; LLVM IR from nbdd0121/GenerationalGC :: Heap.ll (ZN6norlit2gc4Heap18Major_ScanHeapRootEv)

; 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.norlit::gc::Heap::Iterable.1" = type { %"class.norlit::gc::Heap::StackSpaceIterator" }
%"class.norlit::gc::Heap::StackSpaceIterator" = type { ptr }
%"class.norlit::gc::Heap::Iterable<norlit::gc::Heap::StackSpaceIterator>::Iterator" = type { ptr }
%"struct.norlit::gc::Heap::MarkingIterator" = type { %"class.norlit::gc::FieldIterator" }
%"class.norlit::gc::FieldIterator" = type { ptr }

; 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 @_ZN6norlit2gc4Heap18Major_ScanHeapRootEv() #2 align 2 {
  %1 = alloca ptr, align 8
  %2 = alloca %"class.norlit::gc::Heap::Iterable.1", align 8
  %3 = alloca %"class.norlit::gc::Heap::Iterable<norlit::gc::Heap::StackSpaceIterator>::Iterator", align 8
  %4 = alloca %"class.norlit::gc::Heap::Iterable<norlit::gc::Heap::StackSpaceIterator>::Iterator", align 8
  %5 = alloca ptr, align 8
  %6 = alloca %"struct.norlit::gc::Heap::MarkingIterator", align 8
  call void @llvm.lifetime.start.p0(i64 8, ptr %1) #5
  call void @llvm.lifetime.start.p0(i64 8, ptr %2) #5
  call void @_ZN6norlit2gc4Heap8IterableINS1_18StackSpaceIteratorEEC2IJEEEDpOT_(ptr noundef nonnull align 8 dereferenceable(8) %2)
  store ptr %2, ptr %1, align 8, !tbaa !5
  call void @llvm.lifetime.start.p0(i64 8, ptr %3) #5
  %7 = load ptr, ptr %1, align 8, !tbaa !5
  %8 = call ptr @_ZN6norlit2gc4Heap8IterableINS1_18StackSpaceIteratorEE5beginEv(ptr noundef nonnull align 8 dereferenceable(8) %7)
  %9 = getelementptr inbounds %"class.norlit::gc::Heap::Iterable<norlit::gc::Heap::StackSpaceIterator>::Iterator", ptr %3, i32 0, i32 0
  store ptr %8, ptr %9, align 8
  call void @llvm.lifetime.start.p0(i64 8, ptr %4) #5
  %10 = load ptr, ptr %1, align 8, !tbaa !5
  %11 = call ptr @_ZN6norlit2gc4Heap8IterableINS1_18StackSpaceIteratorEE3endEv(ptr noundef nonnull align 8 dereferenceable(8) %10)
  %12 = getelementptr inbounds %"class.norlit::gc::Heap::Iterable<norlit::gc::Heap::StackSpaceIterator>::Iterator", ptr %4, i32 0, i32 0
  store ptr %11, ptr %12, align 8
  br label %13

13:                                               ; preds = %22, %0
  %14 = call noundef zeroext i1 @_ZN6norlit2gc4Heap8IterableINS1_18StackSpaceIteratorEE8IteratorneERKS5_(ptr noundef nonnull align 8 dereferenceable(8) %3, ptr noundef nonnull align 8 dereferenceable(8) %4)
  br i1 %14, label %16, label %15

15:                                               ; preds = %13
  call void @llvm.lifetime.end.p0(i64 8, ptr %4) #5
  call void @llvm.lifetime.end.p0(i64 8, ptr %3) #5
  call void @llvm.lifetime.end.p0(i64 8, ptr %2) #5
  call void @llvm.lifetime.end.p0(i64 8, ptr %1) #5
  br label %23

16:                                               ; preds = %13
  call void @llvm.lifetime.start.p0(i64 8, ptr %5) #5
  %17 = call noundef ptr @_ZN6norlit2gc4Heap8IterableINS1_18StackSpaceIteratorEE8IteratordeEv(ptr noundef nonnull align 8 dereferenceable(8) %3)
  store ptr %17, ptr %5, align 8, !tbaa !5
  %18 = load ptr, ptr %5, align 8, !tbaa !5
  call void @llvm.lifetime.start.p0(i64 8, ptr %6) #5
  call void @llvm.memset.p0.i64(ptr align 8 %6, i8 0, i64 8, i1 false)
  call void @_ZN6norlit2gc4Heap15MarkingIteratorC2Ev(ptr noundef nonnull align 8 dereferenceable(8) %6) #5
  %19 = load ptr, ptr %18, align 8, !tbaa !9
  %20 = getelementptr inbounds ptr, ptr %19, i64 5
  %21 = load ptr, ptr %20, align 8
  call void %21(ptr noundef nonnull align 8 dereferenceable(27) %18, ptr noundef nonnull align 8 dereferenceable(8) %6)
  call void @llvm.lifetime.end.p0(i64 8, ptr %6) #5
  call void @llvm.lifetime.end.p0(i64 8, ptr %5) #5
  br label %22

