; LLVM IR from bqi343/cp-notebook :: Contests/USACO Solutions/2009-10/starc.ll (Z3winSt6vectorIiSaIiEE)

; 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::vector" = type { %"struct.std::_Vector_base" }
%"struct.std::_Vector_base" = type { %"struct.std::_Vector_base<std::complex<long double>, std::allocator<std::complex<long double>>>::_Vector_impl" }
%"struct.std::_Vector_base<std::complex<long double>, std::allocator<std::complex<long double>>>::_Vector_impl" = type { %"struct.std::_Vector_base<std::complex<long double>, std::allocator<std::complex<long double>>>::_Vector_impl_data" }
%"struct.std::_Vector_base<std::complex<long double>, std::allocator<std::complex<long double>>>::_Vector_impl_data" = type { ptr, ptr, ptr }
%"class.__gnu_cxx::__normal_iterator" = type { ptr }

@poly = external dso_local global %"class.std::vector", align 8

; 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 uwtable
define dso_local noundef signext i8 @_Z3winSt6vectorIiSaIiEE(ptr noundef %0) #1 {
  %2 = alloca i8, align 1
  %3 = alloca ptr, align 8
  %4 = alloca i32, align 4
  %5 = alloca ptr, align 8
  %6 = alloca %"class.__gnu_cxx::__normal_iterator", align 8
  %7 = alloca %"class.__gnu_cxx::__normal_iterator", align 8
  %8 = alloca ptr, align 8
  %9 = alloca x86_fp80, align 16
  %10 = alloca i32, align 4
  store ptr %0, ptr %3, align 8, !tbaa !5
  call void @llvm.lifetime.start.p0(i64 4, ptr %4) #5
  store i32 0, ptr %4, align 4, !tbaa !9
  call void @llvm.lifetime.start.p0(i64 8, ptr %5) #5
  store ptr @poly, ptr %5, align 8, !tbaa !5
  call void @llvm.lifetime.start.p0(i64 8, ptr %6) #5
  %11 = call ptr @_ZNSt6vectorISt7complexIeESaIS1_EE5beginEv(ptr noundef nonnull align 8 dereferenceable(24) @poly) #5
  %12 = getelementptr inbounds %"class.__gnu_cxx::__normal_iterator", ptr %6, i32 0, i32 0
  store ptr %11, ptr %12, align 8
  call void @llvm.lifetime.start.p0(i64 8, ptr %7) #5
  %13 = call ptr @_ZNSt6vectorISt7complexIeESaIS1_EE3endEv(ptr noundef nonnull align 8 dereferenceable(24) @poly) #5
  %14 = getelementptr inbounds %"class.__gnu_cxx::__normal_iterator", ptr %7, i32 0, i32 0
  store ptr %13, ptr %14, align 8
  br label %15

15:                                               ; preds = %48, %1
  %16 = call noundef zeroext i1 @_ZN9__gnu_cxxneIPSt7complexIeESt6vectorIS2_SaIS2_EEEEbRKNS_17__normal_iteratorIT_T0_EESC_(ptr noundef nonnull align 8 dereferenceable(8) %6, ptr noundef nonnull align 8 dereferenceable(8) %7) #5
  br i1 %16, label %18, label %17

17:                                               ; preds = %15
  call void @llvm.lifetime.end.p0(i64 8, ptr %7) #5
  call void @llvm.lifetime.end.p0(i64 8, ptr %6) #5
  call void @llvm.lifetime.end.p0(i64 8, ptr %5) #5
  br label %50

