; LLVM IR from Deborah-Digges/mark-sweep-simulation :: 01-marksweep-simple/vm.ll (ZN2VM4markEP6Object)

; 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"

%struct.Object = type { i32, i32, ptr, %union.anon }
%union.anon = type { %struct.anon }
%struct.anon = type { ptr, ptr }

; Function Attrs: mustprogress uwtable
define dso_local void @_ZN2VM4markEP6Object(ptr noundef nonnull align 8 dereferenceable(180) %0, ptr noundef %1) #0 align 2 {
  %3 = alloca ptr, align 8
  %4 = alloca ptr, align 8
  store ptr %0, ptr %3, align 8, !tbaa !5
  store ptr %1, ptr %4, align 8, !tbaa !5
  %5 = load ptr, ptr %3, align 8
  %6 = load ptr, ptr %4, align 8, !tbaa !5
  %7 = getelementptr inbounds %struct.Object, ptr %6, i32 0, i32 1
  %8 = load i32, ptr %7, align 4, !tbaa !9
  %9 = icmp ne i32 %8, 0
  br i1 %9, label %10, label %11

10:                                               ; preds = %2
  br label %27

11:                                               ; preds = %2
  %12 = load ptr, ptr %4, align 8, !tbaa !5
  %13 = getelementptr inbounds %struct.Object, ptr %12, i32 0, i32 1
  store i32 1, ptr %13, align 4, !tbaa !9
  %14 = load ptr, ptr %4, align 8, !tbaa !5
  %15 = getelementptr inbounds %struct.Object, ptr %14, i32 0, i32 0
  %16 = load i32, ptr %15, align 8, !tbaa !13
  %17 = icmp eq i32 %16, 1
  br i1 %17, label %18, label %27

18:                                               ; preds = %11
  %19 = load ptr, ptr %4, align 8, !tbaa !5
  %20 = getelementptr inbounds %struct.Object, ptr %19, i32 0, i32 3
  %21 = getelementptr inbounds %struct.anon, ptr %20, i32 0, i32 0
  %22 = load ptr, ptr %21, align 8, !tbaa !14
  call void @_ZN2VM4markEP6Object(ptr noundef nonnull align 8 dereferenceable(180) %5, ptr noundef %22)
  %23 = load ptr, ptr %4, align 8, !tbaa !5
  %24 = getelementptr inbounds %struct.Object, ptr %23, i32 0, i32 3
  %25 = getelementptr inbounds %struct.anon, ptr %24, i32 0, i32 1
  %26 = load ptr, ptr %25, align 8, !tbaa !14
  call void @_ZN2VM4markEP6Object(ptr noundef nonnull align 8 dereferenceable(180) %5, ptr noundef %26)
  br label %27

27:                                               ; preds = %18, %11, %10
  ret void
}

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" }

!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 = !{!7, !7, 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"

; Function Attrs: mustprogress nofree nosync nounwind memory(readwrite, inaccessiblemem: none) uwtable
define dso_local void @_ZN2VM4markEP6Object(ptr nocapture noundef nonnull readnone align 8 dereferenceable(180) %0, ptr nocapture noundef %1) local_unnamed_addr #0 align 2 {
  %3 = getelementptr inbounds i8, ptr %1, i64 4
  %4 = load i32, ptr %3, align 4, !tbaa !5
  %.not7 = icmp eq i32 %4, 0
  br i1 %.not7, label %.lr.ph, label %tailrecurse._crit_edge

.lr.ph:                                           ; preds = %2, %tailrecurse
  %5 = phi ptr [ %12, %tailrecurse ], [ %3, %2 ]
  %.tr68 = phi ptr [ %11, %tailrecurse ], [ %1, %2 ]
  store i32 1, ptr %5, align 4, !tbaa !5
  %6 = load i32, ptr %.tr68, align 8, !tbaa !12
  %7 = icmp eq i32 %6, 1
  br i1 %7, label %tailrecurse, label %tailrecurse._crit_edge

tailrecurse:                                      ; preds = %.lr.ph
  %8 = getelementptr inbounds i8, ptr %.tr68, i64 16
  %9 = load ptr, ptr %8, align 8, !tbaa !13
  tail call void @_ZN2VM4markEP6Object(ptr noundef nonnull align 8 dereferenceable(180) %0, ptr noundef %9)
  %10 = getelementptr inbounds i8, ptr %.tr68, i64 24
  %11 = load ptr, ptr %10, align 8, !tbaa !13
  %12 = getelementptr inbounds i8, ptr %11, i64 4
  %13 = load i32, ptr %12, align 4, !tbaa !5
  %.not = icmp eq i32 %13, 0
  br i1 %.not, label %.lr.ph, label %tailrecurse._crit_edge

tailrecurse._crit_edge:                           ; preds = %.lr.ph, %tailrecurse, %2
  ret void
}

attributes #0 = { mustprogress nofree nosync nounwind memory(readwrite, inaccessiblemem: none) 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" }

!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, !10, i64 4}
!6 = !{!"_ZTS6Object", !7, i64 0, !10, i64 4, !11, i64 8, !8, i64 16}
!7 = !{!"_ZTS10ObjectType", !8, i64 0}
!8 = !{!"omnipotent char", !9, i64 0}
!9 = !{!"Simple C++ TBAA"}
!10 = !{!"int", !8, i64 0}
!11 = !{!"any pointer", !8, i64 0}
!12 = !{!6, !7, i64 0}
!13 = !{!8, !8, i64 0}


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