; LLVM IR from ADJA/algos :: Graphs/BipartiteMatchingKuhn.ll (Z4kuhni)

; 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::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 }

@g = external dso_local global [105 x %"class.std::vector"], align 16
@used = external dso_local global [105 x i8], align 16
@mt = external dso_local global [105 x i32], align 16

; Function Attrs: mustprogress uwtable
define dso_local noundef zeroext i1 @_Z4kuhni(i32 noundef %0) #0 {
  %2 = alloca i1, align 1
  %3 = alloca i32, align 4
  %4 = alloca i32, align 4
  %5 = alloca i32, align 4
  %6 = alloca i32, align 4
  store i32 %0, ptr %3, align 4, !tbaa !5
  %7 = load i32, ptr %3, align 4, !tbaa !5
  %8 = sext i32 %7 to i64
  %9 = getelementptr inbounds [105 x i8], ptr @used, i64 0, i64 %8
  %10 = load i8, ptr %9, align 1, !tbaa !9, !range !11, !noundef !12
  %11 = trunc i8 %10 to i1
  br i1 %11, label %12, label %13

12:                                               ; preds = %1
  store i1 false, ptr %2, align 1
  br label %60

13:                                               ; preds = %1
  %14 = load i32, ptr %3, align 4, !tbaa !5
  %15 = sext i32 %14 to i64
  %16 = getelementptr inbounds [105 x i8], ptr @used, i64 0, i64 %15
  store i8 1, ptr %16, align 1, !tbaa !9
  call void @llvm.lifetime.start.p0(i64 4, ptr %4) #3
  store i32 0, ptr %4, align 4, !tbaa !5
  br label %17

17:                                               ; preds = %54, %13
  %18 = load i32, ptr %4, align 4, !tbaa !5
  %19 = load i32, ptr %3, align 4, !tbaa !5
  %20 = sext i32 %19 to i64
  %21 = getelementptr inbounds [105 x %"class.std::vector"], ptr @g, i64 0, i64 %20
  %22 = call noundef i64 @_ZNKSt6vectorIiSaIiEE4sizeEv(ptr noundef nonnull align 8 dereferenceable(24) %21) #3
  %23 = trunc i64 %22 to i32
  %24 = icmp slt i32 %18, %23
  br i1 %24, label %26, label %25

25:                                               ; preds = %17
  store i32 2, ptr %5, align 4
  br label %57

26:                                               ; preds = %17
  call void @llvm.lifetime.start.p0(i64 4, ptr %6) #3
  %27 = load i32, ptr %3, align 4, !tbaa !5
  %28 = sext i32 %27 to i64
  %29 = getelementptr inbounds [105 x %"class.std::vector"], ptr @g, i64 0, i64 %28
  %30 = load i32, ptr %4, align 4, !tbaa !5
  %31 = sext i32 %30 to i64
  %32 = call noundef nonnull align 4 dereferenceable(4) ptr @_ZNSt6vectorIiSaIiEEixEm(ptr noundef nonnull align 8 dereferenceable(24) %29, i64 noundef %31) #3
  %33 = load i32, ptr %32, align 4, !tbaa !5
  store i32 %33, ptr %6, align 4, !tbaa !5
  %34 = load i32, ptr %6, align 4, !tbaa !5
  %35 = sext i32 %34 to i64
  %36 = getelementptr inbounds [105 x i32], ptr @mt, i64 0, i64 %35
  %37 = load i32, ptr %36, align 4, !tbaa !5
  %38 = icmp eq i32 %37, 0
  br i1 %38, label %45, label %39

39:                                               ; preds = %26
  %40 = load i32, ptr %6, align 4, !tbaa !5
  %41 = sext i32 %40 to i64
  %42 = getelementptr inbounds [105 x i32], ptr @mt, i64 0, i64 %41
  %43 = load i32, ptr %42, align 4, !tbaa !5
  %44 = call noundef zeroext i1 @_Z4kuhni(i32 noundef %43)
  br i1 %44, label %45, label %50

45:                                               ; preds = %39, %26
  %46 = load i32, ptr %3, align 4, !tbaa !5
  %47 = load i32, ptr %6, align 4, !tbaa !5
  %48 = sext i32 %47 to i64
  %49 = getelementptr inbounds [105 x i32], ptr @mt, i64 0, i64 %48
  store i32 %46, ptr %49, align 4, !tbaa !5
  store i1 true, ptr %2, align 1
  store i32 1, ptr %5, align 4
  br label %51

50:                                               ; preds = %39
  store i32 0, ptr %5, align 4
  br label %51

51:                                               ; preds = %50, %45
  call void @llvm.lifetime.end.p0(i64 4, ptr %6) #3
  %52 = load i32, ptr %5, align 4
  switch i32 %52, label %57 [
    i32 0, label %53
  ]

53:                                               ; preds = %51
  br label %54

54:                                               ; preds = %53
  %55 = load i32, ptr %4, align 4, !tbaa !5
  %56 = add nsw i32 %55, 1
  store i32 %56, ptr %4, align 4, !tbaa !5
  br label %17, !llvm.loop !13

57:                                               ; preds = %51, %25
  call void @llvm.lifetime.end.p0(i64 4, ptr %4) #3
  %58 = load i32, ptr %5, align 4
  switch i32 %58, label %62 [
    i32 2, label %59
    i32 1, label %60
  ]

59:                                               ; preds = %57
  store i1 false, ptr %2, align 1
  br label %60

60:                                               ; preds = %59, %57, %12
  %61 = load i1, ptr %2, align 1
  ret i1 %61

