; LLVM IR from HarshCasper/NeoAlgo :: C-Plus-Plus/sort/three_way_merge_sort.ll (Z20three_way_merge_sortPiiiS_)

; 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: mustprogress nounwind uwtable
declare dso_local void @_Z5mergePiiiiiS_(ptr noundef, i32 noundef, i32 noundef, i32 noundef, i32 noundef, ptr 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

; Function Attrs: mustprogress uwtable
define dso_local void @_Z20three_way_merge_sortPiiiS_(ptr noundef %0, i32 noundef %1, i32 noundef %2, ptr noundef %3) #2 {
  %5 = alloca ptr, align 8
  %6 = alloca i32, align 4
  %7 = alloca i32, align 4
  %8 = alloca ptr, align 8
  %9 = alloca i32, align 4
  %10 = alloca i32, align 4
  store ptr %0, ptr %5, align 8, !tbaa !5
  store i32 %1, ptr %6, align 4, !tbaa !9
  store i32 %2, ptr %7, align 4, !tbaa !9
  store ptr %3, ptr %8, align 8, !tbaa !5
  %11 = load i32, ptr %7, align 4, !tbaa !9
  %12 = load i32, ptr %6, align 4, !tbaa !9
  %13 = sub nsw i32 %11, %12
  %14 = icmp slt i32 %13, 2
  br i1 %14, label %15, label %16

15:                                               ; preds = %4
  br label %49

16:                                               ; preds = %4
  call void @llvm.lifetime.start.p0(i64 4, ptr %9) #3
  %17 = load i32, ptr %6, align 4, !tbaa !9
  %18 = load i32, ptr %7, align 4, !tbaa !9
  %19 = load i32, ptr %6, align 4, !tbaa !9
  %20 = sub nsw i32 %18, %19
  %21 = sdiv i32 %20, 3
  %22 = add nsw i32 %17, %21
  store i32 %22, ptr %9, align 4, !tbaa !9
  call void @llvm.lifetime.start.p0(i64 4, ptr %10) #3
  %23 = load i32, ptr %6, align 4, !tbaa !9
  %24 = load i32, ptr %7, align 4, !tbaa !9
  %25 = load i32, ptr %6, align 4, !tbaa !9
  %26 = sub nsw i32 %24, %25
  %27 = sdiv i32 %26, 3
  %28 = mul nsw i32 2, %27
  %29 = add nsw i32 %23, %28
  %30 = add nsw i32 %29, 1
  store i32 %30, ptr %10, align 4, !tbaa !9
  %31 = load ptr, ptr %8, align 8, !tbaa !5
  %32 = load i32, ptr %6, align 4, !tbaa !9
  %33 = load i32, ptr %9, align 4, !tbaa !9
  %34 = load ptr, ptr %5, align 8, !tbaa !5
  call void @_Z20three_way_merge_sortPiiiS_(ptr noundef %31, i32 noundef %32, i32 noundef %33, ptr noundef %34)
  %35 = load ptr, ptr %8, align 8, !tbaa !5
  %36 = load i32, ptr %9, align 4, !tbaa !9
  %37 = load i32, ptr %10, align 4, !tbaa !9
  %38 = load ptr, ptr %5, align 8, !tbaa !5
  call void @_Z20three_way_merge_sortPiiiS_(ptr noundef %35, i32 noundef %36, i32 noundef %37, ptr noundef %38)
  %39 = load ptr, ptr %8, align 8, !tbaa !5
  %40 = load i32, ptr %10, align 4, !tbaa !9
  %41 = load i32, ptr %7, align 4, !tbaa !9
  %42 = load ptr, ptr %5, align 8, !tbaa !5
  call void @_Z20three_way_merge_sortPiiiS_(ptr noundef %39, i32 noundef %40, i32 noundef %41, ptr noundef %42)
  %43 = load ptr, ptr %8, align 8, !tbaa !5
  %44 = load i32, ptr %6, align 4, !tbaa !9
  %45 = load i32, ptr %9, align 4, !tbaa !9
  %46 = load i32, ptr %10, align 4, !tbaa !9
  %47 = load i32, ptr %7, align 4, !tbaa !9
  %48 = load ptr, ptr %5, align 8, !tbaa !5
  call void @_Z5mergePiiiiiS_(ptr noundef %43, i32 noundef %44, i32 noundef %45, i32 noundef %46, i32 noundef %47, ptr noundef %48)
  call void @llvm.lifetime.end.p0(i64 4, ptr %10) #3
  call void @llvm.lifetime.end.p0(i64 4, ptr %9) #3
  br label %49

49:                                               ; preds = %16, %15
  ret void
}

attributes #0 = { 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 #1 = { nocallback nofree nosync nounwind willreturn memory(argmem: readwrite) }
attributes #2 = { mustprogress 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 }

!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}


; 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 nounwind uwtable
declare dso_local void @_Z5mergePiiiiiS_(ptr noundef, i32 noundef, i32 noundef, i32 noundef, i32 noundef, ptr noundef) local_unnamed_addr #0

; Function Attrs: mustprogress nounwind uwtable
define dso_local void @_Z20three_way_merge_sortPiiiS_(ptr noundef %0, i32 noundef %1, i32 noundef %2, ptr noundef %3) local_unnamed_addr #0 {
  %5 = sub nsw i32 %2, %1
  %6 = icmp slt i32 %5, 2
  br i1 %6, label %common.ret25, label %7

common.ret25:                                     ; preds = %4, %7
  ret void

7:                                                ; preds = %4
  %8 = udiv i32 %5, 3
  %9 = add nsw i32 %8, %1
  %10 = shl nuw nsw i32 %8, 1
  %11 = add i32 %1, 1
  %12 = add i32 %11, %10
  tail call void @_Z20three_way_merge_sortPiiiS_(ptr noundef %3, i32 noundef %1, i32 noundef %9, ptr noundef %0)
  tail call void @_Z20three_way_merge_sortPiiiS_(ptr noundef %3, i32 noundef %9, i32 noundef %12, ptr noundef %0)
  tail call void @_Z20three_way_merge_sortPiiiS_(ptr noundef %3, i32 noundef %12, i32 noundef %2, ptr noundef %0)
  tail call void @_Z5mergePiiiiiS_(ptr noundef %3, i32 noundef %1, i32 noundef %9, i32 noundef %12, i32 noundef %2, ptr noundef %0)
  br label %common.ret25
}

attributes #0 = { 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" }

!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)"}


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