; LLVM IR from pupnp/pupnp :: upnp/src/threadutil (LinkedList)

; 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 { %struct.LISTNODE, %struct.LISTNODE, i64, %struct.FREELIST, ptr, ptr }
%struct.LISTNODE = type { ptr, ptr, ptr }
%struct.FREELIST = type { ptr, i64, i32, i32 }

@.str = external hidden unnamed_addr constant [13 x i8], align 1
@.str.1 = external hidden unnamed_addr constant [78 x i8], align 1
@__PRETTY_FUNCTION__.ListHead = external hidden unnamed_addr constant [33 x i8], align 1

; Function Attrs: noreturn nounwind
declare void @__assert_fail(ptr noundef, ptr noundef, i32 noundef, ptr noundef) #0

; Function Attrs: nounwind uwtable
define dso_local ptr @ListHead(ptr noundef %0) #1 {
  %2 = alloca ptr, align 8
  %3 = alloca ptr, align 8
  store ptr %0, ptr %3, align 8, !tbaa !5
  %4 = load ptr, ptr %3, align 8, !tbaa !5
  %5 = icmp ne ptr %4, null
  br i1 %5, label %6, label %7

6:                                                ; preds = %1
  br label %8

7:                                                ; preds = %1
  call void @__assert_fail(ptr noundef @.str, ptr noundef @.str.1, i32 noundef 222, ptr noundef @__PRETTY_FUNCTION__.ListHead) #2
  unreachable

8:                                                ; preds = %6
  %9 = load ptr, ptr %3, align 8, !tbaa !5
  %10 = icmp ne ptr %9, null
  br i1 %10, label %12, label %11

11:                                               ; preds = %8
  store ptr null, ptr %2, align 8
  br label %23

12:                                               ; preds = %8
  %13 = load ptr, ptr %3, align 8, !tbaa !5
  %14 = getelementptr inbounds %struct.LINKEDLIST, ptr %13, i32 0, i32 2
  %15 = load i64, ptr %14, align 8, !tbaa !9
  %16 = icmp ne i64 %15, 0
  br i1 %16, label %18, label %17

17:                                               ; preds = %12
  store ptr null, ptr %2, align 8
  br label %23

18:                                               ; preds = %12
  %19 = load ptr, ptr %3, align 8, !tbaa !5
  %20 = getelementptr inbounds %struct.LINKEDLIST, ptr %19, i32 0, i32 0
  %21 = getelementptr inbounds %struct.LISTNODE, ptr %20, i32 0, i32 1
  %22 = load ptr, ptr %21, align 8, !tbaa !15
  store ptr %22, ptr %2, align 8
  br label %23

23:                                               ; preds = %18, %17, %11
  %24 = load ptr, ptr %2, align 8
  ret ptr %24
}

attributes #0 = { noreturn 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 #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 = { noreturn 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, !12, i64 48}
!10 = !{!"LINKEDLIST", !11, i64 0, !11, i64 24, !12, i64 48, !13, i64 56, !6, i64 80, !6, i64 88}
!11 = !{!"LISTNODE", !6, i64 0, !6, i64 8, !6, i64 16}
!12 = !{!"long", !7, i64 0}
!13 = !{!"FREELIST", !6, i64 0, !12, i64 8, !14, i64 16, !14, i64 20}
!14 = !{!"int", !7, i64 0}
!15 = !{!10, !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"

@.str = external hidden unnamed_addr constant [13 x i8], align 1
@.str.1 = external hidden unnamed_addr constant [78 x i8], align 1
@__PRETTY_FUNCTION__.ListHead = external hidden unnamed_addr constant [33 x i8], align 1

; Function Attrs: noreturn nounwind
declare void @__assert_fail(ptr noundef, ptr noundef, i32 noundef, ptr noundef) local_unnamed_addr #0

; Function Attrs: nounwind uwtable
define dso_local ptr @ListHead(ptr noundef readonly %0) local_unnamed_addr #1 {
  %.not = icmp eq ptr %0, null
  br i1 %.not, label %2, label %3

2:                                                ; preds = %1
  tail call void @__assert_fail(ptr noundef nonnull @.str, ptr noundef nonnull @.str.1, i32 noundef 222, ptr noundef nonnull @__PRETTY_FUNCTION__.ListHead) #2
  unreachable

3:                                                ; preds = %1
  %4 = getelementptr inbounds i8, ptr %0, i64 48
  %5 = load i64, ptr %4, align 8, !tbaa !5
  %.not6 = icmp eq i64 %5, 0
  br i1 %.not6, label %9, label %6

6:                                                ; preds = %3
  %7 = getelementptr inbounds i8, ptr %0, i64 8
  %8 = load ptr, ptr %7, align 8, !tbaa !14
  br label %9

9:                                                ; preds = %3, %6
  %.0 = phi ptr [ %8, %6 ], [ null, %3 ]
  ret ptr %.0
}

attributes #0 = { noreturn 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 #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 = { noreturn 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 48}
!6 = !{!"LINKEDLIST", !7, i64 0, !7, i64 24, !11, i64 48, !12, i64 56, !8, i64 80, !8, i64 88}
!7 = !{!"LISTNODE", !8, i64 0, !8, i64 8, !8, i64 16}
!8 = !{!"any pointer", !9, i64 0}
!9 = !{!"omnipotent char", !10, i64 0}
!10 = !{!"Simple C/C++ TBAA"}
!11 = !{!"long", !9, i64 0}
!12 = !{!"FREELIST", !8, i64 0, !11, i64 8, !13, i64 16, !13, i64 20}
!13 = !{!"int", !9, i64 0}
!14 = !{!6, !8, i64 8}


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