; LLVM IR from codemistic/Data-Structures-and-Algorithms :: CPP/LINKED LIST/DOUBLY LINKED LIST/microsoftquestion.ll (Z10deletenodeRP4nodei)

; 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
define dso_local void @_Z10deletenodeRP4nodei(ptr noundef nonnull align 8 dereferenceable(8) %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
  %8 = alloca ptr, align 8
  store ptr %0, ptr %3, align 8, !tbaa !5
  store i32 %1, ptr %4, align 4, !tbaa !9
  %9 = load ptr, ptr %3, align 8, !tbaa !5
  %10 = load ptr, ptr %9, align 8, !tbaa !5
  %11 = icmp eq ptr %10, null
  br i1 %11, label %12, label %13

12:                                               ; preds = %2
  br label %51

13:                                               ; preds = %2
  %14 = load i32, ptr %4, align 4, !tbaa !9
  %15 = icmp eq i32 %14, 1
  br i1 %15, label %16, label %23

16:                                               ; preds = %13
  call void @llvm.lifetime.start.p0(i64 8, ptr %5) #3
  %17 = load ptr, ptr %3, align 8, !tbaa !5
  %18 = load ptr, ptr %17, align 8, !tbaa !5
  store ptr %18, ptr %5, align 8, !tbaa !5
  %19 = load ptr, ptr %5, align 8, !tbaa !5
  %20 = icmp eq ptr %19, null
  br i1 %20, label %22, label %21

21:                                               ; preds = %16
  call void @_ZN4nodeD2Ev(ptr noundef nonnull align 8 dereferenceable(16) %19) #3
  call void @_ZdlPvm(ptr noundef %19, i64 noundef 16) #4
  br label %22

22:                                               ; preds = %21, %16
  call void @llvm.lifetime.end.p0(i64 8, ptr %5) #3
  br label %23

23:                                               ; preds = %22, %13
  call void @llvm.lifetime.start.p0(i64 4, ptr %6) #3
  store i32 1, ptr %6, align 4, !tbaa !9
  call void @llvm.lifetime.start.p0(i64 8, ptr %7) #3
  %24 = load ptr, ptr %3, align 8, !tbaa !5
  %25 = load ptr, ptr %24, align 8, !tbaa !5
  store ptr %25, ptr %7, align 8, !tbaa !5
  call void @llvm.lifetime.start.p0(i64 8, ptr %8) #3
  %26 = load ptr, ptr %3, align 8, !tbaa !5
  %27 = load ptr, ptr %26, align 8, !tbaa !5
  store ptr %27, ptr %8, align 8, !tbaa !5
  br label %28

28:                                               ; preds = %32, %23
  %29 = load i32, ptr %6, align 4, !tbaa !9
  %30 = load i32, ptr %4, align 4, !tbaa !9
  %31 = icmp slt i32 %29, %30
  br i1 %31, label %32, label %39

32:                                               ; preds = %28
  %33 = load ptr, ptr %8, align 8, !tbaa !5
  store ptr %33, ptr %7, align 8, !tbaa !5
  %34 = load ptr, ptr %8, align 8, !tbaa !5
  %35 = getelementptr inbounds %class.node, ptr %34, i32 0, i32 1
  %36 = load ptr, ptr %35, align 8, !tbaa !11
  store ptr %36, ptr %8, align 8, !tbaa !5
  %37 = load i32, ptr %6, align 4, !tbaa !9
  %38 = add nsw i32 %37, 1
  store i32 %38, ptr %6, align 4, !tbaa !9
  br label %28, !llvm.loop !13

39:                                               ; preds = %28
  %40 = load ptr, ptr %8, align 8, !tbaa !5
  %41 = getelementptr inbounds %class.node, ptr %40, i32 0, i32 1
  %42 = load ptr, ptr %41, align 8, !tbaa !11
  %43 = load ptr, ptr %7, align 8, !tbaa !5
  %44 = getelementptr inbounds %class.node, ptr %43, i32 0, i32 1
  store ptr %42, ptr %44, align 8, !tbaa !11
  %45 = load ptr, ptr %8, align 8, !tbaa !5
  %46 = getelementptr inbounds %class.node, ptr %45, i32 0, i32 1
  store ptr null, ptr %46, align 8, !tbaa !11
  %47 = load ptr, ptr %8, align 8, !tbaa !5
  %48 = icmp eq ptr %47, null
  br i1 %48, label %50, label %49

