; LLVM IR from VAR-solutions/Algorithms :: Combinatorial Game Theory/Sprague-Grundy Theorem/sprague.ll (Z15calculateGrundyiPi)

; 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.std::unordered_set" = type { %"class.std::_Hashtable" }
%"class.std::_Hashtable" = type { ptr, i64, %"struct.std::__detail::_Hash_node_base", i64, %"struct.std::__detail::_Prime_rehash_policy", ptr }
%"struct.std::__detail::_Hash_node_base" = type { ptr }
%"struct.std::__detail::_Prime_rehash_policy" = type { float, i64 }
%"struct.std::pair" = type <{ %"struct.std::__detail::_Node_iterator", i8, [7 x i8] }>
%"struct.std::__detail::_Node_iterator" = type { %"struct.std::__detail::_Node_iterator_base" }
%"struct.std::__detail::_Node_iterator_base" = type { ptr }

; Function Attrs: mustprogress uwtable
declare dso_local noundef i32 @_Z12calculateMexSt13unordered_setIiSt4hashIiESt8equal_toIiESaIiEE(ptr noundef) #0

; 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
define dso_local noundef i32 @_Z15calculateGrundyiPi(i32 noundef %0, ptr noundef %1) #0 personality ptr @__gxx_personality_v0 {
  %3 = alloca i32, align 4
  %4 = alloca i32, align 4
  %5 = alloca ptr, align 8
  %6 = alloca %"class.std::unordered_set", align 8
  %7 = alloca i32, align 4
  %8 = alloca i32, align 4
  %9 = alloca ptr, align 8
  %10 = alloca i32, align 4
  %11 = alloca %"struct.std::pair", align 8
  %12 = alloca %"class.std::unordered_set", align 8
  store i32 %0, ptr %4, align 4, !tbaa !5
  store ptr %1, ptr %5, align 8, !tbaa !9
  %13 = load ptr, ptr %5, align 8, !tbaa !9
  %14 = getelementptr inbounds i32, ptr %13, i64 0
  store i32 0, ptr %14, align 4, !tbaa !5
  %15 = load ptr, ptr %5, align 8, !tbaa !9
  %16 = getelementptr inbounds i32, ptr %15, i64 1
  store i32 1, ptr %16, align 4, !tbaa !5
  %17 = load ptr, ptr %5, align 8, !tbaa !9
  %18 = getelementptr inbounds i32, ptr %17, i64 2
  store i32 2, ptr %18, align 4, !tbaa !5
  %19 = load ptr, ptr %5, align 8, !tbaa !9
  %20 = getelementptr inbounds i32, ptr %19, i64 3
  store i32 3, ptr %20, align 4, !tbaa !5
  %21 = load ptr, ptr %5, align 8, !tbaa !9
  %22 = load i32, ptr %4, align 4, !tbaa !5
  %23 = sext i32 %22 to i64
  %24 = getelementptr inbounds i32, ptr %21, i64 %23
  %25 = load i32, ptr %24, align 4, !tbaa !5
  %26 = icmp ne i32 %25, -1
  br i1 %26, label %27, label %33

27:                                               ; preds = %2
  %28 = load ptr, ptr %5, align 8, !tbaa !9
  %29 = load i32, ptr %4, align 4, !tbaa !5
  %30 = sext i32 %29 to i64
  %31 = getelementptr inbounds i32, ptr %28, i64 %30
  %32 = load i32, ptr %31, align 4, !tbaa !5
  store i32 %32, ptr %3, align 4
  br label %80

33:                                               ; preds = %2
  call void @llvm.lifetime.start.p0(i64 56, ptr %6) #4
  call void @_ZNSt13unordered_setIiSt4hashIiESt8equal_toIiESaIiEEC2Ev(ptr noundef nonnull align 8 dereferenceable(56) %6) #4
  call void @llvm.lifetime.start.p0(i64 4, ptr %7) #4
  store i32 1, ptr %7, align 4, !tbaa !5
  br label %34