18:                                               ; preds = %15
  call void @llvm.lifetime.start.p0(i64 8, ptr %8) #5
  %19 = call noundef nonnull align 16 dereferenceable(32) ptr @_ZNK9__gnu_cxx17__normal_iteratorIPSt7complexIeESt6vectorIS2_SaIS2_EEEdeEv(ptr noundef nonnull align 8 dereferenceable(8) %6) #5
  store ptr %19, ptr %8, align 8, !tbaa !5
  call void @llvm.lifetime.start.p0(i64 16, ptr %9) #5
  %20 = call noundef nonnull align 4 dereferenceable(4) ptr @_ZNSt6vectorIiSaIiEEixEm(ptr noundef nonnull align 8 dereferenceable(24) %0, i64 noundef 0) #5
  %21 = load i32, ptr %20, align 4, !tbaa !9
  %22 = sitofp i32 %21 to x86_fp80
  %23 = load ptr, ptr %8, align 8, !tbaa !5
  %24 = call noundef x86_fp80 @_ZNKSt7complexIeE4realB5cxx11Ev(ptr noundef nonnull align 16 dereferenceable(32) %23)
  %25 = call noundef nonnull align 4 dereferenceable(4) ptr @_ZNSt6vectorIiSaIiEEixEm(ptr noundef nonnull align 8 dereferenceable(24) %0, i64 noundef 1) #5
  %26 = load i32, ptr %25, align 4, !tbaa !9
  %27 = sitofp i32 %26 to x86_fp80
  %28 = load ptr, ptr %8, align 8, !tbaa !5
  %29 = call noundef x86_fp80 @_ZNKSt7complexIeE4imagB5cxx11Ev(ptr noundef nonnull align 16 dereferenceable(32) %28)
  %30 = fmul x86_fp80 %27, %29
  %31 = call x86_fp80 @llvm.fmuladd.f80(x86_fp80 %22, x86_fp80 %24, x86_fp80 %30)
  %32 = call noundef nonnull align 4 dereferenceable(4) ptr @_ZNSt6vectorIiSaIiEEixEm(ptr noundef nonnull align 8 dereferenceable(24) %0, i64 noundef 2) #5
  %33 = load i32, ptr %32, align 4, !tbaa !9
  %34 = sitofp i32 %33 to x86_fp80
  %35 = fadd x86_fp80 %31, %34
  store x86_fp80 %35, ptr %9, align 16, !tbaa !11
  %36 = load x86_fp80, ptr %9, align 16, !tbaa !11
  %37 = fcmp oge x86_fp80 %36, 0xKBFDDDBE6FECEBDEDD800
  br i1 %37, label %38, label %41

38:                                               ; preds = %18
  %39 = load i32, ptr %4, align 4, !tbaa !9
  %40 = or i32 %39, 1
  store i32 %40, ptr %4, align 4, !tbaa !9
  br label %41

41:                                               ; preds = %38, %18
  %42 = load x86_fp80, ptr %9, align 16, !tbaa !11
  %43 = fcmp ole x86_fp80 %42, 0xK3FDDDBE6FECEBDEDD800
  br i1 %43, label %44, label %47

44:                                               ; preds = %41
  %45 = load i32, ptr %4, align 4, !tbaa !9
  %46 = or i32 %45, 2
  store i32 %46, ptr %4, align 4, !tbaa !9
  br label %47

47:                                               ; preds = %44, %41
  call void @llvm.lifetime.end.p0(i64 16, ptr %9) #5
  call void @llvm.lifetime.end.p0(i64 8, ptr %8) #5
  br label %48

48:                                               ; preds = %47
  %49 = call noundef nonnull align 8 dereferenceable(8) ptr @_ZN9__gnu_cxx17__normal_iteratorIPSt7complexIeESt6vectorIS2_SaIS2_EEEppEv(ptr noundef nonnull align 8 dereferenceable(8) %6) #5
  br label %15

50:                                               ; preds = %17
  %51 = load i32, ptr %4, align 4, !tbaa !9
  %52 = icmp eq i32 %51, 1
  br i1 %52, label %53, label %54

53:                                               ; preds = %50
  store i8 74, ptr %2, align 1
  store i32 1, ptr %10, align 4
  br label %59

54:                                               ; preds = %50
  %55 = load i32, ptr %4, align 4, !tbaa !9
  %56 = icmp eq i32 %55, 2
  br i1 %56, label %57, label %58

57:                                               ; preds = %54
  store i8 66, ptr %2, align 1
  store i32 1, ptr %10, align 4
  br label %59

58:                                               ; preds = %54
  store i8 85, ptr %2, align 1
  store i32 1, ptr %10, align 4
  br label %59

59:                                               ; preds = %58, %57, %53
  call void @llvm.lifetime.end.p0(i64 4, ptr %4) #5
  %60 = load i8, ptr %2, align 1
  ret i8 %60
}

