; LLVM IR from div-bargali/Data-Structures-and-Algorithms :: C/Algorithms/Sorting-Algorithms/Merge Sort (mergesort_3way)

; 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: nounwind uwtable
define dso_local void @mergesort_3way(ptr noundef %0, i32 noundef %1, i32 noundef %2) #1 {
  %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
  %9 = 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
  %10 = load i32, ptr %6, align 4, !tbaa !9
  %11 = load i32, ptr %5, align 4, !tbaa !9
  %12 = icmp sle i32 %10, %11
  br i1 %12, label %13, label %14

13:                                               ; preds = %3
  br label %44

14:                                               ; preds = %3
  call void @llvm.lifetime.start.p0(i64 4, ptr %7) #2
  %15 = load i32, ptr %6, align 4, !tbaa !9
  %16 = load i32, ptr %5, align 4, !tbaa !9
  %17 = sub nsw i32 %15, %16
  store i32 %17, ptr %7, align 4, !tbaa !9
  call void @llvm.lifetime.start.p0(i64 4, ptr %8) #2
  %18 = load i32, ptr %5, align 4, !tbaa !9
  %19 = load i32, ptr %7, align 4, !tbaa !9
  %20 = sdiv i32 %19, 3
  %21 = add nsw i32 %18, %20
  store i32 %21, ptr %8, align 4, !tbaa !9
  call void @llvm.lifetime.start.p0(i64 4, ptr %9) #2
  %22 = load i32, ptr %5, align 4, !tbaa !9
  %23 = load i32, ptr %7, align 4, !tbaa !9
  %24 = sdiv i32 %23, 3
  %25 = mul nsw i32 2, %24
  %26 = add nsw i32 %22, %25
  %27 = add nsw i32 %26, 1
  store i32 %27, ptr %9, align 4, !tbaa !9
  %28 = load ptr, ptr %4, align 8, !tbaa !5
  %29 = load i32, ptr %5, align 4, !tbaa !9
  %30 = load i32, ptr %8, align 4, !tbaa !9
  call void @mergesort_3way(ptr noundef %28, i32 noundef %29, i32 noundef %30)
  %31 = load ptr, ptr %4, align 8, !tbaa !5
  %32 = load i32, ptr %8, align 4, !tbaa !9
  %33 = add nsw i32 %32, 1
  %34 = load i32, ptr %9, align 4, !tbaa !9
  call void @mergesort_3way(ptr noundef %31, i32 noundef %33, i32 noundef %34)
  %35 = load ptr, ptr %4, align 8, !tbaa !5
  %36 = load i32, ptr %9, align 4, !tbaa !9
  %37 = add nsw i32 %36, 1
  %38 = load i32, ptr %6, align 4, !tbaa !9
  call void @mergesort_3way(ptr noundef %35, i32 noundef %37, i32 noundef %38)
  %39 = load ptr, ptr %4, align 8, !tbaa !5
  %40 = load i32, ptr %5, align 4, !tbaa !9
  %41 = load i32, ptr %8, align 4, !tbaa !9
  %42 = load i32, ptr %9, align 4, !tbaa !9
  %43 = load i32, ptr %6, align 4, !tbaa !9
  call void @merge(ptr noundef %39, i32 noundef %40, i32 noundef %41, i32 noundef %42, i32 noundef %43)
  call void @llvm.lifetime.end.p0(i64 4, ptr %9) #2
  call void @llvm.lifetime.end.p0(i64 4, ptr %8) #2
  call void @llvm.lifetime.end.p0(i64 4, ptr %7) #2
  br label %44

44:                                               ; preds = %14, %13
  ret void
}

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

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, !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
define dso_local void @mergesort_3way(ptr noundef %0, i32 noundef %1, i32 noundef %2) local_unnamed_addr #0 {
  %.not = icmp sgt i32 %2, %1
  br i1 %.not, label %4, label %common.ret22

common.ret22:                                     ; preds = %3, %4
  ret void

4:                                                ; preds = %3
  %5 = sub nsw i32 %2, %1
  %6 = sdiv i32 %5, 3
  %7 = add nsw i32 %6, %1
  %8 = shl nsw i32 %6, 1
  %9 = add nsw i32 %8, %1
  %10 = add nsw i32 %9, 1
  tail call void @mergesort_3way(ptr noundef %0, i32 noundef %1, i32 noundef %7)
  %11 = add nsw i32 %7, 1
  tail call void @mergesort_3way(ptr noundef %0, i32 noundef %11, i32 noundef %10)
  %12 = add nsw i32 %9, 2
  tail call void @mergesort_3way(ptr noundef %0, i32 noundef %12, i32 noundef %2)
  tail call void @merge(ptr noundef %0, i32 noundef %1, i32 noundef %7, i32 noundef %10, i32 noundef %2)
  br label %common.ret22
}

; Function Attrs: nounwind uwtable
declare dso_local void @merge(ptr noundef, i32 noundef, i32 noundef, i32 noundef, i32 noundef) local_unnamed_addr #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)"}


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