; LLVM IR from oservo/aiFi :: queue (queueDequeue)

; 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.linkedList = type { ptr, ptr, ptr }
%struct.linkedListNode = type { ptr, ptr, ptr }

; 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 ptr @queueDequeue(ptr noundef %0) #1 {
  %2 = alloca ptr, align 8
  %3 = alloca ptr, align 8
  %4 = alloca ptr, align 8
  store ptr %0, ptr %2, align 8, !tbaa !5
  call void @llvm.lifetime.start.p0(i64 8, ptr %3) #3
  %5 = load ptr, ptr %2, align 8, !tbaa !5
  %6 = getelementptr inbounds %struct.linkedList, ptr %5, i32 0, i32 0
  %7 = load ptr, ptr %6, align 8, !tbaa !9
  store ptr %7, ptr %3, align 8, !tbaa !5
  call void @llvm.lifetime.start.p0(i64 8, ptr %4) #3
  %8 = load ptr, ptr %2, align 8, !tbaa !5
  %9 = getelementptr inbounds %struct.linkedList, ptr %8, i32 0, i32 0
  %10 = load ptr, ptr %9, align 8, !tbaa !9
  %11 = icmp eq ptr %10, null
  br i1 %11, label %12, label %13

12:                                               ; preds = %1
  store ptr null, ptr %4, align 8, !tbaa !5
  br label %59

13:                                               ; preds = %1
  %14 = load ptr, ptr %2, align 8, !tbaa !5
  %15 = getelementptr inbounds %struct.linkedList, ptr %14, i32 0, i32 0
  %16 = load ptr, ptr %15, align 8, !tbaa !9
  %17 = load ptr, ptr %2, align 8, !tbaa !5
  %18 = getelementptr inbounds %struct.linkedList, ptr %17, i32 0, i32 1
  %19 = load ptr, ptr %18, align 8, !tbaa !11
  %20 = icmp eq ptr %16, %19
  br i1 %20, label %21, label %30

21:                                               ; preds = %13
  %22 = load ptr, ptr %2, align 8, !tbaa !5
  %23 = getelementptr inbounds %struct.linkedList, ptr %22, i32 0, i32 1
  store ptr null, ptr %23, align 8, !tbaa !11
  %24 = load ptr, ptr %2, align 8, !tbaa !5
  %25 = getelementptr inbounds %struct.linkedList, ptr %24, i32 0, i32 0
  store ptr null, ptr %25, align 8, !tbaa !9
  %26 = load ptr, ptr %3, align 8, !tbaa !5
  %27 = getelementptr inbounds %struct.linkedListNode, ptr %26, i32 0, i32 2
  %28 = load ptr, ptr %27, align 8, !tbaa !12
  store ptr %28, ptr %4, align 8, !tbaa !5
  %29 = load ptr, ptr %3, align 8, !tbaa !5
  call void @free(ptr noundef %29) #3
  br label %58

30:                                               ; preds = %13
  br label %31

31:                                               ; preds = %39, %30
  %32 = load ptr, ptr %3, align 8, !tbaa !5
  %33 = getelementptr inbounds %struct.linkedListNode, ptr %32, i32 0, i32 1
  %34 = load ptr, ptr %33, align 8, !tbaa !14
  %35 = load ptr, ptr %2, align 8, !tbaa !5
  %36 = getelementptr inbounds %struct.linkedList, ptr %35, i32 0, i32 1
  %37 = load ptr, ptr %36, align 8, !tbaa !11
  %38 = icmp ne ptr %34, %37
  br i1 %38, label %39, label %43

39:                                               ; preds = %31
  %40 = load ptr, ptr %3, align 8, !tbaa !5
  %41 = getelementptr inbounds %struct.linkedListNode, ptr %40, i32 0, i32 1
  %42 = load ptr, ptr %41, align 8, !tbaa !14
  store ptr %42, ptr %3, align 8, !tbaa !5
  br label %31, !llvm.loop !15

43:                                               ; preds = %31
  %44 = load ptr, ptr %3, align 8, !tbaa !5
  %45 = load ptr, ptr %2, align 8, !tbaa !5
  %46 = getelementptr inbounds %struct.linkedList, ptr %45, i32 0, i32 1
  store ptr %44, ptr %46, align 8, !tbaa !11
  %47 = load ptr, ptr %3, align 8, !tbaa !5
  %48 = getelementptr inbounds %struct.linkedListNode, ptr %47, i32 0, i32 1
  %49 = load ptr, ptr %48, align 8, !tbaa !14
  store ptr %49, ptr %3, align 8, !tbaa !5
  %50 = load ptr, ptr %2, align 8, !tbaa !5
  %51 = getelementptr inbounds %struct.linkedList, ptr %50, i32 0, i32 1
  %52 = load ptr, ptr %51, align 8, !tbaa !11
  %53 = getelementptr inbounds %struct.linkedListNode, ptr %52, i32 0, i32 1
  store ptr null, ptr %53, align 8, !tbaa !14
  %54 = load ptr, ptr %3, align 8, !tbaa !5
  %55 = getelementptr inbounds %struct.linkedListNode, ptr %54, i32 0, i32 2
  %56 = load ptr, ptr %55, align 8, !tbaa !12
  store ptr %56, ptr %4, align 8, !tbaa !5
  %57 = load ptr, ptr %3, align 8, !tbaa !5
  call void @free(ptr noundef %57) #3
  br label %58

