; LLVM IR from AnneLivia/Competitive-Programming :: Data Structures/Linked List/Circular Linked List (Implemented With Struct)/circula_56a7f4ce (backPP4Nodei)

; 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: nounwind allocsize(0)
declare noalias ptr @malloc(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 noundef zeroext i1 @_Z11insert_backPP4Nodei(ptr noundef %0, i32 noundef %1) #2 {
  %3 = alloca i1, align 1
  %4 = alloca ptr, align 8
  %5 = alloca i32, align 4
  %6 = alloca ptr, align 8
  %7 = alloca i32, align 4
  %8 = alloca ptr, align 8
  store ptr %0, ptr %4, align 8, !tbaa !5
  store i32 %1, ptr %5, align 4, !tbaa !9
  %9 = load ptr, ptr %4, align 8, !tbaa !5
  %10 = icmp eq ptr %9, null
  br i1 %10, label %11, label %12

11:                                               ; preds = %2
  store i1 false, ptr %3, align 1
  br label %54

12:                                               ; preds = %2
  call void @llvm.lifetime.start.p0(i64 8, ptr %6) #3
  %13 = call noalias ptr @malloc(i64 noundef 16) #4
  store ptr %13, ptr %6, align 8, !tbaa !5
  %14 = load ptr, ptr %6, align 8, !tbaa !5
  %15 = icmp eq ptr %14, null
  br i1 %15, label %16, label %17

16:                                               ; preds = %12
  store i1 false, ptr %3, align 1
  store i32 1, ptr %7, align 4
  br label %53

17:                                               ; preds = %12
  %18 = load i32, ptr %5, align 4, !tbaa !9
  %19 = load ptr, ptr %6, align 8, !tbaa !5
  %20 = getelementptr inbounds %struct.Node, ptr %19, i32 0, i32 0
  store i32 %18, ptr %20, align 8, !tbaa !11
  %21 = load ptr, ptr %4, align 8, !tbaa !5
  %22 = load ptr, ptr %21, align 8, !tbaa !5
  %23 = icmp eq ptr %22, null
  br i1 %23, label %24, label %30

24:                                               ; preds = %17
  %25 = load ptr, ptr %6, align 8, !tbaa !5
  %26 = load ptr, ptr %6, align 8, !tbaa !5
  %27 = getelementptr inbounds %struct.Node, ptr %26, i32 0, i32 1
  store ptr %25, ptr %27, align 8, !tbaa !13
  %28 = load ptr, ptr %6, align 8, !tbaa !5
  %29 = load ptr, ptr %4, align 8, !tbaa !5
  store ptr %28, ptr %29, align 8, !tbaa !5
  br label %52

30:                                               ; preds = %17
  %31 = load ptr, ptr %4, align 8, !tbaa !5
  %32 = load ptr, ptr %31, align 8, !tbaa !5
  %33 = load ptr, ptr %6, align 8, !tbaa !5
  %34 = getelementptr inbounds %struct.Node, ptr %33, i32 0, i32 1
  store ptr %32, ptr %34, align 8, !tbaa !13
  call void @llvm.lifetime.start.p0(i64 8, ptr %8) #3
  %35 = load ptr, ptr %4, align 8, !tbaa !5
  %36 = load ptr, ptr %35, align 8, !tbaa !5
  store ptr %36, ptr %8, align 8, !tbaa !5
  br label %37

37:                                               ; preds = %44, %30
  %38 = load ptr, ptr %8, align 8, !tbaa !5
  %39 = getelementptr inbounds %struct.Node, ptr %38, i32 0, i32 1
  %40 = load ptr, ptr %39, align 8, !tbaa !13
  %41 = load ptr, ptr %4, align 8, !tbaa !5
  %42 = load ptr, ptr %41, align 8, !tbaa !5
  %43 = icmp ne ptr %40, %42
  br i1 %43, label %44, label %48

44:                                               ; preds = %37
  %45 = load ptr, ptr %8, align 8, !tbaa !5
  %46 = getelementptr inbounds %struct.Node, ptr %45, i32 0, i32 1
  %47 = load ptr, ptr %46, align 8, !tbaa !13
  store ptr %47, ptr %8, align 8, !tbaa !5
  br label %37, !llvm.loop !14

