; LLVM IR from sunkafei/xcpc-algorithm-templates :: 算法/数据结构/link-cut-tree（维护子树）.ll (Z6accessP4node)

; 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 { ptr, [2 x ptr], i32, i32, i32 }

@nil = external dso_local global ptr, align 8

; Function Attrs: mustprogress nounwind uwtable
declare dso_local void @_Z6pushupP4node(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: mustprogress nounwind uwtable
declare dso_local void @_Z5splayP4node(ptr noundef) #0

; Function Attrs: mustprogress nounwind uwtable
define dso_local noundef ptr @_Z6accessP4node(ptr noundef %0) #0 {
  %2 = alloca ptr, align 8
  %3 = alloca ptr, align 8
  store ptr %0, ptr %2, align 8, !tbaa !5
  call void @llvm.lifetime.start.p0(i64 8, ptr %3) #2
  %4 = load ptr, ptr @nil, align 8, !tbaa !5
  store ptr %4, ptr %3, align 8, !tbaa !5
  br label %5

5:                                                ; preds = %9, %1
  %6 = load ptr, ptr %2, align 8, !tbaa !5
  %7 = load ptr, ptr @nil, align 8, !tbaa !5
  %8 = icmp ne ptr %6, %7
  br i1 %8, label %9, label %37

9:                                                ; preds = %5
  %10 = load ptr, ptr %2, align 8, !tbaa !5
  call void @_Z5splayP4node(ptr noundef %10)
  %11 = load ptr, ptr %2, align 8, !tbaa !5
  %12 = getelementptr inbounds %struct.node, ptr %11, i32 0, i32 1
  %13 = getelementptr inbounds [2 x ptr], ptr %12, i64 0, i64 1
  %14 = load ptr, ptr %13, align 8, !tbaa !5
  %15 = getelementptr inbounds %struct.node, ptr %14, i32 0, i32 3
  %16 = load i32, ptr %15, align 4, !tbaa !9
  %17 = load ptr, ptr %3, align 8, !tbaa !5
  %18 = getelementptr inbounds %struct.node, ptr %17, i32 0, i32 3
  %19 = load i32, ptr %18, align 4, !tbaa !9
  %20 = sub nsw i32 %16, %19
  %21 = load ptr, ptr %2, align 8, !tbaa !5
  %22 = getelementptr inbounds %struct.node, ptr %21, i32 0, i32 4
  %23 = load i32, ptr %22, align 8, !tbaa !12
  %24 = add nsw i32 %23, %20
  store i32 %24, ptr %22, align 8, !tbaa !12
  %25 = load ptr, ptr %2, align 8, !tbaa !5
  %26 = load ptr, ptr %3, align 8, !tbaa !5
  %27 = getelementptr inbounds %struct.node, ptr %26, i32 0, i32 0
  store ptr %25, ptr %27, align 8, !tbaa !13
  %28 = load ptr, ptr %3, align 8, !tbaa !5
  %29 = load ptr, ptr %2, align 8, !tbaa !5
  %30 = getelementptr inbounds %struct.node, ptr %29, i32 0, i32 1
  %31 = getelementptr inbounds [2 x ptr], ptr %30, i64 0, i64 1
  store ptr %28, ptr %31, align 8, !tbaa !5
  %32 = load ptr, ptr %2, align 8, !tbaa !5
  call void @_Z6pushupP4node(ptr noundef %32)
  %33 = load ptr, ptr %2, align 8, !tbaa !5
  store ptr %33, ptr %3, align 8, !tbaa !5
  %34 = load ptr, ptr %2, align 8, !tbaa !5
  %35 = getelementptr inbounds %struct.node, ptr %34, i32 0, i32 0
  %36 = load ptr, ptr %35, align 8, !tbaa !13
  store ptr %36, ptr %2, align 8, !tbaa !5
  br label %5, !llvm.loop !14

