; LLVM IR from MakeContributions/DSA :: algorithms/C/linked-lists (doubly-linked-list)

; Unoptimized IR (clang -disable-llvm-passes):
target datalayout = "e-m:e-p270:32:32-p271:32:32-p272:64:64-i64:64-i128:128-f80:128-n8:16:32:64-S128"
target triple = "x86_64-unknown-linux-gnu"

%struct.dll = type { i32, ptr, ptr }
%struct.node_ = type { i32, ptr, ptr }

; Function Attrs: nounwind uwtable
declare dso_local ptr @createnode(i32 noundef) #0

; Function Attrs: nocallback nofree nosync nounwind willreturn memory(argmem: readwrite)
declare void @llvm.lifetime.start.p0(i64 immarg, ptr nocapture) #1

; Function Attrs: nocallback nofree nosync nounwind willreturn memory(argmem: readwrite)
declare void @llvm.lifetime.end.p0(i64 immarg, ptr nocapture) #1

; Function Attrs: nounwind uwtable
define dso_local void @push_front(ptr noundef %0, i32 noundef %1) #0 {
  %3 = alloca ptr, align 8
  %4 = alloca i32, align 4
  %5 = alloca ptr, align 8
  %6 = alloca ptr, align 8
  %7 = alloca i32, align 4
  store ptr %0, ptr %3, align 8, !tbaa !5
  store i32 %1, ptr %4, align 4, !tbaa !9
  call void @llvm.lifetime.start.p0(i64 8, ptr %5) #2
  %8 = load i32, ptr %4, align 4, !tbaa !9
  %9 = call ptr @createnode(i32 noundef %8)
  store ptr %9, ptr %5, align 8, !tbaa !5
  call void @llvm.lifetime.start.p0(i64 8, ptr %6) #2
  %10 = load ptr, ptr %3, align 8, !tbaa !5
  %11 = getelementptr inbounds %struct.dll, ptr %10, i32 0, i32 1
  %12 = load ptr, ptr %11, align 8, !tbaa !11
  store ptr %12, ptr %6, align 8, !tbaa !5
  %13 = load ptr, ptr %3, align 8, !tbaa !5
  %14 = getelementptr inbounds %struct.dll, ptr %13, i32 0, i32 0
  %15 = load i32, ptr %14, align 8, !tbaa !13
  %16 = add i32 %15, 1
  store i32 %16, ptr %14, align 8, !tbaa !13
  %17 = load ptr, ptr %6, align 8, !tbaa !5
  %18 = icmp eq ptr %17, null
  br i1 %18, label %19, label %26

19:                                               ; preds = %2
  %20 = load ptr, ptr %5, align 8, !tbaa !5
  %21 = load ptr, ptr %3, align 8, !tbaa !5
  %22 = getelementptr inbounds %struct.dll, ptr %21, i32 0, i32 1
  store ptr %20, ptr %22, align 8, !tbaa !11
  %23 = load ptr, ptr %5, align 8, !tbaa !5
  %24 = load ptr, ptr %3, align 8, !tbaa !5
  %25 = getelementptr inbounds %struct.dll, ptr %24, i32 0, i32 2
  store ptr %23, ptr %25, align 8, !tbaa !14
  store i32 1, ptr %7, align 4
  br label %36

26:                                               ; preds = %2
  %27 = load ptr, ptr %5, align 8, !tbaa !5
  %28 = load ptr, ptr %6, align 8, !tbaa !5
  %29 = getelementptr inbounds %struct.node_, ptr %28, i32 0, i32 2
  store ptr %27, ptr %29, align 8, !tbaa !15
  %30 = load ptr, ptr %6, align 8, !tbaa !5
  %31 = load ptr, ptr %5, align 8, !tbaa !5
  %32 = getelementptr inbounds %struct.node_, ptr %31, i32 0, i32 1
  store ptr %30, ptr %32, align 8, !tbaa !17
  %33 = load ptr, ptr %5, align 8, !tbaa !5
  %34 = load ptr, ptr %3, align 8, !tbaa !5
  %35 = getelementptr inbounds %struct.dll, ptr %34, i32 0, i32 1
  store ptr %33, ptr %35, align 8, !tbaa !11
  store i32 0, ptr %7, align 4
  br label %36

36:                                               ; preds = %26, %19
  call void @llvm.lifetime.end.p0(i64 8, ptr %6) #2
  call void @llvm.lifetime.end.p0(i64 8, ptr %5) #2
  %37 = load i32, ptr %7, align 4
  switch i32 %37, label %39 [
    i32 0, label %38
    i32 1, label %38
  ]

