; LLVM IR from Deborah-Digges/mark-sweep-simulation :: 01-marksweep-simple/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.VM = type <{ %"class.std::deque", ptr, %"class.std::queue", i32, i32, i32, [4 x i8] }>
%"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.std::queue" = type { %"class.std::deque" }

; 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 {
  %2 = alloca ptr, align 8
  %3 = alloca i32, align 4
  store ptr %0, ptr %2, align 8, !tbaa !5
  %4 = load ptr, ptr %2, align 8
  call void @llvm.lifetime.start.p0(i64 4, ptr %3) #3
  store i32 0, ptr %3, align 4, !tbaa !9
  br label %5

5:                                                ; preds = %18, %1
  %6 = load i32, ptr %3, align 4, !tbaa !9
  %7 = sext i32 %6 to i64
  %8 = getelementptr inbounds %class.VM, ptr %4, i32 0, i32 0
  %9 = call noundef i64 @_ZNKSt5dequeIP6ObjectSaIS1_EE4sizeEv(ptr noundef nonnull align 8 dereferenceable(80) %8) #3
  %10 = icmp ult i64 %7, %9
  br i1 %10, label %12, label %11

11:                                               ; preds = %5
  call void @llvm.lifetime.end.p0(i64 4, ptr %3) #3
  br label %21

12:                                               ; preds = %5
  %13 = getelementptr inbounds %class.VM, ptr %4, i32 0, i32 0
  %14 = load i32, ptr %3, align 4, !tbaa !9
  %15 = sext i32 %14 to i64
  %16 = call noundef nonnull align 8 dereferenceable(8) ptr @_ZNSt5dequeIP6ObjectSaIS1_EE2atEm(ptr noundef nonnull align 8 dereferenceable(80) %13, i64 noundef %15)
  %17 = load ptr, ptr %16, align 8, !tbaa !5
  call void @_ZN2VM4markEP6Object(ptr noundef nonnull align 8 dereferenceable(180) %4, ptr noundef %17)
  br label %18

18:                                               ; preds = %12
  %19 = load i32, ptr %3, align 4, !tbaa !9
  %20 = add nsw i32 %19, 1
  store i32 %20, ptr %3, align 4, !tbaa !9
  br label %5, !llvm.loop !11

21:                                               ; preds = %11
  ret void
}

; Function Attrs: mustprogress uwtable
declare dso_local void @_ZN2VM4markEP6Object(ptr noundef nonnull align 8 dereferenceable(180), ptr noundef) #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

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 = { 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 i64 @_ZNKSt5dequeIP6ObjectSaIS1_EE4sizeEv(ptr noundef nonnull align 8 dereferenceable(80)) local_unnamed_addr #0 align 2

; Function Attrs: mustprogress uwtable
define dso_local void @_ZN2VM7markAllEv(ptr noundef nonnull align 8 dereferenceable(180) %0) local_unnamed_addr #1 align 2 {
  %2 = tail call noundef i64 @_ZNKSt5dequeIP6ObjectSaIS1_EE4sizeEv(ptr noundef nonnull align 8 dereferenceable(80) %0) #2
  %.not = icmp eq i64 %2, 0
  br i1 %.not, label %._crit_edge, label %.lr.ph

._crit_edge:                                      ; preds = %.lr.ph, %1
  ret void

.lr.ph:                                           ; preds = %1, %.lr.ph
  %indvars.iv = phi i64 [ %indvars.iv.next, %.lr.ph ], [ 0, %1 ]
  %3 = tail call noundef nonnull align 8 dereferenceable(8) ptr @_ZNSt5dequeIP6ObjectSaIS1_EE2atEm(ptr noundef nonnull align 8 dereferenceable(80) %0, i64 noundef %indvars.iv)
  %4 = load ptr, ptr %3, align 8, !tbaa !5
  tail call void @_ZN2VM4markEP6Object(ptr noundef nonnull align 8 dereferenceable(180) %0, ptr noundef %4)
  %indvars.iv.next = add nuw nsw i64 %indvars.iv, 1
  %5 = tail call noundef i64 @_ZNKSt5dequeIP6ObjectSaIS1_EE4sizeEv(ptr noundef nonnull align 8 dereferenceable(80) %0) #2
  %6 = icmp ugt i64 %5, %indvars.iv.next
  br i1 %6, label %.lr.ph, label %._crit_edge, !llvm.loop !9
}

; Function Attrs: mustprogress uwtable
declare dso_local void @_ZN2VM4markEP6Object(ptr noundef nonnull align 8 dereferenceable(180), ptr noundef) local_unnamed_addr #1 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 #1 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" }
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 = { 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 = distinct !{!9, !10}
!10 = !{!"llvm.loop.mustprogress"}


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