; LLVM IR from kazunetakahashi/atcoder :: 2017/1111_ARC085 (E2)

; 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::basic_istream" = type { ptr, i64, %"class.std::basic_ios" }
%"class.std::basic_ios" = type { %"class.std::ios_base", ptr, i8, i8, ptr, ptr, ptr, ptr }
%"class.std::ios_base" = type { ptr, i64, i64, i32, i32, i32, ptr, %"struct.std::ios_base::_Words", [8 x %"struct.std::ios_base::_Words"], i32, ptr, %"class.std::locale" }
%"struct.std::ios_base::_Words" = type { ptr, i64 }
%"class.std::locale" = type { ptr }
%"class.std::basic_ostream" = type { ptr, %"class.std::basic_ios" }

@N = external dso_local global i32, align 4
@a = external dso_local global [110 x i32], align 16
@_ZSt3cin = external global %"class.std::basic_istream", align 8
@_ZSt4cout = external global %"class.std::basic_ostream", align 8

; Function Attrs: mustprogress uwtable
declare dso_local void @_Z8add_edgeiix(i32 noundef, i32 noundef, i64 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: nocallback nofree nosync nounwind willreturn memory(argmem: readwrite)
declare void @llvm.lifetime.end.p0(i64 immarg, ptr nocapture) #1

; Function Attrs: mustprogress uwtable
declare dso_local noundef i64 @_Z8max_flowii(i32 noundef, i32 noundef) #0

; Function Attrs: mustprogress norecurse uwtable
define dso_local noundef i32 @main() #2 {
  %1 = alloca i32, align 4
  %2 = alloca i32, align 4
  %3 = alloca i32, align 4
  %4 = alloca i32, align 4
  %5 = alloca i32, align 4
  %6 = alloca i64, align 8
  %7 = alloca i32, align 4
  store i32 0, ptr %1, align 4
  %8 = call noundef nonnull align 8 dereferenceable(16) ptr @_ZNSirsERi(ptr noundef nonnull align 8 dereferenceable(16) @_ZSt3cin, ptr noundef nonnull align 4 dereferenceable(4) @N)
  call void @llvm.lifetime.start.p0(i64 4, ptr %2) #5
  store i32 1, ptr %2, align 4, !tbaa !5
  br label %9

9:                                                ; preds = %19, %0
  %10 = load i32, ptr %2, align 4, !tbaa !5
  %11 = load i32, ptr @N, align 4, !tbaa !5
  %12 = icmp sle i32 %10, %11
  br i1 %12, label %14, label %13

13:                                               ; preds = %9
  call void @llvm.lifetime.end.p0(i64 4, ptr %2) #5
  br label %22

14:                                               ; preds = %9
  %15 = load i32, ptr %2, align 4, !tbaa !5
  %16 = sext i32 %15 to i64
  %17 = getelementptr inbounds [110 x i32], ptr @a, i64 0, i64 %16
  %18 = call noundef nonnull align 8 dereferenceable(16) ptr @_ZNSirsERi(ptr noundef nonnull align 8 dereferenceable(16) @_ZSt3cin, ptr noundef nonnull align 4 dereferenceable(4) %17)
  br label %19

19:                                               ; preds = %14
  %20 = load i32, ptr %2, align 4, !tbaa !5
  %21 = add nsw i32 %20, 1
  store i32 %21, ptr %2, align 4, !tbaa !5
  br label %9, !llvm.loop !9

22:                                               ; preds = %13
  call void @llvm.lifetime.start.p0(i64 4, ptr %3) #5
  store i32 1, ptr %3, align 4, !tbaa !5
  br label %23

23:                                               ; preds = %45, %22
  %24 = load i32, ptr %3, align 4, !tbaa !5
  %25 = load i32, ptr @N, align 4, !tbaa !5
  %26 = icmp sle i32 %24, %25
  br i1 %26, label %28, label %27

27:                                               ; preds = %23
  store i32 5, ptr %4, align 4
  call void @llvm.lifetime.end.p0(i64 4, ptr %3) #5
  br label %48

