; LLVM IR from VastoLorde95/Competitive-Programming :: Hackerrank/Company Contests/CodeStorm/Problem B (B)

; 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
@b = external dso_local global [1000 x i32], align 16
@.str = external hidden unnamed_addr constant [3 x i8], align 1
@.str.1 = 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
  store i32 0, ptr %1, align 4
  %5 = call i32 (ptr, ...) @__isoc99_scanf(ptr noundef @.str, ptr noundef @t)
  br label %6

6:                                                ; preds = %54, %0
  %7 = load i32, ptr @t, align 4, !tbaa !5
  %8 = add nsw i32 %7, -1
  store i32 %8, ptr @t, align 4, !tbaa !5
  %9 = icmp ne i32 %7, 0
  br i1 %9, label %10, label %57

10:                                               ; preds = %6
  %11 = call i32 (ptr, ...) @__isoc99_scanf(ptr noundef @.str, ptr noundef @n)
  call void @llvm.lifetime.start.p0(i64 4, ptr %2) #3
  store i32 0, ptr %2, align 4, !tbaa !5
  br label %12

12:                                               ; preds = %22, %10
  %13 = load i32, ptr %2, align 4, !tbaa !5
  %14 = load i32, ptr @n, align 4, !tbaa !5
  %15 = icmp slt i32 %13, %14
  br i1 %15, label %17, label %16

16:                                               ; preds = %12
  call void @llvm.lifetime.end.p0(i64 4, ptr %2) #3
  br label %25

17:                                               ; preds = %12
  %18 = load i32, ptr %2, align 4, !tbaa !5
  %19 = sext i32 %18 to i64
  %20 = getelementptr inbounds [1000 x i32], ptr @b, i64 0, i64 %19
  %21 = call i32 (ptr, ...) @__isoc99_scanf(ptr noundef @.str, ptr noundef %20)
  br label %22

22:                                               ; preds = %17
  %23 = load i32, ptr %2, align 4, !tbaa !5
  %24 = add nsw i32 %23, 1
  store i32 %24, ptr %2, align 4, !tbaa !5
  br label %12, !llvm.loop !9

25:                                               ; preds = %16
  call void @llvm.lifetime.start.p0(i64 4, ptr %3) #3
  store i32 0, ptr %3, align 4, !tbaa !5
  call void @llvm.lifetime.start.p0(i64 4, ptr %4) #3
  store i32 1, ptr %4, align 4, !tbaa !5
  br label %26

26:                                               ; preds = %51, %25
  %27 = load i32, ptr %4, align 4, !tbaa !5
  %28 = load i32, ptr @n, align 4, !tbaa !5
  %29 = icmp slt i32 %27, %28
  br i1 %29, label %31, label %30

30:                                               ; preds = %26
  call void @llvm.lifetime.end.p0(i64 4, ptr %4) #3
  br label %54

31:                                               ; preds = %26
  %32 = load i32, ptr %4, align 4, !tbaa !5
  %33 = sub nsw i32 %32, 1
  %34 = sext i32 %33 to i64
  %35 = getelementptr inbounds [1000 x i32], ptr @b, i64 0, i64 %34
  %36 = load i32, ptr %35, align 4, !tbaa !5
  %37 = icmp eq i32 %36, 0
  br i1 %37, label %38, label %50

38:                                               ; preds = %31
  %39 = load i32, ptr %4, align 4, !tbaa !5
  %40 = sext i32 %39 to i64
  %41 = getelementptr inbounds [1000 x i32], ptr @b, i64 0, i64 %40
  %42 = load i32, ptr %41, align 4, !tbaa !5
  %43 = icmp eq i32 %42, 0
  br i1 %43, label %44, label %50

44:                                               ; preds = %38
  %45 = load i32, ptr %4, align 4, !tbaa !5
  %46 = sext i32 %45 to i64
  %47 = getelementptr inbounds [1000 x i32], ptr @b, i64 0, i64 %46
  store i32 1, ptr %47, align 4, !tbaa !5
  %48 = load i32, ptr %3, align 4, !tbaa !5
  %49 = add nsw i32 %48, 1
  store i32 %49, ptr %3, align 4, !tbaa !5
  br label %50

50:                                               ; preds = %44, %38, %31
  br label %51

