; LLVM IR from Deborah-Digges/mark-sweep-simulation :: 02-marksweep-Explicit-Stack/vm.ll (ZN2VM7markAllEv)

; 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.std::stack" = type { %"class.std::deque" }
%"class.std::deque" = type { %"class.std::_Deque_base" }
%"class.std::_Deque_base" = type { %"struct.std::_Deque_base<Object *, std::allocator<Object *>>::_Deque_impl" }
%"struct.std::_Deque_base<Object *, std::allocator<Object *>>::_Deque_impl" = type { %"struct.std::_Deque_base<Object *, std::allocator<Object *>>::_Deque_impl_data" }
%"struct.std::_Deque_base<Object *, std::allocator<Object *>>::_Deque_impl_data" = type { ptr, i64, %"struct.std::_Deque_iterator", %"struct.std::_Deque_iterator" }
%"struct.std::_Deque_iterator" = type { ptr, ptr, ptr, ptr }
%class.VM = type <{ %"class.std::deque", ptr, %"class.std::queue", i32, i32, i32, [4 x i8] }>
%"class.std::queue" = type { %"class.std::deque" }
%struct.Object = type { i32, i32, ptr, %union.anon }
%union.anon = type { %struct.anon }
%struct.anon = type { ptr, ptr }

declare i32 @__gxx_personality_v0(...)

; 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 i64 @_ZNKSt5dequeIP6ObjectSaIS1_EE4sizeEv(ptr noundef nonnull align 8 dereferenceable(80)) #1 align 2

; Function Attrs: mustprogress uwtable
define dso_local void @_ZN2VM7markAllEv(ptr noundef nonnull align 8 dereferenceable(180) %0) #2 align 2 personality ptr @__gxx_personality_v0 {
  %2 = alloca ptr, align 8
  %3 = alloca %"class.std::stack", align 8
  %4 = alloca i32, align 4
  %5 = alloca ptr, align 8
  %6 = alloca ptr, align 8
  %7 = alloca i32, align 4
  store ptr %0, ptr %2, align 8, !tbaa !5
  %8 = load ptr, ptr %2, align 8
  call void @llvm.lifetime.start.p0(i64 80, ptr %3) #4
  call void @_ZNSt5stackIP6ObjectSt5dequeIS1_SaIS1_EEEC2IS4_vEEv(ptr noundef nonnull align 8 dereferenceable(80) %3)
  call void @llvm.lifetime.start.p0(i64 4, ptr %4) #4
  store i32 0, ptr %4, align 4, !tbaa !9
  br label %9

9:                                                ; preds = %37, %1
  %10 = load i32, ptr %4, align 4, !tbaa !9
  %11 = sext i32 %10 to i64
  %12 = getelementptr inbounds %class.VM, ptr %8, i32 0, i32 0
  %13 = call noundef i64 @_ZNKSt5dequeIP6ObjectSaIS1_EE4sizeEv(ptr noundef nonnull align 8 dereferenceable(80) %12) #4
  %14 = icmp ult i64 %11, %13
  br i1 %14, label %16, label %15

15:                                               ; preds = %9
  call void @llvm.lifetime.end.p0(i64 4, ptr %4) #4
  br label %40

16:                                               ; preds = %9
  call void @llvm.lifetime.start.p0(i64 8, ptr %5) #4
  %17 = getelementptr inbounds %class.VM, ptr %8, i32 0, i32 0
  %18 = load i32, ptr %4, align 4, !tbaa !9
  %19 = sext i32 %18 to i64
  %20 = invoke noundef nonnull align 8 dereferenceable(8) ptr @_ZNSt5dequeIP6ObjectSaIS1_EE2atEm(ptr noundef nonnull align 8 dereferenceable(80) %17, i64 noundef %19)
          to label %21 unwind label %32

