; LLVM IR from tangjz/acm-icpc :: TDL_training/2015-11-29/upsolved (G - Laptop - tjz)

; 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"

%"struct.std::pair" = type { i32, i32 }

@t = external dso_local global i32, align 4
@n = external dso_local global i32, align 4
@L = external dso_local global i32, align 4
@R = external dso_local global i32, align 4
@ans = external dso_local global i32, align 4
@p = external dso_local global [100001 x %"struct.std::pair"], align 16
@.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 [4 x i8], align 1

; Function Attrs: mustprogress norecurse uwtable
define dso_local noundef i32 @main() #0 {
  %1 = alloca i32, align 4
  %2 = alloca i32, align 4
  %3 = alloca i32, align 4
  %4 = alloca i32, align 4
  %5 = alloca i32, align 4
  store i32 0, ptr %1, align 4
  %6 = call i32 (ptr, ...) @__isoc99_scanf(ptr noundef @.str, ptr noundef @t)
  br label %7

7:                                                ; preds = %82, %0
  %8 = load i32, ptr @t, align 4, !tbaa !5
  %9 = add nsw i32 %8, -1
  store i32 %9, ptr @t, align 4, !tbaa !5
  %10 = icmp ne i32 %8, 0
  br i1 %10, label %11, label %85

11:                                               ; preds = %7
  %12 = call i32 (ptr, ...) @__isoc99_scanf(ptr noundef @.str, ptr noundef @n)
  call void @llvm.lifetime.start.p0(i64 4, ptr %2) #5
  store i32 0, ptr %2, align 4, !tbaa !5
  br label %13

13:                                               ; preds = %28, %11
  %14 = load i32, ptr %2, align 4, !tbaa !5
  %15 = load i32, ptr @n, align 4, !tbaa !5
  %16 = icmp slt i32 %14, %15
  br i1 %16, label %18, label %17

17:                                               ; preds = %13
  call void @llvm.lifetime.end.p0(i64 4, ptr %2) #5
  br label %31

18:                                               ; preds = %13
  %19 = load i32, ptr %2, align 4, !tbaa !5
  %20 = sext i32 %19 to i64
  %21 = getelementptr inbounds [100001 x %"struct.std::pair"], ptr @p, i64 0, i64 %20
  %22 = getelementptr inbounds %"struct.std::pair", ptr %21, i32 0, i32 0
  %23 = load i32, ptr %2, align 4, !tbaa !5
  %24 = sext i32 %23 to i64
  %25 = getelementptr inbounds [100001 x %"struct.std::pair"], ptr @p, i64 0, i64 %24
  %26 = getelementptr inbounds %"struct.std::pair", ptr %25, i32 0, i32 1
  %27 = call i32 (ptr, ...) @__isoc99_scanf(ptr noundef @.str.1, ptr noundef %22, ptr noundef %26)
  br label %28

28:                                               ; preds = %18
  %29 = load i32, ptr %2, align 4, !tbaa !5
  %30 = add nsw i32 %29, 1
  store i32 %30, ptr %2, align 4, !tbaa !5
  br label %13, !llvm.loop !9

31:                                               ; preds = %17
  %32 = load i32, ptr @n, align 4, !tbaa !5
  %33 = sext i32 %32 to i64
  %34 = getelementptr inbounds %"struct.std::pair", ptr @p, i64 %33
  call void @_ZSt4sortIPSt4pairIiiEEvT_S3_(ptr noundef @p, ptr noundef %34)
  store i32 -1, ptr @ans, align 4, !tbaa !5
  store i32 -1, ptr @R, align 4, !tbaa !5
  store i32 -1, ptr @L, align 4, !tbaa !5
  call void @llvm.lifetime.start.p0(i64 4, ptr %3) #5
  store i32 0, ptr %3, align 4, !tbaa !5
  br label %35