51:                                               ; preds = %50
  %52 = load i32, ptr %4, align 4, !tbaa !5
  %53 = add nsw i32 %52, 1
  store i32 %53, ptr %4, align 4, !tbaa !5
  br label %26, !llvm.loop !11

54:                                               ; preds = %30
  %55 = load i32, ptr %3, align 4, !tbaa !5
  %56 = call i32 (ptr, ...) @printf(ptr noundef @.str.1, i32 noundef %55)
  call void @llvm.lifetime.end.p0(i64 4, ptr %3) #3
  br label %6, !llvm.loop !12

57:                                               ; preds = %6
  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

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 = { 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 = distinct !{!12, !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"

@t = external dso_local global i32, align 4
@n = external dso_local global i32, align 4
@b = external dso_local global [1000 x i32], align 16
@.str = external hidden unnamed_addr constant [3 x i8], align 1
@.str.1 = external hidden unnamed_addr constant [4 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
  %.not17 = icmp eq i32 %2, 0
  br i1 %.not17, label %._crit_edge20, label %.lr.ph19

.lr.ph19:                                         ; preds = %0, %._crit_edge
  %4 = tail call i32 (ptr, ...) @__isoc99_scanf(ptr noundef nonnull @.str, ptr noundef nonnull @n)
  %5 = load i32, ptr @n, align 4, !tbaa !5
  %6 = icmp sgt i32 %5, 0
  br i1 %6, label %.lr.ph, label %._crit_edge

.preheader:                                       ; preds = %.lr.ph
  %7 = icmp sgt i32 %12, 1
  br i1 %7, label %.lr.ph15.preheader, label %._crit_edge

.lr.ph15.preheader:                               ; preds = %.preheader
  %wide.trip.count = zext nneg i32 %12 to i64
  %8 = add nsw i64 %wide.trip.count, -1
  %xtraiter = and i64 %8, 1
  %9 = icmp eq i32 %12, 2
  br i1 %9, label %._crit_edge.loopexit.unr-lcssa, label %.lr.ph15.preheader.new

.lr.ph15.preheader.new:                           ; preds = %.lr.ph15.preheader
  %unroll_iter = and i64 %8, -2
  br label %.lr.ph15

.lr.ph:                                           ; preds = %.lr.ph19, %.lr.ph
  %indvars.iv = phi i64 [ %indvars.iv.next, %.lr.ph ], [ 0, %.lr.ph19 ]
  %10 = getelementptr inbounds [1000 x i32], ptr @b, i64 0, i64 %indvars.iv
  %11 = tail call i32 (ptr, ...) @__isoc99_scanf(ptr noundef nonnull @.str, ptr noundef nonnull %10)
  %indvars.iv.next = add nuw nsw i64 %indvars.iv, 1
  %12 = load i32, ptr @n, align 4, !tbaa !5
  %13 = sext i32 %12 to i64
  %14 = icmp slt i64 %indvars.iv.next, %13
  br i1 %14, label %.lr.ph, label %.preheader, !llvm.loop !9

._crit_edge.loopexit.unr-lcssa:                   ; preds = %47, %.lr.ph15.preheader
  %.1.lcssa.ph = phi i32 [ poison, %.lr.ph15.preheader ], [ %.1.1, %47 ]
  %indvars.iv23.unr = phi i64 [ 1, %.lr.ph15.preheader ], [ %indvars.iv.next24.1, %47 ]
  %.01013.unr = phi i32 [ 0, %.lr.ph15.preheader ], [ %.1.1, %47 ]
  %lcmp.mod.not = icmp eq i64 %xtraiter, 0
  br i1 %lcmp.mod.not, label %._crit_edge, label %.lr.ph15.epil

.lr.ph15.epil:                                    ; preds = %._crit_edge.loopexit.unr-lcssa
  %15 = add nsw i64 %indvars.iv23.unr, -1
  %16 = getelementptr inbounds [1000 x i32], ptr @b, i64 0, i64 %15
  %17 = load i32, ptr %16, align 4, !tbaa !5
  %18 = icmp eq i32 %17, 0
  br i1 %18, label %19, label %._crit_edge

19:                                               ; preds = %.lr.ph15.epil
  %20 = getelementptr inbounds [1000 x i32], ptr @b, i64 0, i64 %indvars.iv23.unr
  %21 = load i32, ptr %20, align 4, !tbaa !5
  %22 = icmp eq i32 %21, 0
  br i1 %22, label %23, label %._crit_edge