22:                                               ; preds = %16
  call void @_ZN6norlit2gc4Heap8IterableINS1_18StackSpaceIteratorEE8IteratorppEv(ptr noundef nonnull align 8 dereferenceable(8) %3)
  br label %13

23:                                               ; preds = %15
  ret void
}

; Function Attrs: mustprogress uwtable
declare dso_local void @_ZN6norlit2gc4Heap8IterableINS1_18StackSpaceIteratorEEC2IJEEEDpOT_(ptr noundef nonnull align 8 dereferenceable(8)) unnamed_addr #2 align 2

; Function Attrs: mustprogress uwtable
declare dso_local ptr @_ZN6norlit2gc4Heap8IterableINS1_18StackSpaceIteratorEE5beginEv(ptr noundef nonnull align 8 dereferenceable(8)) #2 align 2

; Function Attrs: mustprogress uwtable
declare dso_local ptr @_ZN6norlit2gc4Heap8IterableINS1_18StackSpaceIteratorEE3endEv(ptr noundef nonnull align 8 dereferenceable(8)) #2 align 2

; Function Attrs: mustprogress uwtable
declare dso_local noundef zeroext i1 @_ZN6norlit2gc4Heap8IterableINS1_18StackSpaceIteratorEE8IteratorneERKS5_(ptr noundef nonnull align 8 dereferenceable(8), ptr noundef nonnull align 8 dereferenceable(8)) #2 align 2

; Function Attrs: mustprogress uwtable
declare dso_local noundef ptr @_ZN6norlit2gc4Heap8IterableINS1_18StackSpaceIteratorEE8IteratordeEv(ptr noundef nonnull align 8 dereferenceable(8)) #2 align 2

; Function Attrs: inlinehint mustprogress nounwind uwtable
declare dso_local void @_ZN6norlit2gc4Heap15MarkingIteratorC2Ev(ptr noundef nonnull align 8 dereferenceable(8)) unnamed_addr #3 align 2

; Function Attrs: mustprogress nounwind uwtable
declare dso_local void @_ZN6norlit2gc4Heap8IterableINS1_18StackSpaceIteratorEE8IteratorppEv(ptr noundef nonnull align 8 dereferenceable(8)) #4 align 2

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 = { 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 = { 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 = { 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 = !{!"vtable pointer", !8, i64 0}


; 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.norlit::gc::Heap::Iterable.1" = type { %"class.norlit::gc::Heap::StackSpaceIterator" }
%"class.norlit::gc::Heap::StackSpaceIterator" = type { ptr }
%"class.norlit::gc::Heap::Iterable<norlit::gc::Heap::StackSpaceIterator>::Iterator" = type { ptr }
%"struct.norlit::gc::Heap::MarkingIterator" = type { %"class.norlit::gc::FieldIterator" }
%"class.norlit::gc::FieldIterator" = type { ptr }

; 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 @_ZN6norlit2gc4Heap18Major_ScanHeapRootEv() local_unnamed_addr #1 align 2 {
  %1 = alloca %"class.norlit::gc::Heap::Iterable.1", align 8
  %2 = alloca %"class.norlit::gc::Heap::Iterable<norlit::gc::Heap::StackSpaceIterator>::Iterator", align 8
  %3 = alloca %"class.norlit::gc::Heap::Iterable<norlit::gc::Heap::StackSpaceIterator>::Iterator", align 8
  %4 = alloca %"struct.norlit::gc::Heap::MarkingIterator", align 8
  call void @llvm.lifetime.start.p0(i64 8, ptr nonnull %1) #4
  call void @_ZN6norlit2gc4Heap8IterableINS1_18StackSpaceIteratorEEC2IJEEEDpOT_(ptr noundef nonnull align 8 dereferenceable(8) %1)
  call void @llvm.lifetime.start.p0(i64 8, ptr nonnull %2) #4
  %5 = call ptr @_ZN6norlit2gc4Heap8IterableINS1_18StackSpaceIteratorEE5beginEv(ptr noundef nonnull align 8 dereferenceable(8) %1)
  store ptr %5, ptr %2, align 8
  call void @llvm.lifetime.start.p0(i64 8, ptr nonnull %3) #4
  %6 = call ptr @_ZN6norlit2gc4Heap8IterableINS1_18StackSpaceIteratorEE3endEv(ptr noundef nonnull align 8 dereferenceable(8) %1)
  store ptr %6, ptr %3, align 8
  %7 = call noundef zeroext i1 @_ZN6norlit2gc4Heap8IterableINS1_18StackSpaceIteratorEE8IteratorneERKS5_(ptr noundef nonnull align 8 dereferenceable(8) %2, ptr noundef nonnull align 8 dereferenceable(8) %3)
  br i1 %7, label %.lr.ph, label %._crit_edge

