; LLVM IR from gzc/CLRS :: C07-Quicksort/exercise_code (quickSortWithEqualElements)

; 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
define dso_local void @_ZN9QuickSort10sortHelperEiiRSt6vectorIiSaIiEE(ptr noundef nonnull align 1 dereferenceable(1) %0, i32 noundef %1, i32 noundef %2, ptr noundef nonnull align 8 dereferenceable(24) %3) #0 align 2 {
  %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 ptr, ptr %5, align 8
  %11 = load i32, ptr %6, align 4, !tbaa !9
  %12 = load i32, ptr %7, align 4, !tbaa !9
  %13 = icmp slt i32 %11, %12
  br i1 %13, label %14, label %27

14:                                               ; preds = %4
  call void @llvm.lifetime.start.p0(i64 4, ptr %9) #3
  %15 = load i32, ptr %6, align 4, !tbaa !9
  %16 = load i32, ptr %7, align 4, !tbaa !9
  %17 = load ptr, ptr %8, align 8, !tbaa !5
  %18 = call noundef i32 @_ZN9QuickSort14hoarePartitionEiiRSt6vectorIiSaIiEE(ptr noundef nonnull align 1 dereferenceable(1) %10, i32 noundef %15, i32 noundef %16, ptr noundef nonnull align 8 dereferenceable(24) %17)
  store i32 %18, ptr %9, align 4, !tbaa !9
  %19 = load i32, ptr %6, align 4, !tbaa !9
  %20 = load i32, ptr %9, align 4, !tbaa !9
  %21 = sub nsw i32 %20, 1
  %22 = load ptr, ptr %8, align 8, !tbaa !5
  call void @_ZN9QuickSort10sortHelperEiiRSt6vectorIiSaIiEE(ptr noundef nonnull align 1 dereferenceable(1) %10, i32 noundef %19, i32 noundef %21, ptr noundef nonnull align 8 dereferenceable(24) %22)
  %23 = load i32, ptr %9, align 4, !tbaa !9
  %24 = add nsw i32 %23, 1
  %25 = load i32, ptr %7, align 4, !tbaa !9
  %26 = load ptr, ptr %8, align 8, !tbaa !5
  call void @_ZN9QuickSort10sortHelperEiiRSt6vectorIiSaIiEE(ptr noundef nonnull align 1 dereferenceable(1) %10, i32 noundef %24, i32 noundef %25, ptr noundef nonnull align 8 dereferenceable(24) %26)
  call void @llvm.lifetime.end.p0(i64 4, ptr %9) #3
  br label %27

27:                                               ; preds = %14, %4
  ret void
}

; Function Attrs: nocallback nofree nosync nounwind willreturn memory(argmem: readwrite)
declare void @llvm.lifetime.start.p0(i64 immarg, ptr nocapture) #1

; Function Attrs: mustprogress nounwind uwtable
declare dso_local noundef i32 @_ZN9QuickSort14hoarePartitionEiiRSt6vectorIiSaIiEE(ptr noundef nonnull align 1 dereferenceable(1), i32 noundef, i32 noundef, ptr noundef nonnull align 8 dereferenceable(24)) #2 align 2

; Function Attrs: nocallback nofree nosync nounwind willreturn memory(argmem: readwrite)
declare void @llvm.lifetime.end.p0(i64 immarg, ptr nocapture) #1

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 = { mustprogress 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 #3 = { 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 nounwind uwtable
define dso_local void @_ZN9QuickSort10sortHelperEiiRSt6vectorIiSaIiEE(ptr noundef nonnull align 1 dereferenceable(1) %0, i32 noundef %1, i32 noundef %2, ptr noundef nonnull align 8 dereferenceable(24) %3) local_unnamed_addr #0 align 2 {
  %5 = icmp slt i32 %1, %2
  br i1 %5, label %tailrecurse, label %tailrecurse._crit_edge

tailrecurse:                                      ; preds = %4, %tailrecurse
  %.tr1215 = phi i32 [ %8, %tailrecurse ], [ %1, %4 ]
  %6 = tail call noundef i32 @_ZN9QuickSort14hoarePartitionEiiRSt6vectorIiSaIiEE(ptr noundef nonnull align 1 dereferenceable(1) %0, i32 noundef %.tr1215, i32 noundef %2, ptr noundef nonnull align 8 dereferenceable(24) %3)
  %7 = add nsw i32 %6, -1
  tail call void @_ZN9QuickSort10sortHelperEiiRSt6vectorIiSaIiEE(ptr noundef nonnull align 1 dereferenceable(1) %0, i32 noundef %.tr1215, i32 noundef %7, ptr noundef nonnull align 8 dereferenceable(24) %3)
  %8 = add nsw i32 %6, 1
  %9 = icmp slt i32 %8, %2
  br i1 %9, label %tailrecurse, label %tailrecurse._crit_edge

tailrecurse._crit_edge:                           ; preds = %tailrecurse, %4
  ret void
}

; Function Attrs: mustprogress nounwind uwtable
declare dso_local noundef i32 @_ZN9QuickSort14hoarePartitionEiiRSt6vectorIiSaIiEE(ptr noundef nonnull align 1 dereferenceable(1), i32 noundef, i32 noundef, ptr noundef nonnull align 8 dereferenceable(24)) local_unnamed_addr #0 align 2

attributes #0 = { mustprogress 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: GlobalOptPass,InferFunctionAttrsPass,InstCombinePass,JumpThreadingPass,LoopRotatePass,LoopSimplifyPass,LoopUnrollPass,PostOrderFunctionAttrsPass,SROAPass,SimplifyCFGPass,TailCallElimPass