35:                                               ; preds = %79, %31
  %36 = load i32, ptr %3, align 4, !tbaa !5
  %37 = load i32, ptr @n, align 4, !tbaa !5
  %38 = icmp slt i32 %36, %37
  br i1 %38, label %40, label %39

39:                                               ; preds = %35
  call void @llvm.lifetime.end.p0(i64 4, ptr %3) #5
  br label %82

40:                                               ; preds = %35
  %41 = load i32, ptr %3, align 4, !tbaa !5
  %42 = sext i32 %41 to i64
  %43 = getelementptr inbounds [100001 x %"struct.std::pair"], ptr @p, i64 0, i64 %42
  %44 = getelementptr inbounds %"struct.std::pair", ptr %43, i32 0, i32 0
  %45 = load i32, ptr %44, align 8, !tbaa !11
  %46 = load i32, ptr @R, align 4, !tbaa !5
  %47 = icmp sle i32 %45, %46
  br i1 %47, label %48, label %65

48:                                               ; preds = %40
  call void @llvm.lifetime.start.p0(i64 4, ptr %4) #5
  %49 = load i32, ptr @L, align 4, !tbaa !5
  %50 = add nsw i32 %49, 1
  store i32 %50, ptr %4, align 4, !tbaa !5
  %51 = load i32, ptr %3, align 4, !tbaa !5
  %52 = sext i32 %51 to i64
  %53 = getelementptr inbounds [100001 x %"struct.std::pair"], ptr @p, i64 0, i64 %52
  %54 = getelementptr inbounds %"struct.std::pair", ptr %53, i32 0, i32 0
  %55 = call noundef nonnull align 4 dereferenceable(4) ptr @_ZSt3minIiERKT_S2_S2_(ptr noundef nonnull align 4 dereferenceable(4) %4, ptr noundef nonnull align 4 dereferenceable(4) %54)
  %56 = load i32, ptr %55, align 4, !tbaa !5
  store i32 %56, ptr @L, align 4, !tbaa !5
  call void @llvm.lifetime.end.p0(i64 4, ptr %4) #5
  call void @llvm.lifetime.start.p0(i64 4, ptr %5) #5
  %57 = load i32, ptr @R, align 4, !tbaa !5
  %58 = add nsw i32 %57, 1
  store i32 %58, ptr %5, align 4, !tbaa !5
  %59 = load i32, ptr %3, align 4, !tbaa !5
  %60 = sext i32 %59 to i64
  %61 = getelementptr inbounds [100001 x %"struct.std::pair"], ptr @p, i64 0, i64 %60
  %62 = getelementptr inbounds %"struct.std::pair", ptr %61, i32 0, i32 1
  %63 = call noundef nonnull align 4 dereferenceable(4) ptr @_ZSt3minIiERKT_S2_S2_(ptr noundef nonnull align 4 dereferenceable(4) %5, ptr noundef nonnull align 4 dereferenceable(4) %62)
  %64 = load i32, ptr %63, align 4, !tbaa !5
  store i32 %64, ptr @R, align 4, !tbaa !5
  call void @llvm.lifetime.end.p0(i64 4, ptr %5) #5
  br label %78

65:                                               ; preds = %40
  %66 = load i32, ptr %3, align 4, !tbaa !5
  %67 = sext i32 %66 to i64
  %68 = getelementptr inbounds [100001 x %"struct.std::pair"], ptr @p, i64 0, i64 %67
  %69 = getelementptr inbounds %"struct.std::pair", ptr %68, i32 0, i32 0
  %70 = load i32, ptr %69, align 8, !tbaa !11
  store i32 %70, ptr @L, align 4, !tbaa !5
  %71 = load i32, ptr %3, align 4, !tbaa !5
  %72 = sext i32 %71 to i64
  %73 = getelementptr inbounds [100001 x %"struct.std::pair"], ptr @p, i64 0, i64 %72
  %74 = getelementptr inbounds %"struct.std::pair", ptr %73, i32 0, i32 1
  %75 = load i32, ptr %74, align 4, !tbaa !13
  store i32 %75, ptr @R, align 4, !tbaa !5
  %76 = load i32, ptr @ans, align 4, !tbaa !5
  %77 = add nsw i32 %76, 1
  store i32 %77, ptr @ans, align 4, !tbaa !5
  br label %78