28:                                               ; preds = %23
  call void @llvm.lifetime.start.p0(i64 4, ptr %5) #5
  store i32 2, ptr %5, align 4, !tbaa !5
  br label %29

29:                                               ; preds = %41, %28
  %30 = load i32, ptr %3, align 4, !tbaa !5
  %31 = load i32, ptr %5, align 4, !tbaa !5
  %32 = mul nsw i32 %30, %31
  %33 = load i32, ptr @N, align 4, !tbaa !5
  %34 = icmp sle i32 %32, %33
  br i1 %34, label %36, label %35

35:                                               ; preds = %29
  store i32 8, ptr %4, align 4
  call void @llvm.lifetime.end.p0(i64 4, ptr %5) #5
  br label %44

36:                                               ; preds = %29
  %37 = load i32, ptr %3, align 4, !tbaa !5
  %38 = load i32, ptr %3, align 4, !tbaa !5
  %39 = load i32, ptr %5, align 4, !tbaa !5
  %40 = mul nsw i32 %38, %39
  call void @_Z8add_edgeiix(i32 noundef %37, i32 noundef %40, i64 noundef 100000000000007)
  br label %41

41:                                               ; preds = %36
  %42 = load i32, ptr %5, align 4, !tbaa !5
  %43 = add nsw i32 %42, 1
  store i32 %43, ptr %5, align 4, !tbaa !5
  br label %29, !llvm.loop !11

44:                                               ; preds = %35
  br label %45

45:                                               ; preds = %44
  %46 = load i32, ptr %3, align 4, !tbaa !5
  %47 = add nsw i32 %46, 1
  store i32 %47, ptr %3, align 4, !tbaa !5
  br label %23, !llvm.loop !12

48:                                               ; preds = %27
  call void @llvm.lifetime.start.p0(i64 8, ptr %6) #5
  store i64 0, ptr %6, align 8, !tbaa !13
  call void @llvm.lifetime.start.p0(i64 4, ptr %7) #5
  store i32 1, ptr %7, align 4, !tbaa !5
  br label %49

49:                                               ; preds = %90, %48
  %50 = load i32, ptr %7, align 4, !tbaa !5
  %51 = load i32, ptr @N, align 4, !tbaa !5
  %52 = icmp sle i32 %50, %51
  br i1 %52, label %54, label %53

53:                                               ; preds = %49
  store i32 11, ptr %4, align 4
  call void @llvm.lifetime.end.p0(i64 4, ptr %7) #5
  br label %93

54:                                               ; preds = %49
  %55 = load i32, ptr %7, align 4, !tbaa !5
  %56 = sext i32 %55 to i64
  %57 = getelementptr inbounds [110 x i32], ptr @a, i64 0, i64 %56
  %58 = load i32, ptr %57, align 4, !tbaa !5
  %59 = icmp sgt i32 %58, 0
  br i1 %59, label %60, label %74

60:                                               ; preds = %54
  %61 = load i32, ptr %7, align 4, !tbaa !5
  %62 = load i32, ptr %7, align 4, !tbaa !5
  %63 = sext i32 %62 to i64
  %64 = getelementptr inbounds [110 x i32], ptr @a, i64 0, i64 %63
  %65 = load i32, ptr %64, align 4, !tbaa !5
  %66 = sext i32 %65 to i64
  call void @_Z8add_edgeiix(i32 noundef %61, i32 noundef 101, i64 noundef %66)
  %67 = load i32, ptr %7, align 4, !tbaa !5
  %68 = sext i32 %67 to i64
  %69 = getelementptr inbounds [110 x i32], ptr @a, i64 0, i64 %68
  %70 = load i32, ptr %69, align 4, !tbaa !5
  %71 = sext i32 %70 to i64
  %72 = load i64, ptr %6, align 8, !tbaa !13
  %73 = add nsw i64 %72, %71
  store i64 %73, ptr %6, align 8, !tbaa !13
  br label %89

