Semicompiled

typedef struct
{
    int a : 1;
    int b : 2;
} MyStruct;
MyStruct x;
void myEntry(void)
{
    x.b = 3;
}

; ModuleID = '/tmp/semicompiled-GJ0RmbOb-15416914929746330395/source.c'
source_filename = "/tmp/semicompiled-GJ0RmbOb-15416914929746330395/source.c"
target datalayout = "e-m:e-p270:32:32-p271:32:32-p272:64:64-i64:64-f80:128-n8:16:32:64-S128"
target triple = "x86_64-pc-linux-gnu"

%struct.MyStruct = type { i8, [3 x i8] }

@x = dso_local global %struct.MyStruct zeroinitializer, align 4

; Function Attrs: noinline nounwind optnone uwtable
define dso_local void @myEntry() #0 {
  %1 = load i8, i8* getelementptr inbounds (%struct.MyStruct, %struct.MyStruct* @x, i32 0, i32 0), align 4
  %2 = and i8 %1, -7
  %3 = or i8 %2, 6
  store i8 %3, i8* getelementptr inbounds (%struct.MyStruct, %struct.MyStruct* @x, i32 0, i32 0), align 4
  ret void
}

attributes #0 = { noinline nounwind optnone uwtable "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"="true" "stack-protector-buffer-size"="8" "target-cpu"="x86-64" "target-features"="+cx8,+fxsr,+mmx,+sse,+sse2,+x87" "unsafe-fp-math"="false" "use-soft-float"="false" }

!llvm.module.flags = !{!0}
!llvm.ident = !{!1}

!0 = !{i32 1, !"wchar_size", i32 4}
!1 = !{!"Debian clang version 11.0.1-2"}

; ModuleID = '/tmp/semicompiled-GJ0RmbOb-15416914929746330395/source.c'
source_filename = "/tmp/semicompiled-GJ0RmbOb-15416914929746330395/source.c"
target datalayout = "e-m:e-p270:32:32-p271:32:32-p272:64:64-i64:64-f80:128-n8:16:32:64-S128"
target triple = "x86_64-pc-linux-gnu"

%struct.MyStruct = type { i8, [3 x i8] }

@x = dso_local global %struct.MyStruct zeroinitializer, align 4, !dbg !0

; Function Attrs: noinline nounwind optnone uwtable
define dso_local void @myEntry() #0 !dbg !17 {
  %1 = load i8, i8* getelementptr inbounds (%struct.MyStruct, %struct.MyStruct* @x, i32 0, i32 0), align 4, !dbg !20
  %2 = and i8 %1, -7, !dbg !20
  %3 = or i8 %2, 6, !dbg !20
  store i8 %3, i8* getelementptr inbounds (%struct.MyStruct, %struct.MyStruct* @x, i32 0, i32 0), align 4, !dbg !20
  ret void, !dbg !21
}

attributes #0 = { noinline nounwind optnone uwtable "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"="true" "stack-protector-buffer-size"="8" "target-cpu"="x86-64" "target-features"="+cx8,+fxsr,+mmx,+sse,+sse2,+x87" "unsafe-fp-math"="false" "use-soft-float"="false" }

!llvm.dbg.cu = !{!2}
!llvm.module.flags = !{!13, !14, !15}
!llvm.ident = !{!16}

!0 = !DIGlobalVariableExpression(var: !1, expr: !DIExpression())
!1 = distinct !DIGlobalVariable(name: "x", scope: !2, file: !6, line: 6, type: !7, isLocal: false, isDefinition: true)
!2 = distinct !DICompileUnit(language: DW_LANG_C99, file: !3, producer: "Debian clang version 11.0.1-2", isOptimized: false, runtimeVersion: 0, emissionKind: FullDebug, enums: !4, globals: !5, splitDebugInlining: false, nameTableKind: None)
!3 = !DIFile(filename: "/tmp/semicompiled-GJ0RmbOb-15416914929746330395/source.c", directory: "/__w/semicompiled/semicompiled")
!4 = !{}
!5 = !{!0}
!6 = !DIFile(filename: "/tmp/semicompiled-GJ0RmbOb-15416914929746330395/source.c", directory: "")
!7 = !DIDerivedType(tag: DW_TAG_typedef, name: "MyStruct", file: !6, line: 5, baseType: !8)
!8 = distinct !DICompositeType(tag: DW_TAG_structure_type, file: !6, line: 1, size: 32, elements: !9)
!9 = !{!10, !12}
!10 = !DIDerivedType(tag: DW_TAG_member, name: "a", scope: !8, file: !6, line: 3, baseType: !11, size: 1, flags: DIFlagBitField, extraData: i64 0)
!11 = !DIBasicType(name: "int", size: 32, encoding: DW_ATE_signed)
!12 = !DIDerivedType(tag: DW_TAG_member, name: "b", scope: !8, file: !6, line: 4, baseType: !11, size: 2, offset: 1, flags: DIFlagBitField, extraData: i64 0)
!13 = !{i32 7, !"Dwarf Version", i32 4}
!14 = !{i32 2, !"Debug Info Version", i32 3}
!15 = !{i32 1, !"wchar_size", i32 4}
!16 = !{!"Debian clang version 11.0.1-2"}
!17 = distinct !DISubprogram(name: "myEntry", scope: !6, file: !6, line: 7, type: !18, scopeLine: 8, flags: DIFlagPrototyped, spFlags: DISPFlagDefinition, unit: !2, retainedNodes: !4)
!18 = !DISubroutineType(types: !19)
!19 = !{null}
!20 = !DILocation(line: 9, column: 9, scope: !17)
!21 = !DILocation(line: 10, column: 1, scope: !17)

(module
  (type (;0;) (func))
  (import "env" "__stack_pointer" (global (;0;) (mut i32)))
  (import "env" "__memory_base" (global (;1;) i32))
  (import "env" "__table_base" (global (;2;) i32))
  (import "GOT.mem" "x" (global (;3;) (mut i32)))
  (import "env" "memory" (memory (;0;) 0))
  (import "env" "__indirect_function_table" (table (;0;) 0 funcref))
  (func (;0;) (type 0)
    call 1)
  (func (;1;) (type 0))
  (func (;2;) (type 0)
    (local i32 i32 i32 i32)
    global.get 3
    local.set 0
    local.get 0
    i32.load8_u
    local.set 1
    i32.const 6
    local.set 2
    local.get 1
    local.get 2
    i32.or
    local.set 3
    local.get 0
    local.get 3
    i32.store8
    return)
  (global (;4;) i32 (i32.const 0))
  (global (;5;) i32 (i32.const 0))
  (export "__post_instantiate" (func 0))
  (export "__wasm_apply_relocs" (func 1))
  (export "myEntry" (func 2))
  (export "x" (global 4))
  (export "__dso_handle" (global 5))
  (data (;0;) (global.get 1) "\00\00\00\00"))

/tmp/semicompiled-GJ0RmbOb-15416914929746330395/source.o:	file format elf64-bpf


Disassembly of section .text:

0000000000000000 <myEntry>:
; myEntry():
; /tmp/semicompiled-GJ0RmbOb-15416914929746330395/source.c:9
;     x.b = 3;
       0:	r1 = 0 ll
       2:	r2 = *(u8 *)(r1 + 0)
       3:	r2 |= 6
       4:	*(u8 *)(r1 + 0) = r2
; /tmp/semicompiled-GJ0RmbOb-15416914929746330395/source.c:10
; }
       5:	exit