; LLVM IR from BurntSushi/clibs :: libds (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.DSLinkedList = type { i32, ptr, ptr }
%struct.DSListNode = 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 void @ds_list_sort(ptr noundef %0, ptr noundef %1) #1 {
  %3 = alloca ptr, align 8
  %4 = alloca ptr, align 8
  %5 = alloca ptr, align 8
  store ptr %0, ptr %3, align 8, !tbaa !5
  store ptr %1, ptr %4, align 8, !tbaa !5
  call void @llvm.lifetime.start.p0(i64 8, ptr %5) #2
  %6 = load ptr, ptr %3, align 8, !tbaa !5
  %7 = getelementptr inbounds %struct.DSLinkedList, ptr %6, i32 0, i32 1
  %8 = load ptr, ptr %7, align 8, !tbaa !9
  %9 = load ptr, ptr %4, align 8, !tbaa !5
  %10 = call ptr @ds_list_mergesort(ptr noundef %8, ptr noundef %9)
  store ptr %10, ptr %5, align 8, !tbaa !5
  %11 = load ptr, ptr %5, align 8, !tbaa !5
  %12 = load ptr, ptr %3, align 8, !tbaa !5
  %13 = getelementptr inbounds %struct.DSLinkedList, ptr %12, i32 0, i32 1
  store ptr %11, ptr %13, align 8, !tbaa !9
  %14 = load ptr, ptr %3, align 8, !tbaa !5
  %15 = getelementptr inbounds %struct.DSLinkedList, ptr %14, i32 0, i32 1
  %16 = load ptr, ptr %15, align 8, !tbaa !9
  %17 = getelementptr inbounds %struct.DSListNode, ptr %16, i32 0, i32 1
  store ptr null, ptr %17, align 8, !tbaa !12
  br label %18

18:                                               ; preds = %23, %2
  %19 = load ptr, ptr %5, align 8, !tbaa !5
  %20 = getelementptr inbounds %struct.DSListNode, ptr %19, i32 0, i32 2
  %21 = load ptr, ptr %20, align 8, !tbaa !14
  %22 = icmp ne ptr %21, null
  br i1 %22, label %23, label %32

23:                                               ; preds = %18
  %24 = load ptr, ptr %5, align 8, !tbaa !5
  %25 = load ptr, ptr %5, align 8, !tbaa !5
  %26 = getelementptr inbounds %struct.DSListNode, ptr %25, i32 0, i32 2
  %27 = load ptr, ptr %26, align 8, !tbaa !14
  %28 = getelementptr inbounds %struct.DSListNode, ptr %27, i32 0, i32 1
  store ptr %24, ptr %28, align 8, !tbaa !12
  %29 = load ptr, ptr %5, align 8, !tbaa !5
  %30 = getelementptr inbounds %struct.DSListNode, ptr %29, i32 0, i32 2
  %31 = load ptr, ptr %30, align 8, !tbaa !14
  store ptr %31, ptr %5, align 8, !tbaa !5
  br label %18, !llvm.loop !15

32:                                               ; preds = %18
  %33 = load ptr, ptr %5, align 8, !tbaa !5
  %34 = load ptr, ptr %3, align 8, !tbaa !5
  %35 = getelementptr inbounds %struct.DSLinkedList, ptr %34, i32 0, i32 2
  store ptr %33, ptr %35, align 8, !tbaa !17
  %36 = load ptr, ptr %3, align 8, !tbaa !5
  %37 = getelementptr inbounds %struct.DSLinkedList, ptr %36, i32 0, i32 2
  %38 = load ptr, ptr %37, align 8, !tbaa !17
  %39 = getelementptr inbounds %struct.DSListNode, ptr %38, i32 0, i32 2
  store ptr null, ptr %39, align 8, !tbaa !14
  call void @llvm.lifetime.end.p0(i64 8, ptr %5) #2
  ret void
}

; Function Attrs: nounwind uwtable
declare hidden ptr @ds_list_mergesort(ptr noundef, ptr noundef) #1

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 }

!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 = !{!"DSLinkedList", !11, i64 0, !6, i64 8, !6, i64 16}
!11 = !{!"int", !7, i64 0}
!12 = !{!13, !6, i64 8}
!13 = !{!"DSListNode", !6, i64 0, !6, i64 8, !6, i64 16}
!14 = !{!13, !6, i64 16}
!15 = distinct !{!15, !16}
!16 = !{!"llvm.loop.mustprogress"}
!17 = !{!10, !6, i64 16}


; 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 void @ds_list_sort(ptr nocapture noundef %0, ptr noundef %1) local_unnamed_addr #0 {
  %3 = getelementptr inbounds i8, ptr %0, i64 8
  %4 = load ptr, ptr %3, align 8, !tbaa !5
  %5 = tail call ptr @ds_list_mergesort(ptr noundef %4, ptr noundef %1)
  store ptr %5, ptr %3, align 8, !tbaa !5
  %6 = getelementptr inbounds i8, ptr %5, i64 8
  store ptr null, ptr %6, align 8, !tbaa !11
  %7 = getelementptr inbounds i8, ptr %5, i64 16
  %8 = load ptr, ptr %7, align 8, !tbaa !13
  %.not14 = icmp eq ptr %8, null
  br i1 %.not14, label %._crit_edge, label %.lr.ph

.lr.ph:                                           ; preds = %2, %.lr.ph
  %9 = phi ptr [ %12, %.lr.ph ], [ %8, %2 ]
  %.015 = phi ptr [ %9, %.lr.ph ], [ %5, %2 ]
  %10 = getelementptr inbounds i8, ptr %9, i64 8
  store ptr %.015, ptr %10, align 8, !tbaa !11
  %11 = getelementptr inbounds i8, ptr %9, i64 16
  %12 = load ptr, ptr %11, align 8, !tbaa !13
  %.not = icmp eq ptr %12, null
  br i1 %.not, label %._crit_edge, label %.lr.ph, !llvm.loop !14

._crit_edge:                                      ; preds = %.lr.ph, %2
  %.0.lcssa13 = phi ptr [ %5, %2 ], [ %9, %.lr.ph ]
  %13 = getelementptr inbounds i8, ptr %.0.lcssa13, i64 16
  %14 = getelementptr inbounds i8, ptr %0, i64 16
  store ptr %.0.lcssa13, ptr %14, align 8, !tbaa !16
  store ptr null, ptr %13, align 8, !tbaa !13
  ret void
}

; Function Attrs: nounwind uwtable
declare hidden ptr @ds_list_mergesort(ptr noundef, ptr noundef) local_unnamed_addr #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, !10, i64 8}
!6 = !{!"DSLinkedList", !7, i64 0, !10, i64 8, !10, i64 16}
!7 = !{!"int", !8, i64 0}
!8 = !{!"omnipotent char", !9, i64 0}
!9 = !{!"Simple C/C++ TBAA"}
!10 = !{!"any pointer", !8, i64 0}
!11 = !{!12, !10, i64 8}
!12 = !{!"DSListNode", !10, i64 0, !10, i64 8, !10, i64 16}
!13 = !{!12, !10, i64 16}
!14 = distinct !{!14, !15}
!15 = !{!"llvm.loop.mustprogress"}
!16 = !{!6, !10, i64 16}


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