; LLVM IR from tangjz/acm-icpc :: codeforces/gym (103957D)

; 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"

@t = external dso_local global i32, align 4
@a = external dso_local global i32, align 4
@b = external dso_local global i32, align 4
@.str.1 = external hidden unnamed_addr constant [3 x i8], align 1
@.str.2 = external hidden unnamed_addr constant [14 x i8], align 1
@.str.3 = external hidden unnamed_addr constant [5 x i8], align 1
@.str.4 = external hidden unnamed_addr constant [5 x i8], align 1

; Function Attrs: mustprogress uwtable
declare dso_local void @_Z4readRii(ptr noundef nonnull align 4 dereferenceable(4), i32 noundef) #0

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

declare i32 @__isoc99_scanf(ptr noundef, ...) #2

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

; Function Attrs: mustprogress norecurse uwtable
define dso_local noundef i32 @main() #3 {
  %1 = alloca i32, align 4
  %2 = alloca i32, align 4
  store i32 0, ptr %1, align 4
  %3 = call i32 (ptr, ...) @__isoc99_scanf(ptr noundef @.str.1, ptr noundef @t)
  call void @llvm.lifetime.start.p0(i64 4, ptr %2) #4
  store i32 1, ptr %2, align 4, !tbaa !5
  br label %4

4:                                                ; preds = %33, %0
  %5 = load i32, ptr %2, align 4, !tbaa !5
  %6 = load i32, ptr @t, align 4, !tbaa !5
  %7 = icmp sle i32 %5, %6
  br i1 %7, label %9, label %8

8:                                                ; preds = %4
  call void @llvm.lifetime.end.p0(i64 4, ptr %2) #4
  br label %36

9:                                                ; preds = %4
  call void @_Z4readRii(ptr noundef nonnull align 4 dereferenceable(4) @a, i32 noundef 2)
  call void @_Z4readRii(ptr noundef nonnull align 4 dereferenceable(4) @b, i32 noundef 2)
  %10 = load i32, ptr %2, align 4, !tbaa !5
  %11 = load i32, ptr @a, align 4, !tbaa !5
  %12 = load i32, ptr @b, align 4, !tbaa !5
  %13 = shl i32 %12, 1
  %14 = icmp ne i32 %11, %13
  br i1 %14, label %15, label %28

15:                                               ; preds = %9
  %16 = load i32, ptr @b, align 4, !tbaa !5
  %17 = icmp eq i32 %16, 1
  br i1 %17, label %27, label %18

18:                                               ; preds = %15
  %19 = load i32, ptr @b, align 4, !tbaa !5
  %20 = icmp eq i32 %19, 10
  br i1 %20, label %27, label %21

21:                                               ; preds = %18
  %22 = load i32, ptr @b, align 4, !tbaa !5
  %23 = icmp eq i32 %22, 100
  br i1 %23, label %27, label %24

24:                                               ; preds = %21
  %25 = load i32, ptr @b, align 4, !tbaa !5
  %26 = icmp eq i32 %25, 1000
  br i1 %26, label %27, label %28

27:                                               ; preds = %24, %21, %18, %15
  br label %29

28:                                               ; preds = %24, %9
  br label %29

29:                                               ; preds = %28, %27
  %30 = phi ptr [ @.str.3, %27 ], [ @.str.4, %28 ]
  %31 = getelementptr inbounds [5 x i8], ptr %30, i64 0, i64 0
  %32 = call i32 (ptr, ...) @printf(ptr noundef @.str.2, i32 noundef %10, ptr noundef %31)
  br label %33

33:                                               ; preds = %29
  %34 = load i32, ptr %2, align 4, !tbaa !5
  %35 = add nsw i32 %34, 1
  store i32 %35, ptr %2, align 4, !tbaa !5
  br label %4, !llvm.loop !9

36:                                               ; preds = %8
  ret i32 0
}

declare i32 @printf(ptr noundef, ...) #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 = { "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 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 #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"

@t = external dso_local global i32, align 4
@a = external dso_local global i32, align 4
@b = external dso_local global i32, align 4
@.str.1 = external hidden unnamed_addr constant [3 x i8], align 1
@.str.2 = external hidden unnamed_addr constant [14 x i8], align 1
@.str.3 = external hidden unnamed_addr constant [5 x i8], align 1
@.str.4 = external hidden unnamed_addr constant [5 x i8], align 1

; Function Attrs: mustprogress uwtable
declare dso_local void @_Z4readRii(ptr noundef nonnull align 4 dereferenceable(4), i32 noundef) local_unnamed_addr #0

; Function Attrs: nofree nounwind
declare noundef i32 @__isoc99_scanf(ptr nocapture noundef readonly, ...) local_unnamed_addr #1

; Function Attrs: mustprogress norecurse uwtable
define dso_local noundef i32 @main() local_unnamed_addr #2 {
  %1 = tail call i32 (ptr, ...) @__isoc99_scanf(ptr noundef nonnull @.str.1, ptr noundef nonnull @t)
  %2 = load i32, ptr @t, align 4, !tbaa !5
  %.not9 = icmp slt i32 %2, 1
  br i1 %.not9, label %._crit_edge, label %.lr.ph

._crit_edge:                                      ; preds = %8, %0
  ret i32 0

.lr.ph:                                           ; preds = %0, %8
  %.010 = phi i32 [ %11, %8 ], [ 1, %0 ]
  tail call void @_Z4readRii(ptr noundef nonnull align 4 dereferenceable(4) @a, i32 noundef 2)
  tail call void @_Z4readRii(ptr noundef nonnull align 4 dereferenceable(4) @b, i32 noundef 2)
  %3 = load i32, ptr @a, align 4, !tbaa !5
  %4 = load i32, ptr @b, align 4
  %5 = shl i32 %4, 1
  %.not8 = icmp eq i32 %3, %5
  br i1 %.not8, label %7, label %6

6:                                                ; preds = %.lr.ph
  switch i32 %4, label %7 [
    i32 1000, label %8
    i32 100, label %8
    i32 10, label %8
    i32 1, label %8
  ]

7:                                                ; preds = %6, %.lr.ph
  br label %8

8:                                                ; preds = %6, %6, %6, %6, %7
  %9 = phi ptr [ @.str.4, %7 ], [ @.str.3, %6 ], [ @.str.3, %6 ], [ @.str.3, %6 ], [ @.str.3, %6 ]
  %10 = tail call i32 (ptr, ...) @printf(ptr noundef nonnull dereferenceable(1) @.str.2, i32 noundef %.010, ptr noundef nonnull %9)
  %11 = add nuw nsw i32 %.010, 1
  %12 = load i32, ptr @t, align 4, !tbaa !5
  %.not.not = icmp slt i32 %.010, %12
  br i1 %.not.not, label %.lr.ph, label %._crit_edge, !llvm.loop !9
}

; Function Attrs: nofree nounwind
declare noundef i32 @printf(ptr nocapture noundef readonly, ...) local_unnamed_addr #1

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 = { nofree nounwind "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 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" }

!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,GlobalOptPass,InferFunctionAttrsPass,InstCombinePass,JumpThreadingPass,LoopRotatePass,LoopSimplifyPass,LoopUnrollPass,SROAPass,SimplifyCFGPass,TailCallElimPass