; LLVM IR from yanglr/leetcode-ac :: cpp-leetcode (leetcode47-permutations-ii_backtracking)

; 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.Solution = type { i8 }
%"class.std::vector" = type { %"struct.std::_Vector_base" }
%"struct.std::_Vector_base" = type { %"struct.std::_Vector_base<int, std::allocator<int>>::_Vector_impl" }
%"struct.std::_Vector_base<int, std::allocator<int>>::_Vector_impl" = type { %"struct.std::_Vector_base<int, std::allocator<int>>::_Vector_impl_data" }
%"struct.std::_Vector_base<int, std::allocator<int>>::_Vector_impl_data" = type { ptr, ptr, ptr }
%"class.std::initializer_list" = type { ptr, i64 }
%"class.std::allocator" = type { i8 }
%"class.std::vector.0" = type { %"struct.std::_Vector_base.1" }
%"struct.std::_Vector_base.1" = type { %"struct.std::_Vector_base<std::vector<int>, std::allocator<std::vector<int>>>::_Vector_impl" }
%"struct.std::_Vector_base<std::vector<int>, std::allocator<std::vector<int>>>::_Vector_impl" = type { %"struct.std::_Vector_base<std::vector<int>, std::allocator<std::vector<int>>>::_Vector_impl_data" }
%"struct.std::_Vector_base<std::vector<int>, std::allocator<std::vector<int>>>::_Vector_impl_data" = type { ptr, ptr, ptr }

; Function Attrs: mustprogress norecurse uwtable
define dso_local noundef i32 @main() #0 personality ptr @__gxx_personality_v0 {
  %1 = alloca i32, align 4
  %2 = alloca %class.Solution, align 1
  %3 = alloca %"class.std::vector", align 8
  %4 = alloca %"class.std::initializer_list", align 8
  %5 = alloca [4 x i32], align 4
  %6 = alloca %"class.std::allocator", align 1
  %7 = alloca ptr, align 8
  %8 = alloca i32, align 4
  %9 = alloca %"class.std::vector.0", align 8
  store i32 0, ptr %1, align 4
  call void @llvm.lifetime.start.p0(i64 1, ptr %2) #4
  call void @llvm.lifetime.start.p0(i64 24, ptr %3) #4
  call void @llvm.lifetime.start.p0(i64 16, ptr %5) #4
  store i32 1, ptr %5, align 4, !tbaa !5
  %10 = getelementptr inbounds i32, ptr %5, i64 1
  store i32 1, ptr %10, align 4, !tbaa !5
  %11 = getelementptr inbounds i32, ptr %5, i64 2
  store i32 2, ptr %11, align 4, !tbaa !5
  %12 = getelementptr inbounds i32, ptr %5, i64 3
  store i32 3, ptr %12, align 4, !tbaa !5
  %13 = getelementptr inbounds %"class.std::initializer_list", ptr %4, i32 0, i32 0
  store ptr %5, ptr %13, align 8, !tbaa !9
  %14 = getelementptr inbounds %"class.std::initializer_list", ptr %4, i32 0, i32 1
  store i64 4, ptr %14, align 8, !tbaa !13
  call void @llvm.lifetime.start.p0(i64 1, ptr %6) #4
  call void @_ZNSaIiEC2Ev(ptr noundef nonnull align 1 dereferenceable(1) %6) #4
  %15 = getelementptr inbounds { ptr, i64 }, ptr %4, i32 0, i32 0
  %16 = load ptr, ptr %15, align 8
  %17 = getelementptr inbounds { ptr, i64 }, ptr %4, i32 0, i32 1
  %18 = load i64, ptr %17, align 8
  invoke void @_ZNSt6vectorIiSaIiEEC2ESt16initializer_listIiERKS0_(ptr noundef nonnull align 8 dereferenceable(24) %3, ptr %16, i64 %18, ptr noundef nonnull align 1 dereferenceable(1) %6)
          to label %19 unwind label %22

