; LLVM IR from freddiev4/dailyprogrammerchallenges :: Easy Challenges/Challenge 0239 Easy - A Game of Threes/solutions (solution)

; 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"

@.str = external hidden unnamed_addr constant [6 x i8], align 1
@.str.1 = external hidden unnamed_addr constant [7 x i8], align 1
@.str.2 = external hidden unnamed_addr constant [7 x i8], align 1
@.str.3 = external hidden unnamed_addr constant [3 x i8], align 1

; Function Attrs: nounwind uwtable
define dso_local i32 @main(i32 noundef %0, ptr noundef %1) #0 {
  %3 = alloca i32, align 4
  %4 = alloca i32, align 4
  %5 = alloca ptr, align 8
  %6 = alloca i32, align 4
  store i32 0, ptr %3, align 4
  store i32 %0, ptr %4, align 4, !tbaa !5
  store ptr %1, ptr %5, align 8, !tbaa !9
  call void @llvm.lifetime.start.p0(i64 4, ptr %6) #4
  %7 = load ptr, ptr %5, align 8, !tbaa !9
  %8 = getelementptr inbounds ptr, ptr %7, i64 1
  %9 = load ptr, ptr %8, align 8, !tbaa !9
  %10 = call i64 @strtol(ptr noundef %9, ptr noundef null, i32 noundef 10) #4
  %11 = trunc i64 %10 to i32
  store i32 %11, ptr %6, align 4, !tbaa !5
  br label %12

12:                                               ; preds = %29, %2
  %13 = load i32, ptr %6, align 4, !tbaa !5
  %14 = icmp ne i32 %13, 1
  br i1 %14, label %15, label %32

15:                                               ; preds = %12
  %16 = load i32, ptr %6, align 4, !tbaa !5
  %17 = srem i32 %16, 3
  switch i32 %17, label %29 [
    i32 0, label %18
    i32 1, label %21
    i32 2, label %25
  ]

18:                                               ; preds = %15
  %19 = load i32, ptr %6, align 4, !tbaa !5
  %20 = call i32 (ptr, ...) @printf(ptr noundef @.str, i32 noundef %19)
  br label %29

21:                                               ; preds = %15
  %22 = load i32, ptr %6, align 4, !tbaa !5
  %23 = add nsw i32 %22, -1
  store i32 %23, ptr %6, align 4, !tbaa !5
  %24 = call i32 (ptr, ...) @printf(ptr noundef @.str.1, i32 noundef %22)
  br label %29

25:                                               ; preds = %15
  %26 = load i32, ptr %6, align 4, !tbaa !5
  %27 = add nsw i32 %26, 1
  store i32 %27, ptr %6, align 4, !tbaa !5
  %28 = call i32 (ptr, ...) @printf(ptr noundef @.str.2, i32 noundef %26)
  br label %29

29:                                               ; preds = %25, %21, %18, %15
  %30 = load i32, ptr %6, align 4, !tbaa !5
  %31 = sdiv i32 %30, 3
  store i32 %31, ptr %6, align 4, !tbaa !5
  br label %12, !llvm.loop !11

32:                                               ; preds = %12
  %33 = load i32, ptr %6, align 4, !tbaa !5
  %34 = call i32 (ptr, ...) @printf(ptr noundef @.str.3, i32 noundef %33)
  call void @llvm.lifetime.end.p0(i64 4, ptr %6) #4
  %35 = load i32, ptr %3, align 4
  ret i32 %35
}

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

; Function Attrs: nounwind
declare i64 @strtol(ptr noundef, ptr noundef, i32 noundef) #2

declare i32 @printf(ptr noundef, ...) #3

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

attributes #0 = { 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 "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 #3 = { "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 #4 = { 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/C++ TBAA"}
!9 = !{!10, !10, i64 0}
!10 = !{!"any pointer", !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"

@.str = external hidden unnamed_addr constant [6 x i8], align 1
@.str.1 = external hidden unnamed_addr constant [7 x i8], align 1
@.str.2 = external hidden unnamed_addr constant [7 x i8], align 1
@.str.3 = external hidden unnamed_addr constant [3 x i8], align 1

; Function Attrs: nofree nounwind uwtable
define dso_local noundef i32 @main(i32 noundef %0, ptr nocapture noundef readonly %1) local_unnamed_addr #0 {
  %3 = getelementptr inbounds i8, ptr %1, i64 8
  %4 = load ptr, ptr %3, align 8, !tbaa !5
  %5 = tail call i64 @strtol(ptr nocapture noundef %4, ptr noundef null, i32 noundef 10) #3
  %6 = trunc i64 %5 to i32
  %.not8 = icmp eq i32 %6, 1
  br i1 %.not8, label %._crit_edge, label %.lr.ph

.lr.ph:                                           ; preds = %2, %13
  %.09 = phi i32 [ %14, %13 ], [ %6, %2 ]
  %7 = srem i32 %.09, 3
  switch i32 %7, label %13 [
    i32 0, label %.sink.split
    i32 1, label %8
    i32 2, label %10
  ]

8:                                                ; preds = %.lr.ph
  %9 = add nsw i32 %.09, -1
  br label %.sink.split

10:                                               ; preds = %.lr.ph
  %11 = add nsw i32 %.09, 1
  br label %.sink.split

.sink.split:                                      ; preds = %.lr.ph, %8, %10
  %.str.2.sink = phi ptr [ @.str.2, %10 ], [ @.str.1, %8 ], [ @.str, %.lr.ph ]
  %.1.ph = phi i32 [ %11, %10 ], [ %9, %8 ], [ %.09, %.lr.ph ]
  %12 = tail call i32 (ptr, ...) @printf(ptr noundef nonnull dereferenceable(1) %.str.2.sink, i32 noundef %.09)
  br label %13

13:                                               ; preds = %.sink.split, %.lr.ph
  %.1 = phi i32 [ %.09, %.lr.ph ], [ %.1.ph, %.sink.split ]
  %14 = sdiv i32 %.1, 3
  %.1.off = add i32 %.1, -3
  %.not = icmp ult i32 %.1.off, 3
  br i1 %.not, label %._crit_edge, label %.lr.ph, !llvm.loop !9

._crit_edge:                                      ; preds = %13, %2
  %15 = tail call i32 (ptr, ...) @printf(ptr noundef nonnull dereferenceable(1) @.str.3, i32 noundef 1)
  ret i32 0
}

; Function Attrs: mustprogress nofree nounwind willreturn
declare i64 @strtol(ptr noundef readonly, ptr nocapture noundef, i32 noundef) local_unnamed_addr #1

; Function Attrs: nofree nounwind
declare noundef i32 @printf(ptr nocapture noundef readonly, ...) local_unnamed_addr #2

attributes #0 = { nofree 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 = { mustprogress nofree nounwind willreturn "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 #2 = { nofree nounwind "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 #3 = { 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 = !{!"any pointer", !7, i64 0}
!7 = !{!"omnipotent char", !8, i64 0}
!8 = !{!"Simple C/C++ TBAA"}
!9 = distinct !{!9, !10}
!10 = !{!"llvm.loop.mustprogress"}


; Effective O3 passes: GlobalOptPass,IPSCCPPass,InferFunctionAttrsPass,InstCombinePass,JumpThreadingPass,LoopRotatePass,LoopSimplifyPass,LoopUnrollPass,PostOrderFunctionAttrsPass,SROAPass,SimplifyCFGPass,TailCallElimPass