; LLVM IR from stan-dev/math :: lib/tbb_2020.3/src/test/test_malloc_shutdown_hang.ll (Z20hangOnExitReproducerv)

; 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"

%"class.tbb::internal::allocate_root_proxy" = type { i8 }

; 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: nocallback nofree nounwind willreturn memory(argmem: write)
declare void @llvm.memset.p0.i64(ptr nocapture writeonly, i8, i64, i1 immarg) #1

; Function Attrs: mustprogress uwtable
define dso_local void @_Z20hangOnExitReproducerv() #2 personality ptr @__gxx_personality_v0 {
  %1 = alloca i32, align 4
  %2 = alloca i32, align 4
  %3 = alloca %"class.tbb::internal::allocate_root_proxy", align 1
  %4 = alloca %"class.tbb::internal::allocate_root_proxy", align 1
  %5 = alloca ptr, align 8
  %6 = alloca i32, align 4
  call void @llvm.lifetime.start.p0(i64 4, ptr %1) #7
  %7 = call noundef i32 @_ZN3tbb19task_scheduler_init19default_num_threadsEv()
  store i32 %7, ptr %1, align 4, !tbaa !5
  call void @llvm.lifetime.start.p0(i64 4, ptr %2) #7
  store i32 0, ptr %2, align 4, !tbaa !5
  br label %8

8:                                                ; preds = %17, %0
  %9 = load i32, ptr %2, align 4, !tbaa !5
  %10 = load i32, ptr %1, align 4, !tbaa !5
  %11 = sub nsw i32 %10, 1
  %12 = icmp slt i32 %9, %11
  br i1 %12, label %14, label %13

13:                                               ; preds = %8
  call void @llvm.lifetime.end.p0(i64 4, ptr %2) #7
  br label %24

14:                                               ; preds = %8
  call void @llvm.lifetime.start.p0(i64 1, ptr %3) #7
  call void @_ZN3tbb4task13allocate_rootEv()
  %15 = call noundef ptr @_ZnwmRKN3tbb8internal19allocate_root_proxyE(i64 noundef 8, ptr noundef nonnull align 1 dereferenceable(1) %3)
  call void @llvm.memset.p0.i64(ptr align 8 %15, i8 0, i64 8, i1 false)
  invoke void @_ZN19AllocatorThrashTaskC2Ev(ptr noundef nonnull align 8 dereferenceable(8) %15)
          to label %16 unwind label %20

16:                                               ; preds = %14
  call void @_ZN3tbb4task7enqueueERS0_(ptr noundef nonnull align 8 dereferenceable(8) %15)
  call void @llvm.lifetime.end.p0(i64 1, ptr %3) #7
  br label %17

17:                                               ; preds = %16
  %18 = load i32, ptr %2, align 4, !tbaa !5
  %19 = add nsw i32 %18, 1
  store i32 %19, ptr %2, align 4, !tbaa !5
  br label %8, !llvm.loop !9

20:                                               ; preds = %14
  %21 = landingpad { ptr, i32 }
          cleanup
  %22 = extractvalue { ptr, i32 } %21, 0
  store ptr %22, ptr %5, align 8
  %23 = extractvalue { ptr, i32 } %21, 1
  store i32 %23, ptr %6, align 4
  call void @_ZdlPvRKN3tbb8internal19allocate_root_proxyE(ptr noundef %15, ptr noundef nonnull align 1 dereferenceable(1) %3) #7
  call void @llvm.lifetime.end.p0(i64 1, ptr %3) #7
  call void @llvm.lifetime.end.p0(i64 4, ptr %2) #7
  call void @llvm.lifetime.end.p0(i64 4, ptr %1) #7
  br label %25

24:                                               ; preds = %13
  call void @llvm.lifetime.end.p0(i64 4, ptr %1) #7
  ret void

25:                                               ; preds = %20
  %26 = load ptr, ptr %5, align 8
  %27 = load i32, ptr %6, align 4
  %28 = insertvalue { ptr, i32 } poison, ptr %26, 0
  %29 = insertvalue { ptr, i32 } %28, i32 %27, 1
  resume { ptr, i32 } %29
}

declare noundef i32 @_ZN3tbb19task_scheduler_init19default_num_threadsEv() #3

; Function Attrs: mustprogress uwtable
declare dso_local void @_ZN3tbb4task7enqueueERS0_(ptr noundef nonnull align 8 dereferenceable(8)) #2 align 2

; Function Attrs: mustprogress nounwind uwtable
declare dso_local void @_ZN3tbb4task13allocate_rootEv() #4 align 2

; Function Attrs: inlinehint mustprogress uwtable
declare dso_local noundef ptr @_ZnwmRKN3tbb8internal19allocate_root_proxyE(i64 noundef, ptr noundef nonnull align 1 dereferenceable(1)) #5

; Function Attrs: inlinehint mustprogress uwtable
declare dso_local void @_ZN19AllocatorThrashTaskC2Ev(ptr noundef nonnull align 8 dereferenceable(8)) unnamed_addr #5 align 2

declare i32 @__gxx_personality_v0(...)

