; LLVM IR from duc0/ContestNeko :: tasks/CodeForces/R318/TaskA.ll (Z9mapNumberi)

; 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"

; Function Attrs: mustprogress nounwind uwtable
define dso_local noundef i32 @_Z9mapNumberi(i32 noundef %0) #0 {
  %2 = alloca i32, align 4
  store i32 %0, ptr %2, align 4, !tbaa !5
  br label %3

3:                                                ; preds = %7, %1
  %4 = load i32, ptr %2, align 4, !tbaa !5
  %5 = srem i32 %4, 2
  %6 = icmp eq i32 %5, 0
  br i1 %6, label %7, label %10

7:                                                ; preds = %3
  %8 = load i32, ptr %2, align 4, !tbaa !5
  %9 = sdiv i32 %8, 2
  store i32 %9, ptr %2, align 4, !tbaa !5
  br label %3, !llvm.loop !9

10:                                               ; preds = %3
  br label %11

11:                                               ; preds = %15, %10
  %12 = load i32, ptr %2, align 4, !tbaa !5
  %13 = srem i32 %12, 3
  %14 = icmp eq i32 %13, 0
  br i1 %14, label %15, label %18

15:                                               ; preds = %11
  %16 = load i32, ptr %2, align 4, !tbaa !5
  %17 = sdiv i32 %16, 3
  store i32 %17, ptr %2, align 4, !tbaa !5
  br label %11, !llvm.loop !11

18:                                               ; preds = %11
  %19 = load i32, ptr %2, align 4, !tbaa !5
  ret i32 %19
}

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 = !{!"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"

; Function Attrs: mustprogress nofree norecurse nosync nounwind willreturn memory(none) uwtable
define dso_local noundef i32 @_Z9mapNumberi(i32 noundef %0) local_unnamed_addr #0 {
  br label %2

2:                                                ; preds = %2, %1
  %.0 = phi i32 [ %0, %1 ], [ %5, %2 ]
  %3 = and i32 %.0, 1
  %4 = icmp eq i32 %3, 0
  %5 = ashr exact i32 %.0, 1
  br i1 %4, label %2, label %.preheader, !llvm.loop !5

.preheader:                                       ; preds = %2
  %6 = srem i32 %.0, 3
  %7 = icmp eq i32 %6, 0
  br i1 %7, label %.lr.ph, label %._crit_edge

.lr.ph:                                           ; preds = %.preheader, %.lr.ph
  %.15 = phi i32 [ %8, %.lr.ph ], [ %.0, %.preheader ]
  %8 = sdiv i32 %.15, 3
  %9 = srem i32 %8, 3
  %10 = icmp eq i32 %9, 0
  br i1 %10, label %.lr.ph, label %._crit_edge, !llvm.loop !7

._crit_edge:                                      ; preds = %.lr.ph, %.preheader
  %.1.lcssa = phi i32 [ %.0, %.preheader ], [ %8, %.lr.ph ]
  ret i32 %.1.lcssa
}

attributes #0 = { mustprogress nofree norecurse nosync nounwind willreturn memory(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 = distinct !{!5, !6}
!6 = !{!"llvm.loop.mustprogress"}
!7 = distinct !{!7, !6}


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