; 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: nocallback nofree nosync nounwind willreturn memory(argmem: readwrite)
declare void @llvm.lifetime.start.p0(i64 immarg, ptr nocapture) #0

; Function Attrs: nocallback nofree nosync nounwind willreturn memory(argmem: readwrite)
declare void @llvm.lifetime.end.p0(i64 immarg, ptr nocapture) #0

; Function Attrs: mustprogress nounwind uwtable
declare dso_local noundef nonnull align 4 dereferenceable(4) ptr @_ZNSt6vectorIiSaIiEEixEm(ptr noundef nonnull align 8 dereferenceable(24), i64 noundef) #1 align 2

; Function Attrs: mustprogress nounwind uwtable
define dso_local noundef zeroext i1 @_ZN9QuickSort8isSortedEiiRSt6vectorIiSaIiEE(ptr noundef nonnull align 1 dereferenceable(1) %0, i32 noundef %1, i32 noundef %2, ptr noundef nonnull align 8 dereferenceable(24) %3) #1 align 2 {
  %5 = alloca i1, align 1
  %6 = alloca ptr, align 8
  %7 = alloca i32, align 4
  %8 = alloca i32, align 4
  %9 = alloca ptr, align 8
  %10 = alloca i32, align 4
  %11 = alloca i32, align 4
  store ptr %0, ptr %6, align 8, !tbaa !5
  store i32 %1, ptr %7, align 4, !tbaa !9
  store i32 %2, ptr %8, align 4, !tbaa !9
  store ptr %3, ptr %9, align 8, !tbaa !5
  %12 = load ptr, ptr %6, align 8
  call void @llvm.lifetime.start.p0(i64 4, ptr %10) #2
  %13 = load i32, ptr %7, align 4, !tbaa !9
  %14 = add nsw i32 %13, 1
  store i32 %14, ptr %10, align 4, !tbaa !9
  br label %15

15:                                               ; preds = %35, %4
  %16 = load i32, ptr %10, align 4, !tbaa !9
  %17 = load i32, ptr %8, align 4, !tbaa !9
  %18 = icmp sle i32 %16, %17
  br i1 %18, label %20, label %19

19:                                               ; preds = %15
  store i32 2, ptr %11, align 4
  br label %38

20:                                               ; preds = %15
  %21 = load ptr, ptr %9, align 8, !tbaa !5
  %22 = load i32, ptr %10, align 4, !tbaa !9
  %23 = sext i32 %22 to i64
  %24 = call noundef nonnull align 4 dereferenceable(4) ptr @_ZNSt6vectorIiSaIiEEixEm(ptr noundef nonnull align 8 dereferenceable(24) %21, i64 noundef %23) #2
  %25 = load i32, ptr %24, align 4, !tbaa !9
  %26 = load ptr, ptr %9, align 8, !tbaa !5
  %27 = load i32, ptr %10, align 4, !tbaa !9
  %28 = sub nsw i32 %27, 1
  %29 = sext i32 %28 to i64
  %30 = call noundef nonnull align 4 dereferenceable(4) ptr @_ZNSt6vectorIiSaIiEEixEm(ptr noundef nonnull align 8 dereferenceable(24) %26, i64 noundef %29) #2
  %31 = load i32, ptr %30, align 4, !tbaa !9
  %32 = icmp slt i32 %25, %31
  br i1 %32, label %33, label %34

33:                                               ; preds = %20
  store i1 false, ptr %5, align 1
  store i32 1, ptr %11, align 4
  br label %38

34:                                               ; preds = %20
  br label %35

35:                                               ; preds = %34
  %36 = load i32, ptr %10, align 4, !tbaa !9
  %37 = add nsw i32 %36, 1
  store i32 %37, ptr %10, align 4, !tbaa !9
  br label %15, !llvm.loop !11

38:                                               ; preds = %33, %19
  call void @llvm.lifetime.end.p0(i64 4, ptr %10) #2
  %39 = load i32, ptr %11, align 4
  switch i32 %39, label %43 [
    i32 2, label %40
    i32 1, label %41
  ]

40:                                               ; preds = %38
  store i1 true, ptr %5, align 1
  br label %41

41:                                               ; preds = %40, %38
  %42 = load i1, ptr %5, align 1
  ret i1 %42

43:                                               ; preds = %38
  unreachable
}

attributes #0 = { nocallback nofree nosync nounwind willreturn memory(argmem: readwrite) }
attributes #1 = { 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 #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}
!11 = distinct !{!11, !12}
!12 = !{!"llvm.loop.mustprogress"}


; 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
declare dso_local noundef nonnull align 4 dereferenceable(4) ptr @_ZNSt6vectorIiSaIiEEixEm(ptr noundef nonnull align 8 dereferenceable(24), i64 noundef) local_unnamed_addr #0 align 2

; Function Attrs: mustprogress nounwind uwtable
define dso_local noundef zeroext i1 @_ZN9QuickSort8isSortedEiiRSt6vectorIiSaIiEE(ptr nocapture noundef nonnull readnone 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 = sext i32 %1 to i64
  %smax = tail call i32 @llvm.smax.i32(i32 %2, i32 %1)
  %wide.trip.count = sext i32 %smax to i64
  br label %6

6:                                                ; preds = %7, %4
  %indvars.iv = phi i64 [ %indvars.iv.next, %7 ], [ %5, %4 ]
  %exitcond = icmp eq i64 %indvars.iv, %wide.trip.count
  br i1 %exitcond, label %13, label %7

7:                                                ; preds = %6
  %indvars.iv.next = add nsw i64 %indvars.iv, 1
  %8 = tail call noundef nonnull align 4 dereferenceable(4) ptr @_ZNSt6vectorIiSaIiEEixEm(ptr noundef nonnull align 8 dereferenceable(24) %3, i64 noundef %indvars.iv.next) #2
  %9 = load i32, ptr %8, align 4, !tbaa !5
  %10 = tail call noundef nonnull align 4 dereferenceable(4) ptr @_ZNSt6vectorIiSaIiEEixEm(ptr noundef nonnull align 8 dereferenceable(24) %3, i64 noundef %indvars.iv) #2
  %11 = load i32, ptr %10, align 4, !tbaa !5
  %12 = icmp slt i32 %9, %11
  br i1 %12, label %13, label %6, !llvm.loop !9

13:                                               ; preds = %7, %6
  %14 = sext i32 %2 to i64
  %.not.not = icmp sge i64 %indvars.iv, %14
  ret i1 %.not.not
}

; Function Attrs: nocallback nofree nosync nounwind speculatable willreturn memory(none)
declare i32 @llvm.smax.i32(i32, i32) #1

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" }
attributes #1 = { nocallback nofree nosync nounwind speculatable willreturn memory(none) }
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 = !{!"int", !7, i64 0}
!7 = !{!"omnipotent char", !8, i64 0}
!8 = !{!"Simple C++ TBAA"}
!9 = distinct !{!9, !10}
!10 = !{!"llvm.loop.mustprogress"}


; Effective O3 passes: CorrelatedValuePropagationPass,EarlyCSEPass,GVNPass,GlobalOptPass,IPSCCPPass,IndVarSimplifyPass,InferFunctionAttrsPass,InstCombinePass,InstSimplifyPass,LCSSAPass,LoopUnrollPass,PostOrderFunctionAttrsPass,SROAPass,SimplifyCFGPass,TailCallElimPass