; LLVM IR from matz/streem :: src (queue)

; 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.strm_queue_node = type { ptr, ptr }
%struct.strm_queue = type { 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: nounwind allocsize(0)
declare noalias ptr @malloc(i64 noundef) #1

; 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 @strm_queue_add(ptr noundef %0, ptr noundef %1) #2 {
  %3 = alloca i32, align 4
  %4 = alloca ptr, align 8
  %5 = alloca ptr, align 8
  %6 = alloca ptr, align 8
  %7 = alloca ptr, align 8
  %8 = alloca ptr, align 8
  %9 = alloca i32, align 4
  store ptr %0, ptr %4, align 8, !tbaa !5
  store ptr %1, ptr %5, align 8, !tbaa !5
  call void @llvm.lifetime.start.p0(i64 8, ptr %6) #3
  %10 = call noalias ptr @malloc(i64 noundef 16) #4
  store ptr %10, ptr %6, align 8, !tbaa !5
  %11 = load ptr, ptr %5, align 8, !tbaa !5
  %12 = load ptr, ptr %6, align 8, !tbaa !5
  %13 = getelementptr inbounds %struct.strm_queue_node, ptr %12, i32 0, i32 1
  store ptr %11, ptr %13, align 8, !tbaa !9
  %14 = load ptr, ptr %6, align 8, !tbaa !5
  %15 = getelementptr inbounds %struct.strm_queue_node, ptr %14, i32 0, i32 0
  store ptr null, ptr %15, align 8, !tbaa !11
  br label %16

16:                                               ; preds = %64, %62, %2
  br label %17

17:                                               ; preds = %16
  call void @llvm.lifetime.start.p0(i64 8, ptr %7) #3
  %18 = load ptr, ptr %4, align 8, !tbaa !5
  %19 = getelementptr inbounds %struct.strm_queue, ptr %18, i32 0, i32 1
  %20 = load ptr, ptr %19, align 8, !tbaa !12
  store ptr %20, ptr %7, align 8, !tbaa !5
  call void @llvm.lifetime.start.p0(i64 8, ptr %8) #3
  %21 = load ptr, ptr %7, align 8, !tbaa !5
  %22 = getelementptr inbounds %struct.strm_queue_node, ptr %21, i32 0, i32 0
  %23 = load ptr, ptr %22, align 8, !tbaa !11
  store ptr %23, ptr %8, align 8, !tbaa !5
  %24 = load ptr, ptr %7, align 8, !tbaa !5
  %25 = load ptr, ptr %4, align 8, !tbaa !5
  %26 = getelementptr inbounds %struct.strm_queue, ptr %25, i32 0, i32 1
  %27 = load ptr, ptr %26, align 8, !tbaa !12
  %28 = icmp ne ptr %24, %27
  br i1 %28, label %29, label %30

29:                                               ; preds = %17
  store i32 2, ptr %9, align 4
  br label %62

30:                                               ; preds = %17
  %31 = load ptr, ptr %8, align 8, !tbaa !5
  %32 = icmp eq ptr %31, null
  br i1 %32, label %33, label %52

33:                                               ; preds = %30
  %34 = load ptr, ptr %7, align 8, !tbaa !5
  %35 = getelementptr inbounds %struct.strm_queue_node, ptr %34, i32 0, i32 0
  %36 = load ptr, ptr %8, align 8, !tbaa !5
  %37 = ptrtoint ptr %36 to i64
  %38 = load ptr, ptr %6, align 8, !tbaa !5
  %39 = ptrtoint ptr %38 to i64
  %40 = cmpxchg ptr %35, i64 %37, i64 %39 seq_cst seq_cst, align 8
  %41 = extractvalue { i64, i1 } %40, 1
  br i1 %41, label %42, label %51

42:                                               ; preds = %33
  %43 = load ptr, ptr %4, align 8, !tbaa !5
  %44 = getelementptr inbounds %struct.strm_queue, ptr %43, i32 0, i32 1
  %45 = load ptr, ptr %7, align 8, !tbaa !5
  %46 = ptrtoint ptr %45 to i64
  %47 = load ptr, ptr %6, align 8, !tbaa !5
  %48 = ptrtoint ptr %47 to i64
  %49 = cmpxchg ptr %44, i64 %46, i64 %48 seq_cst seq_cst, align 8
  %50 = extractvalue { i64, i1 } %49, 1
  store i32 1, ptr %3, align 4
  store i32 1, ptr %9, align 4
  br label %62

