; LLVM IR from MakeContributions/DSA :: algorithms/CPlusPlus/Linked-Lists (remove-duplicates-in-sorted-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.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: 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 @_Z16removeduplicatesP4Node(ptr noundef %0) #1 {
  %2 = alloca ptr, align 8
  %3 = alloca ptr, align 8
  %4 = alloca ptr, align 8
  store ptr %0, ptr %2, align 8, !tbaa !5
  call void @llvm.lifetime.start.p0(i64 8, ptr %3) #3
  %5 = load ptr, ptr %2, align 8, !tbaa !5
  store ptr %5, ptr %3, align 8, !tbaa !5
  br label %6

6:                                                ; preds = %45, %1
  %7 = load ptr, ptr %3, align 8, !tbaa !5
  %8 = icmp ne ptr %7, null
  br i1 %8, label %9, label %14

9:                                                ; preds = %6
  %10 = load ptr, ptr %3, align 8, !tbaa !5
  %11 = getelementptr inbounds %struct.Node, ptr %10, i32 0, i32 1
  %12 = load ptr, ptr %11, align 8, !tbaa !9
  %13 = icmp ne ptr %12, null
  br label %14

14:                                               ; preds = %9, %6
  %15 = phi i1 [ false, %6 ], [ %13, %9 ]
  br i1 %15, label %16, label %46

16:                                               ; preds = %14
  %17 = load ptr, ptr %3, align 8, !tbaa !5
  %18 = getelementptr inbounds %struct.Node, ptr %17, i32 0, i32 0
  %19 = load i32, ptr %18, align 8, !tbaa !12
  %20 = load ptr, ptr %3, align 8, !tbaa !5
  %21 = getelementptr inbounds %struct.Node, ptr %20, i32 0, i32 1
  %22 = load ptr, ptr %21, align 8, !tbaa !9
  %23 = getelementptr inbounds %struct.Node, ptr %22, i32 0, i32 0
  %24 = load i32, ptr %23, align 8, !tbaa !12
  %25 = icmp eq i32 %19, %24
  br i1 %25, label %26, label %41

26:                                               ; preds = %16
  call void @llvm.lifetime.start.p0(i64 8, ptr %4) #3
  %27 = load ptr, ptr %3, align 8, !tbaa !5
  %28 = getelementptr inbounds %struct.Node, ptr %27, i32 0, i32 1
  %29 = load ptr, ptr %28, align 8, !tbaa !9
  store ptr %29, ptr %4, align 8, !tbaa !5
  %30 = load ptr, ptr %3, align 8, !tbaa !5
  %31 = getelementptr inbounds %struct.Node, ptr %30, i32 0, i32 1
  %32 = load ptr, ptr %31, align 8, !tbaa !9
  %33 = getelementptr inbounds %struct.Node, ptr %32, i32 0, i32 1
  %34 = load ptr, ptr %33, align 8, !tbaa !9
  %35 = load ptr, ptr %3, align 8, !tbaa !5
  %36 = getelementptr inbounds %struct.Node, ptr %35, i32 0, i32 1
  store ptr %34, ptr %36, align 8, !tbaa !9
  %37 = load ptr, ptr %4, align 8, !tbaa !5
  %38 = icmp eq ptr %37, null
  br i1 %38, label %40, label %39

39:                                               ; preds = %26
  call void @_ZdlPvm(ptr noundef %37, i64 noundef 16) #4
  br label %40

40:                                               ; preds = %39, %26
  call void @llvm.lifetime.end.p0(i64 8, ptr %4) #3
  br label %45

41:                                               ; preds = %16
  %42 = load ptr, ptr %3, align 8, !tbaa !5
  %43 = getelementptr inbounds %struct.Node, ptr %42, i32 0, i32 1
  %44 = load ptr, ptr %43, align 8, !tbaa !9
  store ptr %44, ptr %3, align 8, !tbaa !5
  br label %45

45:                                               ; preds = %41, %40
  br label %6, !llvm.loop !13

46:                                               ; preds = %14
  call void @llvm.lifetime.end.p0(i64 8, ptr %3) #3
  ret void
}

; Function Attrs: nobuiltin nounwind
declare void @_ZdlPvm(ptr noundef, i64 noundef) #2

attributes #0 = { nocallback nofree nosync nounwind willreturn memory(argmem: readwrite) }
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 = { 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 #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, !6, i64 8}
!10 = !{!"_ZTS4Node", !11, i64 0, !6, i64 8}
!11 = !{!"int", !7, i64 0}
!12 = !{!10, !11, i64 0}
!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: mustprogress nounwind uwtable
define dso_local void @_Z16removeduplicatesP4Node(ptr noundef %0) local_unnamed_addr #0 {
  %.not12 = icmp eq ptr %0, null
  br i1 %.not12, label %.critedge, label %.lr.ph.preheader

.lr.ph.preheader:                                 ; preds = %1
  %2 = getelementptr inbounds i8, ptr %0, i64 8
  %3 = load ptr, ptr %2, align 8, !tbaa !5
  %.not1115 = icmp eq ptr %3, null
  br i1 %.not1115, label %.critedge, label %.lr.ph17

.lr.ph17:                                         ; preds = %.lr.ph.preheader, %.lr.ph
  %4 = phi ptr [ %13, %.lr.ph ], [ %3, %.lr.ph.preheader ]
  %5 = phi ptr [ %12, %.lr.ph ], [ %2, %.lr.ph.preheader ]
  %.01316 = phi ptr [ %.1, %.lr.ph ], [ %0, %.lr.ph.preheader ]
  %6 = load i32, ptr %.01316, align 8, !tbaa !11
  %7 = load i32, ptr %4, align 8, !tbaa !11
  %8 = icmp eq i32 %6, %7
  br i1 %8, label %9, label %.lr.ph

9:                                                ; preds = %.lr.ph17
  %10 = getelementptr inbounds i8, ptr %4, i64 8
  %11 = load ptr, ptr %10, align 8, !tbaa !5
  store ptr %11, ptr %5, align 8, !tbaa !5
  tail call void @_ZdlPvm(ptr noundef nonnull %4, i64 noundef 16) #2
  br label %.lr.ph

.lr.ph:                                           ; preds = %.lr.ph17, %9
  %.1 = phi ptr [ %.01316, %9 ], [ %4, %.lr.ph17 ]
  %12 = getelementptr inbounds i8, ptr %.1, i64 8
  %13 = load ptr, ptr %12, align 8, !tbaa !5
  %.not11 = icmp eq ptr %13, null
  br i1 %.not11, label %.critedge, label %.lr.ph17

.critedge:                                        ; preds = %.lr.ph, %.lr.ph.preheader, %1
  ret void
}

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

attributes #0 = { 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 #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 = { 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 = !{!6, !7, i64 0}


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