34:                                               ; preds = %51, %33
  %35 = load i32, ptr %7, align 4, !tbaa !5
  %36 = icmp sle i32 %35, 3
  br i1 %36, label %38, label %37

37:                                               ; preds = %34
  call void @llvm.lifetime.end.p0(i64 4, ptr %7) #4
  br label %58

38:                                               ; preds = %34
  call void @llvm.lifetime.start.p0(i64 4, ptr %8) #4
  %39 = load i32, ptr %4, align 4, !tbaa !5
  %40 = load i32, ptr %7, align 4, !tbaa !5
  %41 = sub nsw i32 %39, %40
  %42 = load ptr, ptr %5, align 8, !tbaa !9
  %43 = invoke noundef i32 @_Z15calculateGrundyiPi(i32 noundef %41, ptr noundef %42)
          to label %44 unwind label %54

44:                                               ; preds = %38
  store i32 %43, ptr %8, align 4, !tbaa !5
  %45 = invoke { ptr, i8 } @_ZNSt13unordered_setIiSt4hashIiESt8equal_toIiESaIiEE6insertEOi(ptr noundef nonnull align 8 dereferenceable(56) %6, ptr noundef nonnull align 4 dereferenceable(4) %8)
          to label %46 unwind label %54

46:                                               ; preds = %44
  %47 = getelementptr inbounds { ptr, i8 }, ptr %11, i32 0, i32 0
  %48 = extractvalue { ptr, i8 } %45, 0
  store ptr %48, ptr %47, align 8
  %49 = getelementptr inbounds { ptr, i8 }, ptr %11, i32 0, i32 1
  %50 = extractvalue { ptr, i8 } %45, 1
  store i8 %50, ptr %49, align 8
  call void @llvm.lifetime.end.p0(i64 4, ptr %8) #4
  br label %51

51:                                               ; preds = %46
  %52 = load i32, ptr %7, align 4, !tbaa !5
  %53 = add nsw i32 %52, 1
  store i32 %53, ptr %7, align 4, !tbaa !5
  br label %34, !llvm.loop !11

54:                                               ; preds = %44, %38
  %55 = landingpad { ptr, i32 }
          cleanup
  %56 = extractvalue { ptr, i32 } %55, 0
  store ptr %56, ptr %9, align 8
  %57 = extractvalue { ptr, i32 } %55, 1
  store i32 %57, ptr %10, align 4
  call void @llvm.lifetime.end.p0(i64 4, ptr %8) #4
  call void @llvm.lifetime.end.p0(i64 4, ptr %7) #4
  br label %79

58:                                               ; preds = %37
  invoke void @_ZNSt13unordered_setIiSt4hashIiESt8equal_toIiESaIiEEC2ERKS5_(ptr noundef nonnull align 8 dereferenceable(56) %12, ptr noundef nonnull align 8 dereferenceable(56) %6)
          to label %59 unwind label %71

59:                                               ; preds = %58
  %60 = invoke noundef i32 @_Z12calculateMexSt13unordered_setIiSt4hashIiESt8equal_toIiESaIiEE(ptr noundef %12)
          to label %61 unwind label %75

61:                                               ; preds = %59
  %62 = load ptr, ptr %5, align 8, !tbaa !9
  %63 = load i32, ptr %4, align 4, !tbaa !5
  %64 = sext i32 %63 to i64
  %65 = getelementptr inbounds i32, ptr %62, i64 %64
  store i32 %60, ptr %65, align 4, !tbaa !5
  call void @_ZNSt13unordered_setIiSt4hashIiESt8equal_toIiESaIiEED2Ev(ptr noundef nonnull align 8 dereferenceable(56) %12) #4
  %66 = load ptr, ptr %5, align 8, !tbaa !9
  %67 = load i32, ptr %4, align 4, !tbaa !5
  %68 = sext i32 %67 to i64
  %69 = getelementptr inbounds i32, ptr %66, i64 %68
  %70 = load i32, ptr %69, align 4, !tbaa !5
  store i32 %70, ptr %3, align 4
  call void @_ZNSt13unordered_setIiSt4hashIiESt8equal_toIiESaIiEED2Ev(ptr noundef nonnull align 8 dereferenceable(56) %6) #4
  call void @llvm.lifetime.end.p0(i64 56, ptr %6) #4
  br label %80

