201 lines
10 KiB
LLVM
201 lines
10 KiB
LLVM
; RUN: opt -O2 %s | llvm-dis > %t1
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; RUN: llc -filetype=asm -o - %t1 | FileCheck -check-prefixes=CHECK,CHECK64 %s
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; RUN: llc -mattr=+alu32 -filetype=asm -o - %t1 | FileCheck -check-prefixes=CHECK,CHECK32 %s
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; Source code:
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; struct s {
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; int a;
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; int b1:9;
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; int b2:4;
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; };
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; enum {
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; FIELD_BYTE_OFFSET = 0,
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; FIELD_BYTE_SIZE,
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; FIELD_EXISTENCE,
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; FIELD_SIGNEDNESS,
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; FIELD_LSHIFT_U64,
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; FIELD_RSHIFT_U64,
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; };
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; void bpf_probe_read(void *, unsigned, const void *);
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; int field_read(struct s *arg) {
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; unsigned long long ull;
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; unsigned offset = __builtin_preserve_field_info(arg->b2, FIELD_BYTE_OFFSET);
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; unsigned size = __builtin_preserve_field_info(arg->b2, FIELD_BYTE_SIZE);
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; unsigned lshift;
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;
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; bpf_probe_read(&ull, size, (const void *)arg + offset);
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; lshift = __builtin_preserve_field_info(arg->b2, FIELD_LSHIFT_U64);
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; #if __BYTE_ORDER__ == __ORDER_BIG_ENDIAN__
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; lshift = lshift + (size << 3) - 64;
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; #endif
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; ull <<= lshift;
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; if (__builtin_preserve_field_info(arg->b2, FIELD_SIGNEDNESS))
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; return (long long)ull >> __builtin_preserve_field_info(arg->b2, FIELD_RSHIFT_U64);
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; return ull >> __builtin_preserve_field_info(arg->b2, FIELD_RSHIFT_U64);
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; }
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; Compilation flag:
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; clang -target bpfel -O2 -g -S -emit-llvm -Xclang -disable-llvm-passes test.c
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target triple = "bpfel"
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%struct.s = type { i32, i16 }
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; Function Attrs: nounwind
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define dso_local i32 @field_read(%struct.s* %arg) local_unnamed_addr #0 !dbg !20 {
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entry:
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%ull = alloca i64, align 8
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call void @llvm.dbg.value(metadata %struct.s* %arg, metadata !31, metadata !DIExpression()), !dbg !37
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%0 = bitcast i64* %ull to i8*, !dbg !38
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call void @llvm.lifetime.start.p0i8(i64 8, i8* nonnull %0) #5, !dbg !38
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%1 = tail call i16* @llvm.preserve.struct.access.index.p0i16.p0s_struct.ss(%struct.s* %arg, i32 1, i32 2), !dbg !39, !llvm.preserve.access.index !25
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%2 = tail call i32 @llvm.bpf.preserve.field.info.p0i16(i16* %1, i64 0), !dbg !40
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call void @llvm.dbg.value(metadata i32 %2, metadata !34, metadata !DIExpression()), !dbg !37
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%3 = tail call i32 @llvm.bpf.preserve.field.info.p0i16(i16* %1, i64 1), !dbg !41
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call void @llvm.dbg.value(metadata i32 %3, metadata !35, metadata !DIExpression()), !dbg !37
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%4 = bitcast %struct.s* %arg to i8*, !dbg !42
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%idx.ext = zext i32 %2 to i64, !dbg !43
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%add.ptr = getelementptr i8, i8* %4, i64 %idx.ext, !dbg !43
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call void @bpf_probe_read(i8* nonnull %0, i32 %3, i8* %add.ptr) #5, !dbg !44
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%5 = call i32 @llvm.bpf.preserve.field.info.p0i16(i16* %1, i64 4), !dbg !45
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call void @llvm.dbg.value(metadata i32 %5, metadata !36, metadata !DIExpression()), !dbg !37
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%6 = load i64, i64* %ull, align 8, !dbg !46, !tbaa !47
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call void @llvm.dbg.value(metadata i64 %6, metadata !32, metadata !DIExpression()), !dbg !37
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%sh_prom = zext i32 %5 to i64, !dbg !46
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%shl = shl i64 %6, %sh_prom, !dbg !46
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call void @llvm.dbg.value(metadata i64 %shl, metadata !32, metadata !DIExpression()), !dbg !37
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%7 = call i32 @llvm.bpf.preserve.field.info.p0i16(i16* %1, i64 3), !dbg !51