38:                                               ; preds = %36, %36
  ret void

39:                                               ; preds = %36
  unreachable
}

attributes #0 = { nounwind uwtable "min-legal-vector-width"="0" "no-trapping-math"="true" "stack-protector-buffer-size"="8" "target-cpu"="x86-64" "target-features"="+cmov,+cx8,+fxsr,+mmx,+sse,+sse2,+x87" "tune-cpu"="generic" }
attributes #1 = { nocallback nofree nosync nounwind willreturn memory(argmem: readwrite) }
attributes #2 = { nounwind }

!llvm.module.flags = !{!0, !1, !2, !3}
!llvm.ident = !{!4}

!0 = !{i32 1, !"wchar_size", i32 4}
!1 = !{i32 8, !"PIC Level", i32 2}
!2 = !{i32 7, !"PIE Level", i32 2}
!3 = !{i32 7, !"uwtable", i32 2}
!4 = !{!"clang version 19.1.0 (git@github.com:llvm/llvm-project.git a4bf6cd7cfb1a1421ba92bca9d017b49936c55e4)"}
!5 = !{!6, !6, i64 0}
!6 = !{!"any pointer", !7, i64 0}
!7 = !{!"omnipotent char", !8, i64 0}
!8 = !{!"Simple C/C++ TBAA"}
!9 = !{!10, !10, i64 0}
!10 = !{!"int", !7, i64 0}
!11 = !{!12, !6, i64 8}
!12 = !{!"", !10, i64 0, !6, i64 8, !6, i64 16}
!13 = !{!12, !10, i64 0}
!14 = !{!12, !6, i64 16}
!15 = !{!16, !6, i64 16}
!16 = !{!"node_", !10, i64 0, !6, i64 8, !6, i64 16}
!17 = !{!16, !6, i64 8}


; Optimized IR (opt -passes='default<O3>'):
target datalayout = "e-m:e-p270:32:32-p271:32:32-p272:64:64-i64:64-i128:128-f80:128-n8:16:32:64-S128"
target triple = "x86_64-unknown-linux-gnu"

; Function Attrs: nounwind uwtable
declare dso_local ptr @createnode(i32 noundef) local_unnamed_addr #0

; Function Attrs: nounwind uwtable
define dso_local void @push_front(ptr nocapture noundef %0, i32 noundef %1) local_unnamed_addr #0 {
  %3 = tail call ptr @createnode(i32 noundef %1)
  %4 = getelementptr inbounds i8, ptr %0, i64 8
  %5 = load ptr, ptr %4, align 8, !tbaa !5
  %6 = load i32, ptr %0, align 8, !tbaa !11
  %7 = add i32 %6, 1
  store i32 %7, ptr %0, align 8, !tbaa !11
  %8 = icmp eq ptr %5, null
  br i1 %8, label %9, label %11

9:                                                ; preds = %2
  %10 = getelementptr inbounds i8, ptr %0, i64 16
  store ptr %3, ptr %10, align 8, !tbaa !12
  br label %14

11:                                               ; preds = %2
  %12 = getelementptr inbounds i8, ptr %5, i64 16
  store ptr %3, ptr %12, align 8, !tbaa !13
  %13 = getelementptr inbounds i8, ptr %3, i64 8
  store ptr %5, ptr %13, align 8, !tbaa !15
  br label %14

14:                                               ; preds = %11, %9
  store ptr %3, ptr %4, align 8
  ret void
}

attributes #0 = { nounwind uwtable "min-legal-vector-width"="0" "no-trapping-math"="true" "stack-protector-buffer-size"="8" "target-cpu"="x86-64" "target-features"="+cmov,+cx8,+fxsr,+mmx,+sse,+sse2,+x87" "tune-cpu"="generic" }

!llvm.module.flags = !{!0, !1, !2, !3}
!llvm.ident = !{!4}

!0 = !{i32 1, !"wchar_size", i32 4}
!1 = !{i32 8, !"PIC Level", i32 2}
!2 = !{i32 7, !"PIE Level", i32 2}
!3 = !{i32 7, !"uwtable", i32 2}
!4 = !{!"clang version 19.1.0 (git@github.com:llvm/llvm-project.git a4bf6cd7cfb1a1421ba92bca9d017b49936c55e4)"}
!5 = !{!6, !10, i64 8}
!6 = !{!"", !7, i64 0, !10, i64 8, !10, i64 16}
!7 = !{!"int", !8, i64 0}
!8 = !{!"omnipotent char", !9, i64 0}
!9 = !{!"Simple C/C++ TBAA"}
!10 = !{!"any pointer", !8, i64 0}
!11 = !{!6, !7, i64 0}
!12 = !{!6, !10, i64 16}
!13 = !{!14, !10, i64 16}
!14 = !{!"node_", !7, i64 0, !10, i64 8, !10, i64 16}
!15 = !{!14, !10, i64 8}


; Effective O3 passes: EarlyCSEPass,GlobalOptPass,InferFunctionAttrsPass,InstCombinePass,MergedLoadStoreMotionPass,PostOrderFunctionAttrsPass,SROAPass,SimplifyCFGPass,TailCallElimPass