; LLVM IR from AlgoGenesis/C :: Miscellaneous Algorithms/DeadLock Detection (Program)

; 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.Process = type { i32, ptr, ptr, i32 }
%struct.Resource = type { i32, ptr, ptr }

@Phead = external dso_local global ptr, align 8
@Rhead = external dso_local global ptr, 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: nounwind uwtable
define dso_local void @Cleanup() #1 {
  %1 = alloca ptr, align 8
  %2 = alloca ptr, align 8
  %3 = alloca ptr, align 8
  %4 = alloca ptr, align 8
  call void @llvm.lifetime.start.p0(i64 8, ptr %1) #3
  %5 = load ptr, ptr @Phead, align 8, !tbaa !5
  store ptr %5, ptr %1, align 8, !tbaa !5
  br label %6

6:                                                ; preds = %9, %0
  %7 = load ptr, ptr %1, align 8, !tbaa !5
  %8 = icmp ne ptr %7, null
  br i1 %8, label %9, label %15

9:                                                ; preds = %6
  call void @llvm.lifetime.start.p0(i64 8, ptr %2) #3
  %10 = load ptr, ptr %1, align 8, !tbaa !5
  store ptr %10, ptr %2, align 8, !tbaa !5
  %11 = load ptr, ptr %1, align 8, !tbaa !5
  %12 = getelementptr inbounds %struct.Process, ptr %11, i32 0, i32 1
  %13 = load ptr, ptr %12, align 8, !tbaa !9
  store ptr %13, ptr %1, align 8, !tbaa !5
  %14 = load ptr, ptr %2, align 8, !tbaa !5
  call void @free(ptr noundef %14) #3
  call void @llvm.lifetime.end.p0(i64 8, ptr %2) #3
  br label %6, !llvm.loop !12

15:                                               ; preds = %6
  call void @llvm.lifetime.start.p0(i64 8, ptr %3) #3
  %16 = load ptr, ptr @Rhead, align 8, !tbaa !5
  store ptr %16, ptr %3, align 8, !tbaa !5
  br label %17

17:                                               ; preds = %20, %15
  %18 = load ptr, ptr %3, align 8, !tbaa !5
  %19 = icmp ne ptr %18, null
  br i1 %19, label %20, label %26

20:                                               ; preds = %17
  call void @llvm.lifetime.start.p0(i64 8, ptr %4) #3
  %21 = load ptr, ptr %3, align 8, !tbaa !5
  store ptr %21, ptr %4, align 8, !tbaa !5
  %22 = load ptr, ptr %3, align 8, !tbaa !5
  %23 = getelementptr inbounds %struct.Resource, ptr %22, i32 0, i32 1
  %24 = load ptr, ptr %23, align 8, !tbaa !14
  store ptr %24, ptr %3, align 8, !tbaa !5
  %25 = load ptr, ptr %4, align 8, !tbaa !5
  call void @free(ptr noundef %25) #3
  call void @llvm.lifetime.end.p0(i64 8, ptr %4) #3
  br label %17, !llvm.loop !16

26:                                               ; preds = %17
  call void @llvm.lifetime.end.p0(i64 8, ptr %3) #3
  call void @llvm.lifetime.end.p0(i64 8, ptr %1) #3
  ret void
}

; Function Attrs: nounwind
declare void @free(ptr 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 = { 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 = !{!10, !6, i64 8}
!10 = !{!"Process", !11, i64 0, !6, i64 8, !6, i64 16, !11, i64 24}
!11 = !{!"int", !7, i64 0}
!12 = distinct !{!12, !13}
!13 = !{!"llvm.loop.mustprogress"}
!14 = !{!15, !6, i64 8}
!15 = !{!"Resource", !11, i64 0, !6, i64 8, !6, i64 16}
!16 = distinct !{!16, !13}


; 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"

@Phead = external dso_local local_unnamed_addr global ptr, align 8
@Rhead = external dso_local local_unnamed_addr global ptr, align 8

; Function Attrs: nounwind uwtable
define dso_local void @Cleanup() local_unnamed_addr #0 {
  %1 = load ptr, ptr @Phead, align 8, !tbaa !5
  %.not10 = icmp eq ptr %1, null
  br i1 %.not10, label %._crit_edge, label %.lr.ph

.lr.ph:                                           ; preds = %0, %.lr.ph
  %.011 = phi ptr [ %3, %.lr.ph ], [ %1, %0 ]
  %2 = getelementptr inbounds i8, ptr %.011, i64 8
  %3 = load ptr, ptr %2, align 8, !tbaa !9
  tail call void @free(ptr noundef nonnull %.011) #2
  %.not = icmp eq ptr %3, null
  br i1 %.not, label %._crit_edge, label %.lr.ph, !llvm.loop !12

._crit_edge:                                      ; preds = %.lr.ph, %0
  %4 = load ptr, ptr @Rhead, align 8, !tbaa !5
  %.not912 = icmp eq ptr %4, null
  br i1 %.not912, label %._crit_edge16, label %.lr.ph15

.lr.ph15:                                         ; preds = %._crit_edge, %.lr.ph15
  %.0813 = phi ptr [ %6, %.lr.ph15 ], [ %4, %._crit_edge ]
  %5 = getelementptr inbounds i8, ptr %.0813, i64 8
  %6 = load ptr, ptr %5, align 8, !tbaa !14
  tail call void @free(ptr noundef nonnull %.0813) #2
  %.not9 = icmp eq ptr %6, null
  br i1 %.not9, label %._crit_edge16, label %.lr.ph15, !llvm.loop !16

._crit_edge16:                                    ; preds = %.lr.ph15, %._crit_edge
  ret void
}

; Function Attrs: mustprogress nounwind willreturn allockind("free") memory(argmem: readwrite, inaccessiblemem: readwrite)
declare void @free(ptr allocptr nocapture 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 = { mustprogress nounwind willreturn allockind("free") memory(argmem: readwrite, inaccessiblemem: readwrite) "alloc-family"="malloc" "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 = !{!"any pointer", !7, i64 0}
!7 = !{!"omnipotent char", !8, i64 0}
!8 = !{!"Simple C/C++ TBAA"}
!9 = !{!10, !6, i64 8}
!10 = !{!"Process", !11, i64 0, !6, i64 8, !6, i64 16, !11, i64 24}
!11 = !{!"int", !7, i64 0}
!12 = distinct !{!12, !13}
!13 = !{!"llvm.loop.mustprogress"}
!14 = !{!15, !6, i64 8}
!15 = !{!"Resource", !11, i64 0, !6, i64 8, !6, i64 16}
!16 = distinct !{!16, !13}


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