; LLVM IR from kala13x/libxutils :: src/data (list)

; 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.xlist = type { ptr, ptr, %struct.xlist_data, i8 }
%struct.xlist_data = type { ptr, ptr, ptr, i64 }

; Function Attrs: nounwind uwtable
declare dso_local void @XListData_MergeCtx(ptr noundef, ptr noundef) #0

; Function Attrs: nocallback nofree nosync nounwind willreturn memory(argmem: readwrite)
declare void @llvm.lifetime.start.p0(i64 immarg, ptr nocapture) #1

; Function Attrs: nocallback nofree nosync nounwind willreturn memory(argmem: readwrite)
declare void @llvm.lifetime.end.p0(i64 immarg, ptr nocapture) #1

; Function Attrs: nounwind uwtable
declare dso_local ptr @XList_GetHead(ptr noundef) #0

; Function Attrs: nounwind uwtable
define dso_local ptr @XList_InsertHead(ptr noundef %0, ptr noundef %1) #0 {
  %3 = alloca ptr, align 8
  %4 = alloca ptr, align 8
  %5 = alloca ptr, align 8
  %6 = alloca ptr, align 8
  store ptr %0, ptr %4, align 8, !tbaa !5
  store ptr %1, ptr %5, align 8, !tbaa !5
  %7 = load ptr, ptr %4, align 8, !tbaa !5
  %8 = icmp eq ptr %7, null
  br i1 %8, label %12, label %9

9:                                                ; preds = %2
  %10 = load ptr, ptr %5, align 8, !tbaa !5
  %11 = icmp eq ptr %10, null
  br i1 %11, label %12, label %13

12:                                               ; preds = %9, %2
  store ptr null, ptr %3, align 8
  br label %29

13:                                               ; preds = %9
  call void @llvm.lifetime.start.p0(i64 8, ptr %6) #2
  %14 = load ptr, ptr %4, align 8, !tbaa !5
  %15 = call ptr @XList_GetHead(ptr noundef %14)
  store ptr %15, ptr %6, align 8, !tbaa !5
  %16 = load ptr, ptr %5, align 8, !tbaa !5
  %17 = getelementptr inbounds %struct.xlist, ptr %16, i32 0, i32 2
  %18 = load ptr, ptr %6, align 8, !tbaa !5
  %19 = getelementptr inbounds %struct.xlist, ptr %18, i32 0, i32 2
  call void @XListData_MergeCtx(ptr noundef %17, ptr noundef %19)
  %20 = load ptr, ptr %5, align 8, !tbaa !5
  %21 = load ptr, ptr %6, align 8, !tbaa !5
  %22 = getelementptr inbounds %struct.xlist, ptr %21, i32 0, i32 1
  store ptr %20, ptr %22, align 8, !tbaa !9
  %23 = load ptr, ptr %6, align 8, !tbaa !5
  %24 = load ptr, ptr %5, align 8, !tbaa !5
  %25 = getelementptr inbounds %struct.xlist, ptr %24, i32 0, i32 0
  store ptr %23, ptr %25, align 8, !tbaa !13
  %26 = load ptr, ptr %5, align 8, !tbaa !5
  %27 = getelementptr inbounds %struct.xlist, ptr %26, i32 0, i32 1
  store ptr null, ptr %27, align 8, !tbaa !9
  %28 = load ptr, ptr %5, align 8, !tbaa !5
  store ptr %28, ptr %3, align 8
  call void @llvm.lifetime.end.p0(i64 8, ptr %6) #2
  br label %29

29:                                               ; preds = %13, %12
  %30 = load ptr, ptr %3, align 8
  ret ptr %30
}

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 = { nocallback nofree nosync nounwind willreturn memory(argmem: readwrite) }
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 = !{!"xlist", !6, i64 0, !6, i64 8, !11, i64 16, !7, i64 48}
!11 = !{!"xlist_data", !6, i64 0, !6, i64 8, !6, i64 16, !12, i64 24}
!12 = !{!"long", !7, i64 0}
!13 = !{!10, !6, i64 0}


; 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
declare dso_local void @XListData_MergeCtx(ptr noundef, ptr noundef) local_unnamed_addr #0

; Function Attrs: nounwind uwtable
declare dso_local ptr @XList_GetHead(ptr noundef) local_unnamed_addr #0

; Function Attrs: nounwind uwtable
define dso_local noundef ptr @XList_InsertHead(ptr noundef %0, ptr noundef %1) local_unnamed_addr #0 {
  %3 = icmp eq ptr %0, null
  %4 = icmp eq ptr %1, null
  %or.cond = or i1 %3, %4
  br i1 %or.cond, label %11, label %5

5:                                                ; preds = %2
  %6 = tail call ptr @XList_GetHead(ptr noundef nonnull %0)
  %7 = getelementptr inbounds i8, ptr %1, i64 16
  %8 = getelementptr inbounds i8, ptr %6, i64 16
  tail call void @XListData_MergeCtx(ptr noundef nonnull %7, ptr noundef nonnull %8)
  %9 = getelementptr inbounds i8, ptr %6, i64 8
  store ptr %1, ptr %9, align 8, !tbaa !5
  store ptr %6, ptr %1, align 8, !tbaa !12
  %10 = getelementptr inbounds i8, ptr %1, i64 8
  store ptr null, ptr %10, align 8, !tbaa !5
  br label %11

11:                                               ; preds = %2, %5
  %.0 = phi ptr [ %1, %5 ], [ null, %2 ]
  ret ptr %.0
}

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" }

!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 = !{!"xlist", !7, i64 0, !7, i64 8, !10, i64 16, !8, i64 48}
!7 = !{!"any pointer", !8, i64 0}
!8 = !{!"omnipotent char", !9, i64 0}
!9 = !{!"Simple C/C++ TBAA"}
!10 = !{!"xlist_data", !7, i64 0, !7, i64 8, !7, i64 16, !11, i64 24}
!11 = !{!"long", !8, i64 0}
!12 = !{!6, !7, i64 0}


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