; LLVM IR from sunkafei/xcpc-algorithm-templates :: 算法/数据结构/TopTree.ll (Z6findfaP4node)

; 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 <{ [4 x ptr], ptr, %struct.info, %struct.info, %struct.info, %struct.info, %struct.mark, %struct.mark, i8, i8, [6 x i8] }>
%struct.info = type { i32, i32, i32, i32 }
%struct.mark = type { i32, i32 }

@null = external dso_local global ptr, align 8

; Function Attrs: mustprogress uwtable
declare dso_local void @_ZN4node4downEv(ptr noundef nonnull align 8 dereferenceable(122)) #0 align 2

; Function Attrs: mustprogress uwtable
declare dso_local void @_Z5splayP4nodei(ptr noundef, i32 noundef) #0

; Function Attrs: mustprogress uwtable
declare dso_local void @_Z5touchP4node(ptr noundef) #0

; Function Attrs: mustprogress uwtable
define dso_local noundef ptr @_Z6findfaP4node(ptr noundef %0) #0 {
  %2 = alloca ptr, align 8
  %3 = alloca ptr, align 8
  store ptr %0, ptr %3, align 8, !tbaa !5
  %4 = load ptr, ptr %3, align 8, !tbaa !5
  call void @_Z5touchP4node(ptr noundef %4)
  %5 = load ptr, ptr %3, align 8, !tbaa !5
  %6 = getelementptr inbounds %struct.node, ptr %5, i32 0, i32 0
  %7 = getelementptr inbounds [4 x ptr], ptr %6, i64 0, i64 0
  %8 = load ptr, ptr %7, align 8, !tbaa !5
  store ptr %8, ptr %3, align 8, !tbaa !5
  %9 = load ptr, ptr %3, align 8, !tbaa !5
  %10 = load ptr, ptr @null, align 8, !tbaa !5
  %11 = icmp eq ptr %9, %10
  br i1 %11, label %12, label %13

12:                                               ; preds = %1
  store ptr null, ptr %2, align 8
  br label %30

13:                                               ; preds = %1
  br label %14

14:                                               ; preds = %21, %13
  %15 = load ptr, ptr %3, align 8, !tbaa !5
  %16 = getelementptr inbounds %struct.node, ptr %15, i32 0, i32 0
  %17 = getelementptr inbounds [4 x ptr], ptr %16, i64 0, i64 1
  %18 = load ptr, ptr %17, align 8, !tbaa !5
  %19 = load ptr, ptr @null, align 8, !tbaa !5
  %20 = icmp ne ptr %18, %19
  br i1 %20, label %21, label %27

21:                                               ; preds = %14
  %22 = load ptr, ptr %3, align 8, !tbaa !5
  call void @_ZN4node4downEv(ptr noundef nonnull align 8 dereferenceable(122) %22)
  %23 = load ptr, ptr %3, align 8, !tbaa !5
  %24 = getelementptr inbounds %struct.node, ptr %23, i32 0, i32 0
  %25 = getelementptr inbounds [4 x ptr], ptr %24, i64 0, i64 1
  %26 = load ptr, ptr %25, align 8, !tbaa !5
  store ptr %26, ptr %3, align 8, !tbaa !5
  br label %14, !llvm.loop !9

27:                                               ; preds = %14
  %28 = load ptr, ptr %3, align 8, !tbaa !5
  call void @_Z5splayP4nodei(ptr noundef %28, i32 noundef 0)
  %29 = load ptr, ptr %3, align 8, !tbaa !5
  store ptr %29, ptr %2, align 8
  br label %30

30:                                               ; preds = %27, %12
  %31 = load ptr, ptr %2, align 8
  ret ptr %31
}

attributes #0 = { mustprogress 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 = distinct !{!9, !10}
!10 = !{!"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"

@null = external dso_local local_unnamed_addr global ptr, align 8

; Function Attrs: mustprogress uwtable
declare dso_local void @_ZN4node4downEv(ptr noundef nonnull align 8 dereferenceable(122)) local_unnamed_addr #0 align 2

; Function Attrs: mustprogress uwtable
declare dso_local void @_Z5splayP4nodei(ptr noundef, i32 noundef) local_unnamed_addr #0

; Function Attrs: mustprogress uwtable
declare dso_local void @_Z5touchP4node(ptr noundef) local_unnamed_addr #0

; Function Attrs: mustprogress uwtable
define dso_local noundef ptr @_Z6findfaP4node(ptr noundef %0) local_unnamed_addr #0 {
  tail call void @_Z5touchP4node(ptr noundef %0)
  %2 = load ptr, ptr %0, align 8, !tbaa !5
  %3 = load ptr, ptr @null, align 8, !tbaa !5
  %4 = icmp eq ptr %2, %3
  br i1 %4, label %12, label %.preheader

.preheader:                                       ; preds = %1
  %5 = getelementptr inbounds i8, ptr %2, i64 8
  %6 = load ptr, ptr %5, align 8, !tbaa !5
  %.not11 = icmp eq ptr %6, %3
  br i1 %.not11, label %._crit_edge, label %.lr.ph

.lr.ph:                                           ; preds = %.preheader, %.lr.ph
  %7 = phi ptr [ %9, %.lr.ph ], [ %5, %.preheader ]
  %.012 = phi ptr [ %8, %.lr.ph ], [ %2, %.preheader ]
  tail call void @_ZN4node4downEv(ptr noundef nonnull align 8 dereferenceable(122) %.012)
  %8 = load ptr, ptr %7, align 8, !tbaa !5
  %9 = getelementptr inbounds i8, ptr %8, i64 8
  %10 = load ptr, ptr %9, align 8, !tbaa !5
  %11 = load ptr, ptr @null, align 8, !tbaa !5
  %.not = icmp eq ptr %10, %11
  br i1 %.not, label %._crit_edge, label %.lr.ph, !llvm.loop !9

._crit_edge:                                      ; preds = %.lr.ph, %.preheader
  %.0.lcssa = phi ptr [ %2, %.preheader ], [ %8, %.lr.ph ]
  tail call void @_Z5splayP4nodei(ptr noundef nonnull %.0.lcssa, i32 noundef 0)
  br label %12

12:                                               ; preds = %1, %._crit_edge
  %.09 = phi ptr [ %.0.lcssa, %._crit_edge ], [ null, %1 ]
  ret ptr %.09
}

attributes #0 = { mustprogress 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 = distinct !{!9, !10}
!10 = !{!"llvm.loop.mustprogress"}


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