71:                                               ; preds = %58
  %72 = landingpad { ptr, i32 }
          cleanup
  %73 = extractvalue { ptr, i32 } %72, 0
  store ptr %73, ptr %9, align 8
  %74 = extractvalue { ptr, i32 } %72, 1
  store i32 %74, ptr %10, align 4
  br label %79

75:                                               ; preds = %59
  %76 = landingpad { ptr, i32 }
          cleanup
  %77 = extractvalue { ptr, i32 } %76, 0
  store ptr %77, ptr %9, align 8
  %78 = extractvalue { ptr, i32 } %76, 1
  store i32 %78, ptr %10, align 4
  call void @_ZNSt13unordered_setIiSt4hashIiESt8equal_toIiESaIiEED2Ev(ptr noundef nonnull align 8 dereferenceable(56) %12) #4
  br label %79

79:                                               ; preds = %75, %71, %54
  call void @_ZNSt13unordered_setIiSt4hashIiESt8equal_toIiESaIiEED2Ev(ptr noundef nonnull align 8 dereferenceable(56) %6) #4
  call void @llvm.lifetime.end.p0(i64 56, ptr %6) #4
  br label %82

80:                                               ; preds = %61, %27
  %81 = load i32, ptr %3, align 4
  ret i32 %81

82:                                               ; preds = %79
  %83 = load ptr, ptr %9, align 8
  %84 = load i32, ptr %10, align 4
  %85 = insertvalue { ptr, i32 } poison, ptr %83, 0
  %86 = insertvalue { ptr, i32 } %85, i32 %84, 1
  resume { ptr, i32 } %86
}

; Function Attrs: mustprogress nounwind uwtable
declare dso_local void @_ZNSt13unordered_setIiSt4hashIiESt8equal_toIiESaIiEEC2Ev(ptr noundef nonnull align 8 dereferenceable(56)) unnamed_addr #2 align 2

; Function Attrs: mustprogress uwtable
declare dso_local { ptr, i8 } @_ZNSt13unordered_setIiSt4hashIiESt8equal_toIiESaIiEE6insertEOi(ptr noundef nonnull align 8 dereferenceable(56), ptr noundef nonnull align 4 dereferenceable(4)) #0 align 2

declare i32 @__gxx_personality_v0(...)

; Function Attrs: mustprogress uwtable
declare dso_local void @_ZNSt13unordered_setIiSt4hashIiESt8equal_toIiESaIiEEC2ERKS5_(ptr noundef nonnull align 8 dereferenceable(56), ptr noundef nonnull align 8 dereferenceable(56)) unnamed_addr #0 align 2

; Function Attrs: inlinehint mustprogress nounwind uwtable
declare dso_local void @_ZNSt13unordered_setIiSt4hashIiESt8equal_toIiESaIiEED2Ev(ptr noundef nonnull align 8 dereferenceable(56)) unnamed_addr #3 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 = { 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 = { 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 }

!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, !10, i64 0}
!10 = !{!"any pointer", !7, i64 0}
!11 = distinct !{!11, !12}
!12 = !{!"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"

%"class.std::unordered_set" = type { %"class.std::_Hashtable" }
%"class.std::_Hashtable" = type { ptr, i64, %"struct.std::__detail::_Hash_node_base", i64, %"struct.std::__detail::_Prime_rehash_policy", ptr }
%"struct.std::__detail::_Hash_node_base" = type { ptr }
%"struct.std::__detail::_Prime_rehash_policy" = type { float, i64 }

