; LLVM IR from devparthgarg/Data-Structures-and-Algorithms :: 15. Binary Tree/12 Maximum in Binary Tree/12a.ll (Z7maximumP4Node)

; 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::queue" = type { %"class.std::deque" }
%"class.std::deque" = type { %"class.std::_Deque_base" }
%"class.std::_Deque_base" = type { %"struct.std::_Deque_base<Node *, std::allocator<Node *>>::_Deque_impl" }
%"struct.std::_Deque_base<Node *, std::allocator<Node *>>::_Deque_impl" = type { %"struct.std::_Deque_base<Node *, std::allocator<Node *>>::_Deque_impl_data" }
%"struct.std::_Deque_base<Node *, std::allocator<Node *>>::_Deque_impl_data" = type { ptr, i64, %"struct.std::_Deque_iterator", %"struct.std::_Deque_iterator" }
%"struct.std::_Deque_iterator" = type { ptr, ptr, ptr, ptr }
%class.Node = type { i32, ptr, ptr }

; Function Attrs: mustprogress uwtable
define dso_local noundef i32 @_Z7maximumP4Node(ptr noundef %0) #0 personality ptr @__gxx_personality_v0 {
  %2 = alloca i32, align 4
  %3 = alloca ptr, align 8
  %4 = alloca i32, align 4
  %5 = alloca %"class.std::queue", align 8
  %6 = alloca ptr, align 8
  %7 = alloca i32, align 4
  %8 = alloca ptr, align 8
  store ptr %0, ptr %3, align 8, !tbaa !5
  %9 = load ptr, ptr %3, align 8, !tbaa !5
  %10 = icmp eq ptr %9, null
  br i1 %10, label %11, label %12

11:                                               ; preds = %1
  store i32 0, ptr %2, align 4
  br label %62

12:                                               ; preds = %1
  call void @llvm.lifetime.start.p0(i64 4, ptr %4) #4
  store i32 -2147483648, ptr %4, align 4, !tbaa !9
  call void @llvm.lifetime.start.p0(i64 80, ptr %5) #4
  call void @_ZNSt5queueIP4NodeSt5dequeIS1_SaIS1_EEEC2IS4_vEEv(ptr noundef nonnull align 8 dereferenceable(80) %5)
  invoke void @_ZNSt5queueIP4NodeSt5dequeIS1_SaIS1_EEE4pushERKS1_(ptr noundef nonnull align 8 dereferenceable(80) %5, ptr noundef nonnull align 8 dereferenceable(8) %3)
          to label %13 unwind label %32

13:                                               ; preds = %12
  br label %14

14:                                               ; preds = %58, %13
  %15 = invoke noundef zeroext i1 @_ZNKSt5queueIP4NodeSt5dequeIS1_SaIS1_EEE5emptyEv(ptr noundef nonnull align 8 dereferenceable(80) %5)
          to label %16 unwind label %32

16:                                               ; preds = %14
  %17 = zext i1 %15 to i32
  %18 = icmp eq i32 %17, 0
  br i1 %18, label %19, label %59

19:                                               ; preds = %16
  call void @llvm.lifetime.start.p0(i64 8, ptr %8) #4
  %20 = invoke noundef nonnull align 8 dereferenceable(8) ptr @_ZNSt5queueIP4NodeSt5dequeIS1_SaIS1_EEE5frontEv(ptr noundef nonnull align 8 dereferenceable(80) %5)
          to label %21 unwind label %36

21:                                               ; preds = %19
  %22 = load ptr, ptr %20, align 8, !tbaa !5
  store ptr %22, ptr %8, align 8, !tbaa !5
  invoke void @_ZNSt5queueIP4NodeSt5dequeIS1_SaIS1_EEE3popEv(ptr noundef nonnull align 8 dereferenceable(80) %5)
          to label %23 unwind label %36

23:                                               ; preds = %21
  %24 = load ptr, ptr %8, align 8, !tbaa !5
  %25 = icmp ne ptr %24, null
  br i1 %25, label %26, label %40

