; LLVM IR from ahampriyanshu/algo-ds-101 :: Data-Structures/LinkedList/Circular_Linked_List (CircularLinkedList)

; 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, i32, ptr }

@.str.1 = external hidden unnamed_addr constant [9 x i8], align 1
@.str.3 = external hidden unnamed_addr constant [16 x i8], align 1
@.str.4 = external hidden unnamed_addr constant [16 x i8], align 1
@.str.5 = external hidden unnamed_addr constant [33 x i8], align 1

; Function Attrs: nounwind uwtable
declare dso_local zeroext i1 @isEmpty() #0

; Function Attrs: nocallback nofree nosync nounwind willreturn memory(argmem: readwrite)
declare void @llvm.lifetime.start.p0(i64 immarg, ptr nocapture) #1

; Function Attrs: nocallback nofree nosync nounwind willreturn memory(argmem: readwrite)
declare void @llvm.lifetime.end.p0(i64 immarg, ptr nocapture) #1

; Function Attrs: nounwind uwtable
declare dso_local void @insertFirst(i32 noundef, i32 noundef) #0

; Function Attrs: nounwind uwtable
declare dso_local ptr @deleteFirst() #0

; Function Attrs: nounwind uwtable
declare dso_local void @printList() #0

declare i32 @printf(ptr noundef, ...) #2

; Function Attrs: nounwind uwtable
define dso_local void @main() #0 {
  %1 = alloca ptr, align 8
  call void @insertFirst(i32 noundef 1, i32 noundef 10)
  call void @insertFirst(i32 noundef 2, i32 noundef 20)
  call void @insertFirst(i32 noundef 3, i32 noundef 30)
  call void @insertFirst(i32 noundef 4, i32 noundef 1)
  call void @insertFirst(i32 noundef 5, i32 noundef 40)
  call void @insertFirst(i32 noundef 6, i32 noundef 56)
  %2 = call i32 (ptr, ...) @printf(ptr noundef @.str.3)
  call void @printList()
  br label %3

3:                                                ; preds = %6, %0
  %4 = call zeroext i1 @isEmpty()
  %5 = xor i1 %4, true
  br i1 %5, label %6, label %16

6:                                                ; preds = %3
  call void @llvm.lifetime.start.p0(i64 8, ptr %1) #3
  %7 = call ptr @deleteFirst()
  store ptr %7, ptr %1, align 8, !tbaa !5
  %8 = call i32 (ptr, ...) @printf(ptr noundef @.str.4)
  %9 = load ptr, ptr %1, align 8, !tbaa !5
  %10 = getelementptr inbounds %struct.node, ptr %9, i32 0, i32 1
  %11 = load i32, ptr %10, align 4, !tbaa !9
  %12 = load ptr, ptr %1, align 8, !tbaa !5
  %13 = getelementptr inbounds %struct.node, ptr %12, i32 0, i32 0
  %14 = load i32, ptr %13, align 8, !tbaa !12
  %15 = call i32 (ptr, ...) @printf(ptr noundef @.str.1, i32 noundef %11, i32 noundef %14)
  call void @llvm.lifetime.end.p0(i64 8, ptr %1) #3
  br label %3, !llvm.loop !13

16:                                               ; preds = %3
  %17 = call i32 (ptr, ...) @printf(ptr noundef @.str.5)
  call void @printList()
  ret void
}

attributes #0 = { 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 = { nocallback nofree nosync nounwind willreturn memory(argmem: readwrite) }
attributes #2 = { "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/C++ TBAA"}
!9 = !{!10, !11, i64 4}
!10 = !{!"node", !11, i64 0, !11, i64 4, !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"

@.str.1 = external hidden unnamed_addr constant [9 x i8], align 1
@.str.3 = external hidden unnamed_addr constant [16 x i8], align 1
@.str.4 = external hidden unnamed_addr constant [16 x i8], align 1
@.str.5 = external hidden unnamed_addr constant [33 x i8], align 1

; Function Attrs: nounwind uwtable
declare dso_local zeroext i1 @isEmpty() local_unnamed_addr #0

; Function Attrs: nounwind uwtable
declare dso_local void @insertFirst(i32 noundef, i32 noundef) local_unnamed_addr #0

; Function Attrs: nounwind uwtable
declare dso_local ptr @deleteFirst() local_unnamed_addr #0

; Function Attrs: nounwind uwtable
declare dso_local void @printList() local_unnamed_addr #0

; Function Attrs: nofree nounwind
declare noundef i32 @printf(ptr nocapture noundef readonly, ...) local_unnamed_addr #1

; Function Attrs: nounwind uwtable
define dso_local void @main() local_unnamed_addr #0 {
  tail call void @insertFirst(i32 noundef 1, i32 noundef 10)
  tail call void @insertFirst(i32 noundef 2, i32 noundef 20)
  tail call void @insertFirst(i32 noundef 3, i32 noundef 30)
  tail call void @insertFirst(i32 noundef 4, i32 noundef 1)
  tail call void @insertFirst(i32 noundef 5, i32 noundef 40)
  tail call void @insertFirst(i32 noundef 6, i32 noundef 56)
  %1 = tail call i32 (ptr, ...) @printf(ptr noundef nonnull dereferenceable(1) @.str.3)
  tail call void @printList()
  %2 = tail call zeroext i1 @isEmpty()
  br i1 %2, label %._crit_edge, label %.lr.ph

.lr.ph:                                           ; preds = %0, %.lr.ph
  %3 = tail call ptr @deleteFirst()
  %4 = tail call i32 (ptr, ...) @printf(ptr noundef nonnull dereferenceable(1) @.str.4)
  %5 = getelementptr inbounds i8, ptr %3, i64 4
  %6 = load i32, ptr %5, align 4, !tbaa !5
  %7 = load i32, ptr %3, align 8, !tbaa !11
  %8 = tail call i32 (ptr, ...) @printf(ptr noundef nonnull dereferenceable(1) @.str.1, i32 noundef %6, i32 noundef %7)
  %9 = tail call zeroext i1 @isEmpty()
  br i1 %9, label %._crit_edge, label %.lr.ph, !llvm.loop !12

._crit_edge:                                      ; preds = %.lr.ph, %0
  %10 = tail call i32 (ptr, ...) @printf(ptr noundef nonnull dereferenceable(1) @.str.5)
  tail call void @printList()
  ret void
}

attributes #0 = { 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 = { nofree 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" }

!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 4}
!6 = !{!"node", !7, i64 0, !7, i64 4, !10, i64 8}
!7 = !{!"int", !8, i64 0}
!8 = !{!"omnipotent char", !9, i64 0}
!9 = !{!"Simple C/C++ TBAA"}
!10 = !{!"any pointer", !8, i64 0}
!11 = !{!6, !7, i64 0}
!12 = distinct !{!12, !13}
!13 = !{!"llvm.loop.mustprogress"}


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