78:                                               ; preds = %65, %48
  br label %79

79:                                               ; preds = %78
  %80 = load i32, ptr %3, align 4, !tbaa !5
  %81 = add nsw i32 %80, 1
  store i32 %81, ptr %3, align 4, !tbaa !5
  br label %35, !llvm.loop !14

82:                                               ; preds = %39
  %83 = load i32, ptr @ans, align 4, !tbaa !5
  %84 = call i32 (ptr, ...) @printf(ptr noundef @.str.2, i32 noundef %83)
  br label %7, !llvm.loop !15

85:                                               ; preds = %7
  ret i32 0
}

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

; Function Attrs: nocallback nofree nosync nounwind willreturn memory(argmem: readwrite)
declare void @llvm.lifetime.start.p0(i64 immarg, ptr nocapture) #2

; Function Attrs: nocallback nofree nosync nounwind willreturn memory(argmem: readwrite)
declare void @llvm.lifetime.end.p0(i64 immarg, ptr nocapture) #2

; Function Attrs: inlinehint mustprogress uwtable
declare dso_local void @_ZSt4sortIPSt4pairIiiEEvT_S3_(ptr noundef, ptr noundef) #3

; Function Attrs: inlinehint mustprogress nounwind uwtable
declare dso_local noundef nonnull align 4 dereferenceable(4) ptr @_ZSt3minIiERKT_S2_S2_(ptr noundef nonnull align 4 dereferenceable(4), ptr noundef nonnull align 4 dereferenceable(4)) #4

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" }
attributes #2 = { nocallback nofree nosync nounwind willreturn memory(argmem: readwrite) }
attributes #3 = { inlinehint 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 #4 = { inlinehint mustprogress 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 #5 = { 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"}
!11 = !{!12, !6, i64 0}
!12 = !{!"_ZTSSt4pairIiiE", !6, i64 0, !6, i64 4}
!13 = !{!12, !6, i64 4}
!14 = distinct !{!14, !10}
!15 = distinct !{!15, !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"

%"struct.std::pair" = type { i32, i32 }

@t = external dso_local global i32, align 4
@n = external dso_local global i32, align 4
@L = external dso_local local_unnamed_addr global i32, align 4
@R = external dso_local local_unnamed_addr global i32, align 4
@ans = external dso_local local_unnamed_addr global i32, align 4
@p = external dso_local global [100001 x %"struct.std::pair"], align 16
@.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 [4 x i8], align 1

; Function Attrs: mustprogress norecurse uwtable
define dso_local noundef i32 @main() local_unnamed_addr #0 {
  %1 = alloca i32, align 4
  %2 = alloca i32, align 4
  %3 = tail call i32 (ptr, ...) @__isoc99_scanf(ptr noundef nonnull @.str, ptr noundef nonnull @t)
  %4 = load i32, ptr @t, align 4, !tbaa !5
  %5 = add nsw i32 %4, -1
  store i32 %5, ptr @t, align 4, !tbaa !5
  %.not20 = icmp eq i32 %4, 0
  br i1 %.not20, label %._crit_edge23, label %.lr.ph22

.lr.ph22:                                         ; preds = %0, %._crit_edge19
  %6 = call i32 (ptr, ...) @__isoc99_scanf(ptr noundef nonnull @.str, ptr noundef nonnull @n)
  %7 = load i32, ptr @n, align 4, !tbaa !5
  %8 = icmp sgt i32 %7, 0
  br i1 %8, label %.lr.ph, label %.lr.ph22.._crit_edge_crit_edge

