; LLVM IR from MinaFaried3/Assiut-University-Training---Newcomers :: l-sheet9_general_medium (Q-DreamoonandStairs)

; 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" }

@_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 @_Z4Fastv() #0

; Function Attrs: mustprogress norecurse uwtable
define dso_local noundef i32 @main() #1 {
  %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 i32, align 4
  store i32 0, ptr %1, align 4
  call void @_Z4Fastv()
  call void @llvm.lifetime.start.p0(i64 4, ptr %2) #4
  call void @llvm.lifetime.start.p0(i64 4, ptr %3) #4
  %7 = call noundef nonnull align 8 dereferenceable(16) ptr @_ZNSirsERi(ptr noundef nonnull align 8 dereferenceable(16) @_ZSt3cin, ptr noundef nonnull align 4 dereferenceable(4) %2)
  %8 = call noundef nonnull align 8 dereferenceable(16) ptr @_ZNSirsERi(ptr noundef nonnull align 8 dereferenceable(16) %7, ptr noundef nonnull align 4 dereferenceable(4) %3)
  %9 = load i32, ptr %3, align 4, !tbaa !5
  %10 = load i32, ptr %2, align 4, !tbaa !5
  %11 = icmp sgt i32 %9, %10
  br i1 %11, label %12, label %14

12:                                               ; preds = %0
  %13 = call noundef nonnull align 8 dereferenceable(8) ptr @_ZNSolsEi(ptr noundef nonnull align 8 dereferenceable(8) @_ZSt4cout, i32 noundef -1)
  store i32 0, ptr %1, align 4
  store i32 1, ptr %4, align 4
  br label %51

14:                                               ; preds = %0
  call void @llvm.lifetime.start.p0(i64 4, ptr %5) #4
  %15 = load i32, ptr %2, align 4, !tbaa !5
  %16 = srem i32 %15, 2
  %17 = icmp eq i32 %16, 0
  br i1 %17, label %18, label %21

18:                                               ; preds = %14
  %19 = load i32, ptr %2, align 4, !tbaa !5
  %20 = sdiv i32 %19, 2
  store i32 %20, ptr %5, align 4, !tbaa !5
  br label %25

21:                                               ; preds = %14
  %22 = load i32, ptr %2, align 4, !tbaa !5
  %23 = sdiv i32 %22, 2
  %24 = add nsw i32 %23, 1
  store i32 %24, ptr %5, align 4, !tbaa !5
  br label %25

25:                                               ; preds = %21, %18
  call void @llvm.lifetime.start.p0(i64 4, ptr %6) #4
  %26 = load i32, ptr %5, align 4, !tbaa !5
  store i32 %26, ptr %6, align 4, !tbaa !5
  br label %27

27:                                               ; preds = %41, %25
  %28 = load i32, ptr %6, align 4, !tbaa !5
  %29 = load i32, ptr %2, align 4, !tbaa !5
  %30 = icmp sle i32 %28, %29
  br i1 %30, label %32, label %31

31:                                               ; preds = %27
  store i32 2, ptr %4, align 4
  br label %44

32:                                               ; preds = %27
  %33 = load i32, ptr %6, align 4, !tbaa !5
  %34 = load i32, ptr %3, align 4, !tbaa !5
  %35 = srem i32 %33, %34
  %36 = icmp eq i32 %35, 0
  br i1 %36, label %37, label %40

37:                                               ; preds = %32
  %38 = load i32, ptr %6, align 4, !tbaa !5
  %39 = call noundef nonnull align 8 dereferenceable(8) ptr @_ZNSolsEi(ptr noundef nonnull align 8 dereferenceable(8) @_ZSt4cout, i32 noundef %38)
  store i32 0, ptr %1, align 4
  store i32 1, ptr %4, align 4
  br label %44

40:                                               ; preds = %32
  br label %41

41:                                               ; preds = %40
  %42 = load i32, ptr %6, align 4, !tbaa !5
  %43 = add nsw i32 %42, 1
  store i32 %43, ptr %6, align 4, !tbaa !5
  br label %27, !llvm.loop !9

44:                                               ; preds = %37, %31
  call void @llvm.lifetime.end.p0(i64 4, ptr %6) #4
  %45 = load i32, ptr %4, align 4
  switch i32 %45, label %47 [
    i32 2, label %46
  ]

46:                                               ; preds = %44
  store i32 0, ptr %4, align 4
  br label %47

47:                                               ; preds = %46, %44
  call void @llvm.lifetime.end.p0(i64 4, ptr %5) #4
  %48 = load i32, ptr %4, align 4
  switch i32 %48, label %51 [
    i32 0, label %49
  ]