; Function Attrs: mustprogress uwtable
declare dso_local noundef i32 @_Z12calculateMexSt13unordered_setIiSt4hashIiESt8equal_toIiESaIiEE(ptr noundef) local_unnamed_addr #0

; 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
define dso_local noundef i32 @_Z15calculateGrundyiPi(i32 noundef %0, ptr nocapture noundef %1) local_unnamed_addr #0 personality ptr @__gxx_personality_v0 {
  %3 = alloca %"class.std::unordered_set", align 8
  %4 = alloca i32, align 4
  %5 = alloca %"class.std::unordered_set", align 8
  store <4 x i32> <i32 0, i32 1, i32 2, i32 3>, ptr %1, align 4, !tbaa !5
  %6 = sext i32 %0 to i64
  %7 = getelementptr inbounds i32, ptr %1, i64 %6
  %8 = load i32, ptr %7, align 4, !tbaa !5
  %.not = icmp eq i32 %8, -1
  br i1 %.not, label %9, label %36

9:                                                ; preds = %2
  call void @llvm.lifetime.start.p0(i64 56, ptr nonnull %3) #4
  call void @_ZNSt13unordered_setIiSt4hashIiESt8equal_toIiESaIiEEC2Ev(ptr noundef nonnull align 8 dereferenceable(56) %3) #4
  call void @llvm.lifetime.start.p0(i64 4, ptr nonnull %4) #4
  %10 = add nsw i32 %0, -1
  %11 = invoke noundef i32 @_Z15calculateGrundyiPi(i32 noundef %10, ptr noundef nonnull %1)
          to label %12 unwind label %25

12:                                               ; preds = %9
  store i32 %11, ptr %4, align 4, !tbaa !5
  %13 = invoke { ptr, i8 } @_ZNSt13unordered_setIiSt4hashIiESt8equal_toIiESaIiEE6insertEOi(ptr noundef nonnull align 8 dereferenceable(56) %3, ptr noundef nonnull align 4 dereferenceable(4) %4)
          to label %14 unwind label %25

14:                                               ; preds = %12
  call void @llvm.lifetime.end.p0(i64 4, ptr nonnull %4) #4
  call void @llvm.lifetime.start.p0(i64 4, ptr nonnull %4) #4
  %15 = add nsw i32 %0, -2
  %16 = invoke noundef i32 @_Z15calculateGrundyiPi(i32 noundef %15, ptr noundef nonnull %1)
          to label %17 unwind label %25

17:                                               ; preds = %14
  store i32 %16, ptr %4, align 4, !tbaa !5
  %18 = invoke { ptr, i8 } @_ZNSt13unordered_setIiSt4hashIiESt8equal_toIiESaIiEE6insertEOi(ptr noundef nonnull align 8 dereferenceable(56) %3, ptr noundef nonnull align 4 dereferenceable(4) %4)
          to label %19 unwind label %25

19:                                               ; preds = %17
  call void @llvm.lifetime.end.p0(i64 4, ptr nonnull %4) #4
  call void @llvm.lifetime.start.p0(i64 4, ptr nonnull %4) #4
  %20 = add nsw i32 %0, -3
  %21 = invoke noundef i32 @_Z15calculateGrundyiPi(i32 noundef %20, ptr noundef nonnull %1)
          to label %22 unwind label %25

22:                                               ; preds = %19
  store i32 %21, ptr %4, align 4, !tbaa !5
  %23 = invoke { ptr, i8 } @_ZNSt13unordered_setIiSt4hashIiESt8equal_toIiESaIiEE6insertEOi(ptr noundef nonnull align 8 dereferenceable(56) %3, ptr noundef nonnull align 4 dereferenceable(4) %4)
          to label %24 unwind label %25

24:                                               ; preds = %22
  call void @llvm.lifetime.end.p0(i64 4, ptr nonnull %4) #4
  invoke void @_ZNSt13unordered_setIiSt4hashIiESt8equal_toIiESaIiEEC2ERKS5_(ptr noundef nonnull align 8 dereferenceable(56) %5, ptr noundef nonnull align 8 dereferenceable(56) %3)
          to label %27 unwind label %31