19:                                               ; preds = %0
  call void @_ZNSt15__new_allocatorIiED2Ev(ptr noundef nonnull align 1 dereferenceable(1) %6) #4
  call void @llvm.lifetime.end.p0(i64 1, ptr %6) #4
  call void @llvm.lifetime.end.p0(i64 16, ptr %5) #4
  call void @llvm.lifetime.start.p0(i64 24, ptr %9) #4
  invoke void @_ZN8Solution13permuteUniqueERSt6vectorIiSaIiEE(ptr dead_on_unwind writable sret(%"class.std::vector.0") align 8 %9, ptr noundef nonnull align 1 dereferenceable(1) %2, ptr noundef nonnull align 8 dereferenceable(24) %3)
          to label %20 unwind label %26

20:                                               ; preds = %19
  store i32 0, ptr %1, align 4
  call void @_ZNSt6vectorIS_IiSaIiEESaIS1_EED2Ev(ptr noundef nonnull align 8 dereferenceable(24) %9) #4
  call void @llvm.lifetime.end.p0(i64 24, ptr %9) #4
  call void @_ZNSt6vectorIiSaIiEED2Ev(ptr noundef nonnull align 8 dereferenceable(24) %3) #4
  call void @llvm.lifetime.end.p0(i64 24, ptr %3) #4
  call void @llvm.lifetime.end.p0(i64 1, ptr %2) #4
  %21 = load i32, ptr %1, align 4
  ret i32 %21

22:                                               ; preds = %0
  %23 = landingpad { ptr, i32 }
          cleanup
  %24 = extractvalue { ptr, i32 } %23, 0
  store ptr %24, ptr %7, align 8
  %25 = extractvalue { ptr, i32 } %23, 1
  store i32 %25, ptr %8, align 4
  call void @_ZNSt15__new_allocatorIiED2Ev(ptr noundef nonnull align 1 dereferenceable(1) %6) #4
  call void @llvm.lifetime.end.p0(i64 1, ptr %6) #4
  call void @llvm.lifetime.end.p0(i64 16, ptr %5) #4
  br label %30

26:                                               ; preds = %19
  %27 = landingpad { ptr, i32 }
          cleanup
  %28 = extractvalue { ptr, i32 } %27, 0
  store ptr %28, ptr %7, align 8
  %29 = extractvalue { ptr, i32 } %27, 1
  store i32 %29, ptr %8, align 4
  call void @llvm.lifetime.end.p0(i64 24, ptr %9) #4
  call void @_ZNSt6vectorIiSaIiEED2Ev(ptr noundef nonnull align 8 dereferenceable(24) %3) #4
  br label %30

30:                                               ; preds = %26, %22
  call void @llvm.lifetime.end.p0(i64 24, ptr %3) #4
  call void @llvm.lifetime.end.p0(i64 1, ptr %2) #4
  br label %31

31:                                               ; preds = %30
  %32 = load ptr, ptr %7, align 8
  %33 = load i32, ptr %8, align 4
  %34 = insertvalue { ptr, i32 } poison, ptr %32, 0
  %35 = insertvalue { ptr, i32 } %34, i32 %33, 1
  resume { ptr, i32 } %35
}

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

; Function Attrs: mustprogress nounwind uwtable
declare dso_local void @_ZNSaIiEC2Ev(ptr noundef nonnull align 1 dereferenceable(1)) unnamed_addr #2 align 2

; Function Attrs: mustprogress uwtable
declare dso_local void @_ZNSt6vectorIiSaIiEEC2ESt16initializer_listIiERKS0_(ptr noundef nonnull align 8 dereferenceable(24), ptr, i64, ptr noundef nonnull align 1 dereferenceable(1)) unnamed_addr #3 align 2

declare i32 @__gxx_personality_v0(...)

