; LLVM IR from MakeContributions/DSA :: algorithms/C/linked-lists (Insert-and-del-beginning-circular-ll)

; 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.node = type { i32, ptr }

@head = external dso_local global ptr, align 8
@tail = external dso_local global ptr, align 8
@.str.4 = external hidden unnamed_addr constant [41 x i8], align 1

declare i32 @printf(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
define dso_local void @deleteBeg() #2 {
  %1 = alloca ptr, align 8
  %2 = load ptr, ptr @head, align 8, !tbaa !5
  %3 = icmp eq ptr %2, null
  br i1 %3, label %4, label %6

4:                                                ; preds = %0
  %5 = call i32 (ptr, ...) @printf(ptr noundef @.str.4)
  br label %22

6:                                                ; preds = %0
  %7 = load ptr, ptr @head, align 8, !tbaa !5
  %8 = load ptr, ptr @tail, align 8, !tbaa !5
  %9 = icmp eq ptr %7, %8
  br i1 %9, label %10, label %12

10:                                               ; preds = %6
  %11 = load ptr, ptr @head, align 8, !tbaa !5
  call void @free(ptr noundef %11) #4
  store ptr null, ptr @head, align 8, !tbaa !5
  store ptr null, ptr @tail, align 8, !tbaa !5
  br label %22

12:                                               ; preds = %6
  call void @llvm.lifetime.start.p0(i64 8, ptr %1) #4
  %13 = load ptr, ptr @head, align 8, !tbaa !5
  store ptr %13, ptr %1, align 8, !tbaa !5
  %14 = load ptr, ptr @head, align 8, !tbaa !5
  %15 = getelementptr inbounds %struct.node, ptr %14, i32 0, i32 1
  %16 = load ptr, ptr %15, align 8, !tbaa !9
  store ptr %16, ptr @head, align 8, !tbaa !5
  %17 = load ptr, ptr @head, align 8, !tbaa !5
  %18 = load ptr, ptr @tail, align 8, !tbaa !5
  %19 = getelementptr inbounds %struct.node, ptr %18, i32 0, i32 1
  store ptr %17, ptr %19, align 8, !tbaa !9
  %20 = load ptr, ptr %1, align 8, !tbaa !5
  call void @free(ptr noundef %20) #4
  call void @llvm.lifetime.end.p0(i64 8, ptr %1) #4
  br label %21

21:                                               ; preds = %12
  br label %22

22:                                               ; preds = %21, %10, %4
  ret void
}

; Function Attrs: nounwind
declare void @free(ptr noundef) #3

attributes #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 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 "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 #4 = { 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 = !{!"node", !11, i64 0, !6, i64 8}
!11 = !{!"int", !7, 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"

@head = external dso_local local_unnamed_addr global ptr, align 8
@tail = external dso_local local_unnamed_addr global ptr, align 8
@.str.4 = external hidden unnamed_addr constant [41 x i8], align 1

; Function Attrs: nofree nounwind
declare noundef i32 @printf(ptr nocapture noundef readonly, ...) local_unnamed_addr #0

; Function Attrs: nounwind uwtable
define dso_local void @deleteBeg() local_unnamed_addr #1 {
  %1 = load ptr, ptr @head, align 8, !tbaa !5
  %2 = icmp eq ptr %1, null
  br i1 %2, label %3, label %5

3:                                                ; preds = %0
  %4 = tail call i32 (ptr, ...) @printf(ptr noundef nonnull dereferenceable(1) @.str.4)
  br label %13

5:                                                ; preds = %0
  %6 = load ptr, ptr @tail, align 8, !tbaa !5
  %7 = icmp eq ptr %1, %6
  br i1 %7, label %8, label %9

8:                                                ; preds = %5
  tail call void @free(ptr noundef nonnull %1) #3
  store ptr null, ptr @head, align 8, !tbaa !5
  store ptr null, ptr @tail, align 8, !tbaa !5
  br label %13

9:                                                ; preds = %5
  %10 = getelementptr inbounds i8, ptr %1, i64 8
  %11 = load ptr, ptr %10, align 8, !tbaa !9
  store ptr %11, ptr @head, align 8, !tbaa !5
  %12 = getelementptr inbounds i8, ptr %6, i64 8
  store ptr %11, ptr %12, align 8, !tbaa !9
  tail call void @free(ptr noundef nonnull %1) #3
  br label %13

13:                                               ; preds = %9, %8, %3
  ret void
}

; Function Attrs: mustprogress nounwind willreturn allockind("free") memory(argmem: readwrite, inaccessiblemem: readwrite)
declare void @free(ptr allocptr nocapture noundef) local_unnamed_addr #2

attributes #0 = { nofree nounwind "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 = { 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 = { mustprogress nounwind willreturn allockind("free") memory(argmem: readwrite, 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 #3 = { 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 = !{!"node", !11, i64 0, !6, i64 8}
!11 = !{!"int", !7, i64 0}


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