; LLVM IR from recp/ds :: src (forward_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.FList = type { ptr, ptr, ptr, ptr, i64 }
%struct.FListItem = type { ptr, ptr }
%struct.DsAllocator = type { ptr, ptr, ptr, ptr, 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 @flist_empty(ptr noundef %0) #1 {
  %2 = alloca ptr, align 8
  %3 = alloca ptr, align 8
  %4 = alloca ptr, align 8
  %5 = alloca ptr, align 8
  store ptr %0, ptr %2, align 8, !tbaa !5
  call void @llvm.lifetime.start.p0(i64 8, ptr %3) #2
  call void @llvm.lifetime.start.p0(i64 8, ptr %4) #2
  call void @llvm.lifetime.start.p0(i64 8, ptr %5) #2
  %6 = load ptr, ptr %2, align 8, !tbaa !5
  %7 = getelementptr inbounds %struct.FList, ptr %6, i32 0, i32 2
  %8 = load ptr, ptr %7, align 8, !tbaa !9
  store ptr %8, ptr %3, align 8, !tbaa !5
  %9 = load ptr, ptr %2, align 8, !tbaa !5
  %10 = getelementptr inbounds %struct.FList, ptr %9, i32 0, i32 0
  %11 = load ptr, ptr %10, align 8, !tbaa !12
  store ptr %11, ptr %4, align 8, !tbaa !5
  store ptr null, ptr %5, align 8, !tbaa !5
  br label %12

12:                                               ; preds = %30, %1
  %13 = load ptr, ptr %4, align 8, !tbaa !5
  %14 = icmp ne ptr %13, null
  br i1 %14, label %15, label %35

15:                                               ; preds = %12
  %16 = load ptr, ptr %4, align 8, !tbaa !5
  store ptr %16, ptr %5, align 8, !tbaa !5
  %17 = load ptr, ptr %4, align 8, !tbaa !5
  %18 = getelementptr inbounds %struct.FListItem, ptr %17, i32 0, i32 0
  %19 = load ptr, ptr %18, align 8, !tbaa !13
  store ptr %19, ptr %4, align 8, !tbaa !5
  %20 = load ptr, ptr %2, align 8, !tbaa !5
  %21 = getelementptr inbounds %struct.FList, ptr %20, i32 0, i32 3
  %22 = load ptr, ptr %21, align 8, !tbaa !15
  %23 = icmp ne ptr %22, null
  br i1 %23, label %24, label %30

24:                                               ; preds = %15
  %25 = load ptr, ptr %2, align 8, !tbaa !5
  %26 = getelementptr inbounds %struct.FList, ptr %25, i32 0, i32 3
  %27 = load ptr, ptr %26, align 8, !tbaa !15
  %28 = load ptr, ptr %2, align 8, !tbaa !5
  %29 = load ptr, ptr %5, align 8, !tbaa !5
  call void %27(ptr noundef %28, ptr noundef %29)
  br label %30

30:                                               ; preds = %24, %15
  %31 = load ptr, ptr %3, align 8, !tbaa !5
  %32 = getelementptr inbounds %struct.DsAllocator, ptr %31, i32 0, i32 5
  %33 = load ptr, ptr %32, align 8, !tbaa !16
  %34 = load ptr, ptr %5, align 8, !tbaa !5
  call void %33(ptr noundef %34)
  br label %12, !llvm.loop !18

35:                                               ; preds = %12
  %36 = load ptr, ptr %2, align 8, !tbaa !5
  %37 = getelementptr inbounds %struct.FList, ptr %36, i32 0, i32 0
  store ptr null, ptr %37, align 8, !tbaa !12
  %38 = load ptr, ptr %2, align 8, !tbaa !5
  %39 = getelementptr inbounds %struct.FList, ptr %38, i32 0, i32 1
  store ptr null, ptr %39, align 8, !tbaa !20
  %40 = load ptr, ptr %2, align 8, !tbaa !5
  %41 = getelementptr inbounds %struct.FList, ptr %40, i32 0, i32 4
  store i64 0, ptr %41, align 8, !tbaa !21
  call void @llvm.lifetime.end.p0(i64 8, ptr %5) #2
  call void @llvm.lifetime.end.p0(i64 8, ptr %4) #2
  call void @llvm.lifetime.end.p0(i64 8, ptr %3) #2
  ret void
}