; Function Attrs: inlinehint mustprogress nounwind uwtable
declare dso_local void @_ZdlPvRKN3tbb8internal19allocate_root_proxyE(ptr noundef, ptr noundef nonnull align 1 dereferenceable(1)) #6

attributes #0 = { nocallback nofree nosync nounwind willreturn memory(argmem: readwrite) }
attributes #1 = { nocallback nofree nounwind willreturn memory(argmem: write) }
attributes #2 = { 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 #3 = { "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 #4 = { 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 #5 = { inlinehint 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 #6 = { inlinehint 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 #7 = { 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"}


; 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"

%"class.tbb::internal::allocate_root_proxy" = type { i8 }

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

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

; Function Attrs: mustprogress uwtable
define dso_local void @_Z20hangOnExitReproducerv() local_unnamed_addr #1 personality ptr @__gxx_personality_v0 {
  %1 = alloca %"class.tbb::internal::allocate_root_proxy", align 1
  %2 = tail call noundef i32 @_ZN3tbb19task_scheduler_init19default_num_threadsEv()
  %3 = icmp sgt i32 %2, 1
  br i1 %3, label %.lr.ph.preheader, label %._crit_edge

.lr.ph.preheader:                                 ; preds = %0
  %4 = add nsw i32 %2, -2
  br label %.lr.ph

._crit_edge:                                      ; preds = %6, %0
  ret void

.lr.ph:                                           ; preds = %.lr.ph.preheader, %6
  %.04 = phi i32 [ %7, %6 ], [ 0, %.lr.ph.preheader ]
  call void @llvm.lifetime.start.p0(i64 1, ptr nonnull %1) #6
  call void @_ZN3tbb4task13allocate_rootEv()
  %5 = call noundef ptr @_ZnwmRKN3tbb8internal19allocate_root_proxyE(i64 noundef 8, ptr noundef nonnull align 1 dereferenceable(1) %1)
  store i64 0, ptr %5, align 8
  invoke void @_ZN19AllocatorThrashTaskC2Ev(ptr noundef nonnull align 8 dereferenceable(8) %5)
          to label %6 unwind label %8

6:                                                ; preds = %.lr.ph
  call void @_ZN3tbb4task7enqueueERS0_(ptr noundef nonnull align 8 dereferenceable(8) %5)
  call void @llvm.lifetime.end.p0(i64 1, ptr nonnull %1) #6
  %7 = add nuw nsw i32 %.04, 1
  %exitcond.not = icmp eq i32 %.04, %4
  br i1 %exitcond.not, label %._crit_edge, label %.lr.ph, !llvm.loop !5

8:                                                ; preds = %.lr.ph
  %9 = landingpad { ptr, i32 }
          cleanup
  call void @_ZdlPvRKN3tbb8internal19allocate_root_proxyE(ptr noundef nonnull %5, ptr noundef nonnull align 1 dereferenceable(1) %1) #6
  call void @llvm.lifetime.end.p0(i64 1, ptr nonnull %1) #6
  resume { ptr, i32 } %9
}

declare noundef i32 @_ZN3tbb19task_scheduler_init19default_num_threadsEv() local_unnamed_addr #2

; Function Attrs: mustprogress uwtable
declare dso_local void @_ZN3tbb4task7enqueueERS0_(ptr noundef nonnull align 8 dereferenceable(8)) local_unnamed_addr #1 align 2

; Function Attrs: mustprogress nounwind uwtable
declare dso_local void @_ZN3tbb4task13allocate_rootEv() local_unnamed_addr #3 align 2

; Function Attrs: inlinehint mustprogress uwtable
declare dso_local noundef ptr @_ZnwmRKN3tbb8internal19allocate_root_proxyE(i64 noundef, ptr noundef nonnull align 1 dereferenceable(1)) local_unnamed_addr #4

; Function Attrs: inlinehint mustprogress uwtable
declare dso_local void @_ZN19AllocatorThrashTaskC2Ev(ptr noundef nonnull align 8 dereferenceable(8)) unnamed_addr #4 align 2

declare i32 @__gxx_personality_v0(...)

; Function Attrs: inlinehint mustprogress nounwind uwtable
declare dso_local void @_ZdlPvRKN3tbb8internal19allocate_root_proxyE(ptr noundef, ptr noundef nonnull align 1 dereferenceable(1)) local_unnamed_addr #5

attributes #0 = { mustprogress nocallback nofree nosync nounwind willreturn memory(argmem: readwrite) }
attributes #1 = { 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 #2 = { "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 = { 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 #4 = { inlinehint 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 #5 = { inlinehint 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 #6 = { 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 = distinct !{!5, !6}
!6 = !{!"llvm.loop.mustprogress"}


; Effective O3 passes: EarlyCSEPass,GVNPass,GlobalOptPass,IndVarSimplifyPass,InferFunctionAttrsPass,InstCombinePass,InstSimplifyPass,JumpThreadingPass,LCSSAPass,LICMPass,LoopRotatePass,LoopSimplifyPass,LoopUnrollPass,SROAPass,SimplifyCFGPass,TailCallElimPass