; LLVM IR from KishanBGajera/2024-366-Days-Of-DSA :: Data Structures/Linear/Linked List/Doubly Linked List/C (main)

; 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.DoublyLinkedList = type { ptr, i32 }
%struct.Node = type { i32, ptr, ptr }

; Function Attrs: nocallback nofree nosync nounwind willreturn memory(argmem: readwrite)
declare void @llvm.lifetime.start.p0(i64 immarg, ptr nocapture) #0

; Function Attrs: nocallback nofree nosync nounwind willreturn memory(argmem: readwrite)
declare void @llvm.lifetime.end.p0(i64 immarg, ptr nocapture) #0

; Function Attrs: nounwind uwtable
declare dso_local void @freeNodeMemory(ptr noundef) #1

; Function Attrs: nounwind uwtable
declare dso_local zeroext i1 @isEmpty(ptr noundef) #1

; Function Attrs: nounwind uwtable
define dso_local void @removeNode(ptr noundef %0, i32 noundef %1) #1 {
  %3 = alloca ptr, align 8
  %4 = alloca i32, align 4
  %5 = alloca ptr, align 8
  %6 = alloca ptr, align 8
  store ptr %0, ptr %3, align 8, !tbaa !5
  store i32 %1, ptr %4, align 4, !tbaa !9
  %7 = load ptr, ptr %3, align 8, !tbaa !5
  %8 = call zeroext i1 @isEmpty(ptr noundef %7)
  br i1 %8, label %9, label %10

9:                                                ; preds = %2
  br label %59

10:                                               ; preds = %2
  call void @llvm.lifetime.start.p0(i64 8, ptr %5) #2
  %11 = load ptr, ptr %3, align 8, !tbaa !5
  %12 = getelementptr inbounds %struct.DoublyLinkedList, ptr %11, i32 0, i32 0
  %13 = load ptr, ptr %12, align 8, !tbaa !11
  store ptr %13, ptr %5, align 8, !tbaa !5
  br label %14

14:                                               ; preds = %29, %10
  %15 = load ptr, ptr %5, align 8, !tbaa !5
  %16 = getelementptr inbounds %struct.Node, ptr %15, i32 0, i32 2
  %17 = load ptr, ptr %16, align 8, !tbaa !13
  %18 = icmp ne ptr %17, null
  br i1 %18, label %19, label %27

19:                                               ; preds = %14
  %20 = load ptr, ptr %5, align 8, !tbaa !5
  %21 = getelementptr inbounds %struct.Node, ptr %20, i32 0, i32 2
  %22 = load ptr, ptr %21, align 8, !tbaa !13
  %23 = getelementptr inbounds %struct.Node, ptr %22, i32 0, i32 0
  %24 = load i32, ptr %23, align 8, !tbaa !15
  %25 = load i32, ptr %4, align 4, !tbaa !9
  %26 = icmp ne i32 %24, %25
  br label %27

27:                                               ; preds = %19, %14
  %28 = phi i1 [ false, %14 ], [ %26, %19 ]
  br i1 %28, label %29, label %33

29:                                               ; preds = %27
  %30 = load ptr, ptr %5, align 8, !tbaa !5
  %31 = getelementptr inbounds %struct.Node, ptr %30, i32 0, i32 2
  %32 = load ptr, ptr %31, align 8, !tbaa !13
  store ptr %32, ptr %5, align 8, !tbaa !5
  br label %14, !llvm.loop !16

33:                                               ; preds = %27
  %34 = load ptr, ptr %5, align 8, !tbaa !5
  %35 = getelementptr inbounds %struct.Node, ptr %34, i32 0, i32 2
  %36 = load ptr, ptr %35, align 8, !tbaa !13
  %37 = getelementptr inbounds %struct.Node, ptr %36, i32 0, i32 0
  %38 = load i32, ptr %37, align 8, !tbaa !15
  %39 = load i32, ptr %4, align 4, !tbaa !9
  %40 = icmp eq i32 %38, %39
  br i1 %40, label %41, label %58

