; LLVM IR from achilles288/robot-monitor-graphics :: src/base/context_container.ll (ZN3rmg11ContextList8iteratorppEv)

; 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.rmg::ContextList::iterator" = type { ptr, ptr }
%"struct.rmg::LinkedList<rmg::Context>::Node" = type { ptr, ptr }

; Function Attrs: mustprogress nounwind uwtable
define dso_local noundef nonnull align 8 dereferenceable(16) ptr @_ZN3rmg11ContextList8iteratorppEv(ptr noundef nonnull align 8 dereferenceable(16) %0) #0 align 2 {
  %2 = alloca ptr, align 8
  store ptr %0, ptr %2, align 8, !tbaa !5
  %3 = load ptr, ptr %2, align 8
  %4 = getelementptr inbounds %"class.rmg::ContextList::iterator", ptr %3, i32 0, i32 0
  %5 = load ptr, ptr %4, align 8, !tbaa !9
  %6 = icmp ne ptr %5, null
  br i1 %6, label %7, label %18

7:                                                ; preds = %1
  %8 = getelementptr inbounds %"class.rmg::ContextList::iterator", ptr %3, i32 0, i32 0
  %9 = load ptr, ptr %8, align 8, !tbaa !9
  %10 = getelementptr inbounds %"struct.rmg::LinkedList<rmg::Context>::Node", ptr %9, i32 0, i32 1
  %11 = load ptr, ptr %10, align 8, !tbaa !11
  %12 = getelementptr inbounds %"class.rmg::ContextList::iterator", ptr %3, i32 0, i32 1
  store ptr %11, ptr %12, align 8, !tbaa !13
  %13 = getelementptr inbounds %"class.rmg::ContextList::iterator", ptr %3, i32 0, i32 0
  %14 = load ptr, ptr %13, align 8, !tbaa !9
  %15 = getelementptr inbounds %"struct.rmg::LinkedList<rmg::Context>::Node", ptr %14, i32 0, i32 0
  %16 = load ptr, ptr %15, align 8, !tbaa !14
  %17 = getelementptr inbounds %"class.rmg::ContextList::iterator", ptr %3, i32 0, i32 0
  store ptr %16, ptr %17, align 8, !tbaa !9
  br label %20

18:                                               ; preds = %1
  %19 = getelementptr inbounds %"class.rmg::ContextList::iterator", ptr %3, i32 0, i32 1
  store ptr null, ptr %19, align 8, !tbaa !13
  br label %20

20:                                               ; preds = %18, %7
  ret ptr %3
}

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" }

!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, !6, i64 0}
!10 = !{!"_ZTSN3rmg11ContextList8iteratorE", !6, i64 0, !6, i64 8}
!11 = !{!12, !6, i64 8}
!12 = !{!"_ZTSN3rmg10LinkedListINS_7ContextEE4NodeE", !6, i64 0, !6, i64 8}
!13 = !{!10, !6, i64 8}
!14 = !{!12, !6, 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 norecurse nosync nounwind willreturn memory(read, argmem: readwrite, inaccessiblemem: none) uwtable
define dso_local noundef nonnull align 8 dereferenceable(16) ptr @_ZN3rmg11ContextList8iteratorppEv(ptr noundef nonnull returned align 8 dereferenceable(16) %0) local_unnamed_addr #0 align 2 {
  %2 = load ptr, ptr %0, align 8, !tbaa !5
  %.not = icmp eq ptr %2, null
  br i1 %.not, label %7, label %3

3:                                                ; preds = %1
  %4 = getelementptr inbounds i8, ptr %2, i64 8
  %5 = load ptr, ptr %4, align 8, !tbaa !10
  %6 = load ptr, ptr %2, align 8, !tbaa !12
  store ptr %6, ptr %0, align 8, !tbaa !5
  br label %7

7:                                                ; preds = %1, %3
  %.sink = phi ptr [ %5, %3 ], [ null, %1 ]
  %8 = getelementptr inbounds i8, ptr %0, i64 8
  store ptr %.sink, ptr %8, align 8
  ret ptr %0
}

attributes #0 = { mustprogress nofree norecurse nosync nounwind willreturn memory(read, argmem: 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, !7, i64 0}
!6 = !{!"_ZTSN3rmg11ContextList8iteratorE", !7, i64 0, !7, i64 8}
!7 = !{!"any pointer", !8, i64 0}
!8 = !{!"omnipotent char", !9, i64 0}
!9 = !{!"Simple C++ TBAA"}
!10 = !{!11, !7, i64 8}
!11 = !{!"_ZTSN3rmg10LinkedListINS_7ContextEE4NodeE", !7, i64 0, !7, i64 8}
!12 = !{!11, !7, i64 0}


; Effective O3 passes: EarlyCSEPass,GlobalOptPass,InstCombinePass,JumpThreadingPass,MergedLoadStoreMotionPass,PostOrderFunctionAttrsPass,SROAPass