74:                                               ; preds = %54
  %75 = load i32, ptr %7, align 4, !tbaa !5
  %76 = sext i32 %75 to i64
  %77 = getelementptr inbounds [110 x i32], ptr @a, i64 0, i64 %76
  %78 = load i32, ptr %77, align 4, !tbaa !5
  %79 = icmp slt i32 %78, 0
  br i1 %79, label %80, label %88

80:                                               ; preds = %74
  %81 = load i32, ptr %7, align 4, !tbaa !5
  %82 = load i32, ptr %7, align 4, !tbaa !5
  %83 = sext i32 %82 to i64
  %84 = getelementptr inbounds [110 x i32], ptr @a, i64 0, i64 %83
  %85 = load i32, ptr %84, align 4, !tbaa !5
  %86 = sub nsw i32 0, %85
  %87 = sext i32 %86 to i64
  call void @_Z8add_edgeiix(i32 noundef 0, i32 noundef %81, i64 noundef %87)
  br label %88

88:                                               ; preds = %80, %74
  br label %89

89:                                               ; preds = %88, %60
  br label %90

90:                                               ; preds = %89
  %91 = load i32, ptr %7, align 4, !tbaa !5
  %92 = add nsw i32 %91, 1
  store i32 %92, ptr %7, align 4, !tbaa !5
  br label %49, !llvm.loop !15

93:                                               ; preds = %53
  %94 = load i64, ptr %6, align 8, !tbaa !13
  %95 = call noundef i64 @_Z8max_flowii(i32 noundef 0, i32 noundef 101)
  %96 = sub nsw i64 %94, %95
  %97 = call noundef nonnull align 8 dereferenceable(8) ptr @_ZNSolsEx(ptr noundef nonnull align 8 dereferenceable(8) @_ZSt4cout, i64 noundef %96)
  %98 = call noundef nonnull align 8 dereferenceable(8) ptr @_ZNSolsEPFRSoS_E(ptr noundef nonnull align 8 dereferenceable(8) %97, ptr noundef @_ZSt4endlIcSt11char_traitsIcEERSt13basic_ostreamIT_T0_ES6_)
  call void @llvm.lifetime.end.p0(i64 8, ptr %6) #5
  %99 = load i32, ptr %1, align 4
  ret i32 %99
}

declare noundef nonnull align 8 dereferenceable(16) ptr @_ZNSirsERi(ptr noundef nonnull align 8 dereferenceable(16), ptr noundef nonnull align 4 dereferenceable(4)) #3

; Function Attrs: mustprogress uwtable
declare noundef nonnull align 8 dereferenceable(8) ptr @_ZNSolsEx(ptr noundef nonnull align 8 dereferenceable(8), i64 noundef) #0 align 2

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

; Function Attrs: inlinehint mustprogress uwtable
declare noundef nonnull align 8 dereferenceable(8) ptr @_ZSt4endlIcSt11char_traitsIcEERSt13basic_ostreamIT_T0_ES6_(ptr noundef nonnull align 8 dereferenceable(8)) #4

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 norecurse 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 = { "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 = { inlinehint 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 #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 = !{!"int", !7, i64 0}
!7 = !{!"omnipotent char", !8, i64 0}
!8 = !{!"Simple C++ TBAA"}
!9 = distinct !{!9, !10}
!10 = !{!"llvm.loop.mustprogress"}
!11 = distinct !{!11, !10}
!12 = distinct !{!12, !10}
!13 = !{!14, !14, i64 0}
!14 = !{!"long long", !7, i64 0}
!15 = distinct !{!15, !10}


; 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::basic_istream" = type { ptr, i64, %"class.std::basic_ios" }
%"class.std::basic_ios" = type { %"class.std::ios_base", ptr, i8, i8, ptr, ptr, ptr, ptr }
%"class.std::ios_base" = type { ptr, i64, i64, i32, i32, i32, ptr, %"struct.std::ios_base::_Words", [8 x %"struct.std::ios_base::_Words"], i32, ptr, %"class.std::locale" }
%"struct.std::ios_base::_Words" = type { ptr, i64 }
%"class.std::locale" = type { ptr }
%"class.std::basic_ostream" = type { ptr, %"class.std::basic_ios" }

