; LLVM IR from lzyrapx/Competitive-Programming :: HDUOJ (1128)

; 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"

@a = external dso_local global [1000001 x i32], align 16
@.str = 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
  call void @llvm.lifetime.start.p0(i64 4, ptr %2) #3
  call void @llvm.lifetime.start.p0(i64 4, ptr %3) #3
  call void @llvm.lifetime.start.p0(i64 4, ptr %4) #3
  store i32 0, ptr %4, align 4, !tbaa !5
  store i32 1, ptr %2, align 4, !tbaa !5
  br label %5

5:                                                ; preds = %35, %0
  %6 = load i32, ptr %2, align 4, !tbaa !5
  %7 = icmp sle i32 %6, 1000000
  br i1 %7, label %8, label %38

8:                                                ; preds = %5
  %9 = load i32, ptr %2, align 4, !tbaa !5
  store i32 %9, ptr %3, align 4, !tbaa !5
  %10 = load i32, ptr %3, align 4, !tbaa !5
  store i32 %10, ptr %4, align 4, !tbaa !5
  br label %11

11:                                               ; preds = %19, %8
  %12 = load i32, ptr %3, align 4, !tbaa !5
  %13 = icmp ne i32 %12, 0
  br i1 %13, label %14, label %22

14:                                               ; preds = %11
  %15 = load i32, ptr %3, align 4, !tbaa !5
  %16 = srem i32 %15, 10
  %17 = load i32, ptr %4, align 4, !tbaa !5
  %18 = add nsw i32 %17, %16
  store i32 %18, ptr %4, align 4, !tbaa !5
  br label %19

19:                                               ; preds = %14
  %20 = load i32, ptr %3, align 4, !tbaa !5
  %21 = sdiv i32 %20, 10
  store i32 %21, ptr %3, align 4, !tbaa !5
  br label %11, !llvm.loop !9

22:                                               ; preds = %11
  %23 = load i32, ptr %4, align 4, !tbaa !5
  %24 = sext i32 %23 to i64
  %25 = getelementptr inbounds [1000001 x i32], ptr @a, i64 0, i64 %24
  store i32 1, ptr %25, align 4, !tbaa !5
  %26 = load i32, ptr %2, align 4, !tbaa !5
  %27 = sext i32 %26 to i64
  %28 = getelementptr inbounds [1000001 x i32], ptr @a, i64 0, i64 %27
  %29 = load i32, ptr %28, align 4, !tbaa !5
  %30 = icmp ne i32 %29, 0
  br i1 %30, label %34, label %31

31:                                               ; preds = %22
  %32 = load i32, ptr %2, align 4, !tbaa !5
  %33 = call i32 (ptr, ...) @printf(ptr noundef @.str, i32 noundef %32)
  br label %34

34:                                               ; preds = %31, %22
  br label %35

35:                                               ; preds = %34
  %36 = load i32, ptr %2, align 4, !tbaa !5
  %37 = add nsw i32 %36, 1
  store i32 %37, ptr %2, align 4, !tbaa !5
  br label %5, !llvm.loop !11

38:                                               ; preds = %5
  call void @llvm.lifetime.end.p0(i64 4, ptr %4) #3
  call void @llvm.lifetime.end.p0(i64 4, ptr %3) #3
  call void @llvm.lifetime.end.p0(i64 4, ptr %2) #3
  ret i32 0
}

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

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

; 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 = { 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}


; 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"

@a = external dso_local local_unnamed_addr global [1000001 x i32], align 16
@.str = 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 {
  br label %.preheader

.preheader:                                       ; preds = %0, %13
  %indvars.iv = phi i64 [ 1, %0 ], [ %indvars.iv.next, %13 ]
  %1 = trunc nuw nsw i64 %indvars.iv to i32
  br label %2

2:                                                ; preds = %.preheader, %2
  %.015 = phi i32 [ %1, %.preheader ], [ %4, %2 ]
  %.01114 = phi i32 [ %1, %.preheader ], [ %5, %2 ]
  %3 = srem i32 %.01114, 10
  %4 = add nsw i32 %.015, %3
  %5 = sdiv i32 %.01114, 10
  %.01114.off = add nsw i32 %.01114, 9
  %.not = icmp ult i32 %.01114.off, 19
  br i1 %.not, label %6, label %2, !llvm.loop !5

6:                                                ; preds = %2
  %7 = sext i32 %4 to i64
  %8 = getelementptr inbounds [1000001 x i32], ptr @a, i64 0, i64 %7
  store i32 1, ptr %8, align 4, !tbaa !7
  %9 = getelementptr inbounds [1000001 x i32], ptr @a, i64 0, i64 %indvars.iv
  %10 = load i32, ptr %9, align 4, !tbaa !7
  %.not13 = icmp eq i32 %10, 0
  br i1 %.not13, label %11, label %13

11:                                               ; preds = %6
  %12 = tail call i32 (ptr, ...) @printf(ptr noundef nonnull dereferenceable(1) @.str, i32 noundef %1)
  br label %13

13:                                               ; preds = %6, %11
  %indvars.iv.next = add nuw nsw i64 %indvars.iv, 1
  %exitcond.not = icmp eq i64 %indvars.iv.next, 1000001
  br i1 %exitcond.not, label %14, label %.preheader, !llvm.loop !11

14:                                               ; preds = %13
  ret i32 0
}

; 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 = distinct !{!5, !6}
!6 = !{!"llvm.loop.mustprogress"}
!7 = !{!8, !8, i64 0}
!8 = !{!"int", !9, i64 0}
!9 = !{!"omnipotent char", !10, i64 0}
!10 = !{!"Simple C++ TBAA"}
!11 = distinct !{!11, !6}


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