; Function Attrs: mustprogress nounwind uwtable
declare dso_local void @_ZNSt15__new_allocatorIiED2Ev(ptr noundef nonnull align 1 dereferenceable(1)) unnamed_addr #2 align 2

; 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 @_ZN8Solution13permuteUniqueERSt6vectorIiSaIiEE(ptr dead_on_unwind noalias writable sret(%"class.std::vector.0") align 8, ptr noundef nonnull align 1 dereferenceable(1), ptr noundef nonnull align 8 dereferenceable(24)) #3 align 2

; Function Attrs: mustprogress nounwind uwtable
declare dso_local void @_ZNSt6vectorIS_IiSaIiEESaIS1_EED2Ev(ptr noundef nonnull align 8 dereferenceable(24)) unnamed_addr #2 align 2

; Function Attrs: mustprogress nounwind uwtable
declare dso_local void @_ZNSt6vectorIiSaIiEED2Ev(ptr noundef nonnull align 8 dereferenceable(24)) unnamed_addr #2 align 2

attributes #0 = { mustprogress norecurse 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 = { 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 = { 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 #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, !6, i64 0}
!6 = !{!"int", !7, i64 0}
!7 = !{!"omnipotent char", !8, i64 0}
!8 = !{!"Simple C++ TBAA"}
!9 = !{!10, !11, i64 0}
!10 = !{!"_ZTSSt16initializer_listIiE", !11, i64 0, !12, i64 8}
!11 = !{!"any pointer", !7, i64 0}
!12 = !{!"long", !7, i64 0}
!13 = !{!10, !12, i64 8}


; 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"

%class.Solution = type { i8 }
%"class.std::vector" = type { %"struct.std::_Vector_base" }
%"struct.std::_Vector_base" = type { %"struct.std::_Vector_base<int, std::allocator<int>>::_Vector_impl" }
%"struct.std::_Vector_base<int, std::allocator<int>>::_Vector_impl" = type { %"struct.std::_Vector_base<int, std::allocator<int>>::_Vector_impl_data" }
%"struct.std::_Vector_base<int, std::allocator<int>>::_Vector_impl_data" = type { ptr, ptr, ptr }
%"class.std::allocator" = type { i8 }
%"class.std::vector.0" = type { %"struct.std::_Vector_base.1" }
%"struct.std::_Vector_base.1" = type { %"struct.std::_Vector_base<std::vector<int>, std::allocator<std::vector<int>>>::_Vector_impl" }
%"struct.std::_Vector_base<std::vector<int>, std::allocator<std::vector<int>>>::_Vector_impl" = type { %"struct.std::_Vector_base<std::vector<int>, std::allocator<std::vector<int>>>::_Vector_impl_data" }
%"struct.std::_Vector_base<std::vector<int>, std::allocator<std::vector<int>>>::_Vector_impl_data" = type { ptr, ptr, ptr }

; Function Attrs: mustprogress norecurse uwtable
define dso_local noundef i32 @main() local_unnamed_addr #0 personality ptr @__gxx_personality_v0 {
  %1 = alloca %class.Solution, align 1
  %2 = alloca %"class.std::vector", align 8
  %3 = alloca [4 x i32], align 16
  %4 = alloca %"class.std::allocator", align 1
  %5 = alloca %"class.std::vector.0", align 8
  call void @llvm.lifetime.start.p0(i64 1, ptr nonnull %1) #4
  call void @llvm.lifetime.start.p0(i64 24, ptr nonnull %2) #4
  call void @llvm.lifetime.start.p0(i64 16, ptr nonnull %3) #4
  store <4 x i32> <i32 1, i32 1, i32 2, i32 3>, ptr %3, align 16, !tbaa !5
  call void @llvm.lifetime.start.p0(i64 1, ptr nonnull %4) #4
  call void @_ZNSaIiEC2Ev(ptr noundef nonnull align 1 dereferenceable(1) %4) #4
  invoke void @_ZNSt6vectorIiSaIiEEC2ESt16initializer_listIiERKS0_(ptr noundef nonnull align 8 dereferenceable(24) %2, ptr nonnull %3, i64 4, ptr noundef nonnull align 1 dereferenceable(1) %4)
          to label %6 unwind label %8

6:                                                ; preds = %0
  call void @_ZNSt15__new_allocatorIiED2Ev(ptr noundef nonnull align 1 dereferenceable(1) %4) #4
  call void @llvm.lifetime.end.p0(i64 1, ptr nonnull %4) #4
  call void @llvm.lifetime.end.p0(i64 16, ptr nonnull %3) #4
  call void @llvm.lifetime.start.p0(i64 24, ptr nonnull %5) #4
  invoke void @_ZN8Solution13permuteUniqueERSt6vectorIiSaIiEE(ptr dead_on_unwind nonnull writable sret(%"class.std::vector.0") align 8 %5, ptr noundef nonnull align 1 dereferenceable(1) %1, ptr noundef nonnull align 8 dereferenceable(24) %2)
          to label %7 unwind label %10

