; LLVM IR from Innocentsax/sorting_algorithms :: 103-merge_sort (merge_sort_recursive)

; 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_subarr(ptr noundef, ptr noundef, i64 noundef, i64 noundef, i64 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 @merge_sort_recursive(ptr noundef %0, ptr noundef %1, i64 noundef %2, i64 noundef %3) #0 {
  %5 = alloca ptr, align 8
  %6 = alloca ptr, align 8
  %7 = alloca i64, align 8
  %8 = alloca i64, align 8
  %9 = alloca i64, align 8
  store ptr %0, ptr %5, align 8, !tbaa !5
  store ptr %1, ptr %6, align 8, !tbaa !5
  store i64 %2, ptr %7, align 8, !tbaa !9
  store i64 %3, ptr %8, align 8, !tbaa !9
  call void @llvm.lifetime.start.p0(i64 8, ptr %9) #2
  %10 = load i64, ptr %8, align 8, !tbaa !9
  %11 = load i64, ptr %7, align 8, !tbaa !9
  %12 = sub i64 %10, %11
  %13 = icmp ugt i64 %12, 1
  br i1 %13, label %14, label %34

14:                                               ; preds = %4
  %15 = load i64, ptr %7, align 8, !tbaa !9
  %16 = load i64, ptr %8, align 8, !tbaa !9
  %17 = load i64, ptr %7, align 8, !tbaa !9
  %18 = sub i64 %16, %17
  %19 = udiv i64 %18, 2
  %20 = add i64 %15, %19
  store i64 %20, ptr %9, align 8, !tbaa !9
  %21 = load ptr, ptr %5, align 8, !tbaa !5
  %22 = load ptr, ptr %6, align 8, !tbaa !5
  %23 = load i64, ptr %7, align 8, !tbaa !9
  %24 = load i64, ptr %9, align 8, !tbaa !9
  call void @merge_sort_recursive(ptr noundef %21, ptr noundef %22, i64 noundef %23, i64 noundef %24)
  %25 = load ptr, ptr %5, align 8, !tbaa !5
  %26 = load ptr, ptr %6, align 8, !tbaa !5
  %27 = load i64, ptr %9, align 8, !tbaa !9
  %28 = load i64, ptr %8, align 8, !tbaa !9
  call void @merge_sort_recursive(ptr noundef %25, ptr noundef %26, i64 noundef %27, i64 noundef %28)
  %29 = load ptr, ptr %5, align 8, !tbaa !5
  %30 = load ptr, ptr %6, align 8, !tbaa !5
  %31 = load i64, ptr %7, align 8, !tbaa !9
  %32 = load i64, ptr %9, align 8, !tbaa !9
  %33 = load i64, ptr %8, align 8, !tbaa !9
  call void @merge_subarr(ptr noundef %29, ptr noundef %30, i64 noundef %31, i64 noundef %32, i64 noundef %33)
  br label %34

34:                                               ; preds = %14, %4
  call void @llvm.lifetime.end.p0(i64 8, ptr %9) #2
  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" }
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 = !{!"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_subarr(ptr noundef, ptr noundef, i64 noundef, i64 noundef, i64 noundef) local_unnamed_addr #0

; Function Attrs: nounwind uwtable
define dso_local void @merge_sort_recursive(ptr noundef %0, ptr noundef %1, i64 noundef %2, i64 noundef %3) local_unnamed_addr #0 {
  %5 = sub i64 %3, %2
  %6 = icmp ugt i64 %5, 1
  br i1 %6, label %7, label %common.ret17

common.ret17:                                     ; preds = %4, %7
  ret void

7:                                                ; preds = %4
  %8 = lshr i64 %5, 1
  %9 = add i64 %8, %2
  tail call void @merge_sort_recursive(ptr noundef %0, ptr noundef %1, i64 noundef %2, i64 noundef %9)
  tail call void @merge_sort_recursive(ptr noundef %0, ptr noundef %1, i64 noundef %9, i64 noundef %3)
  tail call void @merge_subarr(ptr noundef %0, ptr noundef %1, i64 noundef %2, i64 noundef %9, i64 noundef %3)
  br label %common.ret17
}

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)"}


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