; LLVM IR from mist64/perfect6502 :: cbmbasic (cbmbasic)

; 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: nounwind uwtable
define dso_local i32 @main() #0 {
  %1 = alloca i32, align 4
  %2 = alloca i32, align 4
  %3 = alloca ptr, align 8
  store i32 0, ptr %1, align 4
  call void @llvm.lifetime.start.p0(i64 4, ptr %2) #3
  store i32 0, ptr %2, align 4, !tbaa !5
  call void @llvm.lifetime.start.p0(i64 8, ptr %3) #3
  %4 = call ptr (...) @initAndResetChip()
  store ptr %4, ptr %3, align 8, !tbaa !9
  call void (...) @init_monitor()
  br label %5

5:                                                ; preds = %15, %0
  %6 = load ptr, ptr %3, align 8, !tbaa !9
  call void @step(ptr noundef %6)
  %7 = load i32, ptr %2, align 4, !tbaa !5
  %8 = icmp ne i32 %7, 0
  %9 = xor i1 %8, true
  %10 = zext i1 %9 to i32
  store i32 %10, ptr %2, align 4, !tbaa !5
  %11 = load i32, ptr %2, align 4, !tbaa !5
  %12 = icmp ne i32 %11, 0
  br i1 %12, label %13, label %15

13:                                               ; preds = %5
  %14 = load ptr, ptr %3, align 8, !tbaa !9
  call void (ptr, ...) @handle_monitor(ptr noundef %14)
  br label %15

15:                                               ; preds = %13, %5
  br label %5
}

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

declare ptr @initAndResetChip(...) #2

declare void @init_monitor(...) #2

declare void @step(ptr noundef) #2

declare void @handle_monitor(...) #2

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 = { "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 = !{!"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}


; 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: noreturn nounwind uwtable
define dso_local noundef i32 @main() local_unnamed_addr #0 {
  %1 = tail call ptr (...) @initAndResetChip() #2
  tail call void (...) @init_monitor() #2
  br label %2

2:                                                ; preds = %.backedge, %0
  %.0 = phi i32 [ 0, %0 ], [ %3, %.backedge ]
  tail call void @step(ptr noundef %1) #2
  %.not = icmp eq i32 %.0, 0
  %3 = xor i32 %.0, 1
  br i1 %.not, label %4, label %.backedge

4:                                                ; preds = %2
  tail call void (ptr, ...) @handle_monitor(ptr noundef %1) #2
  br label %.backedge

.backedge:                                        ; preds = %4, %2
  br label %2
}

declare ptr @initAndResetChip(...) local_unnamed_addr #1

declare void @init_monitor(...) local_unnamed_addr #1

declare void @step(ptr noundef) local_unnamed_addr #1

declare void @handle_monitor(...) local_unnamed_addr #1

attributes #0 = { noreturn 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 = { "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)"}


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