; LLVM IR from Chasmiccoder/Algos-for-Amigos :: Computer-Science/1-DSA-Fundamentals/2-Stacks-Queues-Linked-Lists/p07_queues_via_li_d3a141fa/Z7enqueueP4NodeS0_NSt7 (traitsIcESaIcEEE)

; 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.Node = type { %"class.std::__cxx11::basic_string", ptr }
%"class.std::__cxx11::basic_string" = type { %"struct.std::__cxx11::basic_string<char>::_Alloc_hider", i64, %union.anon }
%"struct.std::__cxx11::basic_string<char>::_Alloc_hider" = type { ptr }
%union.anon = type { i64, [8 x i8] }

; Function Attrs: mustprogress uwtable
define dso_local void @_Z7enqueueP4NodeS0_NSt7__cxx1112basic_stringIcSt11char_traitsIcESaIcEEE(ptr noundef %0, ptr noundef %1, ptr noundef %2) #0 {
  %4 = alloca ptr, align 8
  %5 = alloca ptr, align 8
  %6 = alloca ptr, align 8
  %7 = alloca ptr, align 8
  %8 = alloca ptr, align 8
  %9 = alloca ptr, align 8
  store ptr %0, ptr %4, align 8, !tbaa !5
  store ptr %1, ptr %5, align 8, !tbaa !5
  store ptr %2, ptr %6, align 8, !tbaa !5
  %10 = load ptr, ptr %4, align 8, !tbaa !5
  %11 = getelementptr inbounds %struct.Node, ptr %10, i32 0, i32 1
  %12 = load ptr, ptr %11, align 8, !tbaa !9
  %13 = icmp eq ptr %12, null
  br i1 %13, label %14, label %29

14:                                               ; preds = %3
  call void @llvm.lifetime.start.p0(i64 8, ptr %7) #4
  %15 = call noalias noundef nonnull ptr @_Znwm(i64 noundef 40) #5
  call void @_ZN4NodeC2Ev(ptr noundef nonnull align 8 dereferenceable(40) %15) #4
  store ptr %15, ptr %7, align 8, !tbaa !5
  %16 = load ptr, ptr %7, align 8, !tbaa !5
  %17 = getelementptr inbounds %struct.Node, ptr %16, i32 0, i32 0
  %18 = call noundef nonnull align 8 dereferenceable(32) ptr @_ZNSt7__cxx1112basic_stringIcSt11char_traitsIcESaIcEEaSERKS4_(ptr noundef nonnull align 8 dereferenceable(32) %17, ptr noundef nonnull align 8 dereferenceable(32) %2)
  %19 = load ptr, ptr %7, align 8, !tbaa !5
  %20 = getelementptr inbounds %struct.Node, ptr %19, i32 0, i32 1
  store ptr null, ptr %20, align 8, !tbaa !9
  %21 = load ptr, ptr %7, align 8, !tbaa !5
  %22 = load ptr, ptr %4, align 8, !tbaa !5
  %23 = getelementptr inbounds %struct.Node, ptr %22, i32 0, i32 1
  store ptr %21, ptr %23, align 8, !tbaa !9
  %24 = load ptr, ptr %5, align 8, !tbaa !5
  %25 = getelementptr inbounds %struct.Node, ptr %24, i32 0, i32 0
  %26 = call noundef nonnull align 8 dereferenceable(32) ptr @_ZNSt7__cxx1112basic_stringIcSt11char_traitsIcESaIcEEaSERKS4_(ptr noundef nonnull align 8 dereferenceable(32) %25, ptr noundef nonnull align 8 dereferenceable(32) %2)
  %27 = load ptr, ptr %5, align 8, !tbaa !5
  %28 = getelementptr inbounds %struct.Node, ptr %27, i32 0, i32 1
  store ptr null, ptr %28, align 8, !tbaa !9
  call void @llvm.lifetime.end.p0(i64 8, ptr %7) #4
  br label %58

29:                                               ; preds = %3
  call void @llvm.lifetime.start.p0(i64 8, ptr %8) #4
  %30 = call noalias noundef nonnull ptr @_Znwm(i64 noundef 40) #5
  call void @_ZN4NodeC2Ev(ptr noundef nonnull align 8 dereferenceable(40) %30) #4
  store ptr %30, ptr %8, align 8, !tbaa !5
  %31 = load ptr, ptr %4, align 8, !tbaa !5
  %32 = getelementptr inbounds %struct.Node, ptr %31, i32 0, i32 1
  %33 = load ptr, ptr %32, align 8, !tbaa !9
  store ptr %33, ptr %8, align 8, !tbaa !5
  br label %34