37:                                               ; preds = %5
  %38 = load ptr, ptr %3, align 8, !tbaa !5
  call void @llvm.lifetime.end.p0(i64 8, ptr %3) #2
  ret ptr %38
}

attributes #0 = { mustprogress 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 = { nocallback nofree nosync nounwind willreturn memory(argmem: readwrite) }
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++ TBAA"}
!9 = !{!10, !11, i64 28}
!10 = !{!"_ZTS4node", !6, i64 0, !7, i64 8, !11, i64 24, !11, i64 28, !11, i64 32}
!11 = !{!"int", !7, i64 0}
!12 = !{!10, !11, i64 32}
!13 = !{!10, !6, i64 0}
!14 = distinct !{!14, !15}
!15 = !{!"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"

@nil = external dso_local local_unnamed_addr global ptr, align 8

; Function Attrs: mustprogress nounwind uwtable
declare dso_local void @_Z6pushupP4node(ptr noundef) local_unnamed_addr #0

; Function Attrs: mustprogress nounwind uwtable
declare dso_local void @_Z5splayP4node(ptr noundef) local_unnamed_addr #0

; Function Attrs: mustprogress nounwind uwtable
define dso_local noundef ptr @_Z6accessP4node(ptr noundef %0) local_unnamed_addr #0 {
  %2 = load ptr, ptr @nil, align 8, !tbaa !5
  %.not14 = icmp eq ptr %2, %0
  br i1 %.not14, label %._crit_edge, label %.lr.ph

.lr.ph:                                           ; preds = %1, %.lr.ph
  %.016 = phi ptr [ %.01315, %.lr.ph ], [ %2, %1 ]
  %.01315 = phi ptr [ %13, %.lr.ph ], [ %0, %1 ]
  tail call void @_Z5splayP4node(ptr noundef %.01315)
  %3 = getelementptr inbounds i8, ptr %.01315, i64 16
  %4 = load ptr, ptr %3, align 8, !tbaa !5
  %5 = getelementptr inbounds i8, ptr %4, i64 28
  %6 = load i32, ptr %5, align 4, !tbaa !9
  %7 = getelementptr inbounds i8, ptr %.016, i64 28
  %8 = load i32, ptr %7, align 4, !tbaa !9
  %9 = sub i32 %6, %8
  %10 = getelementptr inbounds i8, ptr %.01315, i64 32
  %11 = load i32, ptr %10, align 8, !tbaa !12
  %12 = add nsw i32 %9, %11
  store i32 %12, ptr %10, align 8, !tbaa !12
  store ptr %.01315, ptr %.016, align 8, !tbaa !13
  store ptr %.016, ptr %3, align 8, !tbaa !5
  tail call void @_Z6pushupP4node(ptr noundef %.01315)
  %13 = load ptr, ptr %.01315, align 8, !tbaa !13
  %14 = load ptr, ptr @nil, align 8, !tbaa !5
  %.not = icmp eq ptr %13, %14
  br i1 %.not, label %._crit_edge, label %.lr.ph, !llvm.loop !14

._crit_edge:                                      ; preds = %.lr.ph, %1
  %.0.lcssa = phi ptr [ %2, %1 ], [ %.01315, %.lr.ph ]
  ret ptr %.0.lcssa
}

attributes #0 = { mustprogress 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, !6, i64 0}
!6 = !{!"any pointer", !7, i64 0}
!7 = !{!"omnipotent char", !8, i64 0}
!8 = !{!"Simple C++ TBAA"}
!9 = !{!10, !11, i64 28}
!10 = !{!"_ZTS4node", !6, i64 0, !7, i64 8, !11, i64 24, !11, i64 28, !11, i64 32}
!11 = !{!"int", !7, i64 0}
!12 = !{!10, !11, i64 32}
!13 = !{!10, !6, i64 0}
!14 = distinct !{!14, !15}
!15 = !{!"llvm.loop.mustprogress"}


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