21:                                               ; preds = %16
  %22 = load ptr, ptr %20, align 8, !tbaa !5
  store ptr %22, ptr %5, align 8, !tbaa !5
  %23 = load ptr, ptr %5, align 8, !tbaa !5
  %24 = getelementptr inbounds %struct.Object, ptr %23, i32 0, i32 1
  store i32 1, ptr %24, align 4, !tbaa !11
  %25 = load ptr, ptr %5, align 8, !tbaa !5
  %26 = getelementptr inbounds %struct.Object, ptr %25, i32 0, i32 0
  %27 = load i32, ptr %26, align 8, !tbaa !14
  %28 = icmp eq i32 %27, 1
  br i1 %28, label %29, label %36

29:                                               ; preds = %21
  invoke void @_ZNSt5stackIP6ObjectSt5dequeIS1_SaIS1_EEE4pushERKS1_(ptr noundef nonnull align 8 dereferenceable(80) %3, ptr noundef nonnull align 8 dereferenceable(8) %5)
          to label %30 unwind label %32

30:                                               ; preds = %29
  invoke void @_ZN2VM4markERSt5stackIP6ObjectSt5dequeIS2_SaIS2_EEE(ptr noundef nonnull align 8 dereferenceable(180) %8, ptr noundef nonnull align 8 dereferenceable(80) %3)
          to label %31 unwind label %32

31:                                               ; preds = %30
  br label %36

32:                                               ; preds = %30, %29, %16
  %33 = landingpad { ptr, i32 }
          cleanup
  %34 = extractvalue { ptr, i32 } %33, 0
  store ptr %34, ptr %6, align 8
  %35 = extractvalue { ptr, i32 } %33, 1
  store i32 %35, ptr %7, align 4
  call void @llvm.lifetime.end.p0(i64 8, ptr %5) #4
  call void @llvm.lifetime.end.p0(i64 4, ptr %4) #4
  call void @_ZNSt5stackIP6ObjectSt5dequeIS1_SaIS1_EEED2Ev(ptr noundef nonnull align 8 dereferenceable(80) %3) #4
  call void @llvm.lifetime.end.p0(i64 80, ptr %3) #4
  br label %41

36:                                               ; preds = %31, %21
  call void @llvm.lifetime.end.p0(i64 8, ptr %5) #4
  br label %37

37:                                               ; preds = %36
  %38 = load i32, ptr %4, align 4, !tbaa !9
  %39 = add nsw i32 %38, 1
  store i32 %39, ptr %4, align 4, !tbaa !9
  br label %9, !llvm.loop !15

40:                                               ; preds = %15
  call void @_ZNSt5stackIP6ObjectSt5dequeIS1_SaIS1_EEED2Ev(ptr noundef nonnull align 8 dereferenceable(80) %3) #4
  call void @llvm.lifetime.end.p0(i64 80, ptr %3) #4
  ret void

41:                                               ; preds = %32
  %42 = load ptr, ptr %6, align 8
  %43 = load i32, ptr %7, align 4
  %44 = insertvalue { ptr, i32 } poison, ptr %42, 0
  %45 = insertvalue { ptr, i32 } %44, i32 %43, 1
  resume { ptr, i32 } %45
}

; Function Attrs: mustprogress uwtable
declare dso_local void @_ZNSt5stackIP6ObjectSt5dequeIS1_SaIS1_EEEC2IS4_vEEv(ptr noundef nonnull align 8 dereferenceable(80)) unnamed_addr #2 align 2

; Function Attrs: mustprogress uwtable
declare dso_local noundef nonnull align 8 dereferenceable(8) ptr @_ZNSt5dequeIP6ObjectSaIS1_EE2atEm(ptr noundef nonnull align 8 dereferenceable(80), i64 noundef) #2 align 2

; Function Attrs: mustprogress uwtable
declare dso_local void @_ZNSt5stackIP6ObjectSt5dequeIS1_SaIS1_EEE4pushERKS1_(ptr noundef nonnull align 8 dereferenceable(80), ptr noundef nonnull align 8 dereferenceable(8)) #2 align 2

; Function Attrs: mustprogress uwtable
declare dso_local void @_ZN2VM4markERSt5stackIP6ObjectSt5dequeIS2_SaIS2_EEE(ptr noundef nonnull align 8 dereferenceable(180), ptr noundef nonnull align 8 dereferenceable(80)) #2 align 2