; Function Attrs: mustprogress nounwind uwtable
declare dso_local ptr @_ZNSt6vectorISt7complexIeESaIS1_EE5beginEv(ptr noundef nonnull align 8 dereferenceable(24)) #2 align 2

; Function Attrs: mustprogress nounwind uwtable
declare dso_local ptr @_ZNSt6vectorISt7complexIeESaIS1_EE3endEv(ptr noundef nonnull align 8 dereferenceable(24)) #2 align 2

; Function Attrs: inlinehint mustprogress nounwind uwtable
declare dso_local noundef zeroext i1 @_ZN9__gnu_cxxneIPSt7complexIeESt6vectorIS2_SaIS2_EEEEbRKNS_17__normal_iteratorIT_T0_EESC_(ptr noundef nonnull align 8 dereferenceable(8), ptr noundef nonnull align 8 dereferenceable(8)) #3

; Function Attrs: mustprogress nounwind uwtable
declare dso_local noundef nonnull align 16 dereferenceable(32) ptr @_ZNK9__gnu_cxx17__normal_iteratorIPSt7complexIeESt6vectorIS2_SaIS2_EEEdeEv(ptr noundef nonnull align 8 dereferenceable(8)) #2 align 2

; Function Attrs: mustprogress nounwind uwtable
declare dso_local noundef nonnull align 4 dereferenceable(4) ptr @_ZNSt6vectorIiSaIiEEixEm(ptr noundef nonnull align 8 dereferenceable(24), i64 noundef) #2 align 2

; Function Attrs: mustprogress nounwind uwtable
declare dso_local noundef x86_fp80 @_ZNKSt7complexIeE4realB5cxx11Ev(ptr noundef nonnull align 16 dereferenceable(32)) #2 align 2

; Function Attrs: mustprogress nounwind uwtable
declare dso_local noundef x86_fp80 @_ZNKSt7complexIeE4imagB5cxx11Ev(ptr noundef nonnull align 16 dereferenceable(32)) #2 align 2

; Function Attrs: nocallback nofree nosync nounwind speculatable willreturn memory(none)
declare x86_fp80 @llvm.fmuladd.f80(x86_fp80, x86_fp80, x86_fp80) #4

; Function Attrs: mustprogress nounwind uwtable
declare dso_local noundef nonnull align 8 dereferenceable(8) ptr @_ZN9__gnu_cxx17__normal_iteratorIPSt7complexIeESt6vectorIS2_SaIS2_EEEppEv(ptr noundef nonnull align 8 dereferenceable(8)) #2 align 2

attributes #0 = { nocallback nofree nosync nounwind willreturn memory(argmem: readwrite) }
attributes #1 = { 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 #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 = { nocallback nofree nosync nounwind speculatable willreturn memory(none) }
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 = !{!12, !12, i64 0}
!12 = !{!"long double", !7, i64 0}


; 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::vector" = type { %"struct.std::_Vector_base" }
%"struct.std::_Vector_base" = type { %"struct.std::_Vector_base<std::complex<long double>, std::allocator<std::complex<long double>>>::_Vector_impl" }
%"struct.std::_Vector_base<std::complex<long double>, std::allocator<std::complex<long double>>>::_Vector_impl" = type { %"struct.std::_Vector_base<std::complex<long double>, std::allocator<std::complex<long double>>>::_Vector_impl_data" }
%"struct.std::_Vector_base<std::complex<long double>, std::allocator<std::complex<long double>>>::_Vector_impl_data" = type { ptr, ptr, ptr }
%"class.__gnu_cxx::__normal_iterator" = type { ptr }