34:                                               ; preds = %39, %29
  %35 = load ptr, ptr %8, align 8, !tbaa !5
  %36 = getelementptr inbounds %struct.Node, ptr %35, i32 0, i32 1
  %37 = load ptr, ptr %36, align 8, !tbaa !9
  %38 = icmp ne ptr %37, null
  br i1 %38, label %39, label %43

39:                                               ; preds = %34
  %40 = load ptr, ptr %8, align 8, !tbaa !5
  %41 = getelementptr inbounds %struct.Node, ptr %40, i32 0, i32 1
  %42 = load ptr, ptr %41, align 8, !tbaa !9
  store ptr %42, ptr %8, align 8, !tbaa !5
  br label %34, !llvm.loop !14

43:                                               ; preds = %34
  call void @llvm.lifetime.start.p0(i64 8, ptr %9) #4
  %44 = call noalias noundef nonnull ptr @_Znwm(i64 noundef 40) #5
  call void @_ZN4NodeC2Ev(ptr noundef nonnull align 8 dereferenceable(40) %44) #4
  store ptr %44, ptr %9, align 8, !tbaa !5
  %45 = load ptr, ptr %9, align 8, !tbaa !5
  %46 = getelementptr inbounds %struct.Node, ptr %45, i32 0, i32 0
  %47 = call noundef nonnull align 8 dereferenceable(32) ptr @_ZNSt7__cxx1112basic_stringIcSt11char_traitsIcESaIcEEaSERKS4_(ptr noundef nonnull align 8 dereferenceable(32) %46, ptr noundef nonnull align 8 dereferenceable(32) %2)
  %48 = load ptr, ptr %9, align 8, !tbaa !5
  %49 = getelementptr inbounds %struct.Node, ptr %48, i32 0, i32 1
  store ptr null, ptr %49, align 8, !tbaa !9
  %50 = load ptr, ptr %9, align 8, !tbaa !5
  %51 = load ptr, ptr %8, align 8, !tbaa !5
  %52 = getelementptr inbounds %struct.Node, ptr %51, i32 0, i32 1
  store ptr %50, ptr %52, align 8, !tbaa !9
  %53 = load ptr, ptr %5, align 8, !tbaa !5
  %54 = getelementptr inbounds %struct.Node, ptr %53, i32 0, i32 0
  %55 = call noundef nonnull align 8 dereferenceable(32) ptr @_ZNSt7__cxx1112basic_stringIcSt11char_traitsIcESaIcEEaSERKS4_(ptr noundef nonnull align 8 dereferenceable(32) %54, ptr noundef nonnull align 8 dereferenceable(32) %2)
  %56 = load ptr, ptr %5, align 8, !tbaa !5
  %57 = getelementptr inbounds %struct.Node, ptr %56, i32 0, i32 1
  store ptr null, ptr %57, align 8, !tbaa !9
  call void @llvm.lifetime.end.p0(i64 8, ptr %9) #4
  call void @llvm.lifetime.end.p0(i64 8, ptr %8) #4
  br label %58

58:                                               ; preds = %43, %14
  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: nobuiltin allocsize(0)
declare noundef nonnull ptr @_Znwm(i64 noundef) #2

; Function Attrs: inlinehint mustprogress nounwind uwtable
declare dso_local void @_ZN4NodeC2Ev(ptr noundef nonnull align 8 dereferenceable(40)) unnamed_addr #3 align 2

; Function Attrs: mustprogress uwtable
declare noundef nonnull align 8 dereferenceable(32) ptr @_ZNSt7__cxx1112basic_stringIcSt11char_traitsIcESaIcEEaSERKS4_(ptr noundef nonnull align 8 dereferenceable(32), ptr noundef nonnull align 8 dereferenceable(32)) #0 align 2

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

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 = { nobuiltin 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 = { 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 = { nounwind }
attributes #5 = { builtin 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, !6, i64 32}
!10 = !{!"_ZTS4Node", !11, i64 0, !6, i64 32}
!11 = !{!"_ZTSNSt7__cxx1112basic_stringIcSt11char_traitsIcESaIcEEE", !12, i64 0, !13, i64 8, !7, i64 16}
!12 = !{!"_ZTSNSt7__cxx1112basic_stringIcSt11char_traitsIcESaIcEE12_Alloc_hiderE", !6, i64 0}
!13 = !{!"long", !7, i64 0}
!14 = distinct !{!14, !15}
!15 = !{!"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 @_Z7enqueueP4NodeS0_NSt7__cxx1112basic_stringIcSt11char_traitsIcESaIcEEE(ptr nocapture noundef %0, ptr noundef %1, ptr noundef %2) local_unnamed_addr #0 {
  %4 = getelementptr inbounds i8, ptr %0, i64 32
  %5 = load ptr, ptr %4, align 8, !tbaa !5
  %6 = icmp eq ptr %5, null
  %7 = tail call noalias noundef nonnull dereferenceable(40) ptr @_Znwm(i64 noundef 40) #3
  tail call void @_ZN4NodeC2Ev(ptr noundef nonnull align 8 dereferenceable(40) %7) #4
  br i1 %6, label %8, label %11