62:                                               ; preds = %57
  unreachable
}

; 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 noundef i64 @_ZNKSt6vectorIiSaIiEE4sizeEv(ptr noundef nonnull align 8 dereferenceable(24)) #2 align 2

; Function Attrs: mustprogress nounwind uwtable
declare dso_local noundef nonnull align 4 dereferenceable(4) ptr @_ZNSt6vectorIiSaIiEEixEm(ptr noundef nonnull align 8 dereferenceable(24), i64 noundef) #2 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 = { 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 = { 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 = !{!"bool", !7, i64 0}
!11 = !{i8 0, i8 2}
!12 = !{}
!13 = distinct !{!13, !14}
!14 = !{!"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::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 }

@g = external dso_local global [105 x %"class.std::vector"], align 16
@used = external dso_local local_unnamed_addr global [105 x i8], align 16
@mt = external dso_local local_unnamed_addr global [105 x i32], align 16

; Function Attrs: mustprogress nounwind uwtable
define dso_local noundef zeroext i1 @_Z4kuhni(i32 noundef %0) local_unnamed_addr #0 {
  %2 = sext i32 %0 to i64
  %3 = getelementptr inbounds [105 x i8], ptr @used, i64 0, i64 %2
  %4 = load i8, ptr %3, align 1, !tbaa !5, !range !9, !noundef !10
  %5 = trunc nuw i8 %4 to i1
  br i1 %5, label %.loopexit, label %6

6:                                                ; preds = %1
  store i8 1, ptr %3, align 1, !tbaa !5
  %7 = getelementptr inbounds [105 x %"class.std::vector"], ptr @g, i64 0, i64 %2
  %8 = tail call noundef i64 @_ZNKSt6vectorIiSaIiEE4sizeEv(ptr noundef nonnull align 8 dereferenceable(24) %7) #1
  %9 = trunc i64 %8 to i32
  %.not19 = icmp sgt i32 %9, 0
  br i1 %.not19, label %.lr.ph, label %.loopexit

10:                                               ; preds = %19
  %indvars.iv.next = add nuw nsw i64 %indvars.iv, 1
  %11 = tail call noundef i64 @_ZNKSt6vectorIiSaIiEE4sizeEv(ptr noundef nonnull align 8 dereferenceable(24) %7) #1
  %sext = shl i64 %11, 32
  %12 = ashr exact i64 %sext, 32
  %.not = icmp slt i64 %indvars.iv.next, %12
  br i1 %.not, label %.lr.ph, label %.loopexit, !llvm.loop !11

.lr.ph:                                           ; preds = %6, %10
  %indvars.iv = phi i64 [ %indvars.iv.next, %10 ], [ 0, %6 ]
  %13 = tail call noundef nonnull align 4 dereferenceable(4) ptr @_ZNSt6vectorIiSaIiEEixEm(ptr noundef nonnull align 8 dereferenceable(24) %7, i64 noundef %indvars.iv) #1
  %14 = load i32, ptr %13, align 4, !tbaa !13
  %15 = sext i32 %14 to i64
  %16 = getelementptr inbounds [105 x i32], ptr @mt, i64 0, i64 %15
  %17 = load i32, ptr %16, align 4, !tbaa !13
  %18 = icmp eq i32 %17, 0
  br i1 %18, label %.critedge, label %19

19:                                               ; preds = %.lr.ph
  %20 = tail call noundef zeroext i1 @_Z4kuhni(i32 noundef %17)
  br i1 %20, label %.critedge, label %10

.critedge:                                        ; preds = %19, %.lr.ph
  %21 = getelementptr inbounds [105 x i32], ptr @mt, i64 0, i64 %15
  store i32 %0, ptr %21, align 4, !tbaa !13
  br label %.loopexit

.loopexit:                                        ; preds = %10, %6, %.critedge, %1
  %.3 = phi i1 [ false, %1 ], [ true, %.critedge ], [ false, %6 ], [ false, %10 ]
  ret i1 %.3
}

; Function Attrs: mustprogress nounwind uwtable
declare dso_local noundef i64 @_ZNKSt6vectorIiSaIiEE4sizeEv(ptr noundef nonnull align 8 dereferenceable(24)) local_unnamed_addr #0 align 2

; Function Attrs: mustprogress nounwind uwtable
declare dso_local noundef nonnull align 4 dereferenceable(4) ptr @_ZNSt6vectorIiSaIiEEixEm(ptr noundef nonnull align 8 dereferenceable(24), i64 noundef) local_unnamed_addr #0 align 2

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, !6, i64 0}
!6 = !{!"bool", !7, i64 0}
!7 = !{!"omnipotent char", !8, i64 0}
!8 = !{!"Simple C++ TBAA"}
!9 = !{i8 0, i8 2}
!10 = !{}
!11 = distinct !{!11, !12}
!12 = !{!"llvm.loop.mustprogress"}
!13 = !{!14, !14, i64 0}
!14 = !{!"int", !7, i64 0}


; Effective O3 passes: ConstraintEliminationPass,CorrelatedValuePropagationPass,EarlyCSEPass,GVNPass,GlobalOptPass,IPSCCPPass,IndVarSimplifyPass,InferFunctionAttrsPass,InstCombinePass,InstSimplifyPass,JumpThreadingPass,LCSSAPass,LICMPass,LoopRotatePass,LoopSimplifyPass,LoopUnrollPass,PostOrderFunctionAttrsPass,SROAPass,SimplifyCFGPass,TailCallElimPass