@N = external dso_local global i32, align 4
@a = external dso_local global [110 x i32], align 16
@_ZSt3cin = external global %"class.std::basic_istream", align 8
@_ZSt4cout = external global %"class.std::basic_ostream", align 8

; Function Attrs: mustprogress uwtable
declare dso_local void @_Z8add_edgeiix(i32 noundef, i32 noundef, i64 noundef) local_unnamed_addr #0

; Function Attrs: mustprogress uwtable
declare dso_local noundef i64 @_Z8max_flowii(i32 noundef, i32 noundef) local_unnamed_addr #0

; Function Attrs: mustprogress norecurse uwtable
define dso_local noundef i32 @main() local_unnamed_addr #1 {
  %1 = tail call noundef nonnull align 8 dereferenceable(16) ptr @_ZNSirsERi(ptr noundef nonnull align 8 dereferenceable(16) @_ZSt3cin, ptr noundef nonnull align 4 dereferenceable(4) @N)
  %2 = load i32, ptr @N, align 4, !tbaa !5
  %.not35 = icmp slt i32 %2, 1
  br i1 %.not35, label %._crit_edge46, label %.lr.ph

.preheader34:                                     ; preds = %.lr.ph
  %.not3040 = icmp slt i32 %5, 1
  br i1 %.not3040, label %._crit_edge46, label %.preheader33

.lr.ph:                                           ; preds = %0, %.lr.ph
  %indvars.iv = phi i64 [ %indvars.iv.next, %.lr.ph ], [ 1, %0 ]
  %3 = getelementptr inbounds [110 x i32], ptr @a, i64 0, i64 %indvars.iv
  %4 = tail call noundef nonnull align 8 dereferenceable(16) ptr @_ZNSirsERi(ptr noundef nonnull align 8 dereferenceable(16) @_ZSt3cin, ptr noundef nonnull align 4 dereferenceable(4) %3)
  %indvars.iv.next = add nuw nsw i64 %indvars.iv, 1
  %5 = load i32, ptr @N, align 4, !tbaa !5
  %6 = sext i32 %5 to i64
  %.not.not = icmp slt i64 %indvars.iv, %6
  br i1 %.not.not, label %.lr.ph, label %.preheader34, !llvm.loop !9

.preheader33:                                     ; preds = %.preheader34, %._crit_edge
  %7 = phi i32 [ %10, %._crit_edge ], [ %5, %.preheader34 ]
  %.02541 = phi i32 [ %11, %._crit_edge ], [ 1, %.preheader34 ]
  %8 = shl nuw nsw i32 %.02541, 1
  %.not3237 = icmp sgt i32 %8, %7
  br i1 %.not3237, label %._crit_edge, label %.lr.ph39

.preheader:                                       ; preds = %._crit_edge
  %9 = icmp slt i32 %10, 1
  br i1 %9, label %._crit_edge46, label %.lr.ph45

._crit_edge:                                      ; preds = %.lr.ph39, %.preheader33
  %10 = phi i32 [ %7, %.preheader33 ], [ %15, %.lr.ph39 ]
  %11 = add nuw nsw i32 %.02541, 1
  %.not30.not = icmp slt i32 %.02541, %10
  br i1 %.not30.not, label %.preheader33, label %.preheader, !llvm.loop !11

.lr.ph39:                                         ; preds = %.preheader33, %.lr.ph39
  %12 = phi i32 [ %14, %.lr.ph39 ], [ %8, %.preheader33 ]
  %.02438 = phi i32 [ %13, %.lr.ph39 ], [ 2, %.preheader33 ]
  tail call void @_Z8add_edgeiix(i32 noundef %.02541, i32 noundef %12, i64 noundef 100000000000007)
  %13 = add nuw nsw i32 %.02438, 1
  %14 = mul nuw nsw i32 %13, %.02541
  %15 = load i32, ptr @N, align 4, !tbaa !5
  %.not32 = icmp sgt i32 %14, %15
  br i1 %.not32, label %._crit_edge, label %.lr.ph39, !llvm.loop !12