26:                                               ; preds = %23
  %27 = load ptr, ptr %8, align 8, !tbaa !5
  %28 = getelementptr inbounds %class.Node, ptr %27, i32 0, i32 0
  %29 = invoke noundef nonnull align 4 dereferenceable(4) ptr @_ZSt3maxIiERKT_S2_S2_(ptr noundef nonnull align 4 dereferenceable(4) %4, ptr noundef nonnull align 4 dereferenceable(4) %28)
          to label %30 unwind label %36

30:                                               ; preds = %26
  %31 = load i32, ptr %29, align 4, !tbaa !9
  store i32 %31, ptr %4, align 4, !tbaa !9
  br label %40

32:                                               ; preds = %14, %12
  %33 = landingpad { ptr, i32 }
          cleanup
  %34 = extractvalue { ptr, i32 } %33, 0
  store ptr %34, ptr %6, align 8
  %35 = extractvalue { ptr, i32 } %33, 1
  store i32 %35, ptr %7, align 4
  br label %61

36:                                               ; preds = %54, %45, %26, %21, %19
  %37 = landingpad { ptr, i32 }
          cleanup
  %38 = extractvalue { ptr, i32 } %37, 0
  store ptr %38, ptr %6, align 8
  %39 = extractvalue { ptr, i32 } %37, 1
  store i32 %39, ptr %7, align 4
  call void @llvm.lifetime.end.p0(i64 8, ptr %8) #4
  br label %61

40:                                               ; preds = %30, %23
  %41 = load ptr, ptr %8, align 8, !tbaa !5
  %42 = getelementptr inbounds %class.Node, ptr %41, i32 0, i32 1
  %43 = load ptr, ptr %42, align 8, !tbaa !11
  %44 = icmp ne ptr %43, null
  br i1 %44, label %45, label %49

45:                                               ; preds = %40
  %46 = load ptr, ptr %8, align 8, !tbaa !5
  %47 = getelementptr inbounds %class.Node, ptr %46, i32 0, i32 1
  invoke void @_ZNSt5queueIP4NodeSt5dequeIS1_SaIS1_EEE4pushERKS1_(ptr noundef nonnull align 8 dereferenceable(80) %5, ptr noundef nonnull align 8 dereferenceable(8) %47)
          to label %48 unwind label %36

48:                                               ; preds = %45
  br label %49

49:                                               ; preds = %48, %40
  %50 = load ptr, ptr %8, align 8, !tbaa !5
  %51 = getelementptr inbounds %class.Node, ptr %50, i32 0, i32 2
  %52 = load ptr, ptr %51, align 8, !tbaa !13
  %53 = icmp ne ptr %52, null
  br i1 %53, label %54, label %58

54:                                               ; preds = %49
  %55 = load ptr, ptr %8, align 8, !tbaa !5
  %56 = getelementptr inbounds %class.Node, ptr %55, i32 0, i32 2
  invoke void @_ZNSt5queueIP4NodeSt5dequeIS1_SaIS1_EEE4pushERKS1_(ptr noundef nonnull align 8 dereferenceable(80) %5, ptr noundef nonnull align 8 dereferenceable(8) %56)
          to label %57 unwind label %36

57:                                               ; preds = %54
  br label %58

58:                                               ; preds = %57, %49
  call void @llvm.lifetime.end.p0(i64 8, ptr %8) #4
  br label %14, !llvm.loop !14

59:                                               ; preds = %16
  %60 = load i32, ptr %4, align 4, !tbaa !9
  store i32 %60, ptr %2, align 4
  call void @_ZNSt5queueIP4NodeSt5dequeIS1_SaIS1_EEED2Ev(ptr noundef nonnull align 8 dereferenceable(80) %5) #4
  call void @llvm.lifetime.end.p0(i64 80, ptr %5) #4
  call void @llvm.lifetime.end.p0(i64 4, ptr %4) #4
  br label %62

61:                                               ; preds = %36, %32
  call void @_ZNSt5queueIP4NodeSt5dequeIS1_SaIS1_EEED2Ev(ptr noundef nonnull align 8 dereferenceable(80) %5) #4
  call void @llvm.lifetime.end.p0(i64 80, ptr %5) #4
  call void @llvm.lifetime.end.p0(i64 4, ptr %4) #4
  br label %64

62:                                               ; preds = %59, %11
  %63 = load i32, ptr %2, align 4
  ret i32 %63

