; LLVM IR from edualgo/dsa-code-store :: Linked-List/Linked-List-master/Source.ll (Z11remove_loopP4Node)

; 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: 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 @_Z11remove_loopP4Node(ptr noundef %0) #1 {
  %2 = alloca ptr, align 8
  %3 = alloca ptr, align 8
  %4 = alloca ptr, align 8
  %5 = alloca ptr, align 8
  %6 = alloca i32, align 4
  store ptr %0, ptr %2, align 8, !tbaa !5
  call void @llvm.lifetime.start.p0(i64 8, ptr %3) #2
  %7 = load ptr, ptr %2, align 8, !tbaa !5
  %8 = getelementptr inbounds %class.Node, ptr %7, i32 0, i32 1
  %9 = load ptr, ptr %8, align 8, !tbaa !9
  store ptr %9, ptr %3, align 8, !tbaa !5
  call void @llvm.lifetime.start.p0(i64 8, ptr %4) #2
  %10 = load ptr, ptr %2, align 8, !tbaa !5
  store ptr %10, ptr %4, align 8, !tbaa !5
  br label %11

11:                                               ; preds = %29, %1
  %12 = load ptr, ptr %3, align 8, !tbaa !5
  %13 = load ptr, ptr %4, align 8, !tbaa !5
  %14 = icmp ne ptr %12, %13
  br i1 %14, label %15, label %30

15:                                               ; preds = %11
  %16 = load ptr, ptr %3, align 8, !tbaa !5
  %17 = getelementptr inbounds %class.Node, ptr %16, i32 0, i32 1
  %18 = load ptr, ptr %17, align 8, !tbaa !9
  store ptr %18, ptr %3, align 8, !tbaa !5
  %19 = load ptr, ptr %4, align 8, !tbaa !5
  %20 = getelementptr inbounds %class.Node, ptr %19, i32 0, i32 1
  %21 = load ptr, ptr %20, align 8, !tbaa !9
  store ptr %21, ptr %4, align 8, !tbaa !5
  %22 = load ptr, ptr %3, align 8, !tbaa !5
  %23 = getelementptr inbounds %class.Node, ptr %22, i32 0, i32 1
  %24 = load ptr, ptr %23, align 8, !tbaa !9
  store ptr %24, ptr %3, align 8, !tbaa !5
  %25 = load ptr, ptr %3, align 8, !tbaa !5
  %26 = load ptr, ptr %4, align 8, !tbaa !5
  %27 = icmp eq ptr %25, %26
  br i1 %27, label %28, label %29

28:                                               ; preds = %15
  br label %30

29:                                               ; preds = %15
  br label %11, !llvm.loop !12

30:                                               ; preds = %28, %11
  call void @llvm.lifetime.start.p0(i64 8, ptr %5) #2
  %31 = load ptr, ptr %2, align 8, !tbaa !5
  store ptr %31, ptr %5, align 8, !tbaa !5
  %32 = load ptr, ptr %4, align 8, !tbaa !5
  %33 = getelementptr inbounds %class.Node, ptr %32, i32 0, i32 1
  %34 = load ptr, ptr %33, align 8, !tbaa !9
  store ptr %34, ptr %4, align 8, !tbaa !5
  br label %35

35:                                               ; preds = %51, %30
  %36 = load ptr, ptr %5, align 8, !tbaa !5
  %37 = load ptr, ptr %4, align 8, !tbaa !5
  %38 = icmp ne ptr %36, %37
  br i1 %38, label %39, label %55

39:                                               ; preds = %35
  %40 = load ptr, ptr %5, align 8, !tbaa !5
  %41 = getelementptr inbounds %class.Node, ptr %40, i32 0, i32 1
  %42 = load ptr, ptr %41, align 8, !tbaa !9
  store ptr %42, ptr %5, align 8, !tbaa !5
  %43 = load ptr, ptr %4, align 8, !tbaa !5
  %44 = getelementptr inbounds %class.Node, ptr %43, i32 0, i32 1
  %45 = load ptr, ptr %44, align 8, !tbaa !9
  %46 = load ptr, ptr %5, align 8, !tbaa !5
  %47 = icmp eq ptr %45, %46
  br i1 %47, label %48, label %51

