK: .ascii ".text" # string offset=40 ; CHECK: .ascii "0:4" # string offset=46 ; CHECK: .long 16 # FieldReloc ; CHECK-NEXT: .long 40 # Field reloc section string offset=40 ; CHECK-NEXT: .long 3 ; CHECK-NEXT: .long .Ltmp{{[0-9]+}} ; CHECK-NEXT: .long 2 ; CHECK-NEXT: .long 46 ; CHECK-NEXT: .long 0 ; CHECK-NEXT: .long .Ltmp{{[0-9]+}} ; CHECK-NEXT: .long 2 ; CHECK-NEXT: .long 46 ; CHECK-NEXT: .long 1 ; CHECK-NEXT: .long .Ltmp{{[0-9]+}} ; CHECK-NEXT: .long 2 ; CHECK-NEXT: .long 46 ; CHECK-NEXT: .long 4 ; 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 declare void @llvm.dbg.value(metadata, metadata, metadata) #2 attributes #0 = { nounwind readnone "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 } !llvm.dbg.cu = !{!0} !llvm.module.flags = !{!9, !10, !11} !llvm.ident = !{!12} !0 = distinct !DICompileUnit(language: DW_LANG_C99, file: !1, producer: "clang version 10.0.0 (https://github.com/llvm/llvm-project.git 630ca91834ecc06349cb3b4bd2982c1b85b5ad96)", isOptimized: true, runtimeVersion: 0, emissionKind: FullDebug, enums: !2, 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: 8, baseType: !4, size: 32, elements: !5) !4 = !DIBasicType(name: "unsigned int", size: 32, encoding: DW_ATE_unsigned) !5 = !{!6, !7, !8} !6 = !DIEnumerator(name: "FIELD_TYPE_OFFSET", value: 0, isUnsigned: true) !7 = !DIEnumerator(name: "FIELD_TYPE_SIZE", value: 1, isUnsigned: true) !8 = !DIEnumerator(name: "FIELD_TYPE_LSHIFT_U64", value: 4, isUnsigned: true) !9 = !{i32 2, !"Dwarf Version", i32 4} !10 = !{i32 2, !"Debug Info Version", i32 3} !11 = !{i32 1, !"wchar_size", i32 4} !12 = !{!"clang version 10.0.0 (https://github.com/llvm/llvm-project.git 630ca91834ecc06349cb3b4bd2982c1b85b5ad96)"} !13 = distinct !DISubprogram(name: "test", scope: !1, file: !1, line: 9, type: !14, scopeLine: 9, flags: DIFlagPrototyped, isDefinition: true, isOptimized: true, unit: !0, retainedNodes: !26) !14 = !DISubroutineType(types: !15) !15 = !{!16, !17} !16 = !DIBasicType(name: "int", size: 32, encoding: DW_ATE_signed) !17 = !DIDerivedType(tag: DW_TAG_pointer_type, baseType: !18, size: 64) !18 = distinct !DICompositeType(tag: DW_TAG_structure_type, name: "s", file: !1, line: 1, size: 24, elements: !19) !19 = !{!20, !22, !23, !24, !25} !20 = !DIDerivedType(tag: DW_TAG_member, name: "f1", scope: !18, file: !1, line: 2, baseType: !21, size: 8) !21 = !DIBasicType(name: "char", size: 8, encoding: DW_ATE_signed_char) !22 = !DIDerivedType(tag: DW_TAG_member, name: "bf1", scope: !18, file: !1, line: 3, baseType: !21, size: 6, offset: 8, flags: DIFlagBitField, extraData: i64 8) !23 = !DIDerivedType(tag: DW_TAG_member, name: "bf2", scope: !18, file: !1, line: 4, baseType: !21, size: 2, offset: 14, flags: DIFlagBitField, extraData: i64 8) !24 = !DIDerivedType(tag: DW_TAG_member, name: "bf3", scope: !18, file: !1, line: 5, baseType: !21, size: 5, offset: 16, flags: DIFlagBitField, extraData: i64 8) !25 = !DIDerivedType(tag: DW_TAG_member, name: "bf4", scope: !18, file: !1, line: 6, baseType: !21, size: 3, offset: 21, flags: DIFlagBitField, extraData: i64 8) !26 = !{!27} !27 = !DILocalVariable(name: "arg", arg: 1, scope: !13, file: !1, line: 9, type: !17) !28 = !DILocation(line: 0, scope: !13) !29 = !DILocation(line: 10, column: 45, scope: !13) !30 = !DILocation(line: 10, column: 10, scope: !13) !31 = !DILocation(line: 11, column: 10, scope: !13) !32 = !DILocation(line: 10, column: 69, scope: !13) !33 = !DILocation(line: 12, column: 10, scope: !13) !34 = !DILocation(line: 11, column: 67, scope: !13) !35 = !DILocation(line: 10, column: 3, scope: !13)