; LLVM IR from tangjz/acm-icpc :: self_training/2015-02-23 (C)

; 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"

@l = external dso_local global i32, align 4
@x = external dso_local global i32, align 4
@ans = external dso_local global i32, align 4
@sum = external dso_local global i32, align 4
@.str = external hidden unnamed_addr constant [5 x i8], align 1
@.str.1 = external hidden unnamed_addr constant [3 x i8], align 1
@.str.2 = external hidden unnamed_addr constant [4 x i8], align 1

; Function Attrs: mustprogress norecurse uwtable
define dso_local noundef i32 @main() #0 {
  %1 = alloca i32, align 4
  store i32 0, ptr %1, align 4
  br label %2

2:                                                ; preds = %28, %0
  %3 = call i32 (ptr, ...) @__isoc99_scanf(ptr noundef @.str, ptr noundef @l, ptr noundef @ans)
  %4 = icmp eq i32 %3, 2
  br i1 %4, label %5, label %31

5:                                                ; preds = %2
  store i32 1, ptr @sum, align 4, !tbaa !5
  br label %6

6:                                                ; preds = %27, %5
  %7 = load i32, ptr @l, align 4, !tbaa !5
  %8 = add nsw i32 %7, -1
  store i32 %8, ptr @l, align 4, !tbaa !5
  %9 = icmp ne i32 %8, 0
  br i1 %9, label %10, label %28

10:                                               ; preds = %6
  %11 = call i32 (ptr, ...) @__isoc99_scanf(ptr noundef @.str.1, ptr noundef @x)
  %12 = load i32, ptr @x, align 4, !tbaa !5
  %13 = load i32, ptr @ans, align 4, !tbaa !5
  %14 = icmp eq i32 %12, %13
  br i1 %14, label %15, label %18

15:                                               ; preds = %10
  %16 = load i32, ptr @sum, align 4, !tbaa !5
  %17 = add nsw i32 %16, 1
  store i32 %17, ptr @sum, align 4, !tbaa !5
  br label %27

18:                                               ; preds = %10
  %19 = load i32, ptr @sum, align 4, !tbaa !5
  %20 = icmp sgt i32 %19, 0
  br i1 %20, label %21, label %24

21:                                               ; preds = %18
  %22 = load i32, ptr @sum, align 4, !tbaa !5
  %23 = add nsw i32 %22, -1
  store i32 %23, ptr @sum, align 4, !tbaa !5
  br label %26

24:                                               ; preds = %18
  %25 = load i32, ptr @x, align 4, !tbaa !5
  store i32 %25, ptr @ans, align 4, !tbaa !5
  store i32 1, ptr @sum, align 4, !tbaa !5
  br label %26

26:                                               ; preds = %24, %21
  br label %27

27:                                               ; preds = %26, %15
  br label %6, !llvm.loop !9

28:                                               ; preds = %6
  %29 = load i32, ptr @ans, align 4, !tbaa !5
  %30 = call i32 (ptr, ...) @printf(ptr noundef @.str.2, i32 noundef %29)
  br label %2, !llvm.loop !11

31:                                               ; preds = %2
  ret i32 0
}

declare i32 @__isoc99_scanf(ptr noundef, ...) #1

declare i32 @printf(ptr noundef, ...) #1

attributes #0 = { 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 #1 = { "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}


; 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"

@l = external dso_local global i32, align 4
@x = external dso_local global i32, align 4
@ans = external dso_local global i32, align 4
@sum = external dso_local local_unnamed_addr global i32, align 4
@.str = external hidden unnamed_addr constant [5 x i8], align 1
@.str.1 = external hidden unnamed_addr constant [3 x i8], align 1
@.str.2 = external hidden unnamed_addr constant [4 x i8], align 1

; Function Attrs: mustprogress nofree norecurse nounwind uwtable
define dso_local noundef i32 @main() local_unnamed_addr #0 {
  %1 = tail call i32 (ptr, ...) @__isoc99_scanf(ptr noundef nonnull @.str, ptr noundef nonnull @l, ptr noundef nonnull @ans)
  %2 = icmp eq i32 %1, 2
  br i1 %2, label %.lr.ph4, label %._crit_edge5

.lr.ph4:                                          ; preds = %0, %._crit_edge
  store i32 1, ptr @sum, align 4, !tbaa !5
  %3 = load i32, ptr @l, align 4, !tbaa !5
  %4 = add nsw i32 %3, -1
  store i32 %4, ptr @l, align 4, !tbaa !5
  %.not2 = icmp eq i32 %4, 0
  br i1 %.not2, label %.lr.ph4.._crit_edge_crit_edge, label %.lr.ph

.lr.ph4.._crit_edge_crit_edge:                    ; preds = %.lr.ph4
  %.pre = load i32, ptr @ans, align 4, !tbaa !5
  br label %._crit_edge

.lr.ph:                                           ; preds = %.lr.ph4, %17
  %5 = tail call i32 (ptr, ...) @__isoc99_scanf(ptr noundef nonnull @.str.1, ptr noundef nonnull @x)
  %6 = load i32, ptr @x, align 4, !tbaa !5
  %7 = load i32, ptr @ans, align 4, !tbaa !5
  %8 = icmp eq i32 %6, %7
  %9 = load i32, ptr @sum, align 4, !tbaa !5
  br i1 %8, label %10, label %12

10:                                               ; preds = %.lr.ph
  %11 = add nsw i32 %9, 1
  br label %17

12:                                               ; preds = %.lr.ph
  %13 = icmp sgt i32 %9, 0
  br i1 %13, label %14, label %16

14:                                               ; preds = %12
  %15 = add nsw i32 %9, -1
  br label %17

16:                                               ; preds = %12
  store i32 %6, ptr @ans, align 4, !tbaa !5
  br label %17

17:                                               ; preds = %14, %16, %10
  %.sink = phi i32 [ %15, %14 ], [ 1, %16 ], [ %11, %10 ]
  %18 = phi i32 [ %7, %14 ], [ %6, %16 ], [ %6, %10 ]
  store i32 %.sink, ptr @sum, align 4, !tbaa !5
  %19 = load i32, ptr @l, align 4, !tbaa !5
  %20 = add nsw i32 %19, -1
  store i32 %20, ptr @l, align 4, !tbaa !5
  %.not = icmp eq i32 %20, 0
  br i1 %.not, label %._crit_edge, label %.lr.ph, !llvm.loop !9

._crit_edge:                                      ; preds = %17, %.lr.ph4.._crit_edge_crit_edge
  %21 = phi i32 [ %.pre, %.lr.ph4.._crit_edge_crit_edge ], [ %18, %17 ]
  %22 = tail call i32 (ptr, ...) @printf(ptr noundef nonnull dereferenceable(1) @.str.2, i32 noundef %21)
  %23 = tail call i32 (ptr, ...) @__isoc99_scanf(ptr noundef nonnull @.str, ptr noundef nonnull @l, ptr noundef nonnull @ans)
  %24 = icmp eq i32 %23, 2
  br i1 %24, label %.lr.ph4, label %._crit_edge5, !llvm.loop !11

._crit_edge5:                                     ; preds = %._crit_edge, %0
  ret i32 0
}

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

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

attributes #0 = { mustprogress nofree norecurse 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 #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" }

!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}


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