25:                                               ; preds = %22, %19, %17, %14, %12, %9
  %26 = landingpad { ptr, i32 }
          cleanup
  call void @llvm.lifetime.end.p0(i64 4, ptr nonnull %4) #4
  br label %35

27:                                               ; preds = %24
  %28 = invoke noundef i32 @_Z12calculateMexSt13unordered_setIiSt4hashIiESt8equal_toIiESaIiEE(ptr noundef nonnull %5)
          to label %29 unwind label %33

29:                                               ; preds = %27
  store i32 %28, ptr %7, align 4, !tbaa !5
  call void @_ZNSt13unordered_setIiSt4hashIiESt8equal_toIiESaIiEED2Ev(ptr noundef nonnull align 8 dereferenceable(56) %5) #4
  %30 = load i32, ptr %7, align 4, !tbaa !5
  call void @_ZNSt13unordered_setIiSt4hashIiESt8equal_toIiESaIiEED2Ev(ptr noundef nonnull align 8 dereferenceable(56) %3) #4
  call void @llvm.lifetime.end.p0(i64 56, ptr nonnull %3) #4
  br label %36

31:                                               ; preds = %24
  %32 = landingpad { ptr, i32 }
          cleanup
  br label %35

33:                                               ; preds = %27
  %34 = landingpad { ptr, i32 }
          cleanup
  call void @_ZNSt13unordered_setIiSt4hashIiESt8equal_toIiESaIiEED2Ev(ptr noundef nonnull align 8 dereferenceable(56) %5) #4
  br label %35

35:                                               ; preds = %33, %31, %25
  %.pn = phi { ptr, i32 } [ %26, %25 ], [ %34, %33 ], [ %32, %31 ]
  call void @_ZNSt13unordered_setIiSt4hashIiESt8equal_toIiESaIiEED2Ev(ptr noundef nonnull align 8 dereferenceable(56) %3) #4
  call void @llvm.lifetime.end.p0(i64 56, ptr nonnull %3) #4
  resume { ptr, i32 } %.pn

36:                                               ; preds = %2, %29
  %.0 = phi i32 [ %30, %29 ], [ %8, %2 ]
  ret i32 %.0
}

; Function Attrs: mustprogress nounwind uwtable
declare dso_local void @_ZNSt13unordered_setIiSt4hashIiESt8equal_toIiESaIiEEC2Ev(ptr noundef nonnull align 8 dereferenceable(56)) unnamed_addr #2 align 2

; Function Attrs: mustprogress uwtable
declare dso_local { ptr, i8 } @_ZNSt13unordered_setIiSt4hashIiESt8equal_toIiESaIiEE6insertEOi(ptr noundef nonnull align 8 dereferenceable(56), ptr noundef nonnull align 4 dereferenceable(4)) local_unnamed_addr #0 align 2

declare i32 @__gxx_personality_v0(...)

; Function Attrs: mustprogress uwtable
declare dso_local void @_ZNSt13unordered_setIiSt4hashIiESt8equal_toIiESaIiEEC2ERKS5_(ptr noundef nonnull align 8 dereferenceable(56), ptr noundef nonnull align 8 dereferenceable(56)) unnamed_addr #0 align 2

; Function Attrs: inlinehint mustprogress nounwind uwtable
declare dso_local void @_ZNSt13unordered_setIiSt4hashIiESt8equal_toIiESaIiEED2Ev(ptr noundef nonnull align 8 dereferenceable(56)) unnamed_addr #3 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 = { 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 = { 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 }

!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: EarlyCSEPass,GVNPass,GlobalOptPass,IndVarSimplifyPass,InferFunctionAttrsPass,InstCombinePass,LoopRotatePass,PostOrderFunctionAttrsPass,SLPVectorizerPass,SROAPass,SimplifyCFGPass