7:                                                ; preds = %6
  call void @_ZNSt6vectorIS_IiSaIiEESaIS1_EED2Ev(ptr noundef nonnull align 8 dereferenceable(24) %5) #4
  call void @llvm.lifetime.end.p0(i64 24, ptr nonnull %5) #4
  call void @_ZNSt6vectorIiSaIiEED2Ev(ptr noundef nonnull align 8 dereferenceable(24) %2) #4
  call void @llvm.lifetime.end.p0(i64 24, ptr nonnull %2) #4
  call void @llvm.lifetime.end.p0(i64 1, ptr nonnull %1) #4
  ret i32 0

8:                                                ; preds = %0
  %9 = landingpad { ptr, i32 }
          cleanup
  call void @_ZNSt15__new_allocatorIiED2Ev(ptr noundef nonnull align 1 dereferenceable(1) %4) #4
  call void @llvm.lifetime.end.p0(i64 1, ptr nonnull %4) #4
  call void @llvm.lifetime.end.p0(i64 16, ptr nonnull %3) #4
  br label %12

10:                                               ; preds = %6
  %11 = landingpad { ptr, i32 }
          cleanup
  call void @llvm.lifetime.end.p0(i64 24, ptr nonnull %5) #4
  call void @_ZNSt6vectorIiSaIiEED2Ev(ptr noundef nonnull align 8 dereferenceable(24) %2) #4
  br label %12

12:                                               ; preds = %10, %8
  %.pn = phi { ptr, i32 } [ %11, %10 ], [ %9, %8 ]
  call void @llvm.lifetime.end.p0(i64 24, ptr nonnull %2) #4
  call void @llvm.lifetime.end.p0(i64 1, ptr nonnull %1) #4
  resume { ptr, i32 } %.pn
}

; 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 nounwind uwtable
declare dso_local void @_ZNSaIiEC2Ev(ptr noundef nonnull align 1 dereferenceable(1)) unnamed_addr #2 align 2

; Function Attrs: mustprogress uwtable
declare dso_local void @_ZNSt6vectorIiSaIiEEC2ESt16initializer_listIiERKS0_(ptr noundef nonnull align 8 dereferenceable(24), ptr, i64, ptr noundef nonnull align 1 dereferenceable(1)) unnamed_addr #3 align 2

declare i32 @__gxx_personality_v0(...)

; Function Attrs: mustprogress nounwind uwtable
declare dso_local void @_ZNSt15__new_allocatorIiED2Ev(ptr noundef nonnull align 1 dereferenceable(1)) unnamed_addr #2 align 2

; 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 @_ZN8Solution13permuteUniqueERSt6vectorIiSaIiEE(ptr dead_on_unwind noalias writable sret(%"class.std::vector.0") align 8, ptr noundef nonnull align 1 dereferenceable(1), ptr noundef nonnull align 8 dereferenceable(24)) local_unnamed_addr #3 align 2

; Function Attrs: mustprogress nounwind uwtable
declare dso_local void @_ZNSt6vectorIS_IiSaIiEESaIS1_EED2Ev(ptr noundef nonnull align 8 dereferenceable(24)) unnamed_addr #2 align 2

; Function Attrs: mustprogress nounwind uwtable
declare dso_local void @_ZNSt6vectorIiSaIiEED2Ev(ptr noundef nonnull align 8 dereferenceable(24)) unnamed_addr #2 align 2

attributes #0 = { mustprogress norecurse 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 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 = { 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 #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, !6, i64 0}
!6 = !{!"int", !7, i64 0}
!7 = !{!"omnipotent char", !8, i64 0}
!8 = !{!"Simple C++ TBAA"}


; Effective O3 passes: GlobalOptPass,InferAlignmentPass,InferFunctionAttrsPass,InstCombinePass,SLPVectorizerPass,SROAPass,SimplifyCFGPass