48:                                               ; preds = %37
  %49 = load ptr, ptr %6, align 8, !tbaa !5
  %50 = load ptr, ptr %8, align 8, !tbaa !5
  %51 = getelementptr inbounds %struct.Node, ptr %50, i32 0, i32 1
  store ptr %49, ptr %51, align 8, !tbaa !13
  call void @llvm.lifetime.end.p0(i64 8, ptr %8) #3
  br label %52

52:                                               ; preds = %48, %24
  store i1 true, ptr %3, align 1
  store i32 1, ptr %7, align 4
  br label %53

53:                                               ; preds = %52, %16
  call void @llvm.lifetime.end.p0(i64 8, ptr %6) #3
  br label %54

54:                                               ; preds = %53, %11
  %55 = load i1, ptr %3, align 1
  ret i1 %55
}

attributes #0 = { nocallback nofree nosync nounwind willreturn memory(argmem: readwrite) }
attributes #1 = { nounwind allocsize(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 }
attributes #4 = { nounwind allocsize(0) }

!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, !10, i64 0}
!12 = !{!"_ZTS4Node", !10, i64 0, !6, i64 8}
!13 = !{!12, !6, i64 8}
!14 = distinct !{!14, !15}
!15 = !{!"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 nofree nounwind willreturn allockind("alloc,uninitialized") allocsize(0) memory(inaccessiblemem: readwrite)
declare noalias noundef ptr @malloc(i64 noundef) local_unnamed_addr #0

; Function Attrs: mustprogress nofree nounwind uwtable
define dso_local noundef zeroext i1 @_Z11insert_backPP4Nodei(ptr noundef %0, i32 noundef %1) local_unnamed_addr #1 {
  %3 = icmp eq ptr %0, null
  br i1 %3, label %17, label %4

4:                                                ; preds = %2
  %5 = tail call noalias dereferenceable_or_null(16) ptr @malloc(i64 noundef 16) #2
  %.not22 = icmp eq ptr %5, null
  br i1 %.not22, label %17, label %6

6:                                                ; preds = %4
  store i32 %1, ptr %5, align 8, !tbaa !5
  %7 = load ptr, ptr %0, align 8, !tbaa !11
  %8 = icmp eq ptr %7, null
  %9 = getelementptr inbounds i8, ptr %5, i64 8
  br i1 %8, label %10, label %11

10:                                               ; preds = %6
  store ptr %5, ptr %9, align 8, !tbaa !12
  br label %.sink.split

11:                                               ; preds = %6
  store ptr %7, ptr %9, align 8, !tbaa !12
  br label %12

12:                                               ; preds = %12, %11
  %.0 = phi ptr [ %7, %11 ], [ %14, %12 ]
  %13 = getelementptr inbounds i8, ptr %.0, i64 8
  %14 = load ptr, ptr %13, align 8, !tbaa !12
  %.not = icmp eq ptr %14, %7
  br i1 %.not, label %15, label %12, !llvm.loop !13

15:                                               ; preds = %12
  %16 = getelementptr inbounds i8, ptr %.0, i64 8
  br label %.sink.split

.sink.split:                                      ; preds = %10, %15
  %.sink = phi ptr [ %16, %15 ], [ %0, %10 ]
  store ptr %5, ptr %.sink, align 8, !tbaa !11
  br label %17

17:                                               ; preds = %.sink.split, %4, %2
  %.1 = phi i1 [ false, %2 ], [ false, %4 ], [ true, %.sink.split ]
  ret i1 %.1
}

attributes #0 = { mustprogress nofree nounwind willreturn allockind("alloc,uninitialized") allocsize(0) memory(inaccessiblemem: readwrite) "alloc-family"="malloc" "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 nofree 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 allocsize(0) }

!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 = !{!"_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 = !{!10, !10, i64 0}
!12 = !{!6, !10, i64 8}
!13 = distinct !{!13, !14}
!14 = !{!"llvm.loop.mustprogress"}


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