; LLVM IR from JessonYue/LeetCodeLearning :: Array/wuchao/linkedlist/8-1 双向链表 (LinkedList)

; 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.LinkedList = type { ptr, ptr }
%struct.Node = type { ptr, ptr, i32 }

; 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
declare dso_local void @linkNodeToHead(ptr noundef, ptr noundef) #1

; Function Attrs: nounwind uwtable
define dso_local void @moveToHead(ptr noundef %0, i32 noundef %1) #1 {
  %3 = alloca ptr, align 8
  %4 = alloca i32, align 4
  %5 = alloca ptr, align 8
  store ptr %0, ptr %3, align 8, !tbaa !5
  store i32 %1, ptr %4, align 4, !tbaa !9
  call void @llvm.lifetime.start.p0(i64 8, ptr %5) #2
  %6 = load ptr, ptr %3, align 8, !tbaa !5
  %7 = getelementptr inbounds %struct.LinkedList, ptr %6, i32 0, i32 0
  %8 = load ptr, ptr %7, align 8, !tbaa !11
  %9 = getelementptr inbounds %struct.Node, ptr %8, i32 0, i32 1
  %10 = load ptr, ptr %9, align 8, !tbaa !13
  store ptr %10, ptr %5, align 8, !tbaa !5
  br label %11

11:                                               ; preds = %40, %2
  %12 = load ptr, ptr %5, align 8, !tbaa !5
  %13 = load ptr, ptr %3, align 8, !tbaa !5
  %14 = getelementptr inbounds %struct.LinkedList, ptr %13, i32 0, i32 1
  %15 = load ptr, ptr %14, align 8, !tbaa !15
  %16 = icmp ne ptr %12, %15
  br i1 %16, label %17, label %41

17:                                               ; preds = %11
  %18 = load ptr, ptr %5, align 8, !tbaa !5
  %19 = getelementptr inbounds %struct.Node, ptr %18, i32 0, i32 2
  %20 = load i32, ptr %19, align 8, !tbaa !16
  %21 = load i32, ptr %4, align 4, !tbaa !9
  %22 = icmp eq i32 %20, %21
  br i1 %22, label %23, label %40

23:                                               ; preds = %17
  %24 = load ptr, ptr %5, align 8, !tbaa !5
  %25 = getelementptr inbounds %struct.Node, ptr %24, i32 0, i32 1
  %26 = load ptr, ptr %25, align 8, !tbaa !13
  %27 = load ptr, ptr %5, align 8, !tbaa !5
  %28 = getelementptr inbounds %struct.Node, ptr %27, i32 0, i32 0
  %29 = load ptr, ptr %28, align 8, !tbaa !17
  %30 = getelementptr inbounds %struct.Node, ptr %29, i32 0, i32 1
  store ptr %26, ptr %30, align 8, !tbaa !13
  %31 = load ptr, ptr %5, align 8, !tbaa !5
  %32 = getelementptr inbounds %struct.Node, ptr %31, i32 0, i32 0
  %33 = load ptr, ptr %32, align 8, !tbaa !17
  %34 = load ptr, ptr %5, align 8, !tbaa !5
  %35 = getelementptr inbounds %struct.Node, ptr %34, i32 0, i32 1
  %36 = load ptr, ptr %35, align 8, !tbaa !13
  %37 = getelementptr inbounds %struct.Node, ptr %36, i32 0, i32 0
  store ptr %33, ptr %37, align 8, !tbaa !17
  %38 = load ptr, ptr %3, align 8, !tbaa !5
  %39 = load ptr, ptr %5, align 8, !tbaa !5
  call void @linkNodeToHead(ptr noundef %38, ptr noundef %39)
  br label %41

40:                                               ; preds = %17
  br label %11, !llvm.loop !18

41:                                               ; preds = %23, %11
  call void @llvm.lifetime.end.p0(i64 8, ptr %5) #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, !10, i64 0}
!10 = !{!"int", !7, i64 0}
!11 = !{!12, !6, i64 0}
!12 = !{!"LinkedList", !6, i64 0, !6, i64 8}
!13 = !{!14, !6, i64 8}
!14 = !{!"Node", !6, i64 0, !6, i64 8, !10, i64 16}
!15 = !{!12, !6, i64 8}
!16 = !{!14, !10, i64 16}
!17 = !{!14, !6, i64 0}
!18 = distinct !{!18, !19}
!19 = !{!"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
declare dso_local void @linkNodeToHead(ptr noundef, ptr noundef) local_unnamed_addr #0

; Function Attrs: nounwind uwtable
define dso_local void @moveToHead(ptr noundef %0, i32 noundef %1) local_unnamed_addr #0 {
  %3 = load ptr, ptr %0, align 8, !tbaa !5
  %4 = getelementptr inbounds i8, ptr %3, i64 8
  %5 = load ptr, ptr %4, align 8, !tbaa !10
  %6 = getelementptr inbounds i8, ptr %0, i64 8
  %7 = load ptr, ptr %6, align 8, !tbaa !13
  %.not = icmp eq ptr %5, %7
  br i1 %.not, label %.loopexit, label %.split

.split:                                           ; preds = %2
  %8 = getelementptr inbounds i8, ptr %5, i64 16
  %9 = load i32, ptr %8, align 8, !tbaa !14
  %10 = icmp eq i32 %9, %1
  br i1 %10, label %11, label %.split.split, !llvm.loop !15

.split.split:                                     ; preds = %.split, %.split.split
  br label %.split.split

11:                                               ; preds = %.split
  %12 = getelementptr inbounds i8, ptr %5, i64 8
  %13 = load ptr, ptr %12, align 8, !tbaa !10
  %14 = load ptr, ptr %5, align 8, !tbaa !17
  %15 = getelementptr inbounds i8, ptr %14, i64 8
  store ptr %13, ptr %15, align 8, !tbaa !10
  store ptr %14, ptr %13, align 8, !tbaa !17
  tail call void @linkNodeToHead(ptr noundef nonnull %0, ptr noundef nonnull %5)
  br label %.loopexit

.loopexit:                                        ; preds = %2, %11
  ret void
}

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" }

!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 = !{!"LinkedList", !7, i64 0, !7, i64 8}
!7 = !{!"any pointer", !8, i64 0}
!8 = !{!"omnipotent char", !9, i64 0}
!9 = !{!"Simple C/C++ TBAA"}
!10 = !{!11, !7, i64 8}
!11 = !{!"Node", !7, i64 0, !7, i64 8, !12, i64 16}
!12 = !{!"int", !8, i64 0}
!13 = !{!6, !7, i64 8}
!14 = !{!11, !12, i64 16}
!15 = distinct !{!15, !16}
!16 = !{!"llvm.loop.mustprogress"}
!17 = !{!11, !7, i64 0}


; Effective O3 passes: EarlyCSEPass,GVNPass,GlobalOptPass,InferFunctionAttrsPass,InstCombinePass,LICMPass,LoopSimplifyCFGPass,LoopSimplifyPass,LoopUnrollPass,SROAPass,SimplifyCFGPass,TailCallElimPass