; LLVM IR from tangjz/acm-icpc :: TDL_training/2016-04-24 (D - Pocket Money - lzy)

; 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"

@n = external dso_local global i32, align 4
@a = external dso_local global i32, align 4
@s = external dso_local global i32, align 4
@b = 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 [4 x i8], align 1
@.str.2 = external hidden unnamed_addr constant [9 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 @n)
  store i32 1009, ptr @b, align 4, !tbaa !5
  br label %3

3:                                                ; preds = %21, %0
  %4 = load i32, ptr @n, align 4, !tbaa !5
  %5 = add nsw i32 %4, -1
  store i32 %5, ptr @n, align 4, !tbaa !5
  %6 = icmp ne i32 %4, 0
  br i1 %6, label %7, label %22

7:                                                ; preds = %3
  %8 = call i32 (ptr, ...) @__isoc99_scanf(ptr noundef @.str, ptr noundef @a)
  %9 = load i32, ptr @a, align 4, !tbaa !5
  %10 = load i32, ptr @s, align 4, !tbaa !5
  %11 = add nsw i32 %10, %9
  store i32 %11, ptr @s, align 4, !tbaa !5
  %12 = load i32, ptr @a, align 4, !tbaa !5
  %13 = and i32 %12, 1
  %14 = icmp ne i32 %13, 0
  br i1 %14, label %15, label %21

15:                                               ; preds = %7
  %16 = load i32, ptr @b, align 4, !tbaa !5
  %17 = load i32, ptr @a, align 4, !tbaa !5
  %18 = icmp sgt i32 %16, %17
  br i1 %18, label %19, label %21

19:                                               ; preds = %15
  %20 = load i32, ptr @a, align 4, !tbaa !5
  store i32 %20, ptr @b, align 4, !tbaa !5
  br label %21

21:                                               ; preds = %19, %15, %7
  br label %3, !llvm.loop !9

22:                                               ; preds = %3
  %23 = load i32, ptr @s, align 4, !tbaa !5
  %24 = and i32 %23, 1
  %25 = icmp ne i32 %24, 0
  br i1 %25, label %26, label %30

26:                                               ; preds = %22
  %27 = load i32, ptr @b, align 4, !tbaa !5
  %28 = load i32, ptr @s, align 4, !tbaa !5
  %29 = sub nsw i32 %28, %27
  store i32 %29, ptr @s, align 4, !tbaa !5
  br label %30

30:                                               ; preds = %26, %22
  %31 = load i32, ptr @s, align 4, !tbaa !5
  %32 = icmp ne i32 %31, 0
  br i1 %32, label %33, label %36

33:                                               ; preds = %30
  %34 = load i32, ptr @s, align 4, !tbaa !5
  %35 = call i32 (ptr, ...) @printf(ptr noundef @.str.1, i32 noundef %34)
  br label %38

36:                                               ; preds = %30
  %37 = call i32 @puts(ptr noundef @.str.2)
  br label %38

38:                                               ; preds = %36, %33
  ret i32 0
}

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

declare i32 @printf(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"

@n = external dso_local global i32, align 4
@a = external dso_local global i32, align 4
@s = external dso_local local_unnamed_addr global i32, align 4
@b = external dso_local local_unnamed_addr global i32, align 4
@.str = external hidden unnamed_addr constant [3 x i8], align 1
@.str.1 = external hidden unnamed_addr constant [4 x i8], align 1
@.str.2 = external hidden unnamed_addr constant [9 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 @n)
  store i32 1009, ptr @b, align 4, !tbaa !5
  %2 = load i32, ptr @n, align 4, !tbaa !5
  %3 = add nsw i32 %2, -1
  store i32 %3, ptr @n, align 4, !tbaa !5
  %.not6 = icmp eq i32 %2, 0
  br i1 %.not6, label %.._crit_edge_crit_edge, label %.lr.ph

.._crit_edge_crit_edge:                           ; preds = %0
  %.pre = load i32, ptr @s, align 4, !tbaa !5
  br label %._crit_edge

.lr.ph:                                           ; preds = %0, %12
  %4 = tail call i32 (ptr, ...) @__isoc99_scanf(ptr noundef nonnull @.str, ptr noundef nonnull @a)
  %5 = load i32, ptr @a, align 4, !tbaa !5
  %6 = load i32, ptr @s, align 4, !tbaa !5
  %7 = add nsw i32 %6, %5
  store i32 %7, ptr @s, align 4, !tbaa !5
  %8 = and i32 %5, 1
  %.not4 = icmp ne i32 %8, 0
  %9 = load i32, ptr @b, align 4
  %10 = icmp sgt i32 %9, %5
  %or.cond = select i1 %.not4, i1 %10, i1 false
  br i1 %or.cond, label %11, label %12

11:                                               ; preds = %.lr.ph
  store i32 %5, ptr @b, align 4, !tbaa !5
  br label %12

12:                                               ; preds = %11, %.lr.ph
  %13 = phi i32 [ %5, %11 ], [ %9, %.lr.ph ]
  %14 = load i32, ptr @n, align 4, !tbaa !5
  %15 = add nsw i32 %14, -1
  store i32 %15, ptr @n, align 4, !tbaa !5
  %.not = icmp eq i32 %14, 0
  br i1 %.not, label %._crit_edge, label %.lr.ph, !llvm.loop !9

._crit_edge:                                      ; preds = %12, %.._crit_edge_crit_edge
  %16 = phi i32 [ 1009, %.._crit_edge_crit_edge ], [ %13, %12 ]
  %17 = phi i32 [ %.pre, %.._crit_edge_crit_edge ], [ %7, %12 ]
  %18 = and i32 %17, 1
  %.not2 = icmp eq i32 %18, 0
  br i1 %.not2, label %21, label %19

19:                                               ; preds = %._crit_edge
  %20 = sub nsw i32 %17, %16
  store i32 %20, ptr @s, align 4, !tbaa !5
  br label %21

21:                                               ; preds = %19, %._crit_edge
  %22 = phi i32 [ %20, %19 ], [ %17, %._crit_edge ]
  %.not3 = icmp eq i32 %22, 0
  br i1 %.not3, label %25, label %23

23:                                               ; preds = %21
  %24 = tail call i32 (ptr, ...) @printf(ptr noundef nonnull dereferenceable(1) @.str.1, i32 noundef %22)
  br label %27

25:                                               ; preds = %21
  %26 = tail call i32 @puts(ptr noundef nonnull dereferenceable(1) @.str.2)
  br label %27

27:                                               ; preds = %25, %23
  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

; 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,InstSimplifyPass,JumpThreadingPass,LCSSAPass,LoopRotatePass,LoopSimplifyPass,LoopUnrollPass,PostOrderFunctionAttrsPass,SROAPass,SimplifyCFGPass,TailCallElimPass