64:                                               ; preds = %61
  %65 = load ptr, ptr %6, align 8
  %66 = load i32, ptr %7, align 4
  %67 = insertvalue { ptr, i32 } poison, ptr %65, 0
  %68 = insertvalue { ptr, i32 } %67, i32 %66, 1
  resume { ptr, i32 } %68
}

; Function Attrs: nocallback nofree nosync nounwind willreturn memory(argmem: readwrite)
declare void @llvm.lifetime.start.p0(i64 immarg, ptr nocapture) #1

; Function Attrs: mustprogress uwtable
declare dso_local void @_ZNSt5queueIP4NodeSt5dequeIS1_SaIS1_EEEC2IS4_vEEv(ptr noundef nonnull align 8 dereferenceable(80)) unnamed_addr #0 align 2

; Function Attrs: mustprogress uwtable
declare dso_local void @_ZNSt5queueIP4NodeSt5dequeIS1_SaIS1_EEE4pushERKS1_(ptr noundef nonnull align 8 dereferenceable(80), ptr noundef nonnull align 8 dereferenceable(8)) #0 align 2

declare i32 @__gxx_personality_v0(...)

; Function Attrs: mustprogress nounwind uwtable
declare dso_local noundef zeroext i1 @_ZNKSt5queueIP4NodeSt5dequeIS1_SaIS1_EEE5emptyEv(ptr noundef nonnull align 8 dereferenceable(80)) #2 align 2

; Function Attrs: mustprogress nounwind uwtable
declare dso_local noundef nonnull align 8 dereferenceable(8) ptr @_ZNSt5queueIP4NodeSt5dequeIS1_SaIS1_EEE5frontEv(ptr noundef nonnull align 8 dereferenceable(80)) #2 align 2

; Function Attrs: mustprogress nounwind uwtable
declare dso_local void @_ZNSt5queueIP4NodeSt5dequeIS1_SaIS1_EEE3popEv(ptr noundef nonnull align 8 dereferenceable(80)) #2 align 2

; Function Attrs: inlinehint mustprogress nounwind uwtable
declare dso_local noundef nonnull align 4 dereferenceable(4) ptr @_ZSt3maxIiERKT_S2_S2_(ptr noundef nonnull align 4 dereferenceable(4), ptr noundef nonnull align 4 dereferenceable(4)) #3

; Function Attrs: nocallback nofree nosync nounwind willreturn memory(argmem: readwrite)
declare void @llvm.lifetime.end.p0(i64 immarg, ptr nocapture) #1

; Function Attrs: inlinehint mustprogress nounwind uwtable
declare dso_local void @_ZNSt5queueIP4NodeSt5dequeIS1_SaIS1_EEED2Ev(ptr noundef nonnull align 8 dereferenceable(80)) 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 = !{!"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, !6, i64 8}
!12 = !{!"_ZTS4Node", !10, i64 0, !6, i64 8, !6, i64 16}
!13 = !{!12, !6, i64 16}
!14 = distinct !{!14, !15}
!15 = !{!"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::queue" = type { %"class.std::deque" }
%"class.std::deque" = type { %"class.std::_Deque_base" }
%"class.std::_Deque_base" = type { %"struct.std::_Deque_base<Node *, std::allocator<Node *>>::_Deque_impl" }
%"struct.std::_Deque_base<Node *, std::allocator<Node *>>::_Deque_impl" = type { %"struct.std::_Deque_base<Node *, std::allocator<Node *>>::_Deque_impl_data" }
%"struct.std::_Deque_base<Node *, std::allocator<Node *>>::_Deque_impl_data" = type { ptr, i64, %"struct.std::_Deque_iterator", %"struct.std::_Deque_iterator" }
%"struct.std::_Deque_iterator" = type { ptr, ptr, ptr, ptr }

; Function Attrs: mustprogress uwtable
define dso_local noundef i32 @_Z7maximumP4Node(ptr noundef %0) local_unnamed_addr #0 personality ptr @__gxx_personality_v0 {
  %2 = alloca ptr, align 8
  %3 = alloca i32, align 4
  %4 = alloca %"class.std::queue", align 8
  store ptr %0, ptr %2, align 8, !tbaa !5
  %5 = icmp eq ptr %0, null
  br i1 %5, label %29, label %6