49:                                               ; preds = %39
  call void @_ZN4nodeD2Ev(ptr noundef nonnull align 8 dereferenceable(16) %47) #3
  call void @_ZdlPvm(ptr noundef %47, i64 noundef 16) #4
  br label %50

50:                                               ; preds = %49, %39
  call void @llvm.lifetime.end.p0(i64 8, ptr %8) #3
  call void @llvm.lifetime.end.p0(i64 8, ptr %7) #3
  call void @llvm.lifetime.end.p0(i64 4, ptr %6) #3
  br label %51

51:                                               ; preds = %50, %12
  ret void
}

; Function Attrs: mustprogress nounwind uwtable
declare dso_local void @_ZN4nodeD2Ev(ptr noundef nonnull align 8 dereferenceable(16)) unnamed_addr #2 align 2

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
define dso_local void @_Z10deletenodeRP4nodei(ptr nocapture noundef nonnull readonly align 8 dereferenceable(8) %0, i32 noundef %1) local_unnamed_addr #1 {
  %3 = load ptr, ptr %0, align 8, !tbaa !5
  %4 = icmp eq ptr %3, null
  br i1 %4, label %33, label %5

5:                                                ; preds = %2
  %6 = icmp eq i32 %1, 1
  br i1 %6, label %.thread, label %7

.thread:                                          ; preds = %5
  tail call void @_ZN4nodeD2Ev(ptr noundef nonnull align 8 dereferenceable(16) %3) #2
  tail call void @_ZdlPvm(ptr noundef nonnull %3, i64 noundef 16) #3
  %.pre = load ptr, ptr %0, align 8, !tbaa !5
  br label %._crit_edge

7:                                                ; preds = %5
  %8 = icmp sgt i32 %1, 1
  br i1 %8, label %.lr.ph.preheader, label %._crit_edge

.lr.ph.preheader:                                 ; preds = %7
  %9 = add nsw i32 %1, -1
  %10 = add nsw i32 %1, -2
  %xtraiter = and i32 %9, 7
  %11 = icmp ult i32 %10, 7
  br i1 %11, label %._crit_edge.loopexit.unr-lcssa, label %.lr.ph.preheader.new

.lr.ph.preheader.new:                             ; preds = %.lr.ph.preheader
  %unroll_iter = and i32 %9, -8
  br label %.lr.ph

.lr.ph:                                           ; preds = %.lr.ph, %.lr.ph.preheader.new
  %.018 = phi ptr [ %3, %.lr.ph.preheader.new ], [ %27, %.lr.ph ]
  %niter = phi i32 [ 0, %.lr.ph.preheader.new ], [ %niter.next.7, %.lr.ph ]
  %12 = getelementptr inbounds i8, ptr %.018, i64 8
  %13 = load ptr, ptr %12, align 8, !tbaa !9
  %14 = getelementptr inbounds i8, ptr %13, i64 8
  %15 = load ptr, ptr %14, align 8, !tbaa !9
  %16 = getelementptr inbounds i8, ptr %15, i64 8
  %17 = load ptr, ptr %16, align 8, !tbaa !9
  %18 = getelementptr inbounds i8, ptr %17, i64 8
  %19 = load ptr, ptr %18, align 8, !tbaa !9
  %20 = getelementptr inbounds i8, ptr %19, i64 8
  %21 = load ptr, ptr %20, align 8, !tbaa !9
  %22 = getelementptr inbounds i8, ptr %21, i64 8
  %23 = load ptr, ptr %22, align 8, !tbaa !9
  %24 = getelementptr inbounds i8, ptr %23, i64 8
  %25 = load ptr, ptr %24, align 8, !tbaa !9
  %26 = getelementptr inbounds i8, ptr %25, i64 8
  %27 = load ptr, ptr %26, align 8, !tbaa !9
  %niter.next.7 = add i32 %niter, 8
  %niter.ncmp.7 = icmp eq i32 %niter.next.7, %unroll_iter
  br i1 %niter.ncmp.7, label %._crit_edge.loopexit.unr-lcssa, label %.lr.ph, !llvm.loop !12

