; LLVM IR from UtkarshPathrabe/Competitive-Coding :: Model Algorithms/Graphs (Maximum Bipartite Matching)

; 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"

; Function Attrs: mustprogress uwtable
declare dso_local noundef zeroext i1 @_Z3BPMRSt6vectorIS_IbSaIbEESaIS1_EEiPbPi(ptr noundef nonnull align 8 dereferenceable(24), i32 noundef, ptr noundef, 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: mustprogress nounwind uwtable
declare dso_local noundef i64 @_ZNKSt6vectorIS_IbSaIbEESaIS1_EE4sizeEv(ptr noundef nonnull align 8 dereferenceable(24)) #2 align 2

; Function Attrs: mustprogress nounwind uwtable
declare dso_local noundef nonnull align 8 dereferenceable(40) ptr @_ZNSt6vectorIS_IbSaIbEESaIS1_EEixEm(ptr noundef nonnull align 8 dereferenceable(24), i64 noundef) #2 align 2

; Function Attrs: mustprogress nounwind uwtable
declare dso_local noundef i64 @_ZNKSt6vectorIbSaIbEE4sizeEv(ptr noundef nonnull align 8 dereferenceable(40)) #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
define dso_local noundef i32 @_Z6maxBPMRSt6vectorIS_IbSaIbEESaIS1_EE(ptr noundef nonnull align 8 dereferenceable(24) %0) #0 {
  %2 = alloca ptr, align 8
  %3 = alloca i32, align 4
  %4 = alloca i32, align 4
  %5 = alloca ptr, align 8
  %6 = alloca i64, align 8
  %7 = alloca i32, align 4
  %8 = alloca i32, align 4
  %9 = alloca ptr, align 8
  %10 = alloca i64, align 8
  store ptr %0, ptr %2, align 8, !tbaa !5
  call void @llvm.lifetime.start.p0(i64 4, ptr %3) #5
  %11 = load ptr, ptr %2, align 8, !tbaa !5
  %12 = call noundef i64 @_ZNKSt6vectorIS_IbSaIbEESaIS1_EE4sizeEv(ptr noundef nonnull align 8 dereferenceable(24) %11) #5
  %13 = trunc i64 %12 to i32
  store i32 %13, ptr %3, align 4, !tbaa !9
  call void @llvm.lifetime.start.p0(i64 4, ptr %4) #5
  %14 = load ptr, ptr %2, align 8, !tbaa !5
  %15 = call noundef nonnull align 8 dereferenceable(40) ptr @_ZNSt6vectorIS_IbSaIbEESaIS1_EEixEm(ptr noundef nonnull align 8 dereferenceable(24) %14, i64 noundef 0) #5
  %16 = call noundef i64 @_ZNKSt6vectorIbSaIbEE4sizeEv(ptr noundef nonnull align 8 dereferenceable(40) %15) #5
  %17 = trunc i64 %16 to i32
  store i32 %17, ptr %4, align 4, !tbaa !9
  %18 = load i32, ptr %4, align 4, !tbaa !9
  %19 = zext i32 %18 to i64
  %20 = call ptr @llvm.stacksave.p0()
  store ptr %20, ptr %5, align 8
  %21 = alloca i32, i64 %19, align 16
  store i64 %19, ptr %6, align 8
  %22 = mul nuw i64 4, %19
  call void @llvm.memset.p0.i64(ptr align 16 %21, i8 -1, i64 %22, i1 false)
  call void @llvm.lifetime.start.p0(i64 4, ptr %7) #5
  store i32 0, ptr %7, align 4, !tbaa !9
  call void @llvm.lifetime.start.p0(i64 4, ptr %8) #5
  store i32 0, ptr %8, align 4, !tbaa !9
  br label %23

23:                                               ; preds = %41, %1
  %24 = load i32, ptr %8, align 4, !tbaa !9
  %25 = load i32, ptr %3, align 4, !tbaa !9
  %26 = icmp slt i32 %24, %25
  br i1 %26, label %28, label %27

27:                                               ; preds = %23
  call void @llvm.lifetime.end.p0(i64 4, ptr %8) #5
  br label %44

28:                                               ; preds = %23
  %29 = load i32, ptr %4, align 4, !tbaa !9
  %30 = zext i32 %29 to i64
  %31 = call ptr @llvm.stacksave.p0()
  store ptr %31, ptr %9, align 8
  %32 = alloca i8, i64 %30, align 16
  store i64 %30, ptr %10, align 8
  call void @llvm.memset.p0.i64(ptr align 16 %32, i8 0, i64 %30, i1 false)
  %33 = load ptr, ptr %2, align 8, !tbaa !5
  %34 = load i32, ptr %8, align 4, !tbaa !9
  %35 = call noundef zeroext i1 @_Z3BPMRSt6vectorIS_IbSaIbEESaIS1_EEiPbPi(ptr noundef nonnull align 8 dereferenceable(24) %33, i32 noundef %34, ptr noundef %32, ptr noundef %21)
  br i1 %35, label %36, label %39

36:                                               ; preds = %28
  %37 = load i32, ptr %7, align 4, !tbaa !9
  %38 = add nsw i32 %37, 1
  store i32 %38, ptr %7, align 4, !tbaa !9
  br label %39

39:                                               ; preds = %36, %28
  %40 = load ptr, ptr %9, align 8
  call void @llvm.stackrestore.p0(ptr %40)
  br label %41

41:                                               ; preds = %39
  %42 = load i32, ptr %8, align 4, !tbaa !9
  %43 = add nsw i32 %42, 1
  store i32 %43, ptr %8, align 4, !tbaa !9
  br label %23, !llvm.loop !11