6:                                                ; preds = %1
  call void @llvm.lifetime.start.p0(i64 4, ptr nonnull %3) #4
  store i32 -2147483648, ptr %3, align 4, !tbaa !9
  call void @llvm.lifetime.start.p0(i64 80, ptr nonnull %4) #4
  call void @_ZNSt5queueIP4NodeSt5dequeIS1_SaIS1_EEEC2IS4_vEEv(ptr noundef nonnull align 8 dereferenceable(80) %4)
  invoke void @_ZNSt5queueIP4NodeSt5dequeIS1_SaIS1_EEE4pushERKS1_(ptr noundef nonnull align 8 dereferenceable(80) %4, ptr noundef nonnull align 8 dereferenceable(8) %2)
          to label %.preheader unwind label %13

.preheader:                                       ; preds = %6
  %7 = call noundef zeroext i1 @_ZNKSt5queueIP4NodeSt5dequeIS1_SaIS1_EEE5emptyEv(ptr noundef nonnull align 8 dereferenceable(80) %4)
  br i1 %7, label %._crit_edge, label %.lr.ph

.lr.ph:                                           ; preds = %.preheader, %25
  %8 = call noundef nonnull align 8 dereferenceable(8) ptr @_ZNSt5queueIP4NodeSt5dequeIS1_SaIS1_EEE5frontEv(ptr noundef nonnull align 8 dereferenceable(80) %4)
  %9 = load ptr, ptr %8, align 8, !tbaa !5
  call void @_ZNSt5queueIP4NodeSt5dequeIS1_SaIS1_EEE3popEv(ptr noundef nonnull align 8 dereferenceable(80) %4)
  %.not = icmp eq ptr %9, null
  br i1 %.not, label %17, label %10

10:                                               ; preds = %.lr.ph
  %11 = call noundef nonnull align 4 dereferenceable(4) ptr @_ZSt3maxIiERKT_S2_S2_(ptr noundef nonnull align 4 dereferenceable(4) %3, ptr noundef nonnull align 4 dereferenceable(4) %9)
  %12 = load i32, ptr %11, align 4, !tbaa !9
  store i32 %12, ptr %3, align 4, !tbaa !9
  br label %17

13:                                               ; preds = %6
  %14 = landingpad { ptr, i32 }
          cleanup
  br label %28

15:                                               ; preds = %24, %20
  %16 = landingpad { ptr, i32 }
          cleanup
  br label %28

17:                                               ; preds = %10, %.lr.ph
  %18 = getelementptr inbounds i8, ptr %9, i64 8
  %19 = load ptr, ptr %18, align 8, !tbaa !11
  %.not11 = icmp eq ptr %19, null
  br i1 %.not11, label %21, label %20

20:                                               ; preds = %17
  invoke void @_ZNSt5queueIP4NodeSt5dequeIS1_SaIS1_EEE4pushERKS1_(ptr noundef nonnull align 8 dereferenceable(80) %4, ptr noundef nonnull align 8 dereferenceable(8) %18)
          to label %21 unwind label %15

21:                                               ; preds = %20, %17
  %22 = getelementptr inbounds i8, ptr %9, i64 16
  %23 = load ptr, ptr %22, align 8, !tbaa !13
  %.not12 = icmp eq ptr %23, null
  br i1 %.not12, label %25, label %24

24:                                               ; preds = %21
  invoke void @_ZNSt5queueIP4NodeSt5dequeIS1_SaIS1_EEE4pushERKS1_(ptr noundef nonnull align 8 dereferenceable(80) %4, ptr noundef nonnull align 8 dereferenceable(8) %22)
          to label %25 unwind label %15

25:                                               ; preds = %24, %21
  %26 = call noundef zeroext i1 @_ZNKSt5queueIP4NodeSt5dequeIS1_SaIS1_EEE5emptyEv(ptr noundef nonnull align 8 dereferenceable(80) %4)
  br i1 %26, label %._crit_edge.loopexit, label %.lr.ph, !llvm.loop !14

._crit_edge.loopexit:                             ; preds = %25
  %.pre = load i32, ptr %3, align 4, !tbaa !9
  br label %._crit_edge