.lr.ph22.._crit_edge_crit_edge:                   ; preds = %.lr.ph22
  %.pre30 = sext i32 %7 to i64
  br label %._crit_edge

._crit_edge:                                      ; preds = %.lr.ph, %.lr.ph22.._crit_edge_crit_edge
  %.pre-phi = phi i64 [ %.pre30, %.lr.ph22.._crit_edge_crit_edge ], [ %16, %.lr.ph ]
  %9 = getelementptr inbounds %"struct.std::pair", ptr @p, i64 %.pre-phi
  call void @_ZSt4sortIPSt4pairIiiEEvT_S3_(ptr noundef nonnull @p, ptr noundef nonnull %9)
  store i32 -1, ptr @ans, align 4, !tbaa !5
  store i32 -1, ptr @R, align 4, !tbaa !5
  store i32 -1, ptr @L, align 4, !tbaa !5
  %10 = load i32, ptr @n, align 4, !tbaa !5
  %11 = icmp sgt i32 %10, 0
  br i1 %11, label %.lr.ph18, label %._crit_edge19

.lr.ph:                                           ; preds = %.lr.ph22, %.lr.ph
  %indvars.iv = phi i64 [ %indvars.iv.next, %.lr.ph ], [ 0, %.lr.ph22 ]
  %12 = getelementptr inbounds [100001 x %"struct.std::pair"], ptr @p, i64 0, i64 %indvars.iv
  %13 = getelementptr inbounds i8, ptr %12, i64 4
  %14 = call i32 (ptr, ...) @__isoc99_scanf(ptr noundef nonnull @.str.1, ptr noundef nonnull %12, ptr noundef nonnull %13)
  %indvars.iv.next = add nuw nsw i64 %indvars.iv, 1
  %15 = load i32, ptr @n, align 4, !tbaa !5
  %16 = sext i32 %15 to i64
  %17 = icmp slt i64 %indvars.iv.next, %16
  br i1 %17, label %.lr.ph, label %._crit_edge, !llvm.loop !9

._crit_edge19.loopexit:                           ; preds = %41
  %.pre29 = load i32, ptr @ans, align 4, !tbaa !5
  br label %._crit_edge19

._crit_edge19:                                    ; preds = %._crit_edge19.loopexit, %._crit_edge
  %18 = phi i32 [ %.pre29, %._crit_edge19.loopexit ], [ -1, %._crit_edge ]
  %19 = call i32 (ptr, ...) @printf(ptr noundef nonnull dereferenceable(1) @.str.2, i32 noundef %18)
  %20 = load i32, ptr @t, align 4, !tbaa !5
  %21 = add nsw i32 %20, -1
  store i32 %21, ptr @t, align 4, !tbaa !5
  %.not = icmp eq i32 %20, 0
  br i1 %.not, label %._crit_edge23, label %.lr.ph22, !llvm.loop !11

.lr.ph18:                                         ; preds = %._crit_edge, %41
  %22 = phi i32 [ %42, %41 ], [ %10, %._crit_edge ]
  %23 = phi i32 [ %.sink, %41 ], [ -1, %._crit_edge ]
  %indvars.iv26 = phi i64 [ %indvars.iv.next27, %41 ], [ 0, %._crit_edge ]
  %24 = getelementptr inbounds [100001 x %"struct.std::pair"], ptr @p, i64 0, i64 %indvars.iv26
  %25 = load i32, ptr %24, align 8, !tbaa !12
  %.not14 = icmp sgt i32 %25, %23
  br i1 %.not14, label %36, label %26