41:                                               ; preds = %33
  %42 = load ptr, ptr %5, align 8, !tbaa !5
  %43 = load ptr, ptr %5, align 8, !tbaa !5
  %44 = getelementptr inbounds %struct.Node, ptr %43, i32 0, i32 2
  %45 = load ptr, ptr %44, align 8, !tbaa !13
  %46 = getelementptr inbounds %struct.Node, ptr %45, i32 0, i32 1
  store ptr %42, ptr %46, align 8, !tbaa !18
  call void @llvm.lifetime.start.p0(i64 8, ptr %6) #2
  %47 = load ptr, ptr %5, align 8, !tbaa !5
  %48 = getelementptr inbounds %struct.Node, ptr %47, i32 0, i32 2
  %49 = load ptr, ptr %48, align 8, !tbaa !13
  store ptr %49, ptr %6, align 8, !tbaa !5
  %50 = load ptr, ptr %5, align 8, !tbaa !5
  %51 = getelementptr inbounds %struct.Node, ptr %50, i32 0, i32 2
  %52 = load ptr, ptr %51, align 8, !tbaa !13
  %53 = getelementptr inbounds %struct.Node, ptr %52, i32 0, i32 2
  %54 = load ptr, ptr %53, align 8, !tbaa !13
  %55 = load ptr, ptr %5, align 8, !tbaa !5
  %56 = getelementptr inbounds %struct.Node, ptr %55, i32 0, i32 2
  store ptr %54, ptr %56, align 8, !tbaa !13
  %57 = load ptr, ptr %6, align 8, !tbaa !5
  call void @freeNodeMemory(ptr noundef %57)
  call void @llvm.lifetime.end.p0(i64 8, ptr %6) #2
  br label %58

58:                                               ; preds = %41, %33
  call void @llvm.lifetime.end.p0(i64 8, ptr %5) #2
  br label %59

59:                                               ; preds = %58, %9
  ret void
}

attributes #0 = { nocallback nofree nosync nounwind willreturn memory(argmem: readwrite) }
attributes #1 = { 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 #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 0}
!12 = !{!"DoublyLinkedList", !6, i64 0, !10, i64 8}
!13 = !{!14, !6, i64 16}
!14 = !{!"Node", !10, i64 0, !6, i64 8, !6, i64 16}
!15 = !{!14, !10, i64 0}
!16 = distinct !{!16, !17}
!17 = !{!"llvm.loop.mustprogress"}
!18 = !{!14, !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 void @freeNodeMemory(ptr noundef) local_unnamed_addr #0

; Function Attrs: nounwind uwtable
declare dso_local zeroext i1 @isEmpty(ptr noundef) local_unnamed_addr #0

; Function Attrs: nounwind uwtable
define dso_local void @removeNode(ptr noundef %0, i32 noundef %1) local_unnamed_addr #0 {
  %3 = tail call zeroext i1 @isEmpty(ptr noundef %0)
  br i1 %3, label %15, label %4

4:                                                ; preds = %2
  %5 = load ptr, ptr %0, align 8, !tbaa !5
  br label %6

6:                                                ; preds = %9, %4
  %.0 = phi ptr [ %5, %4 ], [ %8, %9 ]
  %7 = getelementptr inbounds i8, ptr %.0, i64 16
  %8 = load ptr, ptr %7, align 8, !tbaa !11
  %.not = icmp eq ptr %8, null
  br i1 %.not, label %.critedge, label %9

9:                                                ; preds = %6
  %10 = load i32, ptr %8, align 8, !tbaa !13
  %.not14 = icmp eq i32 %10, %1
  br i1 %.not14, label %.critedge, label %6, !llvm.loop !14

.critedge:                                        ; preds = %6, %9
  %11 = getelementptr inbounds i8, ptr %.0, i64 16
  %12 = getelementptr inbounds i8, ptr %8, i64 8
  store ptr %.0, ptr %12, align 8, !tbaa !16
  %13 = getelementptr inbounds i8, ptr %8, i64 16
  %14 = load ptr, ptr %13, align 8, !tbaa !11
  store ptr %14, ptr %11, align 8, !tbaa !11
  tail call void @freeNodeMemory(ptr noundef nonnull %8)
  br label %15

15:                                               ; preds = %.critedge, %2
  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, !7, i64 0}
!6 = !{!"DoublyLinkedList", !7, i64 0, !10, i64 8}
!7 = !{!"any pointer", !8, i64 0}
!8 = !{!"omnipotent char", !9, i64 0}
!9 = !{!"Simple C/C++ TBAA"}
!10 = !{!"int", !8, i64 0}
!11 = !{!12, !7, i64 16}
!12 = !{!"Node", !10, i64 0, !7, i64 8, !7, i64 16}
!13 = !{!12, !10, i64 0}
!14 = distinct !{!14, !15}
!15 = !{!"llvm.loop.mustprogress"}
!16 = !{!12, !7, i64 8}


; Effective O3 passes: CorrelatedValuePropagationPass,EarlyCSEPass,GVNPass,GlobalOptPass,InferFunctionAttrsPass,InstCombinePass,InstSimplifyPass,JumpThreadingPass,LCSSAPass,LICMPass,LoopUnrollPass,SCCPPass,SROAPass,SimplifyCFGPass,TailCallElimPass