._crit_edge:                                      ; preds = %._crit_edge.loopexit, %.preheader
  %27 = phi i32 [ %.pre, %._crit_edge.loopexit ], [ -2147483648, %.preheader ]
  call void @_ZNSt5queueIP4NodeSt5dequeIS1_SaIS1_EEED2Ev(ptr noundef nonnull align 8 dereferenceable(80) %4) #4
  call void @llvm.lifetime.end.p0(i64 80, ptr nonnull %4) #4
  call void @llvm.lifetime.end.p0(i64 4, ptr nonnull %3) #4
  br label %29

28:                                               ; preds = %15, %13
  %.pn = phi { ptr, i32 } [ %16, %15 ], [ %14, %13 ]
  call void @_ZNSt5queueIP4NodeSt5dequeIS1_SaIS1_EEED2Ev(ptr noundef nonnull align 8 dereferenceable(80) %4) #4
  call void @llvm.lifetime.end.p0(i64 80, ptr nonnull %4) #4
  call void @llvm.lifetime.end.p0(i64 4, ptr nonnull %3) #4
  resume { ptr, i32 } %.pn

29:                                               ; preds = %1, %._crit_edge
  %.0 = phi i32 [ %27, %._crit_edge ], [ 0, %1 ]
  ret i32 %.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 uwtable
declare dso_local void @_ZNSt5queueIP4NodeSt5dequeIS1_SaIS1_EEEC2IS4_vEEv(ptr noundef nonnull align 8 dereferenceable(80)) unnamed_addr #0 align 2

; Function Attrs: mustprogress uwtable
declare dso_local void @_ZNSt5queueIP4NodeSt5dequeIS1_SaIS1_EEE4pushERKS1_(ptr noundef nonnull align 8 dereferenceable(80), ptr noundef nonnull align 8 dereferenceable(8)) local_unnamed_addr #0 align 2

declare i32 @__gxx_personality_v0(...)

; Function Attrs: mustprogress nounwind uwtable
declare dso_local noundef zeroext i1 @_ZNKSt5queueIP4NodeSt5dequeIS1_SaIS1_EEE5emptyEv(ptr noundef nonnull align 8 dereferenceable(80)) local_unnamed_addr #2 align 2

; Function Attrs: mustprogress nounwind uwtable
declare dso_local noundef nonnull align 8 dereferenceable(8) ptr @_ZNSt5queueIP4NodeSt5dequeIS1_SaIS1_EEE5frontEv(ptr noundef nonnull align 8 dereferenceable(80)) local_unnamed_addr #2 align 2

; Function Attrs: mustprogress nounwind uwtable
declare dso_local void @_ZNSt5queueIP4NodeSt5dequeIS1_SaIS1_EEE3popEv(ptr noundef nonnull align 8 dereferenceable(80)) local_unnamed_addr #2 align 2

; Function Attrs: inlinehint mustprogress nounwind uwtable
declare dso_local noundef nonnull align 4 dereferenceable(4) ptr @_ZSt3maxIiERKT_S2_S2_(ptr noundef nonnull align 4 dereferenceable(4), ptr noundef nonnull align 4 dereferenceable(4)) local_unnamed_addr #3

; Function Attrs: mustprogress nocallback nofree nosync nounwind willreturn memory(argmem: readwrite)
declare void @llvm.lifetime.end.p0(i64 immarg, ptr nocapture) #1

; Function Attrs: inlinehint mustprogress nounwind uwtable
declare dso_local void @_ZNSt5queueIP4NodeSt5dequeIS1_SaIS1_EEED2Ev(ptr noundef nonnull align 8 dereferenceable(80)) 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 = !{!"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, !6, i64 8}
!12 = !{!"_ZTS4Node", !10, i64 0, !6, i64 8, !6, i64 16}
!13 = !{!12, !6, i64 16}
!14 = distinct !{!14, !15}
!15 = !{!"llvm.loop.mustprogress"}


; Effective O3 passes: EarlyCSEPass,GVNPass,GlobalOptPass,InferFunctionAttrsPass,InstCombinePass,LoopRotatePass,LoopSimplifyPass,LoopUnrollPass,SROAPass,SimplifyCFGPass