; LLVM IR from tangjz/acm-icpc :: self_training/2014-12-26 (A)

; 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
@n = external dso_local global i32, align 4
@k = external dso_local global i32, align 4
@.str = external hidden unnamed_addr constant [3 x i8], align 1
@.str.1 = external hidden unnamed_addr constant [5 x i8], align 1
@.str.2 = external hidden unnamed_addr constant [2 x i8], align 1
@.str.3 = external hidden unnamed_addr constant [2 x i8], align 1
@.str.4 = external hidden unnamed_addr constant [2 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
  %2 = call i32 (ptr, ...) @__isoc99_scanf(ptr noundef @.str, ptr noundef @t)
  br label %3

3:                                                ; preds = %42, %0
  %4 = load i32, ptr @t, align 4, !tbaa !5
  %5 = add nsw i32 %4, -1
  store i32 %5, ptr @t, align 4, !tbaa !5
  %6 = icmp ne i32 %4, 0
  br i1 %6, label %7, label %43

7:                                                ; preds = %3
  %8 = call i32 (ptr, ...) @__isoc99_scanf(ptr noundef @.str.1, ptr noundef @n, ptr noundef @k)
  %9 = load i32, ptr @n, align 4, !tbaa !5
  %10 = srem i32 %9, 2
  %11 = icmp eq i32 %10, 0
  br i1 %11, label %12, label %18

12:                                               ; preds = %7
  %13 = load i32, ptr @k, align 4, !tbaa !5
  %14 = srem i32 %13, 2
  %15 = icmp eq i32 %14, 1
  br i1 %15, label %16, label %18

16:                                               ; preds = %12
  %17 = call i32 @puts(ptr noundef @.str.2)
  br label %42

18:                                               ; preds = %12, %7
  %19 = load i32, ptr @n, align 4, !tbaa !5
  %20 = srem i32 %19, 2
  %21 = icmp eq i32 %20, 0
  br i1 %21, label %22, label %27

22:                                               ; preds = %18
  %23 = load i32, ptr @k, align 4, !tbaa !5
  %24 = ashr i32 %23, 1
  %25 = srem i32 %24, 2
  %26 = icmp eq i32 %25, 0
  br i1 %26, label %37, label %27

27:                                               ; preds = %22, %18
  %28 = load i32, ptr @n, align 4, !tbaa !5
  %29 = srem i32 %28, 2
  %30 = icmp eq i32 %29, 1
  br i1 %30, label %31, label %39

31:                                               ; preds = %27
  %32 = load i32, ptr @k, align 4, !tbaa !5
  %33 = sub nsw i32 %32, 1
  %34 = ashr i32 %33, 1
  %35 = srem i32 %34, 2
  %36 = icmp eq i32 %35, 1
  br i1 %36, label %37, label %39

37:                                               ; preds = %31, %22
  %38 = call i32 @puts(ptr noundef @.str.3)
  br label %41

39:                                               ; preds = %31, %27
  %40 = call i32 @puts(ptr noundef @.str.4)
  br label %41

41:                                               ; preds = %39, %37
  br label %42

42:                                               ; preds = %41, %16
  br label %3, !llvm.loop !9

43:                                               ; preds = %3
  ret i32 0
}

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

declare i32 @puts(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"}


; 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
@n = external dso_local global i32, align 4
@k = external dso_local global i32, align 4
@.str = external hidden unnamed_addr constant [3 x i8], align 1
@.str.1 = external hidden unnamed_addr constant [5 x i8], align 1
@.str.2 = external hidden unnamed_addr constant [2 x i8], align 1
@.str.3 = external hidden unnamed_addr constant [2 x i8], align 1
@.str.4 = external hidden unnamed_addr constant [2 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 @t)
  %2 = load i32, ptr @t, align 4, !tbaa !5
  %3 = add nsw i32 %2, -1
  store i32 %3, ptr @t, align 4, !tbaa !5
  %.not1 = icmp eq i32 %2, 0
  br i1 %.not1, label %._crit_edge, label %.lr.ph

.lr.ph:                                           ; preds = %0, %25
  %4 = tail call i32 (ptr, ...) @__isoc99_scanf(ptr noundef nonnull @.str.1, ptr noundef nonnull @n, ptr noundef nonnull @k)
  %5 = load i32, ptr @n, align 4, !tbaa !5
  %6 = and i32 %5, 1
  %7 = icmp eq i32 %6, 0
  br i1 %7, label %8, label %15

8:                                                ; preds = %.lr.ph
  %9 = load i32, ptr @k, align 4, !tbaa !5
  %10 = and i32 %9, -2147483647
  %11 = icmp eq i32 %10, 1
  br i1 %11, label %25, label %12

12:                                               ; preds = %8
  %13 = and i32 %9, 2
  %14 = icmp eq i32 %13, 0
  br i1 %14, label %25, label %15

15:                                               ; preds = %.lr.ph, %12
  %16 = and i32 %5, -2147483647
  %17 = icmp eq i32 %16, 1
  br i1 %17, label %18, label %24

18:                                               ; preds = %15
  %19 = load i32, ptr @k, align 4, !tbaa !5
  %20 = add nsw i32 %19, -1
  %21 = ashr i32 %20, 1
  %22 = and i32 %21, -2147483647
  %23 = icmp eq i32 %22, 1
  br i1 %23, label %25, label %24

24:                                               ; preds = %18, %15
  br label %25

25:                                               ; preds = %12, %18, %8, %24
  %.str.3.sink = phi ptr [ @.str.4, %24 ], [ @.str.2, %8 ], [ @.str.3, %18 ], [ @.str.3, %12 ]
  %26 = tail call i32 @puts(ptr noundef nonnull dereferenceable(1) %.str.3.sink)
  %27 = load i32, ptr @t, align 4, !tbaa !5
  %28 = add nsw i32 %27, -1
  store i32 %28, ptr @t, align 4, !tbaa !5
  %.not = icmp eq i32 %27, 0
  br i1 %.not, label %._crit_edge, label %.lr.ph, !llvm.loop !9

._crit_edge:                                      ; preds = %25, %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 @puts(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"}


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