; LLVM IR from VastoLorde95/Competitive-Programming :: Codeforces/129 Division 1/Problem A/A.ll (Z5firstx)

; 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"

@pows = external dso_local global [20 x i64], align 16

; Function Attrs: mustprogress nounwind uwtable
declare dso_local noundef i32 @_Z3lenx(i64 noundef) #0

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

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

; Function Attrs: mustprogress nounwind uwtable
define dso_local noundef i64 @_Z5firstx(i64 noundef %0) #0 {
  %2 = alloca i64, align 8
  %3 = alloca i32, align 4
  %4 = alloca i32, align 4
  %5 = alloca i32, align 4
  store i64 %0, ptr %2, align 8, !tbaa !5
  call void @llvm.lifetime.start.p0(i64 4, ptr %3) #2
  %6 = load i64, ptr %2, align 8, !tbaa !5
  %7 = call noundef i32 @_Z3lenx(i64 noundef %6)
  store i32 %7, ptr %3, align 4, !tbaa !9
  call void @llvm.lifetime.start.p0(i64 4, ptr %4) #2
  %8 = load i64, ptr %2, align 8, !tbaa !5
  %9 = load i32, ptr %3, align 4, !tbaa !9
  %10 = sub nsw i32 %9, 1
  %11 = sext i32 %10 to i64
  %12 = getelementptr inbounds [20 x i64], ptr @pows, i64 0, i64 %11
  %13 = load i64, ptr %12, align 8, !tbaa !5
  %14 = sdiv i64 %8, %13
  %15 = trunc i64 %14 to i32
  store i32 %15, ptr %4, align 4, !tbaa !9
  call void @llvm.lifetime.start.p0(i64 4, ptr %5) #2
  %16 = load i64, ptr %2, align 8, !tbaa !5
  %17 = srem i64 %16, 10
  %18 = trunc i64 %17 to i32
  store i32 %18, ptr %5, align 4, !tbaa !9
  br label %19

19:                                               ; preds = %23, %1
  %20 = load i32, ptr %4, align 4, !tbaa !9
  %21 = load i32, ptr %5, align 4, !tbaa !9
  %22 = icmp ne i32 %20, %21
  br i1 %22, label %23, label %37

23:                                               ; preds = %19
  %24 = load i64, ptr %2, align 8, !tbaa !5
  %25 = add nsw i64 %24, 1
  store i64 %25, ptr %2, align 8, !tbaa !5
  %26 = load i64, ptr %2, align 8, !tbaa !5
  %27 = load i32, ptr %3, align 4, !tbaa !9
  %28 = sub nsw i32 %27, 1
  %29 = sext i32 %28 to i64
  %30 = getelementptr inbounds [20 x i64], ptr @pows, i64 0, i64 %29
  %31 = load i64, ptr %30, align 8, !tbaa !5
  %32 = sdiv i64 %26, %31
  %33 = trunc i64 %32 to i32
  store i32 %33, ptr %4, align 4, !tbaa !9
  %34 = load i64, ptr %2, align 8, !tbaa !5
  %35 = srem i64 %34, 10
  %36 = trunc i64 %35 to i32
  store i32 %36, ptr %5, align 4, !tbaa !9
  br label %19, !llvm.loop !11

37:                                               ; preds = %19
  %38 = load i64, ptr %2, align 8, !tbaa !5
  call void @llvm.lifetime.end.p0(i64 4, ptr %5) #2
  call void @llvm.lifetime.end.p0(i64 4, ptr %4) #2
  call void @llvm.lifetime.end.p0(i64 4, ptr %3) #2
  ret i64 %38
}

attributes #0 = { mustprogress 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 = { nocallback nofree nosync nounwind willreturn memory(argmem: readwrite) }
attributes #2 = { 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 = !{!"long long", !7, i64 0}
!7 = !{!"omnipotent char", !8, i64 0}
!8 = !{!"Simple C++ TBAA"}
!9 = !{!10, !10, i64 0}
!10 = !{!"int", !7, i64 0}
!11 = distinct !{!11, !12}
!12 = !{!"llvm.loop.mustprogress"}


; 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"

@pows = external dso_local local_unnamed_addr global [20 x i64], align 16

; Function Attrs: mustprogress nounwind uwtable
declare dso_local noundef i32 @_Z3lenx(i64 noundef) local_unnamed_addr #0

; Function Attrs: mustprogress nounwind uwtable
define dso_local noundef i64 @_Z5firstx(i64 noundef %0) local_unnamed_addr #0 {
  %2 = tail call noundef i32 @_Z3lenx(i64 noundef %0)
  %3 = add nsw i32 %2, -1
  %4 = sext i32 %3 to i64
  %5 = getelementptr inbounds [20 x i64], ptr @pows, i64 0, i64 %4
  %6 = load i64, ptr %5, align 8, !tbaa !5
  br label %7

7:                                                ; preds = %7, %1
  %.012 = phi i64 [ %0, %1 ], [ %8, %7 ]
  %.011.in = sdiv i64 %.012, %6
  %.0.in = srem i64 %.012, 10
  %.0 = trunc nsw i64 %.0.in to i32
  %.011 = trunc i64 %.011.in to i32
  %.not = icmp eq i32 %.011, %.0
  %8 = add nsw i64 %.012, 1
  br i1 %.not, label %9, label %7, !llvm.loop !9

9:                                                ; preds = %7
  ret i64 %.012
}

attributes #0 = { mustprogress 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" }

!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 = !{!"long long", !7, i64 0}
!7 = !{!"omnipotent char", !8, i64 0}
!8 = !{!"Simple C++ TBAA"}
!9 = distinct !{!9, !10}
!10 = !{!"llvm.loop.mustprogress"}


; Effective O3 passes: EarlyCSEPass,GVNPass,GlobalOptPass,IPSCCPPass,InferFunctionAttrsPass,InstCombinePass,InstSimplifyPass,LCSSAPass,LoopRotatePass,LoopUnrollPass,SROAPass,TailCallElimPass