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%tobool = icmp eq i32 %7, 0, !dbg !51
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%8 = call i32 @llvm.bpf.preserve.field.info.p0i16(i16* %1, i64 5), !dbg !37
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%sh_prom1 = zext i32 %8 to i64, !dbg !37
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%shr = ashr i64 %shl, %sh_prom1, !dbg !53
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%shr3 = lshr i64 %shl, %sh_prom1, !dbg !53
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%retval.0.in = select i1 %tobool, i64 %shr3, i64 %shr, !dbg !53
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%retval.0 = trunc i64 %retval.0.in to i32, !dbg !37
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call void @llvm.lifetime.end.p0i8(i64 8, i8* nonnull %0) #5, !dbg !54
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ret i32 %retval.0, !dbg !54
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}
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; CHECK: r{{[0-9]+}} = 4
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; CHECK: r{{[0-9]+}} = 4
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; CHECK: r{{[0-9]+}} <<= 51
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; CHECK64: r{{[0-9]+}} s>>= 60
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; CHECK64: r{{[0-9]+}} >>= 60
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; CHECK32: r{{[0-9]+}} >>= 60
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; CHECK32: r{{[0-9]+}} s>>= 60
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; CHECK: r{{[0-9]+}} = 1
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; CHECK: .byte 115 # string offset=1
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; CHECK: .ascii ".text" # string offset=30
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; CHECK: .ascii "0:2" # string offset=73
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; CHECK: .long 16 # FieldReloc
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; CHECK-NEXT: .long 30 # Field reloc section string offset=30
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; CHECK-NEXT: .long 6
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; CHECK-NEXT: .long .Ltmp{{[0-9]+}}
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; CHECK-NEXT: .long 2
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; CHECK-NEXT: .long 73
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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 2
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; CHECK-NEXT: .long 73
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; CHECK-NEXT: .long 1
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; CHECK-NEXT: .long .Ltmp{{[0-9]+}}
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; CHECK-NEXT: .long 2
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; CHECK-NEXT: .long 73
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; CHECK-NEXT: .long 4
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; CHECK-NEXT: .long .Ltmp{{[0-9]+}}
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; CHECK-NEXT: .long 2
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; CHECK-NEXT: .long 73
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; CHECK-NEXT: .long 5
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; CHECK-NEXT: .long .Ltmp{{[0-9]+}}
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; CHECK-NEXT: .long 2
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; CHECK-NEXT: .long 73
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; CHECK-NEXT: .long 5
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; CHECK-NEXT: .long .Ltmp{{[0-9]+}}
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; CHECK-NEXT: .long 2
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; CHECK-NEXT: .long 73
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; CHECK-NEXT: .long 3
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; Function Attrs: argmemonly nounwind willreturn
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declare void @llvm.lifetime.start.p0i8(i64, i8* nocapture) #1
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; Function Attrs: nounwind readnone
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declare i16* @llvm.preserve.struct.access.index.p0i16.p0s_struct.ss(%struct.s*, i32, i32) #2
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; Function Attrs: nounwind readnone
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declare i32 @llvm.bpf.preserve.field.info.p0i16(i16*, i64) #2
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declare dso_local void @bpf_probe_read(i8*, i32, i8*) local_unnamed_addr #3
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; Function Attrs: argmemonly nounwind willreturn
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declare void @llvm.lifetime.end.p0i8(i64, i8* nocapture) #1
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; Function Attrs: nounwind readnone speculatable willreturn
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declare void @llvm.dbg.value(metadata, metadata, metadata) #4
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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 = { argmemonly nounwind willreturn }
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attributes #2 = { nounwind readnone }
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attributes #3 = { "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 #4 = { nounwind readnone speculatable willreturn }
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attributes #5 = { nounwind }
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!llvm.dbg.cu = !{!0}
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!llvm.module.flags = !{!16, !17, !18}
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!llvm.ident = !{!19}
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!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)
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!1 = !DIFile(filename: "test.c", directory: "/tmp/home/yhs/work/tests/core")
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!2 = !{!3}
