; LLVM IR from h-ssiqueira/Sort_Algorithms :: src/merge (mergeSort)

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

; Function Attrs: nounwind uwtable
define dso_local void @mergeSort(ptr noundef %0, i32 noundef %1, i32 noundef %2) #0 {
  %4 = alloca ptr, align 8
  %5 = alloca i32, align 4
  %6 = alloca i32, align 4
  %7 = alloca i32, align 4
  %8 = alloca i32, align 4
  store ptr %0, ptr %4, align 8, !tbaa !5
  store i32 %1, ptr %5, align 4, !tbaa !9
  store i32 %2, ptr %6, align 4, !tbaa !9
  %9 = load i32, ptr %5, align 4, !tbaa !9
  %10 = load i32, ptr %6, align 4, !tbaa !9
  %11 = icmp slt i32 %9, %10
  br i1 %11, label %12, label %45

12:                                               ; preds = %3
  call void @llvm.lifetime.start.p0(i64 4, ptr %7) #2
  %13 = load i32, ptr %5, align 4, !tbaa !9
  %14 = load i32, ptr %6, align 4, !tbaa !9
  %15 = add nsw i32 %13, %14
  %16 = sdiv i32 %15, 2
  store i32 %16, ptr %7, align 4, !tbaa !9
  %17 = load ptr, ptr %4, align 8, !tbaa !5
  %18 = load i32, ptr %5, align 4, !tbaa !9
  %19 = load i32, ptr %7, align 4, !tbaa !9
  call void @mergeSort(ptr noundef %17, i32 noundef %18, i32 noundef %19)
  %20 = load ptr, ptr %4, align 8, !tbaa !5
  %21 = load i32, ptr %7, align 4, !tbaa !9
  %22 = add nsw i32 %21, 1
  %23 = load i32, ptr %6, align 4, !tbaa !9
  call void @mergeSort(ptr noundef %20, i32 noundef %22, i32 noundef %23)
  %24 = load ptr, ptr %4, align 8, !tbaa !5
  %25 = load i32, ptr %7, align 4, !tbaa !9
  %26 = sext i32 %25 to i64
  %27 = getelementptr inbounds i64, ptr %24, i64 %26
  %28 = load i64, ptr %27, align 8, !tbaa !11
  %29 = load ptr, ptr %4, align 8, !tbaa !5
  %30 = load i32, ptr %7, align 4, !tbaa !9
  %31 = add nsw i32 %30, 1
  %32 = sext i32 %31 to i64
  %33 = getelementptr inbounds i64, ptr %29, i64 %32
  %34 = load i64, ptr %33, align 8, !tbaa !11
  %35 = icmp slt i64 %28, %34
  br i1 %35, label %36, label %37

36:                                               ; preds = %12
  store i32 1, ptr %8, align 4
  br label %42

37:                                               ; preds = %12
  %38 = load ptr, ptr %4, align 8, !tbaa !5
  %39 = load i32, ptr %5, align 4, !tbaa !9
  %40 = load i32, ptr %7, align 4, !tbaa !9
  %41 = load i32, ptr %6, align 4, !tbaa !9
  call void @merge(ptr noundef %38, i32 noundef %39, i32 noundef %40, i32 noundef %41)
  store i32 0, ptr %8, align 4
  br label %42

42:                                               ; preds = %37, %36
  call void @llvm.lifetime.end.p0(i64 4, ptr %7) #2
  %43 = load i32, ptr %8, align 4
  switch i32 %43, label %46 [
    i32 0, label %44
    i32 1, label %45
  ]

44:                                               ; preds = %42
  br label %45

45:                                               ; preds = %44, %42, %3
  ret void

46:                                               ; preds = %42
  unreachable
}

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 = { 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 = !{!12, !12, i64 0}
!12 = !{!"long", !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 void @merge(ptr noundef, i32 noundef, i32 noundef, i32 noundef) local_unnamed_addr #0

; Function Attrs: nounwind uwtable
define dso_local void @mergeSort(ptr noundef %0, i32 noundef %1, i32 noundef %2) local_unnamed_addr #0 {
  %4 = icmp slt i32 %1, %2
  br i1 %4, label %5, label %17

5:                                                ; preds = %3
  %6 = add nsw i32 %2, %1
  %7 = sdiv i32 %6, 2
  tail call void @mergeSort(ptr noundef %0, i32 noundef %1, i32 noundef %7)
  %8 = add nsw i32 %7, 1
  tail call void @mergeSort(ptr noundef %0, i32 noundef %8, i32 noundef %2)
  %9 = sext i32 %7 to i64
  %10 = getelementptr inbounds i64, ptr %0, i64 %9
  %11 = load i64, ptr %10, align 8, !tbaa !5
  %12 = sext i32 %8 to i64
  %13 = getelementptr inbounds i64, ptr %0, i64 %12
  %14 = load i64, ptr %13, align 8, !tbaa !5
  %15 = icmp slt i64 %11, %14
  br i1 %15, label %17, label %16

16:                                               ; preds = %5
  tail call void @merge(ptr noundef nonnull %0, i32 noundef %1, i32 noundef %7, i32 noundef %2)
  br label %17

17:                                               ; preds = %16, %5, %3
  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" }

!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 = !{!"long", !7, i64 0}
!7 = !{!"omnipotent char", !8, i64 0}
!8 = !{!"Simple C/C++ TBAA"}


; Effective O3 passes: CorrelatedValuePropagationPass,EarlyCSEPass,GlobalOptPass,InferFunctionAttrsPass,ReassociatePass,SROAPass,SimplifyCFGPass,TailCallElimPass