; LLVM IR from facebook/redex :: libredex/ControlFlow.ll (ZNK3cfg5Block17goes_to_only_edgeEv)

; 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: nocallback nofree nosync nounwind willreturn memory(argmem: readwrite)
declare void @llvm.lifetime.start.p0(i64 immarg, ptr nocapture) #0

; Function Attrs: nocallback nofree nosync nounwind willreturn memory(argmem: readwrite)
declare void @llvm.lifetime.end.p0(i64 immarg, ptr nocapture) #0

; Function Attrs: mustprogress nounwind uwtable
declare dso_local noundef nonnull align 8 dereferenceable(24) ptr @_ZNK3cfg5Block5succsEv(ptr noundef nonnull align 8 dereferenceable(104)) #1 align 2

; Function Attrs: mustprogress nounwind uwtable
declare dso_local noundef i64 @_ZNKSt6vectorIPN3cfg4EdgeESaIS2_EE4sizeEv(ptr noundef nonnull align 8 dereferenceable(24)) #1 align 2

; Function Attrs: mustprogress nounwind uwtable
declare dso_local noundef zeroext i8 @_ZNK3cfg4Edge4typeEv(ptr noundef nonnull align 8 dereferenceable(32)) #1 align 2

; Function Attrs: mustprogress uwtable
define dso_local noundef ptr @_ZNK3cfg5Block17goes_to_only_edgeEv(ptr noundef nonnull align 8 dereferenceable(104) %0) #2 align 2 {
  %2 = alloca ptr, align 8
  %3 = alloca ptr, align 8
  %4 = alloca ptr, align 8
  %5 = alloca ptr, align 8
  %6 = alloca i32, align 4
  store ptr %0, ptr %3, align 8, !tbaa !5
  %7 = load ptr, ptr %3, align 8
  call void @llvm.lifetime.start.p0(i64 8, ptr %4) #3
  %8 = call noundef nonnull align 8 dereferenceable(24) ptr @_ZNK3cfg5Block5succsEv(ptr noundef nonnull align 8 dereferenceable(104) %7)
  store ptr %8, ptr %4, align 8, !tbaa !5
  %9 = load ptr, ptr %4, align 8, !tbaa !5
  %10 = call noundef i64 @_ZNKSt6vectorIPN3cfg4EdgeESaIS2_EE4sizeEv(ptr noundef nonnull align 8 dereferenceable(24) %9) #3
  %11 = icmp eq i64 %10, 1
  br i1 %11, label %12, label %28

12:                                               ; preds = %1
  call void @llvm.lifetime.start.p0(i64 8, ptr %5) #3
  %13 = load ptr, ptr %4, align 8, !tbaa !5
  %14 = call noundef nonnull align 8 dereferenceable(8) ptr @_ZNKSt6vectorIPN3cfg4EdgeESaIS2_EEixEm(ptr noundef nonnull align 8 dereferenceable(24) %13, i64 noundef 0) #3
  store ptr %14, ptr %5, align 8, !tbaa !5
  %15 = load ptr, ptr %5, align 8, !tbaa !5
  %16 = load ptr, ptr %15, align 8, !tbaa !5
  %17 = call noundef zeroext i8 @_ZNK3cfg4Edge4typeEv(ptr noundef nonnull align 8 dereferenceable(32) %16)
  %18 = zext i8 %17 to i32
  %19 = icmp eq i32 %18, 0
  br i1 %19, label %20, label %24

20:                                               ; preds = %12
  %21 = load ptr, ptr %5, align 8, !tbaa !5
  %22 = load ptr, ptr %21, align 8, !tbaa !5
  %23 = call noundef ptr @_ZNK3cfg4Edge6targetEv(ptr noundef nonnull align 8 dereferenceable(32) %22)
  store ptr %23, ptr %2, align 8
  store i32 1, ptr %6, align 4
  br label %25

24:                                               ; preds = %12
  store i32 0, ptr %6, align 4
  br label %25

25:                                               ; preds = %24, %20
  call void @llvm.lifetime.end.p0(i64 8, ptr %5) #3
  %26 = load i32, ptr %6, align 4
  switch i32 %26, label %29 [
    i32 0, label %27
  ]

27:                                               ; preds = %25
  br label %28

28:                                               ; preds = %27, %1
  store ptr null, ptr %2, align 8
  store i32 1, ptr %6, align 4
  br label %29