; Function Attrs: inlinehint mustprogress nounwind uwtable
declare dso_local void @_ZNSt5stackIP6ObjectSt5dequeIS1_SaIS1_EEED2Ev(ptr noundef nonnull align 8 dereferenceable(80)) unnamed_addr #3 align 2

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 = { 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 = { 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 #4 = { 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 = !{!12, !10, i64 4}
!12 = !{!"_ZTS6Object", !13, i64 0, !10, i64 4, !6, i64 8, !7, i64 16}
!13 = !{!"_ZTS10ObjectType", !7, i64 0}
!14 = !{!12, !13, i64 0}
!15 = distinct !{!15, !16}
!16 = !{!"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.std::stack" = type { %"class.std::deque" }
%"class.std::deque" = type { %"class.std::_Deque_base" }
%"class.std::_Deque_base" = type { %"struct.std::_Deque_base<Object *, std::allocator<Object *>>::_Deque_impl" }
%"struct.std::_Deque_base<Object *, std::allocator<Object *>>::_Deque_impl" = type { %"struct.std::_Deque_base<Object *, std::allocator<Object *>>::_Deque_impl_data" }
%"struct.std::_Deque_base<Object *, std::allocator<Object *>>::_Deque_impl_data" = type { ptr, i64, %"struct.std::_Deque_iterator", %"struct.std::_Deque_iterator" }
%"struct.std::_Deque_iterator" = type { ptr, ptr, ptr, ptr }

declare i32 @__gxx_personality_v0(...)

; 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 nounwind uwtable
declare dso_local noundef i64 @_ZNKSt5dequeIP6ObjectSaIS1_EE4sizeEv(ptr noundef nonnull align 8 dereferenceable(80)) local_unnamed_addr #1 align 2

; Function Attrs: mustprogress uwtable
define dso_local void @_ZN2VM7markAllEv(ptr noundef nonnull align 8 dereferenceable(180) %0) local_unnamed_addr #2 align 2 personality ptr @__gxx_personality_v0 {
  %2 = alloca %"class.std::stack", align 8
  %3 = alloca ptr, align 8
  call void @llvm.lifetime.start.p0(i64 80, ptr nonnull %2) #4
  call void @_ZNSt5stackIP6ObjectSt5dequeIS1_SaIS1_EEEC2IS4_vEEv(ptr noundef nonnull align 8 dereferenceable(80) %2)
  %4 = call noundef i64 @_ZNKSt5dequeIP6ObjectSaIS1_EE4sizeEv(ptr noundef nonnull align 8 dereferenceable(80) %0) #4
  %.not = icmp eq i64 %4, 0
  br i1 %.not, label %._crit_edge, label %.lr.ph

._crit_edge:                                      ; preds = %15, %1
  call void @_ZNSt5stackIP6ObjectSt5dequeIS1_SaIS1_EEED2Ev(ptr noundef nonnull align 8 dereferenceable(80) %2) #4
  call void @llvm.lifetime.end.p0(i64 80, ptr nonnull %2) #4
  ret void

.lr.ph:                                           ; preds = %1, %15
  %indvars.iv = phi i64 [ %indvars.iv.next, %15 ], [ 0, %1 ]
  call void @llvm.lifetime.start.p0(i64 8, ptr nonnull %3) #4
  %5 = invoke noundef nonnull align 8 dereferenceable(8) ptr @_ZNSt5dequeIP6ObjectSaIS1_EE2atEm(ptr noundef nonnull align 8 dereferenceable(80) %0, i64 noundef %indvars.iv)
          to label %6 unwind label %13

6:                                                ; preds = %.lr.ph
  %7 = load ptr, ptr %5, align 8, !tbaa !5
  store ptr %7, ptr %3, align 8, !tbaa !5
  %8 = getelementptr inbounds i8, ptr %7, i64 4
  store i32 1, ptr %8, align 4, !tbaa !9
  %9 = load i32, ptr %7, align 8, !tbaa !13
  %10 = icmp eq i32 %9, 1
  br i1 %10, label %11, label %15

