; LLVM IR from bartobri/data-structures-c :: arrays/recursive-mergesort-wih-cutoff-to-insertion (sort)

; 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 @insertion(ptr 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
declare dso_local void @mergeAB(ptr noundef, ptr noundef, i32 noundef, ptr noundef, i32 noundef) #0

; Function Attrs: nounwind uwtable
define dso_local void @mergesortABr(ptr noundef %0, ptr noundef %1, i32 noundef %2, i32 noundef %3) #0 {
  %5 = alloca ptr, align 8
  %6 = alloca ptr, align 8
  %7 = alloca i32, align 4
  %8 = alloca i32, align 4
  %9 = alloca i32, align 4
  %10 = alloca i32, align 4
  store ptr %0, ptr %5, align 8, !tbaa !5
  store ptr %1, ptr %6, align 8, !tbaa !5
  store i32 %2, ptr %7, align 4, !tbaa !9
  store i32 %3, ptr %8, align 4, !tbaa !9
  call void @llvm.lifetime.start.p0(i64 4, ptr %9) #2
  %11 = load i32, ptr %7, align 4, !tbaa !9
  %12 = load i32, ptr %8, align 4, !tbaa !9
  %13 = add nsw i32 %11, %12
  %14 = sdiv i32 %13, 2
  store i32 %14, ptr %9, align 4, !tbaa !9
  %15 = load i32, ptr %8, align 4, !tbaa !9
  %16 = load i32, ptr %7, align 4, !tbaa !9
  %17 = sub nsw i32 %15, %16
  %18 = icmp sle i32 %17, 10
  br i1 %18, label %19, label %23

19:                                               ; preds = %4
  %20 = load ptr, ptr %5, align 8, !tbaa !5
  %21 = load i32, ptr %7, align 4, !tbaa !9
  %22 = load i32, ptr %8, align 4, !tbaa !9
  call void @insertion(ptr noundef %20, i32 noundef %21, i32 noundef %22)
  store i32 1, ptr %10, align 4
  br label %53

23:                                               ; preds = %4
  %24 = load ptr, ptr %6, align 8, !tbaa !5
  %25 = load ptr, ptr %5, align 8, !tbaa !5
  %26 = load i32, ptr %7, align 4, !tbaa !9
  %27 = load i32, ptr %9, align 4, !tbaa !9
  call void @mergesortABr(ptr noundef %24, ptr noundef %25, i32 noundef %26, i32 noundef %27)
  %28 = load ptr, ptr %6, align 8, !tbaa !5
  %29 = load ptr, ptr %5, align 8, !tbaa !5
  %30 = load i32, ptr %9, align 4, !tbaa !9
  %31 = add nsw i32 %30, 1
  %32 = load i32, ptr %8, align 4, !tbaa !9
  call void @mergesortABr(ptr noundef %28, ptr noundef %29, i32 noundef %31, i32 noundef %32)
  %33 = load ptr, ptr %5, align 8, !tbaa !5
  %34 = load i32, ptr %7, align 4, !tbaa !9
  %35 = sext i32 %34 to i64
  %36 = getelementptr inbounds i32, ptr %33, i64 %35
  %37 = load ptr, ptr %6, align 8, !tbaa !5
  %38 = load i32, ptr %7, align 4, !tbaa !9
  %39 = sext i32 %38 to i64
  %40 = getelementptr inbounds i32, ptr %37, i64 %39
  %41 = load i32, ptr %9, align 4, !tbaa !9
  %42 = load i32, ptr %7, align 4, !tbaa !9
  %43 = sub nsw i32 %41, %42
  %44 = add nsw i32 %43, 1
  %45 = load ptr, ptr %6, align 8, !tbaa !5
  %46 = load i32, ptr %9, align 4, !tbaa !9
  %47 = sext i32 %46 to i64
  %48 = getelementptr inbounds i32, ptr %45, i64 %47
  %49 = getelementptr inbounds i32, ptr %48, i64 1
  %50 = load i32, ptr %8, align 4, !tbaa !9
  %51 = load i32, ptr %9, align 4, !tbaa !9
  %52 = sub nsw i32 %50, %51
  call void @mergeAB(ptr noundef %36, ptr noundef %40, i32 noundef %44, ptr noundef %49, i32 noundef %52)
  store i32 0, ptr %10, align 4
  br label %53

53:                                               ; preds = %23, %19
  call void @llvm.lifetime.end.p0(i64 4, ptr %9) #2
  %54 = load i32, ptr %10, align 4
  switch i32 %54, label %56 [
    i32 0, label %55
    i32 1, label %55
  ]

55:                                               ; preds = %53, %53
  ret void

56:                                               ; preds = %53
  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}


; 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 @insertion(ptr noundef, i32 noundef, i32 noundef) local_unnamed_addr #0

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

; Function Attrs: nounwind uwtable
define dso_local void @mergesortABr(ptr noundef %0, ptr noundef %1, i32 noundef %2, i32 noundef %3) local_unnamed_addr #0 {
  %5 = sub nsw i32 %3, %2
  %6 = icmp slt i32 %5, 11
  br i1 %6, label %common.ret, label %7

common.ret:                                       ; preds = %4
  tail call void @insertion(ptr noundef %0, i32 noundef %2, i32 noundef %3)
  br label %common.ret24

common.ret24:                                     ; preds = %7, %common.ret
  ret void

7:                                                ; preds = %4
  %8 = add nsw i32 %3, %2
  %9 = sdiv i32 %8, 2
  tail call void @mergesortABr(ptr noundef %1, ptr noundef %0, i32 noundef %2, i32 noundef %9)
  %10 = add nsw i32 %9, 1
  tail call void @mergesortABr(ptr noundef %1, ptr noundef %0, i32 noundef %10, i32 noundef %3)
  %11 = sext i32 %2 to i64
  %12 = getelementptr inbounds i32, ptr %0, i64 %11
  %13 = getelementptr inbounds i32, ptr %1, i64 %11
  %reass.sub = sub i32 %9, %2
  %14 = add i32 %reass.sub, 1
  %15 = sext i32 %9 to i64
  %16 = getelementptr inbounds i32, ptr %1, i64 %15
  %17 = getelementptr inbounds i8, ptr %16, i64 4
  %18 = sub nsw i32 %3, %9
  tail call void @mergeAB(ptr noundef %12, ptr noundef %13, i32 noundef %14, ptr noundef nonnull %17, i32 noundef %18)
  br label %common.ret24
}

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,ReassociatePass,SROAPass,SimplifyCFGPass,TailCallElimPass