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!3 = !DICompositeType(tag: DW_TAG_enumeration_type, file: !1, line: 6, baseType: !4, size: 32, elements: !5)
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!4 = !DIBasicType(name: "unsigned int", size: 32, encoding: DW_ATE_unsigned)
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!5 = !{!6, !7, !8, !9, !10, !11}
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!6 = !DIEnumerator(name: "FIELD_BYTE_OFFSET", value: 0, isUnsigned: true)
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!7 = !DIEnumerator(name: "FIELD_BYTE_SIZE", value: 1, isUnsigned: true)
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!8 = !DIEnumerator(name: "FIELD_EXISTENCE", value: 2, isUnsigned: true)
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!9 = !DIEnumerator(name: "FIELD_SIGNEDNESS", value: 3, isUnsigned: true)
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!10 = !DIEnumerator(name: "FIELD_LSHIFT_U64", value: 4, isUnsigned: true)
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!11 = !DIEnumerator(name: "FIELD_RSHIFT_U64", value: 5, isUnsigned: true)
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!12 = !{!13, !15}
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!13 = !DIDerivedType(tag: DW_TAG_pointer_type, baseType: !14, size: 64)
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!14 = !DIDerivedType(tag: DW_TAG_const_type, baseType: null)
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!15 = !DIBasicType(name: "long long int", size: 64, encoding: DW_ATE_signed)
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!16 = !{i32 2, !"Dwarf Version", i32 4}
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!17 = !{i32 2, !"Debug Info Version", i32 3}
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!18 = !{i32 1, !"wchar_size", i32 4}
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!19 = !{!"clang version 10.0.0 (https://github.com/llvm/llvm-project.git 923aa0ce806f7739b754167239fee2c9a15e2f31)"}
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!20 = distinct !DISubprogram(name: "field_read", scope: !1, file: !1, line: 15, type: !21, scopeLine: 15, flags: DIFlagPrototyped, isDefinition: true, isOptimized: true, unit: !0, retainedNodes: !30)
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!21 = !DISubroutineType(types: !22)
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!22 = !{!23, !24}
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!23 = !DIBasicType(name: "int", size: 32, encoding: DW_ATE_signed)
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!24 = !DIDerivedType(tag: DW_TAG_pointer_type, baseType: !25, size: 64)
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!25 = distinct !DICompositeType(tag: DW_TAG_structure_type, name: "s", file: !1, line: 1, size: 64, elements: !26)
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!26 = !{!27, !28, !29}
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!27 = !DIDerivedType(tag: DW_TAG_member, name: "a", scope: !25, file: !1, line: 2, baseType: !23, size: 32)
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!28 = !DIDerivedType(tag: DW_TAG_member, name: "b1", scope: !25, file: !1, line: 3, baseType: !23, size: 9, offset: 32, flags: DIFlagBitField, extraData: i64 32)
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!29 = !DIDerivedType(tag: DW_TAG_member, name: "b2", scope: !25, file: !1, line: 4, baseType: !23, size: 4, offset: 41, flags: DIFlagBitField, extraData: i64 32)
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!30 = !{!31, !32, !34, !35, !36}
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!31 = !DILocalVariable(name: "arg", arg: 1, scope: !20, file: !1, line: 15, type: !24)
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!32 = !DILocalVariable(name: "ull", scope: !20, file: !1, line: 16, type: !33)
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!33 = !DIBasicType(name: "long long unsigned int", size: 64, encoding: DW_ATE_unsigned)
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!34 = !DILocalVariable(name: "offset", scope: !20, file: !1, line: 17, type: !4)
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!35 = !DILocalVariable(name: "size", scope: !20, file: !1, line: 18, type: !4)
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!36 = !DILocalVariable(name: "lshift", scope: !20, file: !1, line: 19, type: !4)
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!37 = !DILocation(line: 0, scope: !20)
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!38 = !DILocation(line: 16, column: 3, scope: !20)
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!39 = !DILocation(line: 17, column: 56, scope: !20)
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!40 = !DILocation(line: 17, column: 21, scope: !20)
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!41 = !DILocation(line: 18, column: 19, scope: !20)
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!42 = !DILocation(line: 21, column: 30, scope: !20)
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!43 = !DILocation(line: 21, column: 48, scope: !20)
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!44 = !DILocation(line: 21, column: 3, scope: !20)
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!45 = !DILocation(line: 22, column: 12, scope: !20)
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!46 = !DILocation(line: 26, column: 7, scope: !20)
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!47 = !{!48, !48, i64 0}
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!48 = !{!"long long", !49, i64 0}
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!49 = !{!"omnipotent char", !50, i64 0}
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!50 = !{!"Simple C/C++ TBAA"}
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!51 = !DILocation(line: 27, column: 7, scope: !52)
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!52 = distinct !DILexicalBlock(scope: !20, file: !1, line: 27, column: 7)
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!53 = !DILocation(line: 27, column: 7, scope: !20)
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!54 = !DILocation(line: 30, column: 1, scope: !20)
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