48:                                               ; preds = %39
  %49 = load ptr, ptr %4, align 8, !tbaa !5
  %50 = getelementptr inbounds %class.Node, ptr %49, i32 0, i32 1
  store ptr null, ptr %50, align 8, !tbaa !9
  store i32 1, ptr %6, align 4
  br label %56

51:                                               ; preds = %39
  %52 = load ptr, ptr %4, align 8, !tbaa !5
  %53 = getelementptr inbounds %class.Node, ptr %52, i32 0, i32 1
  %54 = load ptr, ptr %53, align 8, !tbaa !9
  store ptr %54, ptr %4, align 8, !tbaa !5
  br label %35, !llvm.loop !14

55:                                               ; preds = %35
  store i32 0, ptr %6, align 4
  br label %56

56:                                               ; preds = %55, %48
  call void @llvm.lifetime.end.p0(i64 8, ptr %5) #2
  call void @llvm.lifetime.end.p0(i64 8, ptr %4) #2
  call void @llvm.lifetime.end.p0(i64 8, ptr %3) #2
  %57 = load i32, ptr %6, align 4
  switch i32 %57, label %59 [
    i32 0, label %58
    i32 1, label %58
  ]

58:                                               ; preds = %56, %56
  ret void

59:                                               ; preds = %56
  unreachable
}

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 = { 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, !13}


; 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 nofree norecurse nosync nounwind memory(readwrite, inaccessiblemem: none) uwtable
define dso_local void @_Z11remove_loopP4Node(ptr noundef readonly %0) local_unnamed_addr #0 {
  %2 = getelementptr inbounds i8, ptr %0, i64 8
  %3 = load ptr, ptr %2, align 8, !tbaa !5
  br label %4

4:                                                ; preds = %5, %1
  %.019 = phi ptr [ %3, %1 ], [ %11, %5 ]
  %.018 = phi ptr [ %0, %1 ], [ %9, %5 ]
  %.not = icmp eq ptr %.019, %.018
  br i1 %.not, label %13, label %5

5:                                                ; preds = %4
  %6 = getelementptr inbounds i8, ptr %.019, i64 8
  %7 = load ptr, ptr %6, align 8, !tbaa !5
  %8 = getelementptr inbounds i8, ptr %.018, i64 8
  %9 = load ptr, ptr %8, align 8, !tbaa !5
  %10 = getelementptr inbounds i8, ptr %7, i64 8
  %11 = load ptr, ptr %10, align 8, !tbaa !5
  %12 = icmp eq ptr %11, %9
  br i1 %12, label %13, label %4, !llvm.loop !11

13:                                               ; preds = %5, %4
  %.1 = phi ptr [ %9, %5 ], [ %.018, %4 ]
  %14 = getelementptr inbounds i8, ptr %.1, i64 8
  %15 = load ptr, ptr %14, align 8, !tbaa !5
  br label %16

16:                                               ; preds = %17, %13
  %.2 = phi ptr [ %15, %13 ], [ %21, %17 ]
  %.0 = phi ptr [ %0, %13 ], [ %19, %17 ]
  %.not25 = icmp eq ptr %.0, %.2
  br i1 %.not25, label %.loopexit, label %17

17:                                               ; preds = %16
  %18 = getelementptr inbounds i8, ptr %.0, i64 8
  %19 = load ptr, ptr %18, align 8, !tbaa !5
  %20 = getelementptr inbounds i8, ptr %.2, i64 8
  %21 = load ptr, ptr %20, align 8, !tbaa !5
  %22 = icmp eq ptr %21, %19
  br i1 %22, label %23, label %16, !llvm.loop !13

23:                                               ; preds = %17
  %24 = getelementptr inbounds i8, ptr %.2, i64 8
  store ptr null, ptr %24, align 8, !tbaa !5
  br label %.loopexit

.loopexit:                                        ; preds = %16, %23
  ret void
}

attributes #0 = { mustprogress nofree norecurse nosync nounwind memory(readwrite, inaccessiblemem: none) 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 = !{!"_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"}
!13 = distinct !{!13, !12}


; Effective O3 passes: EarlyCSEPass,GVNPass,GlobalOptPass,InferFunctionAttrsPass,InstCombinePass,InstSimplifyPass,JumpThreadingPass,LCSSAPass,LICMPass,LoopSimplifyPass,LoopUnrollPass,PostOrderFunctionAttrsPass,SROAPass,SimplifyCFGPass