._crit_edge:                                      ; preds = %.lr.ph, %0
  call void @llvm.lifetime.end.p0(i64 8, ptr nonnull %3) #4
  call void @llvm.lifetime.end.p0(i64 8, ptr nonnull %2) #4
  call void @llvm.lifetime.end.p0(i64 8, ptr nonnull %1) #4
  ret void

.lr.ph:                                           ; preds = %0, %.lr.ph
  %8 = call noundef ptr @_ZN6norlit2gc4Heap8IterableINS1_18StackSpaceIteratorEE8IteratordeEv(ptr noundef nonnull align 8 dereferenceable(8) %2)
  call void @llvm.lifetime.start.p0(i64 8, ptr nonnull %4) #4
  store i64 0, ptr %4, align 8
  call void @_ZN6norlit2gc4Heap15MarkingIteratorC2Ev(ptr noundef nonnull align 8 dereferenceable(8) %4) #4
  %9 = load ptr, ptr %8, align 8, !tbaa !5
  %10 = getelementptr inbounds i8, ptr %9, i64 40
  %11 = load ptr, ptr %10, align 8
  call void %11(ptr noundef nonnull align 8 dereferenceable(27) %8, ptr noundef nonnull align 8 dereferenceable(8) %4)
  call void @llvm.lifetime.end.p0(i64 8, ptr nonnull %4) #4
  call void @_ZN6norlit2gc4Heap8IterableINS1_18StackSpaceIteratorEE8IteratorppEv(ptr noundef nonnull align 8 dereferenceable(8) %2)
  %12 = call noundef zeroext i1 @_ZN6norlit2gc4Heap8IterableINS1_18StackSpaceIteratorEE8IteratorneERKS5_(ptr noundef nonnull align 8 dereferenceable(8) %2, ptr noundef nonnull align 8 dereferenceable(8) %3)
  br i1 %12, label %.lr.ph, label %._crit_edge
}

; Function Attrs: mustprogress uwtable
declare dso_local void @_ZN6norlit2gc4Heap8IterableINS1_18StackSpaceIteratorEEC2IJEEEDpOT_(ptr noundef nonnull align 8 dereferenceable(8)) unnamed_addr #1 align 2

; Function Attrs: mustprogress uwtable
declare dso_local ptr @_ZN6norlit2gc4Heap8IterableINS1_18StackSpaceIteratorEE5beginEv(ptr noundef nonnull align 8 dereferenceable(8)) local_unnamed_addr #1 align 2

; Function Attrs: mustprogress uwtable
declare dso_local ptr @_ZN6norlit2gc4Heap8IterableINS1_18StackSpaceIteratorEE3endEv(ptr noundef nonnull align 8 dereferenceable(8)) local_unnamed_addr #1 align 2

; Function Attrs: mustprogress uwtable
declare dso_local noundef zeroext i1 @_ZN6norlit2gc4Heap8IterableINS1_18StackSpaceIteratorEE8IteratorneERKS5_(ptr noundef nonnull align 8 dereferenceable(8), ptr noundef nonnull align 8 dereferenceable(8)) local_unnamed_addr #1 align 2

; Function Attrs: mustprogress uwtable
declare dso_local noundef ptr @_ZN6norlit2gc4Heap8IterableINS1_18StackSpaceIteratorEE8IteratordeEv(ptr noundef nonnull align 8 dereferenceable(8)) local_unnamed_addr #1 align 2

; Function Attrs: inlinehint mustprogress nounwind uwtable
declare dso_local void @_ZN6norlit2gc4Heap15MarkingIteratorC2Ev(ptr noundef nonnull align 8 dereferenceable(8)) unnamed_addr #2 align 2

; Function Attrs: mustprogress nounwind uwtable
declare dso_local void @_ZN6norlit2gc4Heap8IterableINS1_18StackSpaceIteratorEE8IteratorppEv(ptr noundef nonnull align 8 dereferenceable(8)) local_unnamed_addr #3 align 2

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 = { 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 #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 = !{!"vtable pointer", !7, i64 0}
!7 = !{!"Simple C++ TBAA"}


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