11:                                               ; preds = %6
  invoke void @_ZNSt5stackIP6ObjectSt5dequeIS1_SaIS1_EEE4pushERKS1_(ptr noundef nonnull align 8 dereferenceable(80) %2, ptr noundef nonnull align 8 dereferenceable(8) %3)
          to label %12 unwind label %13

12:                                               ; preds = %11
  invoke void @_ZN2VM4markERSt5stackIP6ObjectSt5dequeIS2_SaIS2_EEE(ptr noundef nonnull align 8 dereferenceable(180) %0, ptr noundef nonnull align 8 dereferenceable(80) %2)
          to label %15 unwind label %13

13:                                               ; preds = %12, %11, %.lr.ph
  %14 = landingpad { ptr, i32 }
          cleanup
  call void @llvm.lifetime.end.p0(i64 8, ptr nonnull %3) #4
  call void @_ZNSt5stackIP6ObjectSt5dequeIS1_SaIS1_EEED2Ev(ptr noundef nonnull align 8 dereferenceable(80) %2) #4
  call void @llvm.lifetime.end.p0(i64 80, ptr nonnull %2) #4
  resume { ptr, i32 } %14

15:                                               ; preds = %12, %6
  call void @llvm.lifetime.end.p0(i64 8, ptr nonnull %3) #4
  %indvars.iv.next = add nuw nsw i64 %indvars.iv, 1
  %16 = call noundef i64 @_ZNKSt5dequeIP6ObjectSaIS1_EE4sizeEv(ptr noundef nonnull align 8 dereferenceable(80) %0) #4
  %17 = icmp ugt i64 %16, %indvars.iv.next
  br i1 %17, label %.lr.ph, label %._crit_edge, !llvm.loop !14
}

; Function Attrs: mustprogress uwtable
declare dso_local void @_ZNSt5stackIP6ObjectSt5dequeIS1_SaIS1_EEEC2IS4_vEEv(ptr noundef nonnull align 8 dereferenceable(80)) unnamed_addr #2 align 2

; Function Attrs: mustprogress uwtable
declare dso_local noundef nonnull align 8 dereferenceable(8) ptr @_ZNSt5dequeIP6ObjectSaIS1_EE2atEm(ptr noundef nonnull align 8 dereferenceable(80), i64 noundef) local_unnamed_addr #2 align 2

; Function Attrs: mustprogress uwtable
declare dso_local void @_ZNSt5stackIP6ObjectSt5dequeIS1_SaIS1_EEE4pushERKS1_(ptr noundef nonnull align 8 dereferenceable(80), ptr noundef nonnull align 8 dereferenceable(8)) local_unnamed_addr #2 align 2

; Function Attrs: mustprogress uwtable
declare dso_local void @_ZN2VM4markERSt5stackIP6ObjectSt5dequeIS2_SaIS2_EEE(ptr noundef nonnull align 8 dereferenceable(180), ptr noundef nonnull align 8 dereferenceable(80)) local_unnamed_addr #2 align 2

; Function Attrs: inlinehint mustprogress nounwind uwtable
declare dso_local void @_ZNSt5stackIP6ObjectSt5dequeIS1_SaIS1_EEED2Ev(ptr noundef nonnull align 8 dereferenceable(80)) unnamed_addr #3 align 2

attributes #0 = { mustprogress 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 = { 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 = { 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 #4 = { 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, !12, i64 4}
!10 = !{!"_ZTS6Object", !11, i64 0, !12, i64 4, !6, i64 8, !7, i64 16}
!11 = !{!"_ZTS10ObjectType", !7, i64 0}
!12 = !{!"int", !7, i64 0}
!13 = !{!10, !11, i64 0}
!14 = distinct !{!14, !15}
!15 = !{!"llvm.loop.mustprogress"}


; Effective O3 passes: EarlyCSEPass,GlobalOptPass,IndVarSimplifyPass,InferFunctionAttrsPass,InstCombinePass,JumpThreadingPass,LoopRotatePass,LoopSimplifyPass,LoopUnrollPass,SROAPass,SimplifyCFGPass