; LLVM IR from zhemao/libds :: list (list_iterator)

; 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.list = type { i32, ptr, ptr, ptr }
%struct.list_iter = type { ptr, i8 }

; Function Attrs: nocallback nofree nosync nounwind willreturn memory(argmem: readwrite)
declare void @llvm.lifetime.start.p0(i64 immarg, ptr nocapture) #0

; Function Attrs: nounwind allocsize(0)
declare noalias ptr @malloc(i64 noundef) #1

; 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 @list_iterator(ptr noundef %0, i8 noundef signext %1) #2 {
  %3 = alloca ptr, align 8
  %4 = alloca ptr, align 8
  %5 = alloca i8, align 1
  %6 = alloca ptr, align 8
  %7 = alloca i32, align 4
  store ptr %0, ptr %4, align 8, !tbaa !5
  store i8 %1, ptr %5, align 1, !tbaa !9
  call void @llvm.lifetime.start.p0(i64 8, ptr %6) #3
  %8 = call noalias ptr @malloc(i64 noundef 16) #4
  store ptr %8, ptr %6, align 8, !tbaa !5
  %9 = load i8, ptr %5, align 1, !tbaa !9
  %10 = sext i8 %9 to i32
  %11 = icmp eq i32 %10, 0
  br i1 %11, label %12, label %18

12:                                               ; preds = %2
  %13 = load ptr, ptr %4, align 8, !tbaa !5
  %14 = getelementptr inbounds %struct.list, ptr %13, i32 0, i32 1
  %15 = load ptr, ptr %14, align 8, !tbaa !10
  %16 = load ptr, ptr %6, align 8, !tbaa !5
  %17 = getelementptr inbounds %struct.list_iter, ptr %16, i32 0, i32 0
  store ptr %15, ptr %17, align 8, !tbaa !13
  br label %30

18:                                               ; preds = %2
  %19 = load i8, ptr %5, align 1, !tbaa !9
  %20 = sext i8 %19 to i32
  %21 = icmp eq i32 %20, 1
  br i1 %21, label %22, label %28

22:                                               ; preds = %18
  %23 = load ptr, ptr %4, align 8, !tbaa !5
  %24 = getelementptr inbounds %struct.list, ptr %23, i32 0, i32 2
  %25 = load ptr, ptr %24, align 8, !tbaa !15
  %26 = load ptr, ptr %6, align 8, !tbaa !5
  %27 = getelementptr inbounds %struct.list_iter, ptr %26, i32 0, i32 0
  store ptr %25, ptr %27, align 8, !tbaa !13
  br label %29

28:                                               ; preds = %18
  store ptr null, ptr %3, align 8
  store i32 1, ptr %7, align 4
  br label %34

29:                                               ; preds = %22
  br label %30

30:                                               ; preds = %29, %12
  %31 = load ptr, ptr %6, align 8, !tbaa !5
  %32 = getelementptr inbounds %struct.list_iter, ptr %31, i32 0, i32 1
  store i8 0, ptr %32, align 8, !tbaa !16
  %33 = load ptr, ptr %6, align 8, !tbaa !5
  store ptr %33, ptr %3, align 8
  store i32 1, ptr %7, align 4
  br label %34

34:                                               ; preds = %30, %28
  call void @llvm.lifetime.end.p0(i64 8, ptr %6) #3
  %35 = load ptr, ptr %3, align 8
  ret ptr %35
}

attributes #0 = { nocallback nofree nosync nounwind willreturn memory(argmem: readwrite) }
attributes #1 = { nounwind allocsize(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 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 #3 = { nounwind }
attributes #4 = { nounwind allocsize(0) }

!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 = !{!7, !7, i64 0}
!10 = !{!11, !6, i64 8}
!11 = !{!"list", !12, i64 0, !6, i64 8, !6, i64 16, !6, i64 24}
!12 = !{!"int", !7, i64 0}
!13 = !{!14, !6, i64 0}
!14 = !{!"list_iter", !6, i64 0, !7, i64 8}
!15 = !{!11, !6, i64 16}
!16 = !{!14, !7, 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: mustprogress nofree nounwind willreturn allockind("alloc,uninitialized") allocsize(0) memory(inaccessiblemem: readwrite)
declare noalias noundef ptr @malloc(i64 noundef) local_unnamed_addr #0

; Function Attrs: mustprogress nofree nounwind willreturn memory(write, argmem: read, inaccessiblemem: readwrite) uwtable
define dso_local noalias noundef ptr @list_iterator(ptr nocapture noundef readonly %0, i8 noundef signext %1) local_unnamed_addr #1 {
  %3 = tail call noalias dereferenceable_or_null(16) ptr @malloc(i64 noundef 16) #2
  switch i8 %1, label %8 [
    i8 0, label %5
    i8 1, label %4
  ]

4:                                                ; preds = %2
  br label %5

5:                                                ; preds = %2, %4
  %.sink = phi i64 [ 16, %4 ], [ 8, %2 ]
  %6 = getelementptr inbounds i8, ptr %0, i64 %.sink
  %storemerge = load ptr, ptr %6, align 8, !tbaa !5
  store ptr %storemerge, ptr %3, align 8, !tbaa !9
  %7 = getelementptr inbounds i8, ptr %3, i64 8
  store i8 0, ptr %7, align 8, !tbaa !11
  br label %8

8:                                                ; preds = %2, %5
  %.0 = phi ptr [ %3, %5 ], [ null, %2 ]
  ret ptr %.0
}

attributes #0 = { mustprogress nofree nounwind willreturn allockind("alloc,uninitialized") allocsize(0) memory(inaccessiblemem: readwrite) "alloc-family"="malloc" "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 = { mustprogress nofree nounwind willreturn memory(write, argmem: read, inaccessiblemem: readwrite) 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 allocsize(0) }

!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 0}
!10 = !{!"list_iter", !6, i64 0, !7, i64 8}
!11 = !{!10, !7, i64 8}


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