; LLVM IR from Izaron/ACM-ICPC :: Timus Online Judge/Volume 6/1537. Ents (main)

; 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"

@.str = external hidden unnamed_addr constant [5 x i8], align 1
@.str.1 = external hidden unnamed_addr constant [2 x i8], align 1
@.str.2 = external hidden unnamed_addr constant [3 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 ptr, align 8
  store i32 0, ptr %1, align 4
  call void @llvm.lifetime.start.p0(i64 4, ptr %2) #5
  call void @llvm.lifetime.start.p0(i64 4, ptr %3) #5
  call void @llvm.lifetime.start.p0(i64 4, ptr %4) #5
  call void @llvm.lifetime.start.p0(i64 8, ptr %5) #5
  %6 = call i32 (ptr, ...) @__isoc99_scanf(ptr noundef @.str, ptr noundef %2, ptr noundef %3)
  %7 = load i32, ptr %2, align 4, !tbaa !5
  %8 = icmp slt i32 %7, 2
  br i1 %8, label %9, label %11

9:                                                ; preds = %0
  %10 = call i32 (ptr, ...) @printf(ptr noundef @.str.1)
  br label %92

11:                                               ; preds = %0
  %12 = load i32, ptr %2, align 4, !tbaa !5
  %13 = add nsw i32 %12, 3
  %14 = sext i32 %13 to i64
  %15 = call { i64, i1 } @llvm.umul.with.overflow.i64(i64 %14, i64 4)
  %16 = extractvalue { i64, i1 } %15, 1
  %17 = extractvalue { i64, i1 } %15, 0
  %18 = select i1 %16, i64 -1, i64 %17
  %19 = call noalias noundef nonnull ptr @_Znam(i64 noundef %18) #6
  store ptr %19, ptr %5, align 8, !tbaa !9
  %20 = load i32, ptr %3, align 4, !tbaa !5
  %21 = srem i32 1, %20
  %22 = load ptr, ptr %5, align 8, !tbaa !9
  %23 = getelementptr inbounds i32, ptr %22, i64 2
  store i32 %21, ptr %23, align 4, !tbaa !5
  store i32 3, ptr %4, align 4, !tbaa !5
  br label %24

24:                                               ; preds = %82, %11
  %25 = load i32, ptr %4, align 4, !tbaa !5
  %26 = load i32, ptr %2, align 4, !tbaa !5
  %27 = icmp sle i32 %25, %26
  br i1 %27, label %28, label %85

28:                                               ; preds = %24
  %29 = load i32, ptr %4, align 4, !tbaa !5
  %30 = and i32 %29, 1
  %31 = icmp eq i32 %30, 1
  br i1 %31, label %32, label %43

32:                                               ; preds = %28
  %33 = load ptr, ptr %5, align 8, !tbaa !9
  %34 = load i32, ptr %4, align 4, !tbaa !5
  %35 = sub nsw i32 %34, 1
  %36 = sext i32 %35 to i64
  %37 = getelementptr inbounds i32, ptr %33, i64 %36
  %38 = load i32, ptr %37, align 4, !tbaa !5
  %39 = load ptr, ptr %5, align 8, !tbaa !9
  %40 = load i32, ptr %4, align 4, !tbaa !5
  %41 = sext i32 %40 to i64
  %42 = getelementptr inbounds i32, ptr %39, i64 %41
  store i32 %38, ptr %42, align 4, !tbaa !5
  br label %61

43:                                               ; preds = %28
  %44 = load ptr, ptr %5, align 8, !tbaa !9
  %45 = load i32, ptr %4, align 4, !tbaa !5
  %46 = sub nsw i32 %45, 1
  %47 = sext i32 %46 to i64
  %48 = getelementptr inbounds i32, ptr %44, i64 %47
  %49 = load i32, ptr %48, align 4, !tbaa !5
  %50 = load ptr, ptr %5, align 8, !tbaa !9
  %51 = load i32, ptr %4, align 4, !tbaa !5
  %52 = sdiv i32 %51, 2
  %53 = sext i32 %52 to i64
  %54 = getelementptr inbounds i32, ptr %50, i64 %53
  %55 = load i32, ptr %54, align 4, !tbaa !5
  %56 = add nsw i32 %49, %55
  %57 = load ptr, ptr %5, align 8, !tbaa !9
  %58 = load i32, ptr %4, align 4, !tbaa !5
  %59 = sext i32 %58 to i64
  %60 = getelementptr inbounds i32, ptr %57, i64 %59
  store i32 %56, ptr %60, align 4, !tbaa !5
  br label %61

