; LLVM IR from 6leetcode/6leetcode :: questions/Algorithms/0018. 4Sum (Testing)

; 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"

; 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 i32 @compare(ptr noundef, ptr noundef) #1

; Function Attrs: nounwind uwtable
declare dso_local void @k_sum(ptr noundef, i32 noundef, i32 noundef, i32 noundef, i32 noundef, i32 noundef, ptr noundef, i32 noundef, ptr noundef, ptr noundef, ptr noundef) #1

; Function Attrs: nounwind allocsize(0)
declare noalias ptr @malloc(i64 noundef) #2

; Function Attrs: nounwind uwtable
define dso_local ptr @fourSum(ptr noundef %0, i32 noundef %1, i32 noundef %2, ptr noundef %3, ptr noundef %4) #1 {
  %6 = alloca ptr, align 8
  %7 = alloca i32, align 4
  %8 = alloca i32, align 4
  %9 = alloca ptr, align 8
  %10 = alloca ptr, align 8
  %11 = alloca i32, align 4
  %12 = alloca ptr, align 8
  %13 = alloca ptr, align 8
  store ptr %0, ptr %6, align 8, !tbaa !5
  store i32 %1, ptr %7, align 4, !tbaa !9
  store i32 %2, ptr %8, align 4, !tbaa !9
  store ptr %3, ptr %9, align 8, !tbaa !5
  store ptr %4, ptr %10, align 8, !tbaa !5
  %14 = load ptr, ptr %9, align 8, !tbaa !5
  store i32 0, ptr %14, align 4, !tbaa !9
  call void @llvm.lifetime.start.p0(i64 4, ptr %11) #5
  store i32 3, ptr %11, align 4, !tbaa !9
  call void @llvm.lifetime.start.p0(i64 8, ptr %12) #5
  %15 = load i32, ptr %11, align 4, !tbaa !9
  %16 = sext i32 %15 to i64
  %17 = mul i64 %16, 8
  %18 = call noalias ptr @malloc(i64 noundef %17) #6
  store ptr %18, ptr %12, align 8, !tbaa !5
  %19 = load i32, ptr %11, align 4, !tbaa !9
  %20 = sext i32 %19 to i64
  %21 = mul i64 %20, 4
  %22 = call noalias ptr @malloc(i64 noundef %21) #6
  %23 = load ptr, ptr %10, align 8, !tbaa !5
  store ptr %22, ptr %23, align 8, !tbaa !5
  %24 = load i32, ptr %7, align 4, !tbaa !9
  %25 = icmp sge i32 %24, 4
  br i1 %25, label %26, label %41

26:                                               ; preds = %5
  %27 = load ptr, ptr %6, align 8, !tbaa !5
  %28 = load i32, ptr %7, align 4, !tbaa !9
  %29 = sext i32 %28 to i64
  call void @qsort(ptr noundef %27, i64 noundef %29, i64 noundef 4, ptr noundef @compare)
  call void @llvm.lifetime.start.p0(i64 8, ptr %13) #5
  %30 = call noalias ptr @malloc(i64 noundef 16) #6
  store ptr %30, ptr %13, align 8, !tbaa !5
  %31 = load ptr, ptr %6, align 8, !tbaa !5
  %32 = load i32, ptr %7, align 4, !tbaa !9
  %33 = sub nsw i32 %32, 1
  %34 = load i32, ptr %8, align 4, !tbaa !9
  %35 = load ptr, ptr %13, align 8, !tbaa !5
  %36 = load ptr, ptr %12, align 8, !tbaa !5
  %37 = load ptr, ptr %9, align 8, !tbaa !5
  %38 = load ptr, ptr %10, align 8, !tbaa !5
  %39 = load ptr, ptr %38, align 8, !tbaa !5
  call void @k_sum(ptr noundef %31, i32 noundef 0, i32 noundef %33, i32 noundef %34, i32 noundef 4, i32 noundef 4, ptr noundef %35, i32 noundef 0, ptr noundef %36, ptr noundef %37, ptr noundef %39)
  %40 = load ptr, ptr %13, align 8, !tbaa !5
  call void @free(ptr noundef %40) #5
  call void @llvm.lifetime.end.p0(i64 8, ptr %13) #5
  br label %41

41:                                               ; preds = %26, %5
  %42 = load ptr, ptr %12, align 8, !tbaa !5
  call void @llvm.lifetime.end.p0(i64 8, ptr %12) #5
  call void @llvm.lifetime.end.p0(i64 4, ptr %11) #5
  ret ptr %42
}

declare void @qsort(ptr noundef, i64 noundef, i64 noundef, ptr noundef) #3

; Function Attrs: nounwind
declare void @free(ptr noundef) #4

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 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 #3 = { "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 #4 = { 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" }
attributes #5 = { nounwind }
attributes #6 = { 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/C++ TBAA"}
!9 = !{!10, !10, i64 0}
!10 = !{!"int", !7, 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 i32 @compare(ptr noundef, ptr noundef) #0

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

; Function Attrs: mustprogress nofree nounwind willreturn allockind("alloc,uninitialized") allocsize(0) memory(inaccessiblemem: readwrite)
declare noalias noundef ptr @malloc(i64 noundef) local_unnamed_addr #1

; Function Attrs: nounwind uwtable
define dso_local noundef ptr @fourSum(ptr noundef %0, i32 noundef %1, i32 noundef %2, ptr noundef %3, ptr nocapture noundef %4) local_unnamed_addr #0 {
  store i32 0, ptr %3, align 4, !tbaa !5
  %6 = tail call noalias dereferenceable_or_null(24) ptr @malloc(i64 noundef 24) #4
  %7 = tail call noalias dereferenceable_or_null(12) ptr @malloc(i64 noundef 12) #4
  store ptr %7, ptr %4, align 8, !tbaa !9
  %8 = icmp sgt i32 %1, 3
  br i1 %8, label %9, label %14

9:                                                ; preds = %5
  %10 = zext nneg i32 %1 to i64
  tail call void @qsort(ptr noundef %0, i64 noundef %10, i64 noundef 4, ptr noundef nonnull @compare) #5
  %11 = tail call noalias dereferenceable_or_null(16) ptr @malloc(i64 noundef 16) #4
  %12 = add nsw i32 %1, -1
  %13 = load ptr, ptr %4, align 8, !tbaa !9
  tail call void @k_sum(ptr noundef %0, i32 noundef 0, i32 noundef %12, i32 noundef %2, i32 noundef 4, i32 noundef 4, ptr noundef %11, i32 noundef 0, ptr noundef %6, ptr noundef nonnull %3, ptr noundef %13)
  tail call void @free(ptr noundef %11) #5
  br label %14

14:                                               ; preds = %9, %5
  ret ptr %6
}

; Function Attrs: nofree
declare void @qsort(ptr noundef, i64 noundef, i64 noundef, ptr nocapture noundef) local_unnamed_addr #2

; Function Attrs: mustprogress nounwind willreturn allockind("free") memory(argmem: readwrite, inaccessiblemem: readwrite)
declare void @free(ptr allocptr nocapture noundef) local_unnamed_addr #3

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 = { 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 #2 = { nofree "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 = { mustprogress nounwind willreturn allockind("free") memory(argmem: readwrite, 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 #4 = { nounwind allocsize(0) }
attributes #5 = { 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 = !{!"int", !7, i64 0}
!7 = !{!"omnipotent char", !8, i64 0}
!8 = !{!"Simple C/C++ TBAA"}
!9 = !{!10, !10, i64 0}
!10 = !{!"any pointer", !7, i64 0}


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