; LLVM IR from AlgoGenesis/C :: Sorting Algorithms/Merge_k_Sorted_Lists (Merge k sorted lists)

; 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.MinHeap = type { i32, ptr }
%struct.MinHeapNode = type { 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: nounwind uwtable
declare dso_local void @minHeapify(ptr noundef, i32 noundef) #1

; Function Attrs: nounwind uwtable
define dso_local ptr @extractMin(ptr noundef %0) #1 {
  %2 = alloca ptr, align 8
  %3 = alloca ptr, align 8
  %4 = alloca ptr, align 8
  store ptr %0, ptr %3, align 8, !tbaa !5
  %5 = load ptr, ptr %3, align 8, !tbaa !5
  %6 = getelementptr inbounds %struct.MinHeap, ptr %5, i32 0, i32 0
  %7 = load i32, ptr %6, align 8, !tbaa !9
  %8 = icmp eq i32 %7, 0
  br i1 %8, label %9, label %10

9:                                                ; preds = %1
  store ptr null, ptr %2, align 8
  br label %44

10:                                               ; preds = %1
  call void @llvm.lifetime.start.p0(i64 8, ptr %4) #2
  %11 = load ptr, ptr %3, align 8, !tbaa !5
  %12 = getelementptr inbounds %struct.MinHeap, ptr %11, i32 0, i32 1
  %13 = load ptr, ptr %12, align 8, !tbaa !12
  %14 = getelementptr inbounds ptr, ptr %13, i64 0
  %15 = load ptr, ptr %14, align 8, !tbaa !5
  %16 = getelementptr inbounds %struct.MinHeapNode, ptr %15, i32 0, i32 0
  %17 = load ptr, ptr %16, align 8, !tbaa !13
  store ptr %17, ptr %4, align 8, !tbaa !5
  %18 = load ptr, ptr %3, align 8, !tbaa !5
  %19 = getelementptr inbounds %struct.MinHeap, ptr %18, i32 0, i32 0
  %20 = load i32, ptr %19, align 8, !tbaa !9
  %21 = icmp sgt i32 %20, 1
  br i1 %21, label %22, label %38

22:                                               ; preds = %10
  %23 = load ptr, ptr %3, align 8, !tbaa !5
  %24 = getelementptr inbounds %struct.MinHeap, ptr %23, i32 0, i32 1
  %25 = load ptr, ptr %24, align 8, !tbaa !12
  %26 = load ptr, ptr %3, align 8, !tbaa !5
  %27 = getelementptr inbounds %struct.MinHeap, ptr %26, i32 0, i32 0
  %28 = load i32, ptr %27, align 8, !tbaa !9
  %29 = sub nsw i32 %28, 1
  %30 = sext i32 %29 to i64
  %31 = getelementptr inbounds ptr, ptr %25, i64 %30
  %32 = load ptr, ptr %31, align 8, !tbaa !5
  %33 = load ptr, ptr %3, align 8, !tbaa !5
  %34 = getelementptr inbounds %struct.MinHeap, ptr %33, i32 0, i32 1
  %35 = load ptr, ptr %34, align 8, !tbaa !12
  %36 = getelementptr inbounds ptr, ptr %35, i64 0
  store ptr %32, ptr %36, align 8, !tbaa !5
  %37 = load ptr, ptr %3, align 8, !tbaa !5
  call void @minHeapify(ptr noundef %37, i32 noundef 0)
  br label %38

38:                                               ; preds = %22, %10
  %39 = load ptr, ptr %3, align 8, !tbaa !5
  %40 = getelementptr inbounds %struct.MinHeap, ptr %39, i32 0, i32 0
  %41 = load i32, ptr %40, align 8, !tbaa !9
  %42 = add nsw i32 %41, -1
  store i32 %42, ptr %40, align 8, !tbaa !9
  %43 = load ptr, ptr %4, align 8, !tbaa !5
  store ptr %43, ptr %2, align 8
  call void @llvm.lifetime.end.p0(i64 8, ptr %4) #2
  br label %44

44:                                               ; preds = %38, %9
  %45 = load ptr, ptr %2, align 8
  ret ptr %45
}

attributes #0 = { nocallback nofree nosync nounwind willreturn memory(argmem: readwrite) }
attributes #1 = { 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/C++ TBAA"}
!9 = !{!10, !11, i64 0}
!10 = !{!"MinHeap", !11, i64 0, !6, i64 8}
!11 = !{!"int", !7, i64 0}
!12 = !{!10, !6, i64 8}
!13 = !{!14, !6, i64 0}
!14 = !{!"MinHeapNode", !6, i64 0}


; 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: nounwind uwtable
declare dso_local void @minHeapify(ptr noundef, i32 noundef) local_unnamed_addr #0

; Function Attrs: nounwind uwtable
define dso_local ptr @extractMin(ptr noundef %0) local_unnamed_addr #0 {
  %2 = load i32, ptr %0, align 8, !tbaa !5
  %3 = icmp eq i32 %2, 0
  br i1 %3, label %18, label %4

4:                                                ; preds = %1
  %5 = getelementptr inbounds i8, ptr %0, i64 8
  %6 = load ptr, ptr %5, align 8, !tbaa !11
  %7 = load ptr, ptr %6, align 8, !tbaa !12
  %8 = load ptr, ptr %7, align 8, !tbaa !13
  %9 = icmp sgt i32 %2, 1
  br i1 %9, label %10, label %15

10:                                               ; preds = %4
  %11 = zext nneg i32 %2 to i64
  %12 = getelementptr ptr, ptr %6, i64 %11
  %13 = getelementptr i8, ptr %12, i64 -8
  %14 = load ptr, ptr %13, align 8, !tbaa !12
  store ptr %14, ptr %6, align 8, !tbaa !12
  tail call void @minHeapify(ptr noundef nonnull %0, i32 noundef 0)
  %.pre = load i32, ptr %0, align 8, !tbaa !5
  br label %15

15:                                               ; preds = %10, %4
  %16 = phi i32 [ %.pre, %10 ], [ %2, %4 ]
  %17 = add nsw i32 %16, -1
  store i32 %17, ptr %0, align 8, !tbaa !5
  br label %18

18:                                               ; preds = %1, %15
  %.0 = phi ptr [ %8, %15 ], [ null, %1 ]
  ret ptr %.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" }

!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 = !{!"MinHeap", !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}
!11 = !{!6, !10, i64 8}
!12 = !{!10, !10, i64 0}
!13 = !{!14, !10, i64 0}
!14 = !{!"MinHeapNode", !10, i64 0}


; Effective O3 passes: EarlyCSEPass,GVNPass,GlobalOptPass,IPSCCPPass,InferFunctionAttrsPass,InstCombinePass,SROAPass,SimplifyCFGPass,TailCallElimPass