23:                                               ; preds = %19
  store i32 1, ptr %20, align 4, !tbaa !5
  %24 = add nsw i32 %.01013.unr, 1
  br label %._crit_edge

._crit_edge:                                      ; preds = %._crit_edge.loopexit.unr-lcssa, %23, %19, %.lr.ph15.epil, %.lr.ph19, %.preheader
  %.010.lcssa = phi i32 [ 0, %.preheader ], [ 0, %.lr.ph19 ], [ %.1.lcssa.ph, %._crit_edge.loopexit.unr-lcssa ], [ %24, %23 ], [ %.01013.unr, %19 ], [ %.01013.unr, %.lr.ph15.epil ]
  %25 = tail call i32 (ptr, ...) @printf(ptr noundef nonnull dereferenceable(1) @.str.1, i32 noundef %.010.lcssa)
  %26 = load i32, ptr @t, align 4, !tbaa !5
  %27 = add nsw i32 %26, -1
  store i32 %27, ptr @t, align 4, !tbaa !5
  %.not = icmp eq i32 %26, 0
  br i1 %.not, label %._crit_edge20, label %.lr.ph19, !llvm.loop !11

.lr.ph15:                                         ; preds = %47, %.lr.ph15.preheader.new
  %indvars.iv23 = phi i64 [ 1, %.lr.ph15.preheader.new ], [ %indvars.iv.next24.1, %47 ]
  %.01013 = phi i32 [ 0, %.lr.ph15.preheader.new ], [ %.1.1, %47 ]
  %niter = phi i64 [ 0, %.lr.ph15.preheader.new ], [ %niter.next.1, %47 ]
  %28 = add nsw i64 %indvars.iv23, -1
  %29 = getelementptr inbounds [1000 x i32], ptr @b, i64 0, i64 %28
  %30 = load i32, ptr %29, align 4, !tbaa !5
  %31 = icmp eq i32 %30, 0
  br i1 %31, label %32, label %.lr.ph15.1

32:                                               ; preds = %.lr.ph15
  %33 = getelementptr inbounds [1000 x i32], ptr @b, i64 0, i64 %indvars.iv23
  %34 = load i32, ptr %33, align 4, !tbaa !5
  %35 = icmp eq i32 %34, 0
  br i1 %35, label %36, label %.lr.ph15.1

36:                                               ; preds = %32
  store i32 1, ptr %33, align 4, !tbaa !5
  %37 = add nsw i32 %.01013, 1
  br label %.lr.ph15.1

.lr.ph15.1:                                       ; preds = %.lr.ph15, %32, %36
  %.1 = phi i32 [ %37, %36 ], [ %.01013, %32 ], [ %.01013, %.lr.ph15 ]
  %38 = getelementptr inbounds [1000 x i32], ptr @b, i64 0, i64 %indvars.iv23
  %39 = load i32, ptr %38, align 4, !tbaa !5
  %40 = icmp eq i32 %39, 0
  br i1 %40, label %41, label %47

41:                                               ; preds = %.lr.ph15.1
  %indvars.iv.next24 = add nuw nsw i64 %indvars.iv23, 1
  %42 = getelementptr inbounds [1000 x i32], ptr @b, i64 0, i64 %indvars.iv.next24
  %43 = load i32, ptr %42, align 4, !tbaa !5
  %44 = icmp eq i32 %43, 0
  br i1 %44, label %45, label %47

45:                                               ; preds = %41
  store i32 1, ptr %42, align 4, !tbaa !5
  %46 = add nsw i32 %.1, 1
  br label %47

47:                                               ; preds = %45, %41, %.lr.ph15.1
  %.1.1 = phi i32 [ %46, %45 ], [ %.1, %41 ], [ %.1, %.lr.ph15.1 ]
  %indvars.iv.next24.1 = add nuw nsw i64 %indvars.iv23, 2
  %niter.next.1 = add i64 %niter, 2
  %niter.ncmp.1 = icmp eq i64 %niter.next.1, %unroll_iter
  br i1 %niter.ncmp.1, label %._crit_edge.loopexit.unr-lcssa, label %.lr.ph15, !llvm.loop !12

._crit_edge20:                                    ; preds = %._crit_edge, %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 @printf(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"}
!11 = distinct !{!11, !10}
!12 = distinct !{!12, !10}


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