29:                                               ; preds = %28, %25
  call void @llvm.lifetime.end.p0(i64 8, ptr %4) #3
  %30 = load ptr, ptr %2, align 8
  ret ptr %30
}

; Function Attrs: mustprogress nounwind uwtable
declare dso_local noundef ptr @_ZNK3cfg4Edge6targetEv(ptr noundef nonnull align 8 dereferenceable(32)) #1 align 2

; Function Attrs: mustprogress nounwind uwtable
declare dso_local noundef nonnull align 8 dereferenceable(8) ptr @_ZNKSt6vectorIPN3cfg4EdgeESaIS2_EEixEm(ptr noundef nonnull align 8 dereferenceable(24), i64 noundef) #1 align 2

attributes #0 = { nocallback nofree nosync nounwind willreturn memory(argmem: readwrite) }
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 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 = !{!"any pointer", !7, i64 0}
!7 = !{!"omnipotent char", !8, i64 0}
!8 = !{!"Simple C++ TBAA"}


; 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 nounwind uwtable
declare dso_local noundef nonnull align 8 dereferenceable(24) ptr @_ZNK3cfg5Block5succsEv(ptr noundef nonnull align 8 dereferenceable(104)) local_unnamed_addr #0 align 2

; Function Attrs: mustprogress nounwind uwtable
declare dso_local noundef i64 @_ZNKSt6vectorIPN3cfg4EdgeESaIS2_EE4sizeEv(ptr noundef nonnull align 8 dereferenceable(24)) local_unnamed_addr #0 align 2

; Function Attrs: mustprogress nounwind uwtable
declare dso_local noundef zeroext i8 @_ZNK3cfg4Edge4typeEv(ptr noundef nonnull align 8 dereferenceable(32)) local_unnamed_addr #0 align 2

; Function Attrs: mustprogress nounwind uwtable
define dso_local noundef ptr @_ZNK3cfg5Block17goes_to_only_edgeEv(ptr noundef nonnull align 8 dereferenceable(104) %0) local_unnamed_addr #0 align 2 {
  %2 = tail call noundef nonnull align 8 dereferenceable(24) ptr @_ZNK3cfg5Block5succsEv(ptr noundef nonnull align 8 dereferenceable(104) %0)
  %3 = tail call noundef i64 @_ZNKSt6vectorIPN3cfg4EdgeESaIS2_EE4sizeEv(ptr noundef nonnull align 8 dereferenceable(24) %2) #1
  %4 = icmp eq i64 %3, 1
  br i1 %4, label %5, label %11

5:                                                ; preds = %1
  %6 = tail call noundef nonnull align 8 dereferenceable(8) ptr @_ZNKSt6vectorIPN3cfg4EdgeESaIS2_EEixEm(ptr noundef nonnull align 8 dereferenceable(24) %2, i64 noundef 0) #1
  %7 = load ptr, ptr %6, align 8, !tbaa !5
  %8 = tail call noundef zeroext i8 @_ZNK3cfg4Edge4typeEv(ptr noundef nonnull align 8 dereferenceable(32) %7)
  %.not = icmp eq i8 %8, 0
  br i1 %.not, label %.thread, label %11

.thread:                                          ; preds = %5
  %9 = load ptr, ptr %6, align 8, !tbaa !5
  %10 = tail call noundef ptr @_ZNK3cfg4Edge6targetEv(ptr noundef nonnull align 8 dereferenceable(32) %9)
  br label %11

11:                                               ; preds = %1, %5, %.thread
  %.1 = phi ptr [ %10, %.thread ], [ null, %5 ], [ null, %1 ]
  ret ptr %.1
}

; Function Attrs: mustprogress nounwind uwtable
declare dso_local noundef ptr @_ZNK3cfg4Edge6targetEv(ptr noundef nonnull align 8 dereferenceable(32)) local_unnamed_addr #0 align 2

; Function Attrs: mustprogress nounwind uwtable
declare dso_local noundef nonnull align 8 dereferenceable(8) ptr @_ZNKSt6vectorIPN3cfg4EdgeESaIS2_EEixEm(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 = !{!"any pointer", !7, i64 0}
!7 = !{!"omnipotent char", !8, i64 0}
!8 = !{!"Simple C++ TBAA"}


; Effective O3 passes: GlobalOptPass,InferFunctionAttrsPass,InstCombinePass,JumpThreadingPass,PostOrderFunctionAttrsPass,SROAPass,SimplifyCFGPass,TailCallElimPass