; LLVM IR from tangjz/acm-icpc :: codeforces/complete/797D.ll (Z3dfsi)

; 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"

@cL = external dso_local global [100001 x i32], align 16
@cR = external dso_local global [100001 x i32], align 16
@tot = external dso_local global i32, align 4
@in = external dso_local global [100001 x i32], align 16
@out = external dso_local global [100001 x i32], align 16

; Function Attrs: mustprogress uwtable
define dso_local void @_Z3dfsi(i32 noundef %0) #0 {
  %2 = alloca i32, align 4
  store i32 %0, ptr %2, align 4, !tbaa !5
  %3 = load i32, ptr %2, align 4, !tbaa !5
  %4 = icmp eq i32 %3, -1
  br i1 %4, label %5, label %6

5:                                                ; preds = %1
  br label %24

6:                                                ; preds = %1
  %7 = load i32, ptr @tot, align 4, !tbaa !5
  %8 = add nsw i32 %7, 1
  store i32 %8, ptr @tot, align 4, !tbaa !5
  %9 = load i32, ptr %2, align 4, !tbaa !5
  %10 = sext i32 %9 to i64
  %11 = getelementptr inbounds [100001 x i32], ptr @in, i64 0, i64 %10
  store i32 %8, ptr %11, align 4, !tbaa !5
  %12 = load i32, ptr %2, align 4, !tbaa !5
  %13 = sext i32 %12 to i64
  %14 = getelementptr inbounds [100001 x i32], ptr @cL, i64 0, i64 %13
  %15 = load i32, ptr %14, align 4, !tbaa !5
  call void @_Z3dfsi(i32 noundef %15)
  %16 = load i32, ptr %2, align 4, !tbaa !5
  %17 = sext i32 %16 to i64
  %18 = getelementptr inbounds [100001 x i32], ptr @cR, i64 0, i64 %17
  %19 = load i32, ptr %18, align 4, !tbaa !5
  call void @_Z3dfsi(i32 noundef %19)
  %20 = load i32, ptr @tot, align 4, !tbaa !5
  %21 = load i32, ptr %2, align 4, !tbaa !5
  %22 = sext i32 %21 to i64
  %23 = getelementptr inbounds [100001 x i32], ptr @out, i64 0, i64 %22
  store i32 %20, ptr %23, align 4, !tbaa !5
  br label %24

24:                                               ; preds = %6, %5
  ret void
}

attributes #0 = { 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" }

!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"}


; 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"

@cL = external dso_local local_unnamed_addr global [100001 x i32], align 16
@cR = external dso_local local_unnamed_addr global [100001 x i32], align 16
@tot = external dso_local local_unnamed_addr global i32, align 4
@in = external dso_local local_unnamed_addr global [100001 x i32], align 16
@out = external dso_local local_unnamed_addr global [100001 x i32], align 16

; Function Attrs: mustprogress nofree nosync nounwind memory(readwrite, argmem: none, inaccessiblemem: none) uwtable
define dso_local void @_Z3dfsi(i32 noundef %0) local_unnamed_addr #0 {
  %2 = icmp eq i32 %0, -1
  br i1 %2, label %common.ret5, label %3

common.ret5:                                      ; preds = %1, %3
  ret void

3:                                                ; preds = %1
  %4 = load i32, ptr @tot, align 4, !tbaa !5
  %5 = add nsw i32 %4, 1
  store i32 %5, ptr @tot, align 4, !tbaa !5
  %6 = sext i32 %0 to i64
  %7 = getelementptr inbounds [100001 x i32], ptr @in, i64 0, i64 %6
  store i32 %5, ptr %7, align 4, !tbaa !5
  %8 = getelementptr inbounds [100001 x i32], ptr @cL, i64 0, i64 %6
  %9 = load i32, ptr %8, align 4, !tbaa !5
  tail call void @_Z3dfsi(i32 noundef %9)
  %10 = getelementptr inbounds [100001 x i32], ptr @cR, i64 0, i64 %6
  %11 = load i32, ptr %10, align 4, !tbaa !5
  tail call void @_Z3dfsi(i32 noundef %11)
  %12 = load i32, ptr @tot, align 4, !tbaa !5
  %13 = getelementptr inbounds [100001 x i32], ptr @out, i64 0, i64 %6
  store i32 %12, ptr %13, align 4, !tbaa !5
  br label %common.ret5
}

attributes #0 = { mustprogress nofree nosync nounwind memory(readwrite, argmem: none, inaccessiblemem: none) 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" }

!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"}


; Effective O3 passes: EarlyCSEPass,GlobalOptPass,PostOrderFunctionAttrsPass,SROAPass,SimplifyCFGPass,TailCallElimPass