; LLVM IR from HarshCasper/NeoAlgo :: C-Plus-Plus/ds/Circular_LinkedList.ll (Z3delP4nodei)

; 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"

%class.node = type { i32, ptr }

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

; Function Attrs: nobuiltin nounwind
declare void @_ZdlPvm(ptr noundef, i64 noundef) #1

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

; Function Attrs: mustprogress nounwind uwtable
declare dso_local noundef ptr @_Z7getnodeP4nodei(ptr noundef, i32 noundef) #2

; Function Attrs: mustprogress nounwind uwtable
define dso_local void @_Z3delP4nodei(ptr noundef %0, i32 noundef %1) #2 {
  %3 = alloca ptr, align 8
  %4 = alloca i32, align 4
  %5 = alloca ptr, align 8
  %6 = alloca i32, align 4
  %7 = alloca ptr, align 8
  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) #3
  %8 = load ptr, ptr %3, align 8, !tbaa !5
  %9 = load i32, ptr %4, align 4, !tbaa !9
  %10 = call noundef ptr @_Z7getnodeP4nodei(ptr noundef %8, i32 noundef %9)
  store ptr %10, ptr %5, align 8, !tbaa !5
  %11 = load ptr, ptr %5, align 8, !tbaa !5
  %12 = icmp eq ptr %11, null
  br i1 %12, label %13, label %14

13:                                               ; preds = %2
  store i32 1, ptr %6, align 4
  br label %44

14:                                               ; preds = %2
  %15 = load ptr, ptr %3, align 8, !tbaa !5
  %16 = load ptr, ptr %5, align 8, !tbaa !5
  %17 = icmp eq ptr %15, %16
  br i1 %17, label %18, label %22

18:                                               ; preds = %14
  %19 = load ptr, ptr %3, align 8, !tbaa !5
  %20 = getelementptr inbounds %class.node, ptr %19, i32 0, i32 1
  %21 = load ptr, ptr %20, align 8, !tbaa !11
  store ptr %21, ptr %3, align 8, !tbaa !5
  br label %22

22:                                               ; preds = %18, %14
  call void @llvm.lifetime.start.p0(i64 8, ptr %7) #3
  %23 = load ptr, ptr %3, align 8, !tbaa !5
  store ptr %23, ptr %7, align 8, !tbaa !5
  br label %24

24:                                               ; preds = %30, %22
  %25 = load ptr, ptr %7, align 8, !tbaa !5
  %26 = getelementptr inbounds %class.node, ptr %25, i32 0, i32 1
  %27 = load ptr, ptr %26, align 8, !tbaa !11
  %28 = load ptr, ptr %5, align 8, !tbaa !5
  %29 = icmp ne ptr %27, %28
  br i1 %29, label %30, label %34

30:                                               ; preds = %24
  %31 = load ptr, ptr %7, align 8, !tbaa !5
  %32 = getelementptr inbounds %class.node, ptr %31, i32 0, i32 1
  %33 = load ptr, ptr %32, align 8, !tbaa !11
  store ptr %33, ptr %7, align 8, !tbaa !5
  br label %24, !llvm.loop !13

34:                                               ; preds = %24
  %35 = load ptr, ptr %5, align 8, !tbaa !5
  %36 = getelementptr inbounds %class.node, ptr %35, i32 0, i32 1
  %37 = load ptr, ptr %36, align 8, !tbaa !11
  %38 = load ptr, ptr %7, align 8, !tbaa !5
  %39 = getelementptr inbounds %class.node, ptr %38, i32 0, i32 1
  store ptr %37, ptr %39, align 8, !tbaa !11
  %40 = load ptr, ptr %5, align 8, !tbaa !5
  %41 = icmp eq ptr %40, null
  br i1 %41, label %43, label %42

42:                                               ; preds = %34
  call void @_ZdlPvm(ptr noundef %40, i64 noundef 16) #4
  br label %43

43:                                               ; preds = %42, %34
  call void @llvm.lifetime.end.p0(i64 8, ptr %7) #3
  store i32 0, ptr %6, align 4
  br label %44

44:                                               ; preds = %43, %13
  call void @llvm.lifetime.end.p0(i64 8, ptr %5) #3
  %45 = load i32, ptr %6, align 4
  switch i32 %45, label %47 [
    i32 0, label %46
    i32 1, label %46
  ]

46:                                               ; preds = %44, %44
  ret void

47:                                               ; preds = %44
  unreachable
}

attributes #0 = { nocallback nofree nosync nounwind willreturn memory(argmem: readwrite) }
attributes #1 = { nobuiltin nounwind "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 = { mustprogress 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 #3 = { nounwind }
attributes #4 = { builtin 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++ TBAA"}
!9 = !{!10, !10, i64 0}
!10 = !{!"int", !7, i64 0}
!11 = !{!12, !6, i64 8}
!12 = !{!"_ZTS4node", !10, i64 0, !6, i64 8}
!13 = distinct !{!13, !14}
!14 = !{!"llvm.loop.mustprogress"}


; 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: nobuiltin nounwind
declare void @_ZdlPvm(ptr noundef, i64 noundef) local_unnamed_addr #0

; Function Attrs: mustprogress nounwind uwtable
declare dso_local noundef ptr @_Z7getnodeP4nodei(ptr noundef, i32 noundef) local_unnamed_addr #1

; Function Attrs: mustprogress nounwind uwtable
define dso_local void @_Z3delP4nodei(ptr noundef %0, i32 noundef %1) local_unnamed_addr #1 {
  %3 = tail call noundef ptr @_Z7getnodeP4nodei(ptr noundef %0, i32 noundef %1)
  %4 = icmp eq ptr %3, null
  br i1 %4, label %17, label %5

5:                                                ; preds = %2
  %6 = icmp eq ptr %3, %0
  br i1 %6, label %7, label %.preheader

7:                                                ; preds = %5
  %8 = getelementptr inbounds i8, ptr %0, i64 8
  %9 = load ptr, ptr %8, align 8, !tbaa !5
  br label %.preheader

.preheader:                                       ; preds = %7, %5
  %.0.ph = phi ptr [ %0, %5 ], [ %9, %7 ]
  br label %10

10:                                               ; preds = %.preheader, %10
  %.0 = phi ptr [ %12, %10 ], [ %.0.ph, %.preheader ]
  %11 = getelementptr inbounds i8, ptr %.0, i64 8
  %12 = load ptr, ptr %11, align 8, !tbaa !5
  %.not = icmp eq ptr %12, %3
  br i1 %.not, label %13, label %10, !llvm.loop !11

13:                                               ; preds = %10
  %14 = getelementptr inbounds i8, ptr %.0, i64 8
  %15 = getelementptr inbounds i8, ptr %3, i64 8
  %16 = load ptr, ptr %15, align 8, !tbaa !5
  store ptr %16, ptr %14, align 8, !tbaa !5
  tail call void @_ZdlPvm(ptr noundef %3, i64 noundef 16) #2
  br label %17

17:                                               ; preds = %2, %13
  ret void
}

attributes #0 = { nobuiltin nounwind "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 = { mustprogress 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 = { builtin 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, !10, i64 8}
!6 = !{!"_ZTS4node", !7, i64 0, !10, i64 8}
!7 = !{!"int", !8, i64 0}
!8 = !{!"omnipotent char", !9, i64 0}
!9 = !{!"Simple C++ TBAA"}
!10 = !{!"any pointer", !8, i64 0}
!11 = distinct !{!11, !12}
!12 = !{!"llvm.loop.mustprogress"}


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