26:                                               ; preds = %.lr.ph18
  call void @llvm.lifetime.start.p0(i64 4, ptr nonnull %1) #5
  %27 = load i32, ptr @L, align 4, !tbaa !5
  %28 = add nsw i32 %27, 1
  store i32 %28, ptr %1, align 4, !tbaa !5
  %29 = call noundef nonnull align 4 dereferenceable(4) ptr @_ZSt3minIiERKT_S2_S2_(ptr noundef nonnull align 4 dereferenceable(4) %1, ptr noundef nonnull align 4 dereferenceable(4) %24)
  %30 = load i32, ptr %29, align 4, !tbaa !5
  store i32 %30, ptr @L, align 4, !tbaa !5
  call void @llvm.lifetime.end.p0(i64 4, ptr nonnull %1) #5
  call void @llvm.lifetime.start.p0(i64 4, ptr nonnull %2) #5
  %31 = load i32, ptr @R, align 4, !tbaa !5
  %32 = add nsw i32 %31, 1
  store i32 %32, ptr %2, align 4, !tbaa !5
  %33 = getelementptr inbounds i8, ptr %24, i64 4
  %34 = call noundef nonnull align 4 dereferenceable(4) ptr @_ZSt3minIiERKT_S2_S2_(ptr noundef nonnull align 4 dereferenceable(4) %2, ptr noundef nonnull align 4 dereferenceable(4) %33)
  %35 = load i32, ptr %34, align 4, !tbaa !5
  call void @llvm.lifetime.end.p0(i64 4, ptr nonnull %2) #5
  %.pre = load i32, ptr @n, align 4, !tbaa !5
  br label %41

36:                                               ; preds = %.lr.ph18
  store i32 %25, ptr @L, align 4, !tbaa !5
  %37 = getelementptr inbounds i8, ptr %24, i64 4
  %38 = load i32, ptr %37, align 4, !tbaa !14
  %39 = load i32, ptr @ans, align 4, !tbaa !5
  %40 = add nsw i32 %39, 1
  store i32 %40, ptr @ans, align 4, !tbaa !5
  br label %41

41:                                               ; preds = %26, %36
  %42 = phi i32 [ %22, %36 ], [ %.pre, %26 ]
  %.sink = phi i32 [ %38, %36 ], [ %35, %26 ]
  store i32 %.sink, ptr @R, align 4
  %indvars.iv.next27 = add nuw nsw i64 %indvars.iv26, 1
  %43 = sext i32 %42 to i64
  %44 = icmp slt i64 %indvars.iv.next27, %43
  br i1 %44, label %.lr.ph18, label %._crit_edge19.loopexit, !llvm.loop !15

._crit_edge23:                                    ; preds = %._crit_edge19, %0
  ret i32 0
}

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

; Function Attrs: mustprogress nocallback nofree nosync nounwind willreturn memory(argmem: readwrite)
declare void @llvm.lifetime.start.p0(i64 immarg, ptr nocapture) #2

; Function Attrs: mustprogress nocallback nofree nosync nounwind willreturn memory(argmem: readwrite)
declare void @llvm.lifetime.end.p0(i64 immarg, ptr nocapture) #2

; Function Attrs: inlinehint mustprogress uwtable
declare dso_local void @_ZSt4sortIPSt4pairIiiEEvT_S3_(ptr noundef, ptr noundef) local_unnamed_addr #3

; Function Attrs: inlinehint mustprogress nounwind uwtable
declare dso_local noundef nonnull align 4 dereferenceable(4) ptr @_ZSt3minIiERKT_S2_S2_(ptr noundef nonnull align 4 dereferenceable(4), ptr noundef nonnull align 4 dereferenceable(4)) local_unnamed_addr #4

; Function Attrs: nofree nounwind
declare noundef i32 @printf(ptr nocapture noundef readonly, ...) local_unnamed_addr #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 = { 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 nocallback nofree nosync nounwind willreturn memory(argmem: readwrite) }
attributes #3 = { inlinehint 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 #4 = { inlinehint mustprogress 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 #5 = { 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"}
!11 = distinct !{!11, !10}
!12 = !{!13, !6, i64 0}
!13 = !{!"_ZTSSt4pairIiiE", !6, i64 0, !6, i64 4}
!14 = !{!13, !6, i64 4}
!15 = distinct !{!15, !10}


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