; LLVM IR from recp/ds :: src (flist_separate)

; 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.FListItem = 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: 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 ptr @flist_sp_at(ptr noundef %0, i32 noundef %1) #1 {
  %3 = alloca ptr, align 8
  %4 = alloca ptr, align 8
  %5 = alloca i32, align 4
  %6 = alloca ptr, align 8
  %7 = alloca i32, align 4
  %8 = alloca i32, align 4
  store ptr %0, ptr %4, align 8, !tbaa !5
  store i32 %1, ptr %5, align 4, !tbaa !9
  call void @llvm.lifetime.start.p0(i64 8, ptr %6) #2
  call void @llvm.lifetime.start.p0(i64 4, ptr %7) #2
  %9 = load ptr, ptr %4, align 8, !tbaa !5
  %10 = load ptr, ptr %9, align 8, !tbaa !5
  store ptr %10, ptr %6, align 8, !tbaa !5
  store i32 0, ptr %7, align 4, !tbaa !9
  br label %11

11:                                               ; preds = %24, %2
  %12 = load i32, ptr %7, align 4, !tbaa !9
  %13 = load i32, ptr %5, align 4, !tbaa !9
  %14 = icmp slt i32 %12, %13
  br i1 %14, label %15, label %18

15:                                               ; preds = %11
  %16 = load ptr, ptr %6, align 8, !tbaa !5
  %17 = icmp ne ptr %16, null
  br label %18

18:                                               ; preds = %15, %11
  %19 = phi i1 [ false, %11 ], [ %17, %15 ]
  br i1 %19, label %20, label %27

20:                                               ; preds = %18
  %21 = load ptr, ptr %6, align 8, !tbaa !5
  %22 = getelementptr inbounds %struct.FListItem, ptr %21, i32 0, i32 0
  %23 = load ptr, ptr %22, align 8, !tbaa !11
  store ptr %23, ptr %6, align 8, !tbaa !5
  br label %24

24:                                               ; preds = %20
  %25 = load i32, ptr %7, align 4, !tbaa !9
  %26 = add nsw i32 %25, 1
  store i32 %26, ptr %7, align 4, !tbaa !9
  br label %11, !llvm.loop !13

27:                                               ; preds = %18
  %28 = load ptr, ptr %6, align 8, !tbaa !5
  %29 = icmp ne ptr %28, null
  br i1 %29, label %30, label %34

30:                                               ; preds = %27
  %31 = load ptr, ptr %6, align 8, !tbaa !5
  %32 = getelementptr inbounds %struct.FListItem, ptr %31, i32 0, i32 1
  %33 = load ptr, ptr %32, align 8, !tbaa !15
  store ptr %33, ptr %3, align 8
  store i32 1, ptr %8, align 4
  br label %35

34:                                               ; preds = %27
  store ptr null, ptr %3, align 8
  store i32 1, ptr %8, align 4
  br label %35

35:                                               ; preds = %34, %30
  call void @llvm.lifetime.end.p0(i64 4, ptr %7) #2
  call void @llvm.lifetime.end.p0(i64 8, ptr %6) #2
  %36 = load ptr, ptr %3, align 8
  ret ptr %36
}

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, !10, i64 0}
!10 = !{!"int", !7, i64 0}
!11 = !{!12, !6, i64 0}
!12 = !{!"FListItem", !6, i64 0, !6, i64 8}
!13 = distinct !{!13, !14}
!14 = !{!"llvm.loop.mustprogress"}
!15 = !{!12, !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: nofree norecurse nosync nounwind memory(read, inaccessiblemem: none) uwtable
define dso_local ptr @flist_sp_at(ptr nocapture noundef readonly %0, i32 noundef %1) local_unnamed_addr #0 {
  br label %3

3:                                                ; preds = %3, %2
  %.08.in = phi ptr [ %0, %2 ], [ %.08, %3 ]
  %.0 = phi i32 [ 0, %2 ], [ %7, %3 ]
  %.08 = load ptr, ptr %.08.in, align 8, !tbaa !5
  %4 = icmp slt i32 %.0, %1
  %5 = icmp ne ptr %.08, null
  %6 = select i1 %4, i1 %5, i1 false
  %7 = add nuw nsw i32 %.0, 1
  br i1 %6, label %3, label %8, !llvm.loop !9

8:                                                ; preds = %3
  br i1 %5, label %9, label %12

9:                                                ; preds = %8
  %10 = getelementptr inbounds i8, ptr %.08, i64 8
  %11 = load ptr, ptr %10, align 8, !tbaa !11
  br label %12

12:                                               ; preds = %8, %9
  %.09 = phi ptr [ %11, %9 ], [ null, %8 ]
  ret ptr %.09
}

attributes #0 = { nofree norecurse nosync nounwind memory(read, inaccessiblemem: none) 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, !6, i64 0}
!6 = !{!"any pointer", !7, i64 0}
!7 = !{!"omnipotent char", !8, i64 0}
!8 = !{!"Simple C/C++ TBAA"}
!9 = distinct !{!9, !10}
!10 = !{!"llvm.loop.mustprogress"}
!11 = !{!12, !6, i64 8}
!12 = !{!"FListItem", !6, i64 0, !6, i64 8}


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