; LLVM IR from UtkarshPathrabe/Competitive-Coding :: Codeforces/Codeforces Round 321 (Div 2)/Kefa And Park.ll (ZN5Graph3DFSEiiPb)

; 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.Graph = type { i32, ptr }

; Function Attrs: mustprogress uwtable
declare dso_local void @_ZN5Graph7DFSUtilEiPbS0_iiPi(ptr noundef nonnull align 8 dereferenceable(16), i32 noundef, ptr noundef, ptr noundef, i32 noundef, i32 noundef, ptr noundef) #0 align 2

; 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 @_ZN5Graph3DFSEiiPb(ptr noundef nonnull align 8 dereferenceable(16) %0, i32 noundef %1, i32 noundef %2, ptr noundef %3) #0 align 2 {
  %5 = alloca ptr, align 8
  %6 = alloca i32, align 4
  %7 = alloca i32, align 4
  %8 = alloca ptr, align 8
  %9 = alloca ptr, align 8
  %10 = alloca i32, align 4
  %11 = alloca i32, align 4
  store ptr %0, ptr %5, align 8, !tbaa !5
  store i32 %1, ptr %6, align 4, !tbaa !9
  store i32 %2, ptr %7, align 4, !tbaa !9
  store ptr %3, ptr %8, align 8, !tbaa !5
  %12 = load ptr, ptr %5, align 8
  call void @llvm.lifetime.start.p0(i64 8, ptr %9) #3
  %13 = getelementptr inbounds %class.Graph, ptr %12, i32 0, i32 0
  %14 = load i32, ptr %13, align 8, !tbaa !11
  %15 = sext i32 %14 to i64
  %16 = call noalias noundef nonnull ptr @_Znam(i64 noundef %15) #4
  store ptr %16, ptr %9, align 8, !tbaa !5
  call void @llvm.lifetime.start.p0(i64 4, ptr %10) #3
  store i32 0, ptr %10, align 4, !tbaa !9
  br label %17

17:                                               ; preds = %28, %4
  %18 = load i32, ptr %10, align 4, !tbaa !9
  %19 = getelementptr inbounds %class.Graph, ptr %12, i32 0, i32 0
  %20 = load i32, ptr %19, align 8, !tbaa !11
  %21 = icmp slt i32 %18, %20
  br i1 %21, label %23, label %22

22:                                               ; preds = %17
  call void @llvm.lifetime.end.p0(i64 4, ptr %10) #3
  br label %31

23:                                               ; preds = %17
  %24 = load ptr, ptr %9, align 8, !tbaa !5
  %25 = load i32, ptr %10, align 4, !tbaa !9
  %26 = sext i32 %25 to i64
  %27 = getelementptr inbounds i8, ptr %24, i64 %26
  store i8 0, ptr %27, align 1, !tbaa !13
  br label %28

28:                                               ; preds = %23
  %29 = load i32, ptr %10, align 4, !tbaa !9
  %30 = add nsw i32 %29, 1
  store i32 %30, ptr %10, align 4, !tbaa !9
  br label %17, !llvm.loop !15

31:                                               ; preds = %22
  call void @llvm.lifetime.start.p0(i64 4, ptr %11) #3
  store i32 0, ptr %11, align 4, !tbaa !9
  %32 = load i32, ptr %6, align 4, !tbaa !9
  %33 = load ptr, ptr %9, align 8, !tbaa !5
  %34 = load ptr, ptr %8, align 8, !tbaa !5
  %35 = load i32, ptr %7, align 4, !tbaa !9
  call void @_ZN5Graph7DFSUtilEiPbS0_iiPi(ptr noundef nonnull align 8 dereferenceable(16) %12, i32 noundef %32, ptr noundef %33, ptr noundef %34, i32 noundef %35, i32 noundef 0, ptr noundef %11)
  %36 = load i32, ptr %11, align 4, !tbaa !9
  call void @llvm.lifetime.end.p0(i64 4, ptr %11) #3
  call void @llvm.lifetime.end.p0(i64 8, ptr %9) #3
  ret i32 %36
}