@poly = external dso_local global %"class.std::vector", align 8

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

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

; Function Attrs: mustprogress nounwind uwtable
define dso_local noundef signext range(i8 66, 86) i8 @_Z3winSt6vectorIiSaIiEE(ptr noundef %0) local_unnamed_addr #1 {
  %2 = alloca %"class.__gnu_cxx::__normal_iterator", align 8
  %3 = alloca %"class.__gnu_cxx::__normal_iterator", align 8
  call void @llvm.lifetime.start.p0(i64 8, ptr nonnull %2) #4
  %4 = tail call ptr @_ZNSt6vectorISt7complexIeESaIS1_EE5beginEv(ptr noundef nonnull align 8 dereferenceable(24) @poly) #4
  store ptr %4, ptr %2, align 8
  call void @llvm.lifetime.start.p0(i64 8, ptr nonnull %3) #4
  %5 = tail call ptr @_ZNSt6vectorISt7complexIeESaIS1_EE3endEv(ptr noundef nonnull align 8 dereferenceable(24) @poly) #4
  store ptr %5, ptr %3, align 8
  %6 = call noundef zeroext i1 @_ZN9__gnu_cxxneIPSt7complexIeESt6vectorIS2_SaIS2_EEEEbRKNS_17__normal_iteratorIT_T0_EESC_(ptr noundef nonnull align 8 dereferenceable(8) %2, ptr noundef nonnull align 8 dereferenceable(8) %3) #4
  br i1 %6, label %.lr.ph, label %.thread

.thread:                                          ; preds = %1
  call void @llvm.lifetime.end.p0(i64 8, ptr nonnull %3) #4
  call void @llvm.lifetime.end.p0(i64 8, ptr nonnull %2) #4
  br label %7

._crit_edge:                                      ; preds = %.lr.ph
  call void @llvm.lifetime.end.p0(i64 8, ptr nonnull %3) #4
  call void @llvm.lifetime.end.p0(i64 8, ptr nonnull %2) #4
  %switch.selectcmp = icmp eq i32 %.2.fr, 2
  %spec.select = select i1 %switch.selectcmp, i8 66, i8 85
  %switch.selectcmp9 = icmp eq i32 %.2.fr, 1
  %spec.select20 = select i1 %switch.selectcmp9, i8 74, i8 %spec.select
  br label %7

7:                                                ; preds = %._crit_edge, %.thread
  %8 = phi i8 [ 85, %.thread ], [ %spec.select20, %._crit_edge ]
  ret i8 %8

.lr.ph:                                           ; preds = %1, %.lr.ph
  %.0811 = phi i32 [ %.2.fr, %.lr.ph ], [ 0, %1 ]
  %9 = call noundef nonnull align 16 dereferenceable(32) ptr @_ZNK9__gnu_cxx17__normal_iteratorIPSt7complexIeESt6vectorIS2_SaIS2_EEEdeEv(ptr noundef nonnull align 8 dereferenceable(8) %2) #4
  %10 = call noundef nonnull align 4 dereferenceable(4) ptr @_ZNSt6vectorIiSaIiEEixEm(ptr noundef nonnull align 8 dereferenceable(24) %0, i64 noundef 0) #4
  %11 = load i32, ptr %10, align 4, !tbaa !5
  %12 = sitofp i32 %11 to x86_fp80
  %13 = call noundef x86_fp80 @_ZNKSt7complexIeE4realB5cxx11Ev(ptr noundef nonnull align 16 dereferenceable(32) %9)
  %14 = call noundef nonnull align 4 dereferenceable(4) ptr @_ZNSt6vectorIiSaIiEEixEm(ptr noundef nonnull align 8 dereferenceable(24) %0, i64 noundef 1) #4
  %15 = load i32, ptr %14, align 4, !tbaa !5
  %16 = sitofp i32 %15 to x86_fp80
  %17 = call noundef x86_fp80 @_ZNKSt7complexIeE4imagB5cxx11Ev(ptr noundef nonnull align 16 dereferenceable(32) %9)
  %18 = fmul x86_fp80 %17, %16
  %19 = call x86_fp80 @llvm.fmuladd.f80(x86_fp80 %12, x86_fp80 %13, x86_fp80 %18)
  %20 = call noundef nonnull align 4 dereferenceable(4) ptr @_ZNSt6vectorIiSaIiEEixEm(ptr noundef nonnull align 8 dereferenceable(24) %0, i64 noundef 2) #4
  %21 = load i32, ptr %20, align 4, !tbaa !5
  %22 = sitofp i32 %21 to x86_fp80
  %23 = fadd x86_fp80 %19, %22
  %24 = fcmp oge x86_fp80 %23, 0xKBFDDDBE6FECEBDEDD800
  %25 = zext i1 %24 to i32
  %.1 = or i32 %.0811, %25
  %26 = fcmp ugt x86_fp80 %23, 0xK3FDDDBE6FECEBDEDD800
  %27 = or i32 %.1, 2
  %.2 = select i1 %26, i32 %.1, i32 %27
  %.2.fr = freeze i32 %.2
  %28 = call noundef nonnull align 8 dereferenceable(8) ptr @_ZN9__gnu_cxx17__normal_iteratorIPSt7complexIeESt6vectorIS2_SaIS2_EEEppEv(ptr noundef nonnull align 8 dereferenceable(8) %2) #4
  %29 = call noundef zeroext i1 @_ZN9__gnu_cxxneIPSt7complexIeESt6vectorIS2_SaIS2_EEEEbRKNS_17__normal_iteratorIT_T0_EESC_(ptr noundef nonnull align 8 dereferenceable(8) %2, ptr noundef nonnull align 8 dereferenceable(8) %3) #4
  br i1 %29, label %.lr.ph, label %._crit_edge
}

