; LLVM IR from asllop/AppOS :: event (event)

; 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"

%struct.QueueStruct = type { ptr, i64, i32, i32, i32 }

; 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: nounwind uwtable
define dso_local i32 @event_wait(i8 noundef zeroext %0) #1 {
  %2 = alloca i32, align 4
  %3 = alloca i8, align 1
  %4 = alloca ptr, align 8
  %5 = alloca i32, align 4
  store i8 %0, ptr %3, align 1, !tbaa !5
  call void @llvm.lifetime.start.p0(i64 8, ptr %4) #3
  %6 = load i8, ptr %3, align 1, !tbaa !5
  %7 = zext i8 %6 to i32
  %8 = call ptr @get_queue(i32 noundef %7)
  store ptr %8, ptr %4, align 8, !tbaa !8
  %9 = load ptr, ptr %4, align 8, !tbaa !8
  %10 = icmp ne ptr %9, null
  br i1 %10, label %12, label %11

11:                                               ; preds = %1
  store i32 -508, ptr %2, align 4
  store i32 1, ptr %5, align 4
  br label %20

12:                                               ; preds = %1
  br label %13

13:                                               ; preds = %18, %12
  %14 = load ptr, ptr %4, align 8, !tbaa !8
  %15 = getelementptr inbounds %struct.QueueStruct, ptr %14, i32 0, i32 4
  %16 = load i32, ptr %15, align 8, !tbaa !10
  %17 = icmp eq i32 %16, 0
  br i1 %17, label %18, label %19

18:                                               ; preds = %13
  call void @core_sleep(i64 noundef 0)
  br label %13, !llvm.loop !14

19:                                               ; preds = %13
  store i32 0, ptr %2, align 4
  store i32 1, ptr %5, align 4
  br label %20

20:                                               ; preds = %19, %11
  call void @llvm.lifetime.end.p0(i64 8, ptr %4) #3
  %21 = load i32, ptr %2, align 4
  ret i32 %21
}

declare ptr @get_queue(i32 noundef) #2

declare void @core_sleep(i64 noundef) #2

attributes #0 = { nocallback nofree nosync nounwind willreturn memory(argmem: readwrite) }
attributes #1 = { 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 = { "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 = !{!"omnipotent char", !7, i64 0}
!7 = !{!"Simple C/C++ TBAA"}
!8 = !{!9, !9, i64 0}
!9 = !{!"any pointer", !6, i64 0}
!10 = !{!11, !13, i64 24}
!11 = !{!"QueueStruct", !9, i64 0, !12, i64 8, !13, i64 16, !13, i64 20, !13, i64 24}
!12 = !{!"long", !6, i64 0}
!13 = !{!"int", !6, i64 0}
!14 = distinct !{!14, !15}
!15 = !{!"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: nounwind uwtable
define dso_local range(i32 -508, 1) i32 @event_wait(i8 noundef zeroext %0) local_unnamed_addr #0 {
  %2 = zext i8 %0 to i32
  %3 = tail call ptr @get_queue(i32 noundef %2) #2
  %.not = icmp eq ptr %3, null
  br i1 %.not, label %.loopexit, label %.preheader

.preheader:                                       ; preds = %1
  %4 = getelementptr inbounds i8, ptr %3, i64 24
  %5 = load i32, ptr %4, align 8, !tbaa !5
  %6 = icmp eq i32 %5, 0
  br i1 %6, label %.lr.ph, label %.loopexit

.lr.ph:                                           ; preds = %.preheader, %.lr.ph
  tail call void @core_sleep(i64 noundef 0) #2
  %7 = load i32, ptr %4, align 8, !tbaa !5
  %8 = icmp eq i32 %7, 0
  br i1 %8, label %.lr.ph, label %.loopexit, !llvm.loop !12

.loopexit:                                        ; preds = %.lr.ph, %.preheader, %1
  %.0 = phi i32 [ -508, %1 ], [ 0, %.preheader ], [ 0, %.lr.ph ]
  ret i32 %.0
}

declare ptr @get_queue(i32 noundef) local_unnamed_addr #1

declare void @core_sleep(i64 noundef) local_unnamed_addr #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 = { "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, !11, i64 24}
!6 = !{!"QueueStruct", !7, i64 0, !10, i64 8, !11, i64 16, !11, i64 20, !11, i64 24}
!7 = !{!"any pointer", !8, i64 0}
!8 = !{!"omnipotent char", !9, i64 0}
!9 = !{!"Simple C/C++ TBAA"}
!10 = !{!"long", !8, i64 0}
!11 = !{!"int", !8, i64 0}
!12 = distinct !{!12, !13}
!13 = !{!"llvm.loop.mustprogress"}


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