51:                                               ; preds = %33
  br label %61

52:                                               ; preds = %30
  %53 = load ptr, ptr %4, align 8, !tbaa !5
  %54 = getelementptr inbounds %struct.strm_queue, ptr %53, i32 0, i32 1
  %55 = load ptr, ptr %7, align 8, !tbaa !5
  %56 = ptrtoint ptr %55 to i64
  %57 = load ptr, ptr %8, align 8, !tbaa !5
  %58 = ptrtoint ptr %57 to i64
  %59 = cmpxchg ptr %54, i64 %56, i64 %58 seq_cst seq_cst, align 8
  %60 = extractvalue { i64, i1 } %59, 1
  br label %61

61:                                               ; preds = %52, %51
  store i32 0, ptr %9, align 4
  br label %62

62:                                               ; preds = %61, %42, %29
  call void @llvm.lifetime.end.p0(i64 8, ptr %8) #3
  call void @llvm.lifetime.end.p0(i64 8, ptr %7) #3
  %63 = load i32, ptr %9, align 4
  switch i32 %63, label %65 [
    i32 0, label %64
    i32 2, label %16
  ]

64:                                               ; preds = %62
  br label %16

65:                                               ; preds = %62
  call void @llvm.lifetime.end.p0(i64 8, ptr %6) #3
  %66 = load i32, ptr %3, align 4
  ret i32 %66
}

attributes #0 = { nocallback nofree nosync nounwind willreturn memory(argmem: readwrite) }
attributes #1 = { nounwind allocsize(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 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 #3 = { nounwind }
attributes #4 = { nounwind allocsize(0) }

!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 = !{!"strm_queue_node", !6, i64 0, !6, i64 8}
!11 = !{!10, !6, i64 0}
!12 = !{!13, !6, i64 8}
!13 = !{!"strm_queue", !6, i64 0, !6, i64 8}


; 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: mustprogress nofree nounwind willreturn allockind("alloc,uninitialized") allocsize(0) memory(inaccessiblemem: readwrite)
declare noalias noundef ptr @malloc(i64 noundef) local_unnamed_addr #0

; Function Attrs: nofree nounwind uwtable
define dso_local noundef i32 @strm_queue_add(ptr nocapture noundef %0, ptr noundef %1) local_unnamed_addr #1 {
  %3 = tail call noalias dereferenceable_or_null(16) ptr @malloc(i64 noundef 16) #2
  %4 = getelementptr inbounds i8, ptr %3, i64 8
  store ptr %1, ptr %4, align 8, !tbaa !5
  store ptr null, ptr %3, align 8, !tbaa !10
  %5 = getelementptr inbounds i8, ptr %0, i64 8
  %6 = ptrtoint ptr %3 to i64
  br label %7

7:                                                ; preds = %.backedge, %2
  %8 = load ptr, ptr %5, align 8, !tbaa !11
  %9 = load ptr, ptr %8, align 8, !tbaa !10
  %10 = icmp eq ptr %9, null
  br i1 %10, label %11, label %14

11:                                               ; preds = %7
  %12 = cmpxchg ptr %8, i64 0, i64 %6 seq_cst seq_cst, align 8
  %13 = extractvalue { i64, i1 } %12, 1
  br i1 %13, label %18, label %.backedge

14:                                               ; preds = %7
  %15 = ptrtoint ptr %8 to i64
  %16 = ptrtoint ptr %9 to i64
  %17 = cmpxchg ptr %5, i64 %15, i64 %16 seq_cst seq_cst, align 8
  br label %.backedge

.backedge:                                        ; preds = %14, %11
  br label %7

18:                                               ; preds = %11
  %19 = ptrtoint ptr %8 to i64
  %20 = cmpxchg ptr %5, i64 %19, i64 %6 seq_cst seq_cst, align 8
  ret i32 1
}

attributes #0 = { mustprogress nofree nounwind willreturn allockind("alloc,uninitialized") allocsize(0) memory(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 #1 = { nofree 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 allocsize(0) }

!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 8}
!6 = !{!"strm_queue_node", !7, i64 0, !7, i64 8}
!7 = !{!"any pointer", !8, i64 0}
!8 = !{!"omnipotent char", !9, i64 0}
!9 = !{!"Simple C/C++ TBAA"}
!10 = !{!6, !7, i64 0}
!11 = !{!12, !7, i64 8}
!12 = !{!"strm_queue", !7, i64 0, !7, i64 8}


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