; LLVM IR from tangjz/acm-icpc :: codechef/SEPT18 (CHEFADV)

; 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
@m = external dso_local global i32, align 4
@x = external dso_local global i32, align 4
@y = 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 [9 x i8], align 1
@.str.2 = external hidden unnamed_addr constant [11 x i8], align 1
@.str.3 = external hidden unnamed_addr constant [6 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 = %40, %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 %45

7:                                                ; preds = %3
  %8 = call i32 (ptr, ...) @__isoc99_scanf(ptr noundef @.str.1, ptr noundef @n, ptr noundef @m, ptr noundef @x, ptr noundef @y)
  %9 = load i32, ptr @n, align 4, !tbaa !5
  %10 = sub nsw i32 %9, 1
  %11 = load i32, ptr @x, align 4, !tbaa !5
  %12 = srem i32 %10, %11
  %13 = icmp eq i32 %12, 0
  br i1 %13, label %14, label %20

14:                                               ; preds = %7
  %15 = load i32, ptr @m, align 4, !tbaa !5
  %16 = sub nsw i32 %15, 1
  %17 = load i32, ptr @y, align 4, !tbaa !5
  %18 = srem i32 %16, %17
  %19 = icmp eq i32 %18, 0
  br i1 %19, label %40, label %20

20:                                               ; preds = %14, %7
  %21 = load i32, ptr @n, align 4, !tbaa !5
  %22 = icmp sgt i32 %21, 1
  br i1 %22, label %23, label %38

23:                                               ; preds = %20
  %24 = load i32, ptr @n, align 4, !tbaa !5
  %25 = sub nsw i32 %24, 2
  %26 = load i32, ptr @x, align 4, !tbaa !5
  %27 = srem i32 %25, %26
  %28 = icmp eq i32 %27, 0
  br i1 %28, label %29, label %38

29:                                               ; preds = %23
  %30 = load i32, ptr @m, align 4, !tbaa !5
  %31 = icmp sgt i32 %30, 1
  br i1 %31, label %32, label %38

32:                                               ; preds = %29
  %33 = load i32, ptr @m, align 4, !tbaa !5
  %34 = sub nsw i32 %33, 2
  %35 = load i32, ptr @y, align 4, !tbaa !5
  %36 = srem i32 %34, %35
  %37 = icmp eq i32 %36, 0
  br label %38

38:                                               ; preds = %32, %29, %23, %20
  %39 = phi i1 [ false, %29 ], [ false, %23 ], [ false, %20 ], [ %37, %32 ]
  br label %40

40:                                               ; preds = %38, %14
  %41 = phi i1 [ true, %14 ], [ %39, %38 ]
  %42 = zext i1 %41 to i64
  %43 = select i1 %41, ptr @.str.2, ptr @.str.3
  %44 = call i32 @puts(ptr noundef %43)
  br label %3, !llvm.loop !9

45:                                               ; 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
@m = external dso_local global i32, align 4
@x = external dso_local global i32, align 4
@y = 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 [9 x i8], align 1
@.str.2 = external hidden unnamed_addr constant [11 x i8], align 1
@.str.3 = external hidden unnamed_addr constant [6 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
  %.not6 = icmp eq i32 %2, 0
  br i1 %.not6, label %._crit_edge, label %.lr.ph

.lr.ph:                                           ; preds = %0, %.thread
  %4 = tail call i32 (ptr, ...) @__isoc99_scanf(ptr noundef nonnull @.str.1, ptr noundef nonnull @n, ptr noundef nonnull @m, ptr noundef nonnull @x, ptr noundef nonnull @y)
  %5 = load i32, ptr @n, align 4, !tbaa !5
  %6 = add nsw i32 %5, -1
  %7 = load i32, ptr @x, align 4, !tbaa !5
  %8 = srem i32 %6, %7
  %9 = icmp eq i32 %8, 0
  br i1 %9, label %10, label %16

10:                                               ; preds = %.lr.ph
  %11 = load i32, ptr @m, align 4, !tbaa !5
  %12 = add nsw i32 %11, -1
  %13 = load i32, ptr @y, align 4, !tbaa !5
  %14 = srem i32 %12, %13
  %15 = icmp eq i32 %14, 0
  br i1 %15, label %.thread4, label %16

16:                                               ; preds = %10, %.lr.ph
  %17 = icmp sgt i32 %5, 1
  br i1 %17, label %18, label %.thread

18:                                               ; preds = %16
  %19 = add nsw i32 %5, -2
  %20 = srem i32 %19, %7
  %21 = icmp eq i32 %20, 0
  %22 = load i32, ptr @m, align 4
  %23 = icmp sgt i32 %22, 1
  %or.cond = select i1 %21, i1 %23, i1 false
  br i1 %or.cond, label %24, label %.thread

24:                                               ; preds = %18
  %25 = add nsw i32 %22, -2
  %26 = load i32, ptr @y, align 4, !tbaa !5
  %27 = srem i32 %25, %26
  %.fr = freeze i32 %27
  %28 = icmp eq i32 %.fr, 0
  br i1 %28, label %.thread4, label %.thread

.thread4:                                         ; preds = %10, %24
  br label %.thread

.thread:                                          ; preds = %16, %18, %24, %.thread4
  %29 = phi ptr [ @.str.2, %.thread4 ], [ @.str.3, %24 ], [ @.str.3, %18 ], [ @.str.3, %16 ]
  %30 = tail call i32 @puts(ptr noundef nonnull dereferenceable(1) %29)
  %31 = load i32, ptr @t, align 4, !tbaa !5
  %32 = add nsw i32 %31, -1
  store i32 %32, ptr @t, align 4, !tbaa !5
  %.not = icmp eq i32 %31, 0
  br i1 %.not, label %._crit_edge, label %.lr.ph, !llvm.loop !9

._crit_edge:                                      ; preds = %.thread, %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,GlobalOptPass,IPSCCPPass,InferFunctionAttrsPass,InstCombinePass,JumpThreadingPass,LoopRotatePass,LoopSimplifyPass,LoopUnrollPass,PostOrderFunctionAttrsPass,SROAPass,SimplifyCFGPass,TailCallElimPass