8:                                                ; preds = %3
  %9 = tail call noundef nonnull align 8 dereferenceable(32) ptr @_ZNSt7__cxx1112basic_stringIcSt11char_traitsIcESaIcEEaSERKS4_(ptr noundef nonnull align 8 dereferenceable(32) %7, ptr noundef nonnull align 8 dereferenceable(32) %2)
  %10 = getelementptr inbounds i8, ptr %7, i64 32
  store ptr null, ptr %10, align 8, !tbaa !5
  store ptr %7, ptr %4, align 8, !tbaa !5
  br label %21

11:                                               ; preds = %3
  %12 = load ptr, ptr %4, align 8, !tbaa !5
  br label %13

13:                                               ; preds = %13, %11
  %.0 = phi ptr [ %12, %11 ], [ %15, %13 ]
  %14 = getelementptr inbounds i8, ptr %.0, i64 32
  %15 = load ptr, ptr %14, align 8, !tbaa !5
  %.not = icmp eq ptr %15, null
  br i1 %.not, label %16, label %13, !llvm.loop !13

16:                                               ; preds = %13
  %17 = getelementptr inbounds i8, ptr %.0, i64 32
  %18 = tail call noalias noundef nonnull dereferenceable(40) ptr @_Znwm(i64 noundef 40) #3
  tail call void @_ZN4NodeC2Ev(ptr noundef nonnull align 8 dereferenceable(40) %18) #4
  %19 = tail call noundef nonnull align 8 dereferenceable(32) ptr @_ZNSt7__cxx1112basic_stringIcSt11char_traitsIcESaIcEEaSERKS4_(ptr noundef nonnull align 8 dereferenceable(32) %18, ptr noundef nonnull align 8 dereferenceable(32) %2)
  %20 = getelementptr inbounds i8, ptr %18, i64 32
  store ptr null, ptr %20, align 8, !tbaa !5
  store ptr %18, ptr %17, align 8, !tbaa !5
  br label %21

21:                                               ; preds = %16, %8
  %22 = tail call noundef nonnull align 8 dereferenceable(32) ptr @_ZNSt7__cxx1112basic_stringIcSt11char_traitsIcESaIcEEaSERKS4_(ptr noundef nonnull align 8 dereferenceable(32) %1, ptr noundef nonnull align 8 dereferenceable(32) %2)
  %23 = getelementptr inbounds i8, ptr %1, i64 32
  store ptr null, ptr %23, align 8, !tbaa !5
  ret void
}

; Function Attrs: nobuiltin allocsize(0)
declare noundef nonnull ptr @_Znwm(i64 noundef) local_unnamed_addr #1

; Function Attrs: inlinehint mustprogress nounwind uwtable
declare dso_local void @_ZN4NodeC2Ev(ptr noundef nonnull align 8 dereferenceable(40)) unnamed_addr #2 align 2

; Function Attrs: mustprogress uwtable
declare noundef nonnull align 8 dereferenceable(32) ptr @_ZNSt7__cxx1112basic_stringIcSt11char_traitsIcESaIcEEaSERKS4_(ptr noundef nonnull align 8 dereferenceable(32), ptr noundef nonnull align 8 dereferenceable(32)) local_unnamed_addr #0 align 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 = { nobuiltin 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 #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 = { builtin allocsize(0) }
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, !9, i64 32}
!6 = !{!"_ZTS4Node", !7, i64 0, !9, i64 32}
!7 = !{!"_ZTSNSt7__cxx1112basic_stringIcSt11char_traitsIcESaIcEEE", !8, i64 0, !12, i64 8, !10, i64 16}
!8 = !{!"_ZTSNSt7__cxx1112basic_stringIcSt11char_traitsIcESaIcEE12_Alloc_hiderE", !9, i64 0}
!9 = !{!"any pointer", !10, i64 0}
!10 = !{!"omnipotent char", !11, i64 0}
!11 = !{!"Simple C++ TBAA"}
!12 = !{!"long", !10, i64 0}
!13 = distinct !{!13, !14}
!14 = !{!"llvm.loop.mustprogress"}


; Effective O3 passes: EarlyCSEPass,GVNPass,GlobalOptPass,InferFunctionAttrsPass,InstCombinePass,InstSimplifyPass,LCSSAPass,LICMPass,LoopUnrollPass,PostOrderFunctionAttrsPass,SROAPass,SimplifyCFGPass,TailCallElimPass