; LLVM IR from tangjz/acm-icpc :: codeforces/complete/535B.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"

@tot = external dso_local global i32, align 4
@seq = external dso_local global [1024 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 = 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 %4 to i64
  %7 = getelementptr inbounds [1024 x i32], ptr @seq, i64 0, i64 %6
  store i32 %3, ptr %7, align 4, !tbaa !5
  %8 = load i32, ptr %2, align 4, !tbaa !5
  %9 = icmp sle i32 %8, 99999999
  br i1 %9, label %10, label %14

10:                                               ; preds = %1
  %11 = load i32, ptr %2, align 4, !tbaa !5
  %12 = mul nsw i32 %11, 10
  %13 = add nsw i32 %12, 4
  call void @_Z3dfsi(i32 noundef %13)
  br label %14

14:                                               ; preds = %10, %1
  %15 = load i32, ptr %2, align 4, !tbaa !5
  %16 = icmp sle i32 %15, 99999999
  br i1 %16, label %17, label %21

17:                                               ; preds = %14
  %18 = load i32, ptr %2, align 4, !tbaa !5
  %19 = mul nsw i32 %18, 10
  %20 = add nsw i32 %19, 7
  call void @_Z3dfsi(i32 noundef %20)
  br label %21

21:                                               ; preds = %17, %14
  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"

@tot = external dso_local local_unnamed_addr global i32, align 4
@seq = external dso_local local_unnamed_addr global [1024 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 = load i32, ptr @tot, align 4, !tbaa !5
  %3 = add nsw i32 %2, 1
  store i32 %3, ptr @tot, align 4, !tbaa !5
  %4 = sext i32 %2 to i64
  %5 = getelementptr inbounds [1024 x i32], ptr @seq, i64 0, i64 %4
  store i32 %0, ptr %5, align 4, !tbaa !5
  %6 = icmp slt i32 %0, 100000000
  br i1 %6, label %tailrecurse, label %.critedge

tailrecurse:                                      ; preds = %1, %tailrecurse
  %.tr5 = phi i32 [ %9, %tailrecurse ], [ %0, %1 ]
  %7 = mul nsw i32 %.tr5, 10
  %8 = add nsw i32 %7, 4
  tail call void @_Z3dfsi(i32 noundef %8)
  %9 = add nsw i32 %7, 7
  %10 = load i32, ptr @tot, align 4, !tbaa !5
  %11 = add nsw i32 %10, 1
  store i32 %11, ptr @tot, align 4, !tbaa !5
  %12 = sext i32 %10 to i64
  %13 = getelementptr inbounds [1024 x i32], ptr @seq, i64 0, i64 %12
  store i32 %9, ptr %13, align 4, !tbaa !5
  %14 = icmp slt i32 %.tr5, 10000000
  br i1 %14, label %tailrecurse, label %.critedge

.critedge:                                        ; preds = %tailrecurse, %1
  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: EarlyCSEPass,GlobalOptPass,InstCombinePass,JumpThreadingPass,LoopRotatePass,LoopSimplifyPass,LoopUnrollPass,PostOrderFunctionAttrsPass,SROAPass,SimplifyCFGPass,TailCallElimPass