; LLVM IR from Deborah-Digges/mark-sweep-simulation :: 01-marksweep-simple/vm.ll (ZN2VM15destroyFreeListEv)

; 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: mustprogress uwtable
define dso_local void @_ZN2VM15destroyFreeListEv(ptr noundef nonnull align 8 dereferenceable(180) %0) #0 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) #4
  store i32 0, ptr %3, align 4, !tbaa !9
  br label %5

5:                                                ; preds = %16, %1
  %6 = load i32, ptr %3, align 4, !tbaa !9
  %7 = getelementptr inbounds %class.VM, ptr %4, i32 0, i32 5
  %8 = load i32, ptr %7, align 8, !tbaa !11
  %9 = icmp slt i32 %6, %8
  br i1 %9, label %11, label %10

10:                                               ; preds = %5
  call void @llvm.lifetime.end.p0(i64 4, ptr %3) #4
  br label %19

11:                                               ; preds = %5
  %12 = getelementptr inbounds %class.VM, ptr %4, i32 0, i32 2
  %13 = call noundef nonnull align 8 dereferenceable(8) ptr @_ZNSt5queueIP6ObjectSt5dequeIS1_SaIS1_EEE5frontEv(ptr noundef nonnull align 8 dereferenceable(80) %12)
  %14 = load ptr, ptr %13, align 8, !tbaa !5
  call void @free(ptr noundef %14) #4
  %15 = getelementptr inbounds %class.VM, ptr %4, i32 0, i32 2
  call void @_ZNSt5queueIP6ObjectSt5dequeIS1_SaIS1_EEE3popEv(ptr noundef nonnull align 8 dereferenceable(80) %15)
  br label %16

16:                                               ; preds = %11
  %17 = load i32, ptr %3, align 4, !tbaa !9
  %18 = add nsw i32 %17, 1
  store i32 %18, ptr %3, align 4, !tbaa !9
  br label %5, !llvm.loop !20

19:                                               ; preds = %10
  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: nocallback nofree nosync nounwind willreturn memory(argmem: readwrite)
declare void @llvm.lifetime.end.p0(i64 immarg, ptr nocapture) #1

; Function Attrs: nounwind
declare void @free(ptr noundef) #2

; Function Attrs: mustprogress nounwind uwtable
declare dso_local noundef nonnull align 8 dereferenceable(8) ptr @_ZNSt5queueIP6ObjectSt5dequeIS1_SaIS1_EEE5frontEv(ptr noundef nonnull align 8 dereferenceable(80)) #3 align 2

; Function Attrs: mustprogress nounwind uwtable
declare dso_local void @_ZNSt5queueIP6ObjectSt5dequeIS1_SaIS1_EEE3popEv(ptr noundef nonnull align 8 dereferenceable(80)) #3 align 2

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 = { nounwind "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 = { 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 176}
!12 = !{!"_ZTS2VM", !13, i64 0, !6, i64 80, !19, i64 88, !10, i64 168, !10, i64 172, !10, i64 176}
!13 = !{!"_ZTSSt5dequeIP6ObjectSaIS1_EE", !14, i64 0}
!14 = !{!"_ZTSSt11_Deque_baseIP6ObjectSaIS1_EE", !15, i64 0}
!15 = !{!"_ZTSNSt11_Deque_baseIP6ObjectSaIS1_EE11_Deque_implE", !16, i64 0}
!16 = !{!"_ZTSNSt11_Deque_baseIP6ObjectSaIS1_EE16_Deque_impl_dataE", !6, i64 0, !17, i64 8, !18, i64 16, !18, i64 48}
!17 = !{!"long", !7, i64 0}
!18 = !{!"_ZTSSt15_Deque_iteratorIP6ObjectRS1_PS1_E", !6, i64 0, !6, i64 8, !6, i64 16, !6, i64 24}
!19 = !{!"_ZTSSt5queueIP6ObjectSt5dequeIS1_SaIS1_EEE", !13, i64 0}
!20 = distinct !{!20, !21}
!21 = !{!"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
define dso_local void @_ZN2VM15destroyFreeListEv(ptr noundef nonnull align 8 dereferenceable(180) %0) local_unnamed_addr #0 align 2 {
  %2 = getelementptr inbounds i8, ptr %0, i64 176
  %3 = load i32, ptr %2, align 8, !tbaa !5
  %4 = icmp sgt i32 %3, 0
  br i1 %4, label %.lr.ph, label %._crit_edge

