; LLVM IR from plskz/competitive-programming :: Codeforces/Codeforces Round #651 (Div. 2)/C.ll (Z3wini)

; 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 zeroext i1 @_Z3wini(i32 noundef %0) #0 {
  %2 = alloca i1, align 1
  %3 = alloca i32, align 4
  %4 = alloca i32, align 4
  %5 = alloca i32, align 4
  store i32 %0, ptr %3, align 4, !tbaa !5
  %6 = load i32, ptr %3, align 4, !tbaa !5
  %7 = icmp eq i32 %6, 1
  br i1 %7, label %8, label %9

8:                                                ; preds = %1
  store i1 false, ptr %2, align 1
  br label %48

9:                                                ; preds = %1
  %10 = load i32, ptr %3, align 4, !tbaa !5
  %11 = icmp eq i32 %10, 2
  br i1 %11, label %12, label %13

12:                                               ; preds = %9
  store i1 true, ptr %2, align 1
  br label %48

13:                                               ; preds = %9
  %14 = load i32, ptr %3, align 4, !tbaa !5
  %15 = load i32, ptr %3, align 4, !tbaa !5
  %16 = sub nsw i32 %15, 1
  %17 = and i32 %14, %16
  %18 = icmp eq i32 %17, 0
  br i1 %18, label %19, label %20

19:                                               ; preds = %13
  store i1 false, ptr %2, align 1
  br label %48

20:                                               ; preds = %13
  %21 = load i32, ptr %3, align 4, !tbaa !5
  %22 = srem i32 %21, 4
  %23 = icmp eq i32 %22, 2
  br i1 %23, label %24, label %47

24:                                               ; preds = %20
  %25 = load i32, ptr %3, align 4, !tbaa !5
  %26 = sdiv i32 %25, 2
  store i32 %26, ptr %3, align 4, !tbaa !5
  call void @llvm.lifetime.start.p0(i64 4, ptr %4) #2
  store i32 3, ptr %4, align 4, !tbaa !5
  br label %27

27:                                               ; preds = %41, %24
  %28 = load i32, ptr %4, align 4, !tbaa !5
  %29 = load i32, ptr %4, align 4, !tbaa !5
  %30 = mul nsw i32 %28, %29
  %31 = load i32, ptr %3, align 4, !tbaa !5
  %32 = icmp sle i32 %30, %31
  br i1 %32, label %34, label %33

33:                                               ; preds = %27
  store i32 2, ptr %5, align 4
  br label %44

34:                                               ; preds = %27
  %35 = load i32, ptr %3, align 4, !tbaa !5
  %36 = load i32, ptr %4, align 4, !tbaa !5
  %37 = srem i32 %35, %36
  %38 = icmp eq i32 %37, 0
  br i1 %38, label %39, label %40

39:                                               ; preds = %34
  store i1 true, ptr %2, align 1
  store i32 1, ptr %5, align 4
  br label %44

40:                                               ; preds = %34
  br label %41

41:                                               ; preds = %40
  %42 = load i32, ptr %4, align 4, !tbaa !5
  %43 = add nsw i32 %42, 1
  store i32 %43, ptr %4, align 4, !tbaa !5
  br label %27, !llvm.loop !9

44:                                               ; preds = %39, %33
  call void @llvm.lifetime.end.p0(i64 4, ptr %4) #2
  %45 = load i32, ptr %5, align 4
  switch i32 %45, label %50 [
    i32 2, label %46
    i32 1, label %48
  ]

46:                                               ; preds = %44
  store i1 false, ptr %2, align 1
  br label %48

47:                                               ; preds = %20
  store i1 true, ptr %2, align 1
  br label %48

48:                                               ; preds = %47, %46, %44, %19, %12, %8
  %49 = load i1, ptr %2, align 1
  ret i1 %49

50:                                               ; preds = %44
  unreachable
}

; 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

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 = !{!"int", !7, i64 0}
!7 = !{!"omnipotent char", !8, i64 0}
!8 = !{!"Simple C++ TBAA"}
!9 = distinct !{!9, !10}
!10 = !{!"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"

; Function Attrs: mustprogress nofree norecurse nosync nounwind willreturn memory(none) uwtable
define dso_local noundef zeroext i1 @_Z3wini(i32 noundef %0) local_unnamed_addr #0 {
  switch i32 %0, label %3 [
    i32 1, label %.loopexit
    i32 2, label %2
  ]

2:                                                ; preds = %1
  br label %.loopexit

3:                                                ; preds = %1
  %4 = tail call range(i32 0, 33) i32 @llvm.ctpop.i32(i32 %0)
  %5 = icmp ult i32 %4, 2
  br i1 %5, label %.loopexit, label %6

6:                                                ; preds = %3
  %7 = and i32 %0, -2147483645
  %8 = icmp eq i32 %7, 2
  br i1 %8, label %9, label %.loopexit

9:                                                ; preds = %6
  %10 = lshr exact i32 %0, 1
  %.not17 = icmp ugt i32 %0, 16
  br i1 %.not17, label %.lr.ph, label %.loopexit

11:                                               ; preds = %.lr.ph
  %12 = add nuw nsw i32 %.01318, 1
  %13 = mul nuw nsw i32 %12, %12
  %.not.not = icmp ugt i32 %13, %10
  br i1 %.not.not, label %.loopexit, label %.lr.ph, !llvm.loop !5

.lr.ph:                                           ; preds = %9, %11
  %.01318 = phi i32 [ %12, %11 ], [ 3, %9 ]
  %14 = urem i32 %10, %.01318
  %15 = icmp eq i32 %14, 0
  br i1 %15, label %.loopexit, label %11

.loopexit:                                        ; preds = %.lr.ph, %11, %9, %6, %3, %1, %2
  %.1 = phi i1 [ true, %2 ], [ false, %1 ], [ false, %3 ], [ true, %6 ], [ false, %9 ], [ %15, %11 ], [ %15, %.lr.ph ]
  ret i1 %.1
}

; Function Attrs: nocallback nofree nosync nounwind speculatable willreturn memory(none)
declare i32 @llvm.ctpop.i32(i32) #1

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" }
attributes #1 = { nocallback nofree nosync nounwind speculatable willreturn memory(none) }

!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"}


; Effective O3 passes: ConstraintEliminationPass,CorrelatedValuePropagationPass,GVNPass,GlobalOptPass,IPSCCPPass,InferFunctionAttrsPass,InstCombinePass,InstSimplifyPass,JumpThreadingPass,LCSSAPass,LoopRotatePass,LoopSimplifyPass,LoopUnrollPass,PostOrderFunctionAttrsPass,SROAPass,SimplifyCFGPass,TailCallElimPass