49:                                               ; preds = %47
  br label %50

50:                                               ; preds = %49
  store i32 0, ptr %4, align 4
  br label %51

51:                                               ; preds = %50, %47, %12
  call void @llvm.lifetime.end.p0(i64 4, ptr %3) #4
  call void @llvm.lifetime.end.p0(i64 4, ptr %2) #4
  %52 = load i32, ptr %4, align 4
  switch i32 %52, label %55 [
    i32 0, label %53
    i32 1, label %53
  ]

53:                                               ; preds = %51, %51
  %54 = load i32, ptr %1, align 4
  ret i32 %54

55:                                               ; preds = %51
  unreachable
}

; Function Attrs: nocallback nofree nosync nounwind willreturn memory(argmem: readwrite)
declare void @llvm.lifetime.start.p0(i64 immarg, ptr nocapture) #2

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

declare noundef nonnull align 8 dereferenceable(8) ptr @_ZNSolsEi(ptr noundef nonnull align 8 dereferenceable(8), i32 noundef) #3

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


; 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" }

@_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 @_Z4Fastv() local_unnamed_addr #0

; Function Attrs: mustprogress norecurse uwtable
define dso_local noundef i32 @main() local_unnamed_addr #1 {
  %1 = alloca i32, align 4
  %2 = alloca i32, align 4
  tail call void @_Z4Fastv()
  call void @llvm.lifetime.start.p0(i64 4, ptr nonnull %1) #4
  call void @llvm.lifetime.start.p0(i64 4, ptr nonnull %2) #4
  %3 = call noundef nonnull align 8 dereferenceable(16) ptr @_ZNSirsERi(ptr noundef nonnull align 8 dereferenceable(16) @_ZSt3cin, ptr noundef nonnull align 4 dereferenceable(4) %1)
  %4 = call noundef nonnull align 8 dereferenceable(16) ptr @_ZNSirsERi(ptr noundef nonnull align 8 dereferenceable(16) %3, ptr noundef nonnull align 4 dereferenceable(4) %2)
  %5 = load i32, ptr %2, align 4, !tbaa !5
  %6 = load i32, ptr %1, align 4, !tbaa !5
  %7 = icmp sgt i32 %5, %6
  br i1 %7, label %.loopexit.sink.split, label %8

8:                                                ; preds = %0
  %9 = and i32 %6, 1
  %10 = icmp eq i32 %9, 0
  br i1 %10, label %11, label %13

11:                                               ; preds = %8
  %12 = ashr exact i32 %6, 1
  br label %16

13:                                               ; preds = %8
  %14 = sdiv i32 %6, 2
  %15 = add nsw i32 %14, 1
  br label %16

16:                                               ; preds = %13, %11
  %.010 = phi i32 [ %12, %11 ], [ %15, %13 ]
  %.not15 = icmp sgt i32 %.010, %6
  br i1 %.not15, label %.loopexit, label %.lr.ph

.lr.ph:                                           ; preds = %16, %19
  %.016 = phi i32 [ %20, %19 ], [ %.010, %16 ]
  %17 = srem i32 %.016, %5
  %18 = icmp eq i32 %17, 0
  br i1 %18, label %.loopexit.sink.split, label %19

19:                                               ; preds = %.lr.ph
  %20 = add i32 %.016, 1
  %exitcond.not = icmp eq i32 %.016, %6
  br i1 %exitcond.not, label %.loopexit, label %.lr.ph, !llvm.loop !9

.loopexit.sink.split:                             ; preds = %.lr.ph, %0
  %.016.lcssa.sink = phi i32 [ -1, %0 ], [ %.016, %.lr.ph ]
  %21 = call noundef nonnull align 8 dereferenceable(8) ptr @_ZNSolsEi(ptr noundef nonnull align 8 dereferenceable(8) @_ZSt4cout, i32 noundef %.016.lcssa.sink)
  br label %.loopexit

.loopexit:                                        ; preds = %19, %.loopexit.sink.split, %16
  call void @llvm.lifetime.end.p0(i64 4, ptr nonnull %2) #4
  call void @llvm.lifetime.end.p0(i64 4, ptr nonnull %1) #4
  ret i32 0
}

; Function Attrs: mustprogress nocallback nofree nosync nounwind willreturn memory(argmem: readwrite)
declare void @llvm.lifetime.start.p0(i64 immarg, ptr nocapture) #2

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 #3

declare noundef nonnull align 8 dereferenceable(8) ptr @_ZNSolsEi(ptr noundef nonnull align 8 dereferenceable(8), i32 noundef) 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) #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 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 = { mustprogress nocallback nofree nosync nounwind willreturn memory(argmem: readwrite) }
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 = { 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"}


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