.lr.ph:                                           ; preds = %1
  %5 = getelementptr inbounds i8, ptr %0, i64 88
  br label %6

._crit_edge:                                      ; preds = %6, %1
  ret void

6:                                                ; preds = %.lr.ph, %6
  %.02 = phi i32 [ 0, %.lr.ph ], [ %9, %6 ]
  %7 = tail call noundef nonnull align 8 dereferenceable(8) ptr @_ZNSt5queueIP6ObjectSt5dequeIS1_SaIS1_EEE5frontEv(ptr noundef nonnull align 8 dereferenceable(80) %5)
  %8 = load ptr, ptr %7, align 8, !tbaa !18
  tail call void @free(ptr noundef %8) #2
  tail call void @_ZNSt5queueIP6ObjectSt5dequeIS1_SaIS1_EEE3popEv(ptr noundef nonnull align 8 dereferenceable(80) %5)
  %9 = add nuw nsw i32 %.02, 1
  %10 = load i32, ptr %2, align 8, !tbaa !5
  %11 = icmp slt i32 %9, %10
  br i1 %11, label %6, label %._crit_edge, !llvm.loop !19
}

; Function Attrs: mustprogress nounwind willreturn allockind("free") memory(argmem: readwrite, inaccessiblemem: readwrite)
declare void @free(ptr allocptr nocapture noundef) local_unnamed_addr #1

; Function Attrs: mustprogress nounwind uwtable
declare dso_local noundef nonnull align 8 dereferenceable(8) ptr @_ZNSt5queueIP6ObjectSt5dequeIS1_SaIS1_EEE5frontEv(ptr noundef nonnull align 8 dereferenceable(80)) local_unnamed_addr #0 align 2

; Function Attrs: mustprogress nounwind uwtable
declare dso_local void @_ZNSt5queueIP6ObjectSt5dequeIS1_SaIS1_EEE3popEv(ptr noundef nonnull align 8 dereferenceable(80)) 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" }
attributes #1 = { mustprogress nounwind willreturn allockind("free") memory(argmem: readwrite, inaccessiblemem: readwrite) "alloc-family"="malloc" "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, !17, i64 176}
!6 = !{!"_ZTS2VM", !7, i64 0, !11, i64 80, !16, i64 88, !17, i64 168, !17, i64 172, !17, i64 176}
!7 = !{!"_ZTSSt5dequeIP6ObjectSaIS1_EE", !8, i64 0}
!8 = !{!"_ZTSSt11_Deque_baseIP6ObjectSaIS1_EE", !9, i64 0}
!9 = !{!"_ZTSNSt11_Deque_baseIP6ObjectSaIS1_EE11_Deque_implE", !10, i64 0}
!10 = !{!"_ZTSNSt11_Deque_baseIP6ObjectSaIS1_EE16_Deque_impl_dataE", !11, i64 0, !14, i64 8, !15, i64 16, !15, i64 48}
!11 = !{!"any pointer", !12, i64 0}
!12 = !{!"omnipotent char", !13, i64 0}
!13 = !{!"Simple C++ TBAA"}
!14 = !{!"long", !12, i64 0}
!15 = !{!"_ZTSSt15_Deque_iteratorIP6ObjectRS1_PS1_E", !11, i64 0, !11, i64 8, !11, i64 16, !11, i64 24}
!16 = !{!"_ZTSSt5queueIP6ObjectSt5dequeIS1_SaIS1_EEE", !7, i64 0}
!17 = !{!"int", !12, i64 0}
!18 = !{!11, !11, i64 0}
!19 = distinct !{!19, !20}
!20 = !{!"llvm.loop.mustprogress"}


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