._crit_edge.loopexit.unr-lcssa:                   ; preds = %.lr.ph, %.lr.ph.preheader
  %.018.lcssa.ph = phi ptr [ poison, %.lr.ph.preheader ], [ %25, %.lr.ph ]
  %.lcssa.ph = phi ptr [ poison, %.lr.ph.preheader ], [ %27, %.lr.ph ]
  %.018.unr = phi ptr [ %3, %.lr.ph.preheader ], [ %27, %.lr.ph ]
  %lcmp.mod.not = icmp eq i32 %xtraiter, 0
  br i1 %lcmp.mod.not, label %._crit_edge, label %.lr.ph.epil

.lr.ph.epil:                                      ; preds = %._crit_edge.loopexit.unr-lcssa, %.lr.ph.epil
  %.018.epil = phi ptr [ %29, %.lr.ph.epil ], [ %.018.unr, %._crit_edge.loopexit.unr-lcssa ]
  %epil.iter = phi i32 [ %epil.iter.next, %.lr.ph.epil ], [ 0, %._crit_edge.loopexit.unr-lcssa ]
  %28 = getelementptr inbounds i8, ptr %.018.epil, i64 8
  %29 = load ptr, ptr %28, align 8, !tbaa !9
  %epil.iter.next = add i32 %epil.iter, 1
  %epil.iter.cmp.not = icmp eq i32 %epil.iter.next, %xtraiter
  br i1 %epil.iter.cmp.not, label %._crit_edge, label %.lr.ph.epil, !llvm.loop !14

._crit_edge:                                      ; preds = %._crit_edge.loopexit.unr-lcssa, %.lr.ph.epil, %.thread, %7
  %.014.lcssa = phi ptr [ %3, %7 ], [ %.pre, %.thread ], [ %.018.lcssa.ph, %._crit_edge.loopexit.unr-lcssa ], [ %.018.epil, %.lr.ph.epil ]
  %.0.lcssa = phi ptr [ %3, %7 ], [ %.pre, %.thread ], [ %.lcssa.ph, %._crit_edge.loopexit.unr-lcssa ], [ %29, %.lr.ph.epil ]
  %30 = getelementptr inbounds i8, ptr %.0.lcssa, i64 8
  %31 = load ptr, ptr %30, align 8, !tbaa !9
  %32 = getelementptr inbounds i8, ptr %.014.lcssa, i64 8
  store ptr %31, ptr %32, align 8, !tbaa !9
  store ptr null, ptr %30, align 8, !tbaa !9
  tail call void @_ZN4nodeD2Ev(ptr noundef nonnull align 8 dereferenceable(16) %.0.lcssa) #2
  tail call void @_ZdlPvm(ptr noundef %.0.lcssa, i64 noundef 16) #3
  br label %33

33:                                               ; preds = %._crit_edge, %2
  ret void
}

; Function Attrs: mustprogress nounwind uwtable
declare dso_local void @_ZN4nodeD2Ev(ptr noundef nonnull align 8 dereferenceable(16)) unnamed_addr #1 align 2

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 = { nounwind }
attributes #3 = { 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, !6, i64 8}
!10 = !{!"_ZTS4node", !11, i64 0, !6, i64 8}
!11 = !{!"int", !7, i64 0}
!12 = distinct !{!12, !13}
!13 = !{!"llvm.loop.mustprogress"}
!14 = distinct !{!14, !15}
!15 = !{!"llvm.loop.unroll.disable"}


; Effective O3 passes: CorrelatedValuePropagationPass,EarlyCSEPass,GVNPass,GlobalOptPass,IPSCCPPass,IndVarSimplifyPass,InferFunctionAttrsPass,InstCombinePass,InstSimplifyPass,JumpThreadingPass,LCSSAPass,LoopRotatePass,LoopSimplifyPass,LoopUnrollPass,PostOrderFunctionAttrsPass,SROAPass,SimplifyCFGPass,TailCallElimPass