; Function Attrs: nobuiltin allocsize(0)
declare noundef nonnull ptr @_Znam(i64 noundef) #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 = { 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 = { nounwind }
attributes #4 = { 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, !10, i64 0}
!10 = !{!"int", !7, i64 0}
!11 = !{!12, !10, i64 0}
!12 = !{!"_ZTS5Graph", !10, i64 0, !6, i64 8}
!13 = !{!14, !14, i64 0}
!14 = !{!"bool", !7, i64 0}
!15 = distinct !{!15, !16}
!16 = !{!"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 void @_ZN5Graph7DFSUtilEiPbS0_iiPi(ptr noundef nonnull align 8 dereferenceable(16), i32 noundef, ptr noundef, ptr noundef, i32 noundef, i32 noundef, ptr noundef) local_unnamed_addr #0 align 2

; 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 @_ZN5Graph3DFSEiiPb(ptr noundef nonnull align 8 dereferenceable(16) %0, i32 noundef %1, i32 noundef %2, ptr noundef %3) local_unnamed_addr #0 align 2 {
  %5 = alloca i32, align 4
  %6 = load i32, ptr %0, align 8, !tbaa !5
  %7 = sext i32 %6 to i64
  %8 = tail call noalias noundef nonnull ptr @_Znam(i64 noundef %7) #4
  %9 = icmp sgt i32 %6, 0
  br i1 %9, label %.lr.ph.preheader, label %._crit_edge

.lr.ph.preheader:                                 ; preds = %4
  %10 = zext nneg i32 %6 to i64
  tail call void @llvm.memset.p0.i64(ptr nonnull align 1 %8, i8 0, i64 %10, i1 false), !tbaa !11
  br label %._crit_edge

._crit_edge:                                      ; preds = %.lr.ph.preheader, %4
  call void @llvm.lifetime.start.p0(i64 4, ptr nonnull %5) #5
  store i32 0, ptr %5, align 4, !tbaa !13
  call void @_ZN5Graph7DFSUtilEiPbS0_iiPi(ptr noundef nonnull align 8 dereferenceable(16) %0, i32 noundef %1, ptr noundef nonnull %8, ptr noundef %3, i32 noundef %2, i32 noundef 0, ptr noundef nonnull %5)
  %11 = load i32, ptr %5, align 4, !tbaa !13
  call void @llvm.lifetime.end.p0(i64 4, ptr nonnull %5) #5
  ret i32 %11
}

; Function Attrs: nobuiltin allocsize(0)
declare noundef nonnull ptr @_Znam(i64 noundef) local_unnamed_addr #2

; Function Attrs: nocallback nofree nounwind willreturn memory(argmem: write)
declare void @llvm.memset.p0.i64(ptr nocapture writeonly, i8, i64, i1 immarg) #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 = { mustprogress 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 = { nocallback nofree nounwind willreturn memory(argmem: write) }
attributes #4 = { builtin allocsize(0) }
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, !7, i64 0}
!6 = !{!"_ZTS5Graph", !7, i64 0, !10, i64 8}
!7 = !{!"int", !8, i64 0}
!8 = !{!"omnipotent char", !9, i64 0}
!9 = !{!"Simple C++ TBAA"}
!10 = !{!"any pointer", !8, i64 0}
!11 = !{!12, !12, i64 0}
!12 = !{!"bool", !8, i64 0}
!13 = !{!7, !7, i64 0}


; Effective O3 passes: EarlyCSEPass,GVNPass,GlobalOptPass,IndVarSimplifyPass,InferFunctionAttrsPass,InstCombinePass,LoopIdiomRecognizePass,LoopRotatePass,LoopSimplifyPass,SROAPass,SimplifyCFGPass,TailCallElimPass