58:                                               ; preds = %43, %21
  br label %59

59:                                               ; preds = %58, %12
  %60 = load ptr, ptr %4, align 8, !tbaa !5
  call void @llvm.lifetime.end.p0(i64 8, ptr %4) #3
  call void @llvm.lifetime.end.p0(i64 8, ptr %3) #3
  ret ptr %60
}

; 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 0}
!10 = !{!"linkedList", !6, i64 0, !6, i64 8, !6, i64 16}
!11 = !{!10, !6, i64 8}
!12 = !{!13, !6, i64 16}
!13 = !{!"linkedListNode", !6, i64 0, !6, i64 8, !6, i64 16}
!14 = !{!13, !6, i64 8}
!15 = distinct !{!15, !16}
!16 = !{!"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 ptr @queueDequeue(ptr nocapture noundef %0) local_unnamed_addr #0 {
  %2 = load ptr, ptr %0, align 8, !tbaa !5
  %3 = icmp eq ptr %2, null
  br i1 %3, label %17, label %4

4:                                                ; preds = %1
  %5 = getelementptr inbounds i8, ptr %0, i64 8
  %6 = load ptr, ptr %5, align 8, !tbaa !10
  %7 = icmp eq ptr %2, %6
  br i1 %7, label %8, label %.preheader

8:                                                ; preds = %4
  %9 = getelementptr inbounds i8, ptr %2, i64 16
  tail call void @llvm.memset.p0.i64(ptr noundef nonnull align 8 dereferenceable(16) %0, i8 0, i64 16, i1 false)
  %10 = load ptr, ptr %9, align 8, !tbaa !11
  tail call void @free(ptr noundef nonnull %2) #3
  br label %17

.preheader:                                       ; preds = %4, %.preheader
  %.018 = phi ptr [ %12, %.preheader ], [ %2, %4 ]
  %11 = getelementptr inbounds i8, ptr %.018, i64 8
  %12 = load ptr, ptr %11, align 8, !tbaa !13
  %.not = icmp eq ptr %12, %6
  br i1 %.not, label %13, label %.preheader, !llvm.loop !14

13:                                               ; preds = %.preheader
  %14 = getelementptr inbounds i8, ptr %.018, i64 8
  store ptr %.018, ptr %5, align 8, !tbaa !10
  store ptr null, ptr %14, align 8, !tbaa !13
  %15 = getelementptr inbounds i8, ptr %12, i64 16
  %16 = load ptr, ptr %15, align 8, !tbaa !11
  tail call void @free(ptr noundef %12) #3
  br label %17

17:                                               ; preds = %1, %8, %13
  %.0 = phi ptr [ %10, %8 ], [ %16, %13 ], [ null, %1 ]
  ret ptr %.0
}

; Function Attrs: mustprogress nounwind willreturn allockind("free") memory(argmem: readwrite, inaccessiblemem: readwrite)
declare void @free(ptr allocptr nocapture noundef) local_unnamed_addr #1

; Function Attrs: nocallback nofree nounwind willreturn memory(argmem: write)
declare void @llvm.memset.p0.i64(ptr nocapture writeonly, i8, i64, i1 immarg) #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 = { 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 = { nocallback nofree nounwind willreturn memory(argmem: write) }
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, !7, i64 0}
!6 = !{!"linkedList", !7, i64 0, !7, i64 8, !7, i64 16}
!7 = !{!"any pointer", !8, i64 0}
!8 = !{!"omnipotent char", !9, i64 0}
!9 = !{!"Simple C/C++ TBAA"}
!10 = !{!6, !7, i64 8}
!11 = !{!12, !7, i64 16}
!12 = !{!"linkedListNode", !7, i64 0, !7, i64 8, !7, i64 16}
!13 = !{!12, !7, i64 8}
!14 = distinct !{!14, !15}
!15 = !{!"llvm.loop.mustprogress"}


; Effective O3 passes: CorrelatedValuePropagationPass,EarlyCSEPass,GVNPass,GlobalOptPass,InferFunctionAttrsPass,InstCombinePass,InstSimplifyPass,LCSSAPass,LICMPass,LoopSimplifyPass,LoopUnrollPass,MemCpyOptPass,PostOrderFunctionAttrsPass,SROAPass,SimplifyCFGPass,TailCallElimPass