; LLVM IR from KishanBGajera/2024-366-Days-Of-DSA :: Algorithms/Two Pointers - Hare and Tortoise Algorithm/Find Mid of Linked List/C (main)

; 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 }

@.str.7 = external hidden unnamed_addr constant [8 x i8], align 1

; Function Attrs: nounwind uwtable
declare dso_local ptr @getNode(i32 noundef) #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

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

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

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

; Function Attrs: nounwind uwtable
declare dso_local void @displayLinkedList(ptr noundef) #0

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

; Function Attrs: nounwind uwtable
define dso_local i32 @main() #0 {
  %1 = alloca i32, align 4
  %2 = alloca ptr, align 8
  %3 = alloca i32, align 4
  store i32 0, ptr %1, align 4
  call void @llvm.lifetime.start.p0(i64 8, ptr %2) #3
  %4 = call ptr (i32, ...) @getLinkedList(i32 noundef 10)
  store ptr %4, ptr %2, align 8, !tbaa !5
  call void @llvm.lifetime.start.p0(i64 4, ptr %3) #3
  store i32 0, ptr %3, align 4, !tbaa !9
  br label %5

5:                                                ; preds = %13, %0
  %6 = load i32, ptr %3, align 4, !tbaa !9
  %7 = icmp slt i32 %6, 10
  br i1 %7, label %9, label %8

8:                                                ; preds = %5
  call void @llvm.lifetime.end.p0(i64 4, ptr %3) #3
  br label %16

9:                                                ; preds = %5
  %10 = load ptr, ptr %2, align 8, !tbaa !5
  %11 = load i32, ptr %3, align 4, !tbaa !9
  %12 = call ptr @getNode(i32 noundef %11)
  call void @addToLinkedList(ptr noundef %10, ptr noundef %12)
  br label %13

13:                                               ; preds = %9
  %14 = load i32, ptr %3, align 4, !tbaa !9
  %15 = add nsw i32 %14, 1
  store i32 %15, ptr %3, align 4, !tbaa !9
  br label %5, !llvm.loop !11

16:                                               ; preds = %8
  %17 = load ptr, ptr %2, align 8, !tbaa !5
  call void @displayLinkedList(ptr noundef %17)
  %18 = load ptr, ptr %2, align 8, !tbaa !5
  %19 = call ptr @findMidNode(ptr noundef %18)
  %20 = getelementptr inbounds %struct.Node, ptr %19, i32 0, i32 0
  %21 = load i32, ptr %20, align 8, !tbaa !13
  %22 = call i32 (ptr, ...) @printf(ptr noundef @.str.7, i32 noundef %21)
  call void @llvm.lifetime.end.p0(i64 8, ptr %2) #3
  ret i32 0
}

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, !10, i64 0}
!10 = !{!"int", !7, i64 0}
!11 = distinct !{!11, !12}
!12 = !{!"llvm.loop.mustprogress"}
!13 = !{!14, !10, i64 0}
!14 = !{!"Node", !10, i64 0, !6, i64 8}


; 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.7 = external hidden unnamed_addr constant [8 x i8], align 1

; Function Attrs: nounwind uwtable
declare dso_local ptr @getNode(i32 noundef) local_unnamed_addr #0

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

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

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

; Function Attrs: nounwind uwtable
declare dso_local void @displayLinkedList(ptr noundef) local_unnamed_addr #0

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

; Function Attrs: nounwind uwtable
define dso_local noundef i32 @main() local_unnamed_addr #0 {
  %1 = tail call ptr (i32, ...) @getLinkedList(i32 noundef 10)
  %2 = tail call ptr @getNode(i32 noundef 0)
  tail call void @addToLinkedList(ptr noundef %1, ptr noundef %2)
  %3 = tail call ptr @getNode(i32 noundef 1)
  tail call void @addToLinkedList(ptr noundef %1, ptr noundef %3)
  %4 = tail call ptr @getNode(i32 noundef 2)
  tail call void @addToLinkedList(ptr noundef %1, ptr noundef %4)
  %5 = tail call ptr @getNode(i32 noundef 3)
  tail call void @addToLinkedList(ptr noundef %1, ptr noundef %5)
  %6 = tail call ptr @getNode(i32 noundef 4)
  tail call void @addToLinkedList(ptr noundef %1, ptr noundef %6)
  %7 = tail call ptr @getNode(i32 noundef 5)
  tail call void @addToLinkedList(ptr noundef %1, ptr noundef %7)
  %8 = tail call ptr @getNode(i32 noundef 6)
  tail call void @addToLinkedList(ptr noundef %1, ptr noundef %8)
  %9 = tail call ptr @getNode(i32 noundef 7)
  tail call void @addToLinkedList(ptr noundef %1, ptr noundef %9)
  %10 = tail call ptr @getNode(i32 noundef 8)
  tail call void @addToLinkedList(ptr noundef %1, ptr noundef %10)
  %11 = tail call ptr @getNode(i32 noundef 9)
  tail call void @addToLinkedList(ptr noundef %1, ptr noundef %11)
  tail call void @displayLinkedList(ptr noundef %1)
  %12 = tail call ptr @findMidNode(ptr noundef %1)
  %13 = load i32, ptr %12, align 8, !tbaa !5
  %14 = tail call i32 (ptr, ...) @printf(ptr noundef nonnull dereferenceable(1) @.str.7, i32 noundef %13)
  ret i32 0
}

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 0}
!6 = !{!"Node", !7, i64 0, !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}


; Effective O3 passes: EarlyCSEPass,GVNPass,GlobalOptPass,IndVarSimplifyPass,InferFunctionAttrsPass,InstCombinePass,LoopRotatePass,PostOrderFunctionAttrsPass,SROAPass,SimplifyCFGPass,TailCallElimPass