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 16}
!10 = !{!"FList", !6, i64 0, !6, i64 8, !6, i64 16, !6, i64 24, !11, i64 32}
!11 = !{!"long", !7, i64 0}
!12 = !{!10, !6, i64 0}
!13 = !{!14, !6, i64 0}
!14 = !{!"FListItem", !6, i64 0, !6, i64 8}
!15 = !{!10, !6, i64 24}
!16 = !{!17, !6, i64 40}
!17 = !{!"DsAllocator", !6, i64 0, !6, i64 8, !6, i64 16, !6, i64 24, !6, i64 32, !6, i64 40, !6, i64 48}
!18 = distinct !{!18, !19}
!19 = !{!"llvm.loop.mustprogress"}
!20 = !{!10, !6, i64 8}
!21 = !{!10, !11, i64 32}


; 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 @flist_empty(ptr noundef %0) local_unnamed_addr #0 {
  %2 = load ptr, ptr %0, align 8, !tbaa !5
  %.not16 = icmp eq ptr %2, null
  br i1 %.not16, label %._crit_edge, label %.lr.ph

.lr.ph:                                           ; preds = %1
  %3 = getelementptr inbounds i8, ptr %0, i64 16
  %4 = load ptr, ptr %3, align 8, !tbaa !11
  %5 = getelementptr inbounds i8, ptr %0, i64 24
  %6 = getelementptr inbounds i8, ptr %4, i64 40
  br label %7

7:                                                ; preds = %.lr.ph, %11
  %.017 = phi ptr [ %2, %.lr.ph ], [ %8, %11 ]
  %8 = load ptr, ptr %.017, align 8, !tbaa !12
  %9 = load ptr, ptr %5, align 8, !tbaa !14
  %.not15 = icmp eq ptr %9, null
  br i1 %.not15, label %11, label %10

10:                                               ; preds = %7
  tail call void %9(ptr noundef nonnull %0, ptr noundef nonnull %.017) #2
  br label %11

11:                                               ; preds = %10, %7
  %12 = load ptr, ptr %6, align 8, !tbaa !15
  tail call void %12(ptr noundef nonnull %.017) #2
  %.not = icmp eq ptr %8, null
  br i1 %.not, label %._crit_edge, label %7, !llvm.loop !17

._crit_edge:                                      ; preds = %11, %1
  %13 = getelementptr inbounds i8, ptr %0, i64 32
  store i64 0, ptr %13, align 8, !tbaa !19
  tail call void @llvm.memset.p0.i64(ptr noundef nonnull align 8 dereferenceable(16) %0, i8 0, i64 16, i1 false)
  ret void
}

; Function Attrs: nocallback nofree nounwind willreturn memory(argmem: write)
declare void @llvm.memset.p0.i64(ptr nocapture writeonly, i8, i64, i1 immarg) #1

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 nounwind willreturn memory(argmem: write) }
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, !7, i64 0}
!6 = !{!"FList", !7, i64 0, !7, i64 8, !7, i64 16, !7, i64 24, !10, i64 32}
!7 = !{!"any pointer", !8, i64 0}
!8 = !{!"omnipotent char", !9, i64 0}
!9 = !{!"Simple C/C++ TBAA"}
!10 = !{!"long", !8, i64 0}
!11 = !{!6, !7, i64 16}
!12 = !{!13, !7, i64 0}
!13 = !{!"FListItem", !7, i64 0, !7, i64 8}
!14 = !{!6, !7, i64 24}
!15 = !{!16, !7, i64 40}
!16 = !{!"DsAllocator", !7, i64 0, !7, i64 8, !7, i64 16, !7, i64 24, !7, i64 32, !7, i64 40, !7, i64 48}
!17 = distinct !{!17, !18}
!18 = !{!"llvm.loop.mustprogress"}
!19 = !{!6, !10, i64 32}


; Effective O3 passes: EarlyCSEPass,GlobalOptPass,InferFunctionAttrsPass,InstCombinePass,JumpThreadingPass,LICMPass,LoopRotatePass,LoopSimplifyPass,LoopUnrollPass,MemCpyOptPass,SROAPass,SimplifyCFGPass,TailCallElimPass