; Function Attrs: mustprogress nounwind uwtable
declare dso_local ptr @_ZNSt6vectorISt7complexIeESaIS1_EE5beginEv(ptr noundef nonnull align 8 dereferenceable(24)) local_unnamed_addr #1 align 2

; Function Attrs: mustprogress nounwind uwtable
declare dso_local ptr @_ZNSt6vectorISt7complexIeESaIS1_EE3endEv(ptr noundef nonnull align 8 dereferenceable(24)) local_unnamed_addr #1 align 2

; Function Attrs: inlinehint mustprogress nounwind uwtable
declare dso_local noundef zeroext i1 @_ZN9__gnu_cxxneIPSt7complexIeESt6vectorIS2_SaIS2_EEEEbRKNS_17__normal_iteratorIT_T0_EESC_(ptr noundef nonnull align 8 dereferenceable(8), ptr noundef nonnull align 8 dereferenceable(8)) local_unnamed_addr #2

; Function Attrs: mustprogress nounwind uwtable
declare dso_local noundef nonnull align 16 dereferenceable(32) ptr @_ZNK9__gnu_cxx17__normal_iteratorIPSt7complexIeESt6vectorIS2_SaIS2_EEEdeEv(ptr noundef nonnull align 8 dereferenceable(8)) local_unnamed_addr #1 align 2

; Function Attrs: mustprogress nounwind uwtable
declare dso_local noundef nonnull align 4 dereferenceable(4) ptr @_ZNSt6vectorIiSaIiEEixEm(ptr noundef nonnull align 8 dereferenceable(24), i64 noundef) local_unnamed_addr #1 align 2

; Function Attrs: mustprogress nounwind uwtable
declare dso_local noundef x86_fp80 @_ZNKSt7complexIeE4realB5cxx11Ev(ptr noundef nonnull align 16 dereferenceable(32)) local_unnamed_addr #1 align 2

; Function Attrs: mustprogress nounwind uwtable
declare dso_local noundef x86_fp80 @_ZNKSt7complexIeE4imagB5cxx11Ev(ptr noundef nonnull align 16 dereferenceable(32)) local_unnamed_addr #1 align 2

; Function Attrs: mustprogress nocallback nofree nosync nounwind speculatable willreturn memory(none)
declare x86_fp80 @llvm.fmuladd.f80(x86_fp80, x86_fp80, x86_fp80) #3

; Function Attrs: mustprogress nounwind uwtable
declare dso_local noundef nonnull align 8 dereferenceable(8) ptr @_ZN9__gnu_cxx17__normal_iteratorIPSt7complexIeESt6vectorIS2_SaIS2_EEEppEv(ptr noundef nonnull align 8 dereferenceable(8)) local_unnamed_addr #1 align 2

attributes #0 = { mustprogress 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 = { 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 #3 = { mustprogress nocallback nofree nosync nounwind speculatable willreturn memory(none) }
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 = !{!"int", !7, i64 0}
!7 = !{!"omnipotent char", !8, i64 0}
!8 = !{!"Simple C++ TBAA"}


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