intrinsic-union.ll
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; RUN: opt -O2 %s | llvm-dis > %t1
; RUN: llc -filetype=asm -o - %t1 | FileCheck %s
; RUN: llc -mattr=+alu32 -filetype=asm -o - %t1 | FileCheck %s
;
; Source code:
; union u { int a; int b; };
; #define _(x) (__builtin_preserve_access_index(x))
; int get_value(const void *addr);
; int test(union u *arg) { return get_value(_(&arg->b)); }
; Compiler flag to generate IR:
; clang -target bpf -S -O2 -g -emit-llvm -Xclang -disable-llvm-passes test.c
target triple = "bpf"
%union.u = type { i32 }
; Function Attrs: nounwind
define dso_local i32 @test(%union.u* %arg) local_unnamed_addr #0 !dbg !7 {
entry:
call void @llvm.dbg.value(metadata %union.u* %arg, metadata !17, metadata !DIExpression()), !dbg !18
%0 = tail call %union.u* @llvm.preserve.union.access.index.p0s_union.us.p0s_union.us(%union.u* %arg, i32 1), !dbg !19, !llvm.preserve.access.index !12
%1 = bitcast %union.u* %0 to i8*, !dbg !19
%call = tail call i32 @get_value(i8* %1) #4, !dbg !20
ret i32 %call, !dbg !21
}
; CHECK-LABEL: test
; CHECK: [[RELOC:.Ltmp[0-9]+]]
; CHECK: r2 = 0
; CHECK: r1 += r2
; CHECK: call get_value
; CHECK: exit
; CHECK: .section .BTF.ext,"",@progbits
; CHECK: .long 16 # FieldReloc
; CHECK-NEXT: .long 20 # Field reloc section string offset=20
; CHECK-NEXT: .long 1
; CHECK-NEXT: .long [[RELOC]]
; CHECK-NEXT: .long 2
; CHECK-NEXT: .long 26
; CHECK-NEXT: .long 0
declare dso_local i32 @get_value(i8*) local_unnamed_addr #1
; Function Attrs: nounwind readnone
declare %union.u* @llvm.preserve.union.access.index.p0s_union.us.p0s_union.us(%union.u*, i32 immarg) #2
; Function Attrs: nounwind readnone speculatable
declare void @llvm.dbg.value(metadata, metadata, metadata) #3
attributes #0 = { nounwind "correctly-rounded-divide-sqrt-fp-math"="false" "disable-tail-calls"="false" "less-precise-fpmad"="false" "min-legal-vector-width"="0" "frame-pointer"="all" "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 = { "correctly-rounded-divide-sqrt-fp-math"="false" "disable-tail-calls"="false" "less-precise-fpmad"="false" "frame-pointer"="all" "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" }
attributes #2 = { nounwind readnone }
attributes #3 = { nounwind readnone speculatable }
attributes #4 = { nounwind }
!llvm.dbg.cu = !{!0}
!llvm.module.flags = !{!3, !4, !5}
!llvm.ident = !{!6}
!0 = distinct !DICompileUnit(language: DW_LANG_C99, file: !1, producer: "clang version 9.0.0 (trunk 365789)", isOptimized: true, runtimeVersion: 0, emissionKind: FullDebug, enums: !2, nameTableKind: None)
!1 = !DIFile(filename: "test.c", directory: "/tmp/home/yhs/work/tests/core")
!2 = !{}
!3 = !{i32 2, !"Dwarf Version", i32 4}
!4 = !{i32 2, !"Debug Info Version", i32 3}
!5 = !{i32 1, !"wchar_size", i32 4}
!6 = !{!"clang version 9.0.0 (trunk 365789)"}
!7 = distinct !DISubprogram(name: "test", scope: !1, file: !1, line: 4, type: !8, scopeLine: 4, flags: DIFlagPrototyped, spFlags: DISPFlagDefinition | DISPFlagOptimized, unit: !0, retainedNodes: !16)
!8 = !DISubroutineType(types: !9)
!9 = !{!10, !11}
!10 = !DIBasicType(name: "int", size: 32, encoding: DW_ATE_signed)
!11 = !DIDerivedType(tag: DW_TAG_pointer_type, baseType: !12, size: 64)
!12 = distinct !DICompositeType(tag: DW_TAG_union_type, name: "u", file: !1, line: 1, size: 32, elements: !13)
!13 = !{!14, !15}
!14 = !DIDerivedType(tag: DW_TAG_member, name: "a", scope: !12, file: !1, line: 1, baseType: !10, size: 32)
!15 = !DIDerivedType(tag: DW_TAG_member, name: "b", scope: !12, file: !1, line: 1, baseType: !10, size: 32)
!16 = !{!17}
!17 = !DILocalVariable(name: "arg", arg: 1, scope: !7, file: !1, line: 4, type: !11)
!18 = !DILocation(line: 0, scope: !7)
!19 = !DILocation(line: 4, column: 43, scope: !7)
!20 = !DILocation(line: 4, column: 33, scope: !7)
!21 = !DILocation(line: 4, column: 26, scope: !7)