; LLVM IR from codeIIEST/Algorithms :: Competitive Coding/Linked List/Linked_Lists_based_on_POINTERS/Linked_List_operatio_c24b454a (ZN8linklist7reverseEv)

; 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.linklist = type { ptr }
%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 uwtable
declare dso_local void @_ZN8linklist7add_begEi(ptr noundef nonnull align 8 dereferenceable(8), i32 noundef) #1 align 2

; Function Attrs: mustprogress nounwind uwtable
declare dso_local noundef i32 @_ZN8linklist5countEv(ptr noundef nonnull align 8 dereferenceable(8)) #2 align 2

; Function Attrs: mustprogress uwtable
define dso_local ptr @_ZN8linklist7reverseEv(ptr noundef nonnull align 8 dereferenceable(8) %0) #1 align 2 {
  %2 = alloca %class.linklist, align 8
  %3 = alloca ptr, align 8
  %4 = alloca ptr, align 8
  %5 = alloca i32, align 4
  store ptr %0, ptr %3, align 8, !tbaa !5
  %6 = load ptr, ptr %3, align 8
  call void @llvm.lifetime.start.p0(i64 8, ptr %4) #3
  %7 = getelementptr inbounds %class.linklist, ptr %6, i32 0, i32 0
  %8 = load ptr, ptr %7, align 8, !tbaa !9
  store ptr %8, ptr %4, align 8, !tbaa !5
  call void @_ZN8linklistC1Ev(ptr noundef nonnull align 8 dereferenceable(8) %2)
  call void @llvm.lifetime.start.p0(i64 4, ptr %5) #3
  store i32 1, ptr %5, align 4, !tbaa !11
  br label %9

9:                                                ; preds = %21, %1
  %10 = load i32, ptr %5, align 4, !tbaa !11
  %11 = call noundef i32 @_ZN8linklist5countEv(ptr noundef nonnull align 8 dereferenceable(8) %6)
  %12 = icmp sle i32 %10, %11
  br i1 %12, label %14, label %13

13:                                               ; preds = %9
  call void @llvm.lifetime.end.p0(i64 4, ptr %5) #3
  br label %24

14:                                               ; preds = %9
  %15 = load ptr, ptr %4, align 8, !tbaa !5
  %16 = getelementptr inbounds %struct.node, ptr %15, i32 0, i32 0
  %17 = load i32, ptr %16, align 8, !tbaa !13
  call void @_ZN8linklist7add_begEi(ptr noundef nonnull align 8 dereferenceable(8) %2, i32 noundef %17)
  %18 = load ptr, ptr %4, align 8, !tbaa !5
  %19 = getelementptr inbounds %struct.node, ptr %18, i32 0, i32 1
  %20 = load ptr, ptr %19, align 8, !tbaa !15
  store ptr %20, ptr %4, align 8, !tbaa !5
  br label %21

21:                                               ; preds = %14
  %22 = load i32, ptr %5, align 4, !tbaa !11
  %23 = add nsw i32 %22, 1
  store i32 %23, ptr %5, align 4, !tbaa !11
  br label %9, !llvm.loop !16

24:                                               ; preds = %13
  call void @llvm.lifetime.end.p0(i64 8, ptr %4) #3
  %25 = getelementptr inbounds %class.linklist, ptr %2, i32 0, i32 0
  %26 = load ptr, ptr %25, align 8
  ret ptr %26
}

declare void @_ZN8linklistC1Ev(ptr)

attributes #0 = { nocallback nofree nosync nounwind willreturn memory(argmem: readwrite) }
attributes #1 = { mustprogress 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 = { 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 }

!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 0}
!10 = !{!"_ZTS8linklist", !6, i64 0}
!11 = !{!12, !12, i64 0}
!12 = !{!"int", !7, i64 0}
!13 = !{!14, !12, i64 0}
!14 = !{!"_ZTS4node", !12, i64 0, !6, i64 8}
!15 = !{!14, !6, i64 8}
!16 = distinct !{!16, !17}
!17 = !{!"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"

%class.linklist = type { ptr }

; Function Attrs: mustprogress uwtable
declare dso_local void @_ZN8linklist7add_begEi(ptr noundef nonnull align 8 dereferenceable(8), i32 noundef) local_unnamed_addr #0 align 2

; Function Attrs: mustprogress nounwind uwtable
declare dso_local noundef i32 @_ZN8linklist5countEv(ptr noundef nonnull align 8 dereferenceable(8)) local_unnamed_addr #1 align 2

; Function Attrs: mustprogress uwtable
define dso_local ptr @_ZN8linklist7reverseEv(ptr noundef nonnull align 8 dereferenceable(8) %0) local_unnamed_addr #0 align 2 {
  %2 = alloca %class.linklist, align 8
  %3 = load ptr, ptr %0, align 8, !tbaa !5
  call void @_ZN8linklistC1Ev(ptr noundef nonnull align 8 dereferenceable(8) %2)
  %4 = call noundef i32 @_ZN8linklist5countEv(ptr noundef nonnull align 8 dereferenceable(8) %0)
  %.not5 = icmp slt i32 %4, 1
  br i1 %.not5, label %._crit_edge, label %.lr.ph

._crit_edge:                                      ; preds = %.lr.ph, %1
  %5 = load ptr, ptr %2, align 8
  ret ptr %5

.lr.ph:                                           ; preds = %1, %.lr.ph
  %.07 = phi i32 [ %9, %.lr.ph ], [ 1, %1 ]
  %.046 = phi ptr [ %8, %.lr.ph ], [ %3, %1 ]
  %6 = load i32, ptr %.046, align 8, !tbaa !10
  call void @_ZN8linklist7add_begEi(ptr noundef nonnull align 8 dereferenceable(8) %2, i32 noundef %6)
  %7 = getelementptr inbounds i8, ptr %.046, i64 8
  %8 = load ptr, ptr %7, align 8, !tbaa !13
  %9 = add nuw nsw i32 %.07, 1
  %10 = call noundef i32 @_ZN8linklist5countEv(ptr noundef nonnull align 8 dereferenceable(8) %0)
  %.not.not = icmp slt i32 %.07, %10
  br i1 %.not.not, label %.lr.ph, label %._crit_edge, !llvm.loop !14
}

declare void @_ZN8linklistC1Ev(ptr) local_unnamed_addr

attributes #0 = { mustprogress 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 = { 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" }

!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 = !{!"_ZTS8linklist", !7, i64 0}
!7 = !{!"any pointer", !8, i64 0}
!8 = !{!"omnipotent char", !9, i64 0}
!9 = !{!"Simple C++ TBAA"}
!10 = !{!11, !12, i64 0}
!11 = !{!"_ZTS4node", !12, i64 0, !7, i64 8}
!12 = !{!"int", !8, i64 0}
!13 = !{!11, !7, i64 8}
!14 = distinct !{!14, !15}
!15 = !{!"llvm.loop.mustprogress"}


; Effective O3 passes: EarlyCSEPass,GlobalOptPass,InferFunctionAttrsPass,InstCombinePass,JumpThreadingPass,LoopRotatePass,LoopSimplifyPass,LoopUnrollPass,SROAPass,SimplifyCFGPass