; LLVM IR from TyrantLucifer/DataStructure :: LinearList (LoopDoubleLinkList)

; 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, 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 i32 @delete(ptr noundef %0, i32 noundef %1) #1 {
  %3 = alloca i32, align 4
  %4 = alloca ptr, align 8
  %5 = alloca i32, align 4
  %6 = alloca ptr, align 8
  %7 = 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) #3
  %8 = load ptr, ptr %4, align 8, !tbaa !5
  %9 = getelementptr inbounds %struct.Node, ptr %8, i32 0, i32 2
  %10 = load ptr, ptr %9, align 8, !tbaa !11
  store ptr %10, ptr %6, align 8, !tbaa !5
  br label %11

11:                                               ; preds = %41, %2
  %12 = load ptr, ptr %6, align 8, !tbaa !5
  %13 = load ptr, ptr %4, align 8, !tbaa !5
  %14 = icmp ne ptr %12, %13
  br i1 %14, label %15, label %45

15:                                               ; preds = %11
  %16 = load ptr, ptr %6, align 8, !tbaa !5
  %17 = getelementptr inbounds %struct.Node, ptr %16, i32 0, i32 0
  %18 = load i32, ptr %17, align 8, !tbaa !13
  %19 = load i32, ptr %5, align 4, !tbaa !9
  %20 = icmp eq i32 %18, %19
  br i1 %20, label %21, label %41

21:                                               ; preds = %15
  %22 = load ptr, ptr %6, align 8, !tbaa !5
  %23 = getelementptr inbounds %struct.Node, ptr %22, i32 0, i32 2
  %24 = load ptr, ptr %23, align 8, !tbaa !11
  %25 = load ptr, ptr %6, align 8, !tbaa !5
  %26 = getelementptr inbounds %struct.Node, ptr %25, i32 0, i32 1
  %27 = load ptr, ptr %26, align 8, !tbaa !14
  %28 = getelementptr inbounds %struct.Node, ptr %27, i32 0, i32 2
  store ptr %24, ptr %28, align 8, !tbaa !11
  %29 = load ptr, ptr %6, align 8, !tbaa !5
  %30 = getelementptr inbounds %struct.Node, ptr %29, i32 0, i32 1
  %31 = load ptr, ptr %30, align 8, !tbaa !14
  %32 = load ptr, ptr %6, align 8, !tbaa !5
  %33 = getelementptr inbounds %struct.Node, ptr %32, i32 0, i32 2
  %34 = load ptr, ptr %33, align 8, !tbaa !11
  %35 = getelementptr inbounds %struct.Node, ptr %34, i32 0, i32 1
  store ptr %31, ptr %35, align 8, !tbaa !14
  %36 = load ptr, ptr %6, align 8, !tbaa !5
  call void @free(ptr noundef %36) #3
  %37 = load ptr, ptr %4, align 8, !tbaa !5
  %38 = getelementptr inbounds %struct.Node, ptr %37, i32 0, i32 0
  %39 = load i32, ptr %38, align 8, !tbaa !13
  %40 = add nsw i32 %39, -1
  store i32 %40, ptr %38, align 8, !tbaa !13
  store i32 1, ptr %3, align 4
  store i32 1, ptr %7, align 4
  br label %46

41:                                               ; preds = %15
  %42 = load ptr, ptr %6, align 8, !tbaa !5
  %43 = getelementptr inbounds %struct.Node, ptr %42, i32 0, i32 2
  %44 = load ptr, ptr %43, align 8, !tbaa !11
  store ptr %44, ptr %6, align 8, !tbaa !5
  br label %11, !llvm.loop !15

45:                                               ; preds = %11
  store i32 0, ptr %3, align 4
  store i32 1, ptr %7, align 4
  br label %46

46:                                               ; preds = %45, %21
  call void @llvm.lifetime.end.p0(i64 8, ptr %6) #3
  %47 = load i32, ptr %3, align 4
  ret i32 %47
}

; Function Attrs: nounwind
declare void @free(ptr noundef) #2

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


; 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 range(i32 0, 2) i32 @delete(ptr noundef %0, i32 noundef %1) local_unnamed_addr #0 {
  br label %3

3:                                                ; preds = %4, %2
  %.pn = phi ptr [ %0, %2 ], [ %.0, %4 ]
  %.0.in = getelementptr inbounds i8, ptr %.pn, i64 16
  %.0 = load ptr, ptr %.0.in, align 8, !tbaa !5
  %.not = icmp eq ptr %.0, %0
  br i1 %.not, label %.loopexit, label %4

4:                                                ; preds = %3
  %5 = load i32, ptr %.0, align 8, !tbaa !11
  %6 = icmp eq i32 %5, %1
  br i1 %6, label %7, label %3, !llvm.loop !12

7:                                                ; preds = %4
  %8 = getelementptr inbounds i8, ptr %.0, i64 16
  %9 = load ptr, ptr %8, align 8, !tbaa !5
  %10 = getelementptr inbounds i8, ptr %.0, i64 8
  %11 = load ptr, ptr %10, align 8, !tbaa !14
  %12 = getelementptr inbounds i8, ptr %11, i64 16
  store ptr %9, ptr %12, align 8, !tbaa !5
  %13 = getelementptr inbounds i8, ptr %9, i64 8
  store ptr %11, ptr %13, align 8, !tbaa !14
  tail call void @free(ptr noundef nonnull %.0) #2
  %14 = load i32, ptr %0, align 8, !tbaa !11
  %15 = add nsw i32 %14, -1
  store i32 %15, ptr %0, align 8, !tbaa !11
  br label %.loopexit

.loopexit:                                        ; preds = %3, %7
  %.012 = phi i32 [ 1, %7 ], [ 0, %3 ]
  ret i32 %.012
}

; Function Attrs: mustprogress nounwind willreturn allockind("free") memory(argmem: readwrite, inaccessiblemem: readwrite)
declare void @free(ptr allocptr nocapture noundef) local_unnamed_addr #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 = { 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 #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, !10, i64 16}
!6 = !{!"Node", !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 = !{!6, !7, i64 0}
!12 = distinct !{!12, !13}
!13 = !{!"llvm.loop.mustprogress"}
!14 = !{!6, !10, i64 8}


; Effective O3 passes: CorrelatedValuePropagationPass,EarlyCSEPass,GVNPass,GlobalOptPass,IPSCCPPass,InferFunctionAttrsPass,InstCombinePass,InstSimplifyPass,JumpThreadingPass,LCSSAPass,LoopSimplifyPass,LoopUnrollPass,SROAPass,SimplifyCFGPass,TailCallElimPass