; LLVM IR from Deborah-Digges/mark-sweep-simulation :: 01-marksweep-simple/vm.ll (ZN2VM13buildFreeListEv)

; 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 @_ZN2VM13buildFreeListEv(ptr noundef nonnull align 8 dereferenceable(180) %0) #0 align 2 {
  %2 = alloca ptr, align 8
  %3 = alloca i32, align 4
  %4 = alloca ptr, align 8
  store ptr %0, ptr %2, align 8, !tbaa !5
  %5 = 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 %6

6:                                                ; preds = %15, %1
  %7 = load i32, ptr %3, align 4, !tbaa !9
  %8 = getelementptr inbounds %class.VM, ptr %5, i32 0, i32 5
  %9 = load i32, ptr %8, align 8, !tbaa !11
  %10 = icmp slt i32 %7, %9
  br i1 %10, label %12, label %11

11:                                               ; preds = %6
  call void @llvm.lifetime.end.p0(i64 4, ptr %3) #3
  br label %18

12:                                               ; preds = %6
  %13 = getelementptr inbounds %class.VM, ptr %5, i32 0, i32 2
  call void @llvm.lifetime.start.p0(i64 8, ptr %4) #3
  %14 = call noalias ptr @malloc(i64 noundef 32) #4
  store ptr %14, ptr %4, align 8, !tbaa !5
  call void @_ZNSt5queueIP6ObjectSt5dequeIS1_SaIS1_EEE4pushEOS1_(ptr noundef nonnull align 8 dereferenceable(80) %13, ptr noundef nonnull align 8 dereferenceable(8) %4)
  call void @llvm.lifetime.end.p0(i64 8, ptr %4) #3
  br label %15

15:                                               ; preds = %12
  %16 = load i32, ptr %3, align 4, !tbaa !9
  %17 = add nsw i32 %16, 1
  store i32 %17, ptr %3, align 4, !tbaa !9
  br label %6, !llvm.loop !20

18:                                               ; preds = %11
  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: mustprogress uwtable
declare dso_local void @_ZNSt5queueIP6ObjectSt5dequeIS1_SaIS1_EEE4pushEOS1_(ptr noundef nonnull align 8 dereferenceable(80), ptr noundef nonnull align 8 dereferenceable(8)) #0 align 2

; Function Attrs: nounwind allocsize(0)
declare noalias ptr @malloc(i64 noundef) #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 allocsize(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 }
attributes #4 = { nounwind allocsize(0) }

!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 uwtable
define dso_local void @_ZN2VM13buildFreeListEv(ptr noundef nonnull align 8 dereferenceable(180) %0) local_unnamed_addr #0 align 2 {
  %2 = alloca ptr, align 8
  %3 = getelementptr inbounds i8, ptr %0, i64 176
  %4 = load i32, ptr %3, align 8, !tbaa !5
  %5 = icmp sgt i32 %4, 0
  br i1 %5, label %.lr.ph, label %._crit_edge

.lr.ph:                                           ; preds = %1
  %6 = getelementptr inbounds i8, ptr %0, i64 88
  br label %7

._crit_edge:                                      ; preds = %7, %1
  ret void

7:                                                ; preds = %.lr.ph, %7
  %.02 = phi i32 [ 0, %.lr.ph ], [ %9, %7 ]
  call void @llvm.lifetime.start.p0(i64 8, ptr nonnull %2) #3
  %8 = call noalias dereferenceable_or_null(32) ptr @malloc(i64 noundef 32) #4
  store ptr %8, ptr %2, align 8, !tbaa !18
  call void @_ZNSt5queueIP6ObjectSt5dequeIS1_SaIS1_EEE4pushEOS1_(ptr noundef nonnull align 8 dereferenceable(80) %6, ptr noundef nonnull align 8 dereferenceable(8) %2)
  call void @llvm.lifetime.end.p0(i64 8, ptr nonnull %2) #3
  %9 = add nuw nsw i32 %.02, 1
  %10 = load i32, ptr %3, align 8, !tbaa !5
  %11 = icmp slt i32 %9, %10
  br i1 %11, label %7, label %._crit_edge, !llvm.loop !19
}

; Function Attrs: mustprogress nocallback nofree nosync nounwind willreturn memory(argmem: readwrite)
declare void @llvm.lifetime.start.p0(i64 immarg, ptr nocapture) #1

; Function Attrs: mustprogress nocallback nofree nosync nounwind willreturn memory(argmem: readwrite)
declare void @llvm.lifetime.end.p0(i64 immarg, ptr nocapture) #1

; Function Attrs: mustprogress uwtable
declare dso_local void @_ZNSt5queueIP6ObjectSt5dequeIS1_SaIS1_EEE4pushEOS1_(ptr noundef nonnull align 8 dereferenceable(80), ptr noundef nonnull align 8 dereferenceable(8)) local_unnamed_addr #0 align 2

; Function Attrs: mustprogress nofree nounwind willreturn allockind("alloc,uninitialized") allocsize(0) memory(inaccessiblemem: readwrite)
declare noalias noundef ptr @malloc(i64 noundef) local_unnamed_addr #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 = { mustprogress nocallback nofree nosync nounwind willreturn memory(argmem: readwrite) }
attributes #2 = { mustprogress nofree nounwind willreturn allockind("alloc,uninitialized") allocsize(0) memory(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 #3 = { nounwind }
attributes #4 = { nounwind allocsize(0) }

!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: GlobalOptPass,InferFunctionAttrsPass,InstCombinePass,JumpThreadingPass,LICMPass,LoopRotatePass,LoopSimplifyPass,LoopUnrollPass,SROAPass,SimplifyCFGPass