; LLVM IR from Izaron/ACM-ICPC :: Timus Online Judge/Volume 11/2010. Sasha the Young Grandmaster.ll (Z9checkKingxx)

; 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"

@n = external dso_local global i64, align 8

; Function Attrs: nocallback nofree nosync nounwind willreturn memory(argmem: readwrite)
declare void @llvm.lifetime.start.p0(i64 immarg, ptr nocapture) #0

; Function Attrs: nocallback nofree nosync nounwind willreturn memory(argmem: readwrite)
declare void @llvm.lifetime.end.p0(i64 immarg, ptr nocapture) #0

; Function Attrs: mustprogress nounwind uwtable
define dso_local noundef i64 @_Z9checkKingxx(i64 noundef %0, i64 noundef %1) #1 {
  %3 = alloca i64, align 8
  %4 = alloca i64, align 8
  %5 = alloca i64, align 8
  %6 = alloca i32, align 4
  %7 = alloca i32, align 4
  store i64 %0, ptr %4, align 8, !tbaa !5
  store i64 %1, ptr %5, align 8, !tbaa !5
  %8 = load i64, ptr @n, align 8, !tbaa !5
  %9 = icmp eq i64 %8, 1
  br i1 %9, label %10, label %11

10:                                               ; preds = %2
  store i64 0, ptr %3, align 8
  br label %41

11:                                               ; preds = %2
  call void @llvm.lifetime.start.p0(i64 4, ptr %6) #2
  store i32 0, ptr %6, align 4, !tbaa !9
  %12 = load i64, ptr %4, align 8, !tbaa !5
  %13 = icmp eq i64 %12, 1
  br i1 %13, label %18, label %14

14:                                               ; preds = %11
  %15 = load i64, ptr %4, align 8, !tbaa !5
  %16 = load i64, ptr @n, align 8, !tbaa !5
  %17 = icmp eq i64 %15, %16
  br i1 %17, label %18, label %21

18:                                               ; preds = %14, %11
  %19 = load i32, ptr %6, align 4, !tbaa !9
  %20 = add nsw i32 %19, 1
  store i32 %20, ptr %6, align 4, !tbaa !9
  br label %21

21:                                               ; preds = %18, %14
  %22 = load i64, ptr %5, align 8, !tbaa !5
  %23 = icmp eq i64 %22, 1
  br i1 %23, label %28, label %24

24:                                               ; preds = %21
  %25 = load i64, ptr %5, align 8, !tbaa !5
  %26 = load i64, ptr @n, align 8, !tbaa !5
  %27 = icmp eq i64 %25, %26
  br i1 %27, label %28, label %31

28:                                               ; preds = %24, %21
  %29 = load i32, ptr %6, align 4, !tbaa !9
  %30 = add nsw i32 %29, 1
  store i32 %30, ptr %6, align 4, !tbaa !9
  br label %31

31:                                               ; preds = %28, %24
  %32 = load i32, ptr %6, align 4, !tbaa !9
  %33 = icmp eq i32 %32, 0
  br i1 %33, label %34, label %35

34:                                               ; preds = %31
  store i64 8, ptr %3, align 8
  store i32 1, ptr %7, align 4
  br label %40

35:                                               ; preds = %31
  %36 = load i32, ptr %6, align 4, !tbaa !9
  %37 = icmp eq i32 %36, 1
  br i1 %37, label %38, label %39

38:                                               ; preds = %35
  store i64 5, ptr %3, align 8
  store i32 1, ptr %7, align 4
  br label %40

39:                                               ; preds = %35
  store i64 3, ptr %3, align 8
  store i32 1, ptr %7, align 4
  br label %40

40:                                               ; preds = %39, %38, %34
  call void @llvm.lifetime.end.p0(i64 4, ptr %6) #2
  br label %41

41:                                               ; preds = %40, %10
  %42 = load i64, ptr %3, align 8
  ret i64 %42
}

attributes #0 = { nocallback nofree nosync nounwind willreturn memory(argmem: readwrite) }
attributes #1 = { 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 #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}


; 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"

@n = external dso_local local_unnamed_addr global i64, align 8

; Function Attrs: mustprogress nofree norecurse nosync nounwind willreturn memory(read, argmem: none, inaccessiblemem: none) uwtable
define dso_local noundef range(i64 0, 9) i64 @_Z9checkKingxx(i64 noundef %0, i64 noundef %1) local_unnamed_addr #0 {
  %3 = load i64, ptr @n, align 8
  %4 = icmp eq i64 %3, 1
  br i1 %4, label %11, label %5

5:                                                ; preds = %2
  %6 = icmp eq i64 %0, 1
  %7 = icmp eq i64 %3, %0
  %or.cond = or i1 %6, %7
  %.0 = zext i1 %or.cond to i32
  %8 = icmp eq i64 %1, 1
  %9 = icmp eq i64 %3, %1
  %or.cond15 = or i1 %8, %9
  %10 = select i1 %or.cond, i32 2, i32 1
  %.1 = select i1 %or.cond15, i32 %10, i32 %.0
  %switch.selectcmp = icmp eq i32 %.1, 1
  %switch.select = select i1 %switch.selectcmp, i64 5, i64 3
  %switch.selectcmp16 = icmp eq i32 %.1, 0
  %switch.select17 = select i1 %switch.selectcmp16, i64 8, i64 %switch.select
  br label %11

11:                                               ; preds = %5, %2
  %.110 = phi i64 [ 0, %2 ], [ %switch.select17, %5 ]
  ret i64 %.110
}

attributes #0 = { mustprogress nofree norecurse nosync nounwind willreturn memory(read, 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)"}


; Effective O3 passes: EarlyCSEPass,GlobalOptPass,IPSCCPPass,InferFunctionAttrsPass,InstCombinePass,PostOrderFunctionAttrsPass,SROAPass,SimplifyCFGPass