61:                                               ; preds = %43, %32
  %62 = load ptr, ptr %5, align 8, !tbaa !9
  %63 = load i32, ptr %4, align 4, !tbaa !5
  %64 = sext i32 %63 to i64
  %65 = getelementptr inbounds i32, ptr %62, i64 %64
  %66 = load i32, ptr %65, align 4, !tbaa !5
  %67 = load i32, ptr %3, align 4, !tbaa !5
  %68 = icmp sge i32 %66, %67
  br i1 %68, label %69, label %81

69:                                               ; preds = %61
  %70 = load ptr, ptr %5, align 8, !tbaa !9
  %71 = load i32, ptr %4, align 4, !tbaa !5
  %72 = sext i32 %71 to i64
  %73 = getelementptr inbounds i32, ptr %70, i64 %72
  %74 = load i32, ptr %73, align 4, !tbaa !5
  %75 = load i32, ptr %3, align 4, !tbaa !5
  %76 = sub nsw i32 %74, %75
  %77 = load ptr, ptr %5, align 8, !tbaa !9
  %78 = load i32, ptr %4, align 4, !tbaa !5
  %79 = sext i32 %78 to i64
  %80 = getelementptr inbounds i32, ptr %77, i64 %79
  store i32 %76, ptr %80, align 4, !tbaa !5
  br label %81

81:                                               ; preds = %69, %61
  br label %82

82:                                               ; preds = %81
  %83 = load i32, ptr %4, align 4, !tbaa !5
  %84 = add nsw i32 %83, 1
  store i32 %84, ptr %4, align 4, !tbaa !5
  br label %24, !llvm.loop !11

85:                                               ; preds = %24
  %86 = load ptr, ptr %5, align 8, !tbaa !9
  %87 = load i32, ptr %2, align 4, !tbaa !5
  %88 = sext i32 %87 to i64
  %89 = getelementptr inbounds i32, ptr %86, i64 %88
  %90 = load i32, ptr %89, align 4, !tbaa !5
  %91 = call i32 (ptr, ...) @printf(ptr noundef @.str.2, i32 noundef %90)
  br label %92

92:                                               ; preds = %85, %9
  call void @llvm.lifetime.end.p0(i64 8, ptr %5) #5
  call void @llvm.lifetime.end.p0(i64 4, ptr %4) #5
  call void @llvm.lifetime.end.p0(i64 4, ptr %3) #5
  call void @llvm.lifetime.end.p0(i64 4, ptr %2) #5
  %93 = load i32, ptr %1, align 4
  ret i32 %93
}

; Function Attrs: nocallback nofree nosync nounwind willreturn memory(argmem: readwrite)
declare void @llvm.lifetime.start.p0(i64 immarg, ptr nocapture) #1

declare i32 @__isoc99_scanf(ptr noundef, ...) #2

declare i32 @printf(ptr noundef, ...) #2

; Function Attrs: nocallback nofree nosync nounwind speculatable willreturn memory(none)
declare { i64, i1 } @llvm.umul.with.overflow.i64(i64, i64) #3

; Function Attrs: nobuiltin allocsize(0)
declare noundef nonnull ptr @_Znam(i64 noundef) #4

; Function Attrs: nocallback nofree nosync nounwind willreturn memory(argmem: readwrite)
declare void @llvm.lifetime.end.p0(i64 immarg, ptr nocapture) #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 = { nocallback nofree nosync nounwind willreturn memory(argmem: readwrite) }
attributes #2 = { "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 #3 = { nocallback nofree nosync nounwind speculatable willreturn memory(none) }
attributes #4 = { nobuiltin allocsize(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 }
attributes #6 = { builtin allocsize(0) }

!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 = !{!10, !10, i64 0}
!10 = !{!"any pointer", !7, i64 0}
!11 = distinct !{!11, !12}
!12 = !{!"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"

@.str = external hidden unnamed_addr constant [5 x i8], align 1
@.str.1 = external hidden unnamed_addr constant [2 x i8], align 1
@.str.2 = external hidden unnamed_addr constant [3 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
  call void @llvm.lifetime.start.p0(i64 4, ptr nonnull %1) #4
  call void @llvm.lifetime.start.p0(i64 4, ptr nonnull %2) #4
  %3 = call i32 (ptr, ...) @__isoc99_scanf(ptr noundef nonnull @.str, ptr noundef nonnull %1, ptr noundef nonnull %2)
  %4 = load i32, ptr %1, align 4, !tbaa !5
  %5 = icmp slt i32 %4, 2
  br i1 %5, label %6, label %8

6:                                                ; preds = %0
  %7 = call i32 (ptr, ...) @printf(ptr noundef nonnull dereferenceable(1) @.str.1)
  br label %36

8:                                                ; preds = %0
  %9 = add nuw nsw i32 %4, 3
  %10 = zext nneg i32 %9 to i64
  %11 = shl nuw nsw i64 %10, 2
  %12 = call noalias noundef nonnull ptr @_Znam(i64 noundef %11) #5
  %13 = load i32, ptr %2, align 4, !tbaa !5
  %14 = srem i32 1, %13
  %15 = getelementptr inbounds i8, ptr %12, i64 8
  store i32 %14, ptr %15, align 4, !tbaa !5
  %.not27 = icmp eq i32 %4, 2
  br i1 %.not27, label %._crit_edge, label %.lr.ph.preheader

.lr.ph.preheader:                                 ; preds = %8
  %16 = add nuw i32 %4, 1
  %wide.trip.count = zext i32 %16 to i64
  br label %.lr.ph

.lr.ph:                                           ; preds = %.lr.ph.preheader, %31
  %indvars.iv = phi i64 [ 3, %.lr.ph.preheader ], [ %indvars.iv.next, %31 ]
  %17 = and i64 %indvars.iv, 1
  %.not25 = icmp eq i64 %17, 0
  %18 = getelementptr i32, ptr %12, i64 %indvars.iv
  %19 = getelementptr i8, ptr %18, i64 -4
  %20 = load i32, ptr %19, align 4, !tbaa !5
  br i1 %.not25, label %21, label %27

21:                                               ; preds = %.lr.ph
  %22 = lshr exact i64 %indvars.iv, 1
  %23 = and i64 %22, 2147483647
  %24 = getelementptr inbounds i32, ptr %12, i64 %23
  %25 = load i32, ptr %24, align 4, !tbaa !5
  %26 = add nsw i32 %25, %20
  br label %27

27:                                               ; preds = %.lr.ph, %21
  %.sink = phi i32 [ %26, %21 ], [ %20, %.lr.ph ]
  store i32 %.sink, ptr %18, align 4, !tbaa !5
  %.not26 = icmp slt i32 %.sink, %13
  br i1 %.not26, label %31, label %28

28:                                               ; preds = %27
  %29 = getelementptr inbounds i32, ptr %12, i64 %indvars.iv
  %30 = sub nsw i32 %.sink, %13
  store i32 %30, ptr %29, align 4, !tbaa !5
  br label %31

31:                                               ; preds = %27, %28
  %indvars.iv.next = add nuw nsw i64 %indvars.iv, 1
  %exitcond.not = icmp eq i64 %indvars.iv.next, %wide.trip.count
  br i1 %exitcond.not, label %._crit_edge, label %.lr.ph, !llvm.loop !9

._crit_edge:                                      ; preds = %31, %8
  %32 = zext nneg i32 %4 to i64
  %33 = getelementptr inbounds i32, ptr %12, i64 %32
  %34 = load i32, ptr %33, align 4, !tbaa !5
  %35 = call i32 (ptr, ...) @printf(ptr noundef nonnull dereferenceable(1) @.str.2, i32 noundef %34)
  br label %36

36:                                               ; preds = %._crit_edge, %6
  call void @llvm.lifetime.end.p0(i64 4, ptr nonnull %2) #4
  call void @llvm.lifetime.end.p0(i64 4, ptr nonnull %1) #4
  ret i32 0
}

; Function Attrs: mustprogress nocallback nofree nosync nounwind willreturn memory(argmem: readwrite)
declare void @llvm.lifetime.start.p0(i64 immarg, ptr nocapture) #1

; Function Attrs: nofree nounwind
declare noundef i32 @__isoc99_scanf(ptr nocapture noundef readonly, ...) local_unnamed_addr #2

; Function Attrs: nofree nounwind
declare noundef i32 @printf(ptr nocapture noundef readonly, ...) local_unnamed_addr #2

; Function Attrs: nobuiltin allocsize(0)
declare noundef nonnull ptr @_Znam(i64 noundef) local_unnamed_addr #3

; Function Attrs: mustprogress nocallback nofree nosync nounwind willreturn memory(argmem: readwrite)
declare void @llvm.lifetime.end.p0(i64 immarg, ptr nocapture) #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 = { mustprogress nocallback nofree nosync nounwind willreturn memory(argmem: readwrite) }
attributes #2 = { 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 #3 = { nobuiltin allocsize(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 = { nounwind }
attributes #5 = { builtin allocsize(0) }

!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,IPSCCPPass,IndVarSimplifyPass,InferFunctionAttrsPass,InstCombinePass,JumpThreadingPass,LoopRotatePass,LoopSimplifyPass,LoopUnrollPass,ReassociatePass,SROAPass,SimplifyCFGPass