44:                                               ; preds = %27
  %45 = load i32, ptr %7, align 4, !tbaa !9
  call void @llvm.lifetime.end.p0(i64 4, ptr %7) #5
  %46 = load ptr, ptr %5, align 8
  call void @llvm.stackrestore.p0(ptr %46)
  call void @llvm.lifetime.end.p0(i64 4, ptr %4) #5
  call void @llvm.lifetime.end.p0(i64 4, ptr %3) #5
  ret i32 %45
}

; Function Attrs: nocallback nofree nosync nounwind willreturn
declare ptr @llvm.stacksave.p0() #3

; Function Attrs: nocallback nofree nounwind willreturn memory(argmem: write)
declare void @llvm.memset.p0.i64(ptr nocapture writeonly, i8, i64, i1 immarg) #4

; Function Attrs: nocallback nofree nosync nounwind willreturn
declare void @llvm.stackrestore.p0(ptr) #3

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 = { nocallback nofree nosync nounwind willreturn }
attributes #4 = { nocallback nofree nounwind willreturn memory(argmem: write) }
attributes #5 = { 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, !10, i64 0}
!10 = !{!"int", !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"

; Function Attrs: mustprogress uwtable
declare dso_local noundef zeroext i1 @_Z3BPMRSt6vectorIS_IbSaIbEESaIS1_EEiPbPi(ptr noundef nonnull align 8 dereferenceable(24), i32 noundef, ptr noundef, ptr noundef) local_unnamed_addr #0

; Function Attrs: mustprogress nounwind uwtable
declare dso_local noundef i64 @_ZNKSt6vectorIS_IbSaIbEESaIS1_EE4sizeEv(ptr noundef nonnull align 8 dereferenceable(24)) local_unnamed_addr #1 align 2

; Function Attrs: mustprogress nounwind uwtable
declare dso_local noundef nonnull align 8 dereferenceable(40) ptr @_ZNSt6vectorIS_IbSaIbEESaIS1_EEixEm(ptr noundef nonnull align 8 dereferenceable(24), i64 noundef) local_unnamed_addr #1 align 2

; Function Attrs: mustprogress nounwind uwtable
declare dso_local noundef i64 @_ZNKSt6vectorIbSaIbEE4sizeEv(ptr noundef nonnull align 8 dereferenceable(40)) local_unnamed_addr #1 align 2

; Function Attrs: mustprogress uwtable
define dso_local noundef i32 @_Z6maxBPMRSt6vectorIS_IbSaIbEESaIS1_EE(ptr noundef nonnull align 8 dereferenceable(24) %0) local_unnamed_addr #0 {
  %2 = tail call noundef i64 @_ZNKSt6vectorIS_IbSaIbEESaIS1_EE4sizeEv(ptr noundef nonnull align 8 dereferenceable(24) %0) #4
  %3 = trunc i64 %2 to i32
  %4 = tail call noundef nonnull align 8 dereferenceable(40) ptr @_ZNSt6vectorIS_IbSaIbEESaIS1_EEixEm(ptr noundef nonnull align 8 dereferenceable(24) %0, i64 noundef 0) #4
  %5 = tail call noundef i64 @_ZNKSt6vectorIbSaIbEE4sizeEv(ptr noundef nonnull align 8 dereferenceable(40) %4) #4
  %6 = and i64 %5, 4294967295
  %7 = alloca i32, i64 %6, align 16
  %8 = shl nuw nsw i64 %6, 2
  call void @llvm.memset.p0.i64(ptr nonnull align 16 %7, i8 -1, i64 %8, i1 false)
  %9 = icmp sgt i32 %3, 0
  br i1 %9, label %.lr.ph, label %._crit_edge

._crit_edge:                                      ; preds = %.lr.ph, %1
  %.0.lcssa = phi i32 [ 0, %1 ], [ %spec.select, %.lr.ph ]
  ret i32 %.0.lcssa

.lr.ph:                                           ; preds = %1, %.lr.ph
  %.014 = phi i32 [ %spec.select, %.lr.ph ], [ 0, %1 ]
  %.01213 = phi i32 [ %14, %.lr.ph ], [ 0, %1 ]
  %10 = call ptr @llvm.stacksave.p0()
  %11 = alloca i8, i64 %6, align 16
  call void @llvm.memset.p0.i64(ptr nonnull align 16 %11, i8 0, i64 %6, i1 false)
  %12 = call noundef zeroext i1 @_Z3BPMRSt6vectorIS_IbSaIbEESaIS1_EEiPbPi(ptr noundef nonnull align 8 dereferenceable(24) %0, i32 noundef %.01213, ptr noundef nonnull %11, ptr noundef nonnull %7)
  %13 = zext i1 %12 to i32
  %spec.select = add nuw nsw i32 %.014, %13
  call void @llvm.stackrestore.p0(ptr %10)
  %14 = add nuw nsw i32 %.01213, 1
  %exitcond.not = icmp eq i32 %14, %3
  br i1 %exitcond.not, label %._crit_edge, label %.lr.ph, !llvm.loop !5
}

; Function Attrs: mustprogress nocallback nofree nosync nounwind willreturn
declare ptr @llvm.stacksave.p0() #2

; Function Attrs: mustprogress nocallback nofree nounwind willreturn memory(argmem: write)
declare void @llvm.memset.p0.i64(ptr nocapture writeonly, i8, i64, i1 immarg) #3

; Function Attrs: mustprogress nocallback nofree nosync nounwind willreturn
declare void @llvm.stackrestore.p0(ptr) #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 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 = { mustprogress nocallback nofree nosync nounwind willreturn }
attributes #3 = { mustprogress nocallback nofree nounwind willreturn memory(argmem: write) }
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 = distinct !{!5, !6}
!6 = !{!"llvm.loop.mustprogress"}


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