; LLVM IR from gem5/gem5 :: ext/systemc/src/sysc/utils/sc_list.ll (ZN7sc_core13sc_plist_base8pop_backEv)

; 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.sc_core::sc_plist_base" = type { ptr, ptr }
%"class.sc_core::sc_plist_elem" = type { ptr, ptr, ptr }

; Function Attrs: nocallback nofree nosync nounwind willreturn memory(argmem: readwrite)
declare void @llvm.lifetime.start.p0(i64 immarg, ptr nocapture) #0

; Function Attrs: mustprogress nounwind uwtable
declare dso_local void @_ZN7sc_core13sc_plist_elemD2Ev(ptr noundef nonnull align 8 dereferenceable(24)) unnamed_addr #1 align 2

; Function Attrs: mustprogress nounwind uwtable
declare dso_local void @_ZN7sc_core13sc_plist_elemdlEPvm(ptr noundef, i64 noundef) #1 align 2

; Function Attrs: nocallback nofree nosync nounwind willreturn memory(argmem: readwrite)
declare void @llvm.lifetime.end.p0(i64 immarg, ptr nocapture) #0

; Function Attrs: mustprogress nounwind uwtable
define dso_local noundef ptr @_ZN7sc_core13sc_plist_base8pop_backEv(ptr noundef nonnull align 8 dereferenceable(16) %0) #1 align 2 {
  %2 = alloca ptr, align 8
  %3 = alloca ptr, align 8
  %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 8, ptr %3) #2
  %6 = getelementptr inbounds %"class.sc_core::sc_plist_base", ptr %5, i32 0, i32 1
  %7 = load ptr, ptr %6, align 8, !tbaa !9
  store ptr %7, ptr %3, align 8, !tbaa !5
  call void @llvm.lifetime.start.p0(i64 8, ptr %4) #2
  %8 = load ptr, ptr %3, align 8, !tbaa !5
  %9 = getelementptr inbounds %"class.sc_core::sc_plist_elem", ptr %8, i32 0, i32 0
  %10 = load ptr, ptr %9, align 8, !tbaa !11
  store ptr %10, ptr %4, align 8, !tbaa !5
  %11 = getelementptr inbounds %"class.sc_core::sc_plist_base", ptr %5, i32 0, i32 1
  %12 = load ptr, ptr %11, align 8, !tbaa !9
  %13 = getelementptr inbounds %"class.sc_core::sc_plist_elem", ptr %12, i32 0, i32 1
  %14 = load ptr, ptr %13, align 8, !tbaa !13
  %15 = getelementptr inbounds %"class.sc_core::sc_plist_base", ptr %5, i32 0, i32 1
  store ptr %14, ptr %15, align 8, !tbaa !9
  %16 = load ptr, ptr %3, align 8, !tbaa !5
  %17 = icmp eq ptr %16, null
  br i1 %17, label %19, label %18

18:                                               ; preds = %1
  call void @_ZN7sc_core13sc_plist_elemD2Ev(ptr noundef nonnull align 8 dereferenceable(24) %16) #2
  call void @_ZN7sc_core13sc_plist_elemdlEPvm(ptr noundef %16, i64 noundef 24) #2
  br label %19

19:                                               ; preds = %18, %1
  %20 = getelementptr inbounds %"class.sc_core::sc_plist_base", ptr %5, i32 0, i32 1
  %21 = load ptr, ptr %20, align 8, !tbaa !9
  %22 = icmp ne ptr %21, null
  br i1 %22, label %23, label %27

23:                                               ; preds = %19
  %24 = getelementptr inbounds %"class.sc_core::sc_plist_base", ptr %5, i32 0, i32 1
  %25 = load ptr, ptr %24, align 8, !tbaa !9
  %26 = getelementptr inbounds %"class.sc_core::sc_plist_elem", ptr %25, i32 0, i32 2
  store ptr null, ptr %26, align 8, !tbaa !14
  br label %29

27:                                               ; preds = %19
  %28 = getelementptr inbounds %"class.sc_core::sc_plist_base", ptr %5, i32 0, i32 0
  store ptr null, ptr %28, align 8, !tbaa !15
  br label %29

29:                                               ; preds = %27, %23
  %30 = load ptr, ptr %4, align 8, !tbaa !5
  call void @llvm.lifetime.end.p0(i64 8, ptr %4) #2
  call void @llvm.lifetime.end.p0(i64 8, ptr %3) #2
  ret ptr %30
}

attributes #0 = { nocallback nofree nosync nounwind willreturn memory(argmem: readwrite) }
attributes #1 = { 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 #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, !6, i64 0}
!6 = !{!"any pointer", !7, i64 0}
!7 = !{!"omnipotent char", !8, i64 0}
!8 = !{!"Simple C++ TBAA"}
!9 = !{!10, !6, i64 8}
!10 = !{!"_ZTSN7sc_core13sc_plist_baseE", !6, i64 0, !6, i64 8}
!11 = !{!12, !6, i64 0}
!12 = !{!"_ZTSN7sc_core13sc_plist_elemE", !6, i64 0, !6, i64 8, !6, i64 16}
!13 = !{!12, !6, i64 8}
!14 = !{!12, !6, i64 16}
!15 = !{!10, !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 nounwind uwtable
declare dso_local void @_ZN7sc_core13sc_plist_elemD2Ev(ptr noundef nonnull align 8 dereferenceable(24)) unnamed_addr #0 align 2

; Function Attrs: mustprogress nounwind uwtable
declare dso_local void @_ZN7sc_core13sc_plist_elemdlEPvm(ptr noundef, i64 noundef) local_unnamed_addr #0 align 2

; Function Attrs: mustprogress nounwind uwtable
define dso_local noundef ptr @_ZN7sc_core13sc_plist_base8pop_backEv(ptr nocapture noundef nonnull align 8 dereferenceable(16) %0) local_unnamed_addr #0 align 2 {
  %2 = getelementptr inbounds i8, ptr %0, i64 8
  %3 = load ptr, ptr %2, align 8, !tbaa !5
  %4 = load ptr, ptr %3, align 8, !tbaa !10
  %5 = getelementptr inbounds i8, ptr %3, i64 8
  %6 = load ptr, ptr %5, align 8, !tbaa !12
  store ptr %6, ptr %2, align 8, !tbaa !5
  tail call void @_ZN7sc_core13sc_plist_elemD2Ev(ptr noundef nonnull align 8 dereferenceable(24) %3) #1
  tail call void @_ZN7sc_core13sc_plist_elemdlEPvm(ptr noundef nonnull %3, i64 noundef 24) #1
  %7 = load ptr, ptr %2, align 8, !tbaa !5
  %.not = icmp eq ptr %7, null
  %8 = getelementptr inbounds i8, ptr %7, i64 16
  %.sink = select i1 %.not, ptr %0, ptr %8
  store ptr null, ptr %.sink, align 8, !tbaa !13
  ret ptr %4
}

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 = { 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, !7, i64 8}
!6 = !{!"_ZTSN7sc_core13sc_plist_baseE", !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 0}
!11 = !{!"_ZTSN7sc_core13sc_plist_elemE", !7, i64 0, !7, i64 8, !7, i64 16}
!12 = !{!11, !7, i64 8}
!13 = !{!7, !7, i64 0}


; Effective O3 passes: EarlyCSEPass,GlobalOptPass,IPSCCPPass,InferFunctionAttrsPass,InstCombinePass,PostOrderFunctionAttrsPass,SROAPass,SimplifyCFGPass,TailCallElimPass