._crit_edge46:                                    ; preds = %35, %0, %.preheader34, %.preheader
  %.023.lcssa = phi i64 [ 0, %.preheader ], [ 0, %.preheader34 ], [ 0, %0 ], [ %.1, %35 ]
  %16 = tail call noundef i64 @_Z8max_flowii(i32 noundef 0, i32 noundef 101)
  %17 = sub nsw i64 %.023.lcssa, %16
  %18 = tail call noundef nonnull align 8 dereferenceable(8) ptr @_ZNSolsEx(ptr noundef nonnull align 8 dereferenceable(8) @_ZSt4cout, i64 noundef %17)
  %19 = tail call noundef nonnull align 8 dereferenceable(8) ptr @_ZNSolsEPFRSoS_E(ptr noundef nonnull align 8 dereferenceable(8) %18, ptr noundef nonnull @_ZSt4endlIcSt11char_traitsIcEERSt13basic_ostreamIT_T0_ES6_)
  ret i32 0

.lr.ph45:                                         ; preds = %.preheader, %35
  %indvars.iv48 = phi i64 [ %indvars.iv.next49, %35 ], [ 1, %.preheader ]
  %.02343 = phi i64 [ %.1, %35 ], [ 0, %.preheader ]
  %20 = getelementptr inbounds [110 x i32], ptr @a, i64 0, i64 %indvars.iv48
  %21 = load i32, ptr %20, align 4, !tbaa !5
  %22 = icmp sgt i32 %21, 0
  br i1 %22, label %23, label %29

23:                                               ; preds = %.lr.ph45
  %24 = zext nneg i32 %21 to i64
  %25 = trunc nuw nsw i64 %indvars.iv48 to i32
  tail call void @_Z8add_edgeiix(i32 noundef %25, i32 noundef 101, i64 noundef %24)
  %26 = load i32, ptr %20, align 4, !tbaa !5
  %27 = sext i32 %26 to i64
  %28 = add nsw i64 %.02343, %27
  br label %35

29:                                               ; preds = %.lr.ph45
  %30 = icmp slt i32 %21, 0
  br i1 %30, label %31, label %35

31:                                               ; preds = %29
  %32 = sub nsw i32 0, %21
  %33 = zext nneg i32 %32 to i64
  %34 = trunc nuw nsw i64 %indvars.iv48 to i32
  tail call void @_Z8add_edgeiix(i32 noundef 0, i32 noundef %34, i64 noundef %33)
  br label %35

35:                                               ; preds = %23, %31, %29
  %.1 = phi i64 [ %28, %23 ], [ %.02343, %31 ], [ %.02343, %29 ]
  %indvars.iv.next49 = add nuw nsw i64 %indvars.iv48, 1
  %36 = load i32, ptr @N, align 4, !tbaa !5
  %37 = sext i32 %36 to i64
  %.not31.not = icmp slt i64 %indvars.iv48, %37
  br i1 %.not31.not, label %.lr.ph45, label %._crit_edge46, !llvm.loop !13
}

declare noundef nonnull align 8 dereferenceable(16) ptr @_ZNSirsERi(ptr noundef nonnull align 8 dereferenceable(16), ptr noundef nonnull align 4 dereferenceable(4)) local_unnamed_addr #2

; Function Attrs: mustprogress uwtable
declare noundef nonnull align 8 dereferenceable(8) ptr @_ZNSolsEx(ptr noundef nonnull align 8 dereferenceable(8), i64 noundef) local_unnamed_addr #0 align 2

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

; Function Attrs: inlinehint mustprogress uwtable
declare noundef nonnull align 8 dereferenceable(8) ptr @_ZSt4endlIcSt11char_traitsIcEERSt13basic_ostreamIT_T0_ES6_(ptr noundef nonnull align 8 dereferenceable(8)) #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 norecurse 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 = { "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 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" }

!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 = distinct !{!9, !10}
!10 = !{!"llvm.loop.mustprogress"}
!11 = distinct !{!11, !10}
!12 = distinct !{!12, !10}
!13 = distinct !{!13, !10}


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