; LLVM IR from tangjz/acm-icpc :: lydsy/1576.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"

@dep = external dso_local global [100001 x i32], align 16
@fa = external dso_local global [100001 x [17 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 = sext i32 %3 to i64
  %5 = getelementptr inbounds [100001 x [17 x i32]], ptr @fa, i64 0, i64 %4
  %6 = getelementptr inbounds [17 x i32], ptr %5, i64 0, i64 0
  %7 = load i32, ptr %6, align 4, !tbaa !5
  %8 = sext i32 %7 to i64
  %9 = getelementptr inbounds [100001 x i32], ptr @dep, i64 0, i64 %8
  %10 = load i32, ptr %9, align 4, !tbaa !5
  %11 = icmp ne i32 %10, 0
  br i1 %11, label %18, label %12

12:                                               ; preds = %1
  %13 = load i32, ptr %2, align 4, !tbaa !5
  %14 = sext i32 %13 to i64
  %15 = getelementptr inbounds [100001 x [17 x i32]], ptr @fa, i64 0, i64 %14
  %16 = getelementptr inbounds [17 x i32], ptr %15, i64 0, i64 0
  %17 = load i32, ptr %16, align 4, !tbaa !5
  call void @_Z3dfsi(i32 noundef %17)
  br label %18

18:                                               ; preds = %12, %1
  %19 = load i32, ptr %2, align 4, !tbaa !5
  %20 = sext i32 %19 to i64
  %21 = getelementptr inbounds [100001 x [17 x i32]], ptr @fa, i64 0, i64 %20
  %22 = getelementptr inbounds [17 x i32], ptr %21, i64 0, i64 0
  %23 = load i32, ptr %22, align 4, !tbaa !5
  %24 = sext i32 %23 to i64
  %25 = getelementptr inbounds [100001 x i32], ptr @dep, i64 0, i64 %24
  %26 = load i32, ptr %25, align 4, !tbaa !5
  %27 = add nsw i32 %26, 1
  %28 = load i32, ptr %2, align 4, !tbaa !5
  %29 = sext i32 %28 to i64
  %30 = getelementptr inbounds [100001 x i32], ptr @dep, i64 0, i64 %29
  store i32 %27, ptr %30, align 4, !tbaa !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"

@dep = external dso_local local_unnamed_addr global [100001 x i32], align 16
@fa = external dso_local local_unnamed_addr global [100001 x [17 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 = sext i32 %0 to i64
  %3 = getelementptr inbounds [100001 x [17 x i32]], ptr @fa, i64 0, i64 %2
  %4 = load i32, ptr %3, align 4, !tbaa !5
  %5 = sext i32 %4 to i64
  %6 = getelementptr inbounds [100001 x i32], ptr @dep, i64 0, i64 %5
  %7 = load i32, ptr %6, align 4, !tbaa !5
  %.not = icmp eq i32 %7, 0
  br i1 %.not, label %8, label %9

8:                                                ; preds = %1
  tail call void @_Z3dfsi(i32 noundef %4)
  %.pre = load i32, ptr %3, align 4, !tbaa !5
  %.phi.trans.insert = sext i32 %.pre to i64
  %.phi.trans.insert4 = getelementptr inbounds [100001 x i32], ptr @dep, i64 0, i64 %.phi.trans.insert
  %.pre5 = load i32, ptr %.phi.trans.insert4, align 4, !tbaa !5
  br label %9

9:                                                ; preds = %8, %1
  %10 = phi i32 [ %.pre5, %8 ], [ %7, %1 ]
  %11 = add nsw i32 %10, 1
  %12 = getelementptr inbounds [100001 x i32], ptr @dep, i64 0, i64 %2
  store i32 %11, ptr %12, align 4, !tbaa !5
  ret void
}

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: BDCEPass,EarlyCSEPass,GVNPass,GlobalOptPass,InstCombinePass,PostOrderFunctionAttrsPass,SROAPass,TailCallElimPass