; LLVM IR from gzc/CLRS :: C02-Getting-Started/exercise_code/inversions.ll (Z9MergeSortRSt6vectorIiSaIiEEiiRi)

; 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 uwtable
declare dso_local void @_Z24MergeWithCountInversionsRSt6vectorIiSaIiEEiiiRi(ptr noundef nonnull align 8 dereferenceable(24), i32 noundef, i32 noundef, i32 noundef, ptr noundef nonnull align 4 dereferenceable(4)) #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 @_Z9MergeSortRSt6vectorIiSaIiEEiiRi(ptr noundef nonnull align 8 dereferenceable(24) %0, i32 noundef %1, i32 noundef %2, ptr noundef nonnull align 4 dereferenceable(4) %3) #0 {
  %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
  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
  %10 = load i32, ptr %6, align 4, !tbaa !9
  %11 = load i32, ptr %7, align 4, !tbaa !9
  %12 = sub nsw i32 %11, 1
  %13 = icmp sge i32 %10, %12
  br i1 %13, label %14, label %15

14:                                               ; preds = %4
  br label %33

15:                                               ; preds = %4
  call void @llvm.lifetime.start.p0(i64 4, ptr %9) #2
  %16 = load i32, ptr %6, align 4, !tbaa !9
  %17 = load i32, ptr %7, align 4, !tbaa !9
  %18 = add nsw i32 %16, %17
  %19 = ashr i32 %18, 1
  store i32 %19, ptr %9, align 4, !tbaa !9
  %20 = load ptr, ptr %5, align 8, !tbaa !5
  %21 = load i32, ptr %6, align 4, !tbaa !9
  %22 = load i32, ptr %9, align 4, !tbaa !9
  %23 = load ptr, ptr %8, align 8, !tbaa !5
  call void @_Z9MergeSortRSt6vectorIiSaIiEEiiRi(ptr noundef nonnull align 8 dereferenceable(24) %20, i32 noundef %21, i32 noundef %22, ptr noundef nonnull align 4 dereferenceable(4) %23)
  %24 = load ptr, ptr %5, align 8, !tbaa !5
  %25 = load i32, ptr %9, align 4, !tbaa !9
  %26 = load i32, ptr %7, align 4, !tbaa !9
  %27 = load ptr, ptr %8, align 8, !tbaa !5
  call void @_Z9MergeSortRSt6vectorIiSaIiEEiiRi(ptr noundef nonnull align 8 dereferenceable(24) %24, i32 noundef %25, i32 noundef %26, ptr noundef nonnull align 4 dereferenceable(4) %27)
  %28 = load ptr, ptr %5, align 8, !tbaa !5
  %29 = load i32, ptr %6, align 4, !tbaa !9
  %30 = load i32, ptr %9, align 4, !tbaa !9
  %31 = load i32, ptr %7, align 4, !tbaa !9
  %32 = load ptr, ptr %8, align 8, !tbaa !5
  call void @_Z24MergeWithCountInversionsRSt6vectorIiSaIiEEiiiRi(ptr noundef nonnull align 8 dereferenceable(24) %28, i32 noundef %29, i32 noundef %30, i32 noundef %31, ptr noundef nonnull align 4 dereferenceable(4) %32)
  call void @llvm.lifetime.end.p0(i64 4, ptr %9) #2
  br label %33

33:                                               ; preds = %15, %14
  ret void
}

attributes #0 = { 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 #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++ 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 uwtable
declare dso_local void @_Z24MergeWithCountInversionsRSt6vectorIiSaIiEEiiiRi(ptr noundef nonnull align 8 dereferenceable(24), i32 noundef, i32 noundef, i32 noundef, ptr noundef nonnull align 4 dereferenceable(4)) local_unnamed_addr #0

; Function Attrs: mustprogress uwtable
define dso_local void @_Z9MergeSortRSt6vectorIiSaIiEEiiRi(ptr noundef nonnull align 8 dereferenceable(24) %0, i32 noundef %1, i32 noundef %2, ptr noundef nonnull align 4 dereferenceable(4) %3) local_unnamed_addr #0 {
  %5 = add nsw i32 %2, -1
  %.not = icmp sgt i32 %5, %1
  br i1 %.not, label %6, label %common.ret16

common.ret16:                                     ; preds = %4, %6
  ret void

6:                                                ; preds = %4
  %7 = add nsw i32 %2, %1
  %8 = ashr i32 %7, 1
  tail call void @_Z9MergeSortRSt6vectorIiSaIiEEiiRi(ptr noundef nonnull align 8 dereferenceable(24) %0, i32 noundef %1, i32 noundef %8, ptr noundef nonnull align 4 dereferenceable(4) %3)
  tail call void @_Z9MergeSortRSt6vectorIiSaIiEEiiRi(ptr noundef nonnull align 8 dereferenceable(24) %0, i32 noundef %8, i32 noundef %2, ptr noundef nonnull align 4 dereferenceable(4) %3)
  tail call void @_Z24MergeWithCountInversionsRSt6vectorIiSaIiEEiiiRi(ptr noundef nonnull align 8 dereferenceable(24) %0, i32 noundef %1, i32 noundef %8, i32 noundef %2, ptr noundef nonnull align 4 dereferenceable(4) %3)
  br label %common.ret16
}

attributes #0 = { 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" }

!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: GlobalOptPass,InferFunctionAttrsPass,InstCombinePass,